Bassam G . N . Muthanna (original) (raw)

Papers by Bassam G . N . Muthanna

Procedia structural integrity, 2018

During their operation, modern aircraft engine components are subjected to increasingly demanding... more During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.

Failure Assessment Diagram (FAD) is constraint modified using the assumption that the constraint ... more Failure Assessment Diagram (FAD) is constraint modified using the assumption that the constraint T stress is proportional to the non-dimensional loading. The constraint modified FAD has been used to compute safety factors associated elliptic defects. Ključne reči • FAD • T napon • greške u cevima • stepen sigurnosti

Engineering Failure Analysis, 2019

Abstract The severe damage of gas turbine is due to the failure of the blade, in which the occurr... more Abstract The severe damage of gas turbine is due to the failure of the blade, in which the occurrence of a serious pitting occurred on the blade surfaces was evidence of fatigue marks in the fracture surface. This paper deals with the effect of semi-elliptical crack propagation on the crack path using a basic approach in predicting crack paths, namely, incremental methods. The crack position was chosen at the node coordinate where we have the maximum principal stresses. In this node, we have created a semi-elliptical crack and we have compared the results with the Stress Intensity Factors and T-stress values. The local fracture criterion of the maximum average tangential stress in the vicinity of fracture process zone including two terms of the Williams series solution for the mixed mode I/II loading has been used for predicting the angle of surface crack growth. The volumetric method (VM) for the compression-sensitive materials is described by a linear combination of the effective stress and the effective stress intensity factor. The results of our finite element computations based on a two-parameter fracture mechanics formulation showed that the T-stress has significant effects on the crack path.

International Journal of Hydrogen Energy, 2018

Hydrogen plays a decisive role in many future energy systems. For these reasons, many researchers... more Hydrogen plays a decisive role in many future energy systems. For these reasons, many researchers have been performed to see the effect of hydrogen on network canalizations. This paper was study the possibility of hydrogen transportation using the natural gas pipeline. In this paper, the effect of hydrogen embrittlement (HE) on the mechanical properties of pipe steels was examined. It appeared that the yield stress and ultimate strength were few sensitive to HE. However, fracture toughness and elongation at failure exhibited a severe decrease. Failure pressure established by different codes involved a flow stress which is a combination of yield stress and flow stress. Pipe defect assessment involved fracture toughness and flow stress upon using Failure Assessment Diagram (FAD) or Crack Driving Force (CDF) methods. In this paper, the consequence of hydrogen embrittlement on the failure and critical pressures of a pipe with a semi-elliptical defect was examined. The influence of assessment method, relative defect depth and working pressure were examined through the comparison of respective safety factors.

Engineering Failure Analysis, 2019

Due to the worldwide decrease in the quantity of potable water in the last decade, the desalinati... more Due to the worldwide decrease in the quantity of potable water in the last decade, the desalination station is among one of the most important methods to treat seawater to supply the dry regions, Sahara regions and the offshore regions with purified water. During the desalination process, many problems can appear including the corrosion problems that attribute to the materials of piping systems and theirs geometrical shapes, and the chemical composition of water taking into account the conditions of transporting. Pipe elbow is one of the necessary parts to build the integrated piping system which is considered as a linking point between different parts of the transport systems. Because of its effective role and complex forms that based mainly on welding processes, the pipe elbow is vulnerable to corrosion problems considering the liquid nature of the effluent, and the surrounding pressure and temperature. The results of the mechanical characterizations tests such as metallurgical examinations using optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF) allowed us to analyze the main causes of the defect in this part. The obtained results showed that many technical solutions can be employed to mitigate and relief the encountered internal corrosion in pipe elbow, which helps greatly in enhancing the energy development in desalination industry. 1. Introduction A long time ago, water wealth played a major role in the emergence of many civilizations and wars between human nations. Recently, the water crisis has become a serious issue due to the aspect of shortage and increasing demand of fresh water and other aspect is the shortage resulted from thermal emissions and water pollution activities. For these reasons, many countries decided to adopt the seawater desalination methodology as a solution to the water-shortage problem. The solid-fluid interaction in the components of the desalination industry leads to chemical reactions in the elbow part which represents the critical zone in the piping systems. The transport of corrosive liquids (simple or complexes) can be achieved using difference ways such as pipeline, pipeline offshore, cargo tanks for chemical tankers, storage tank, road tankers, rail tank wagons and many other solutions. The processes of water treatment and its transport depend on the piping systems especially the elbow who is one of among an important parts. Indeed,

Cellulose Chemistry and Technology, Mar 15, 2024

Journal of Petroleum Science and Engineering, 2021

Abstract During the crude oil refining process, the piping system suffers a lot of corrosion dama... more Abstract During the crude oil refining process, the piping system suffers a lot of corrosion damage at the elbows due to complex chemical reactions. This work aimed to investigate the effects of sodium chloride (NaCl), calcium chloride (CaCl2), naphthenic acids, and sulfur compounds, which can be responsible for corrosion in oil refineries due to the rheological and physical properties of crude oils. The corrosion occurs by a cracking operation that depends on the solid–fluid interaction, the temperature, and the crude oil nature. Computational fluid dynamics (CFD) has been used to predict the corrosion behavior based on the velocity profiles, shear stress, the friction factor, and the solid deposition rate of iron(II) chloride (FeCl2), iron(II) acetate (Fe(CH3COO)2), and iron sulfide (FeS) along the elbow. The numerical results proved that the corrosion locations are focused at certain regions, especially the elbow extrados wall outlet. The numerical results provide more solutions to avoid corrosion and improve the operational safety of the refinery.

International Journal of Pressure Vessels and Piping, 2021

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Engineering Failure Analysis, 2019

Journal of Bio- and Tribo-Corrosion, 2018

A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe wa... more A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe was designed to transport dry gas. The failure had taken place in 6 o'clock position at the stage discharge of the flow process. Specimens from the failed part had taken for laboratory investigation in order to find out the cause of the pipe rupture. Visual and metallographic observations confirmed that the pipe split was due to a crack initiated in circumferential and then turned into longitudinal direction. Sever wall thickness reduction was noticed on the internal pipe surface. SEM observations at the fracture surface revealed features of ductile fracture mode. Corrosion product analysis showed the traces of iron carbonate/iron sulphate. Upon the laboratory analysis, the concluded remarks confirmed that the pipe failed due to the effect of wet fluid (condensate) caused severe wall thickness dissolution resulted in pipe could not stand the continuation at in-service working condition.

Frattura ed Integrità Strutturale, 2019

Pipelines are considered as a major tool to transport hydrocarbons due to its important role in t... more Pipelines are considered as a major tool to transport hydrocarbons due to its important role in transporting fluids taking into account the operating conditions. Despite the importance of the elbow which considered as a critical part in the pipelines, the repeated failures and defects became a dangerous and enormously costly issue. In this numerical study, the Fluid-Structure Interaction (FSI) analysis was carried out using Ansys software. This work is divided into four main parts: the first part focused on studying and comparing the effect of bending radius of pipe elbow on the maximum of Von-Mises stress values for each radius with the yield stress of the steel of the pipe. The second part focused on the creation of a semielliptical crack for different locations along the elbow angles to show the critical position compared to the stress intensity factors. In the third part, the

Journal of Bio-and Tribo-Corrosion, 2018

A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe wa... more A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe was designed to transport dry gas. The failure had taken place in 6 o'clock position at the stage discharge of the flow process. Specimens from the failed part had taken for laboratory investigation in order to find out the cause of the pipe rupture. Visual and metallographic observations confirmed that the pipe split was due to a crack initiated in circumferential and then turned into longitudinal direction. Sever wall thickness reduction was noticed on the internal pipe surface. SEM observations at the fracture surface revealed features of ductile fracture mode. Corrosion product analysis showed the traces of iron carbonate/iron sulphate. Upon the laboratory analysis, the concluded remarks confirmed that the pipe failed due to the effect of wet fluid (condensate) caused severe wall thickness dissolution resulted in pipe could not stand the continuation at in-service working condition.

Engineering Failure Analysis, 2019

Puffiness formation can occur during process of pipelines component fabrication and transportatio... more Puffiness formation can occur during process of pipelines component fabrication and transportation or during construction, operation, maintenance and their repair processes. The present paper addresses issues related to pipeline design and associated with the unintended actions due to external loads or ground movements. These may introduce longitudinal strains in the pipeline owing to combinations of curvatures and axial forces. Such scenarios can be tackled with Strain-Based Design approaches. Elaboration on checking the strain capacity of pipelines was achieved via the material testing in which a full-scale test was performed on a pressurized pipe under bending load. Numerical modeling procedures for predicting the structural behavior using certain assumptions are also described in this study. The result in local buckling hereafter referred to as puffiness. Such local damages are associated with large plastic deformations, substantial changes of the pipeline geometry and mechanical properties of its material.

Frattura ed Integrità Strutturale, 2019

Pipelines are considered as a major tool to transport hydrocarbons due to its important role in t... more Pipelines are considered as a major tool to transport hydrocarbons due to its important role in transporting fluids taking into account the operating conditions. Despite the importance of the elbow which considered as a critical part in the pipelines, the repeated failures and defects became a dangerous and enormously costly issue. In this numerical study, the Fluid-Structure Interaction (FSI) analysis was carried out using Ansys software. This work is divided into four main parts: the first part focused on studying and comparing the effect of bending radius of pipe elbow on the maximum of Von-Mises stress values for each radius with the yield stress of the steel of the pipe. The second part focused on the creation of a semi-elliptical crack for different locations along the elbow angles to show the critical position compared to the stress intensity factors. In the third part, the semi-elliptical crack angle orientation was studied at the critical position to estimate the critical angle. In the last part, the failure assessment diagram (FAD) was used to show the critical crack depth ratios at a critical position and a critical angle.

Procedia structural integrity, 2018

During their operation, modern aircraft engine components are subjected to increasingly demanding... more During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.

Failure Assessment Diagram (FAD) is constraint modified using the assumption that the constraint ... more Failure Assessment Diagram (FAD) is constraint modified using the assumption that the constraint T stress is proportional to the non-dimensional loading. The constraint modified FAD has been used to compute safety factors associated elliptic defects. Ključne reči • FAD • T napon • greške u cevima • stepen sigurnosti

Engineering Failure Analysis, 2019

Abstract The severe damage of gas turbine is due to the failure of the blade, in which the occurr... more Abstract The severe damage of gas turbine is due to the failure of the blade, in which the occurrence of a serious pitting occurred on the blade surfaces was evidence of fatigue marks in the fracture surface. This paper deals with the effect of semi-elliptical crack propagation on the crack path using a basic approach in predicting crack paths, namely, incremental methods. The crack position was chosen at the node coordinate where we have the maximum principal stresses. In this node, we have created a semi-elliptical crack and we have compared the results with the Stress Intensity Factors and T-stress values. The local fracture criterion of the maximum average tangential stress in the vicinity of fracture process zone including two terms of the Williams series solution for the mixed mode I/II loading has been used for predicting the angle of surface crack growth. The volumetric method (VM) for the compression-sensitive materials is described by a linear combination of the effective stress and the effective stress intensity factor. The results of our finite element computations based on a two-parameter fracture mechanics formulation showed that the T-stress has significant effects on the crack path.

International Journal of Hydrogen Energy, 2018

Hydrogen plays a decisive role in many future energy systems. For these reasons, many researchers... more Hydrogen plays a decisive role in many future energy systems. For these reasons, many researchers have been performed to see the effect of hydrogen on network canalizations. This paper was study the possibility of hydrogen transportation using the natural gas pipeline. In this paper, the effect of hydrogen embrittlement (HE) on the mechanical properties of pipe steels was examined. It appeared that the yield stress and ultimate strength were few sensitive to HE. However, fracture toughness and elongation at failure exhibited a severe decrease. Failure pressure established by different codes involved a flow stress which is a combination of yield stress and flow stress. Pipe defect assessment involved fracture toughness and flow stress upon using Failure Assessment Diagram (FAD) or Crack Driving Force (CDF) methods. In this paper, the consequence of hydrogen embrittlement on the failure and critical pressures of a pipe with a semi-elliptical defect was examined. The influence of assessment method, relative defect depth and working pressure were examined through the comparison of respective safety factors.

Engineering Failure Analysis, 2019

Due to the worldwide decrease in the quantity of potable water in the last decade, the desalinati... more Due to the worldwide decrease in the quantity of potable water in the last decade, the desalination station is among one of the most important methods to treat seawater to supply the dry regions, Sahara regions and the offshore regions with purified water. During the desalination process, many problems can appear including the corrosion problems that attribute to the materials of piping systems and theirs geometrical shapes, and the chemical composition of water taking into account the conditions of transporting. Pipe elbow is one of the necessary parts to build the integrated piping system which is considered as a linking point between different parts of the transport systems. Because of its effective role and complex forms that based mainly on welding processes, the pipe elbow is vulnerable to corrosion problems considering the liquid nature of the effluent, and the surrounding pressure and temperature. The results of the mechanical characterizations tests such as metallurgical examinations using optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF) allowed us to analyze the main causes of the defect in this part. The obtained results showed that many technical solutions can be employed to mitigate and relief the encountered internal corrosion in pipe elbow, which helps greatly in enhancing the energy development in desalination industry. 1. Introduction A long time ago, water wealth played a major role in the emergence of many civilizations and wars between human nations. Recently, the water crisis has become a serious issue due to the aspect of shortage and increasing demand of fresh water and other aspect is the shortage resulted from thermal emissions and water pollution activities. For these reasons, many countries decided to adopt the seawater desalination methodology as a solution to the water-shortage problem. The solid-fluid interaction in the components of the desalination industry leads to chemical reactions in the elbow part which represents the critical zone in the piping systems. The transport of corrosive liquids (simple or complexes) can be achieved using difference ways such as pipeline, pipeline offshore, cargo tanks for chemical tankers, storage tank, road tankers, rail tank wagons and many other solutions. The processes of water treatment and its transport depend on the piping systems especially the elbow who is one of among an important parts. Indeed,

Cellulose Chemistry and Technology, Mar 15, 2024

Journal of Petroleum Science and Engineering, 2021

Abstract During the crude oil refining process, the piping system suffers a lot of corrosion dama... more Abstract During the crude oil refining process, the piping system suffers a lot of corrosion damage at the elbows due to complex chemical reactions. This work aimed to investigate the effects of sodium chloride (NaCl), calcium chloride (CaCl2), naphthenic acids, and sulfur compounds, which can be responsible for corrosion in oil refineries due to the rheological and physical properties of crude oils. The corrosion occurs by a cracking operation that depends on the solid–fluid interaction, the temperature, and the crude oil nature. Computational fluid dynamics (CFD) has been used to predict the corrosion behavior based on the velocity profiles, shear stress, the friction factor, and the solid deposition rate of iron(II) chloride (FeCl2), iron(II) acetate (Fe(CH3COO)2), and iron sulfide (FeS) along the elbow. The numerical results proved that the corrosion locations are focused at certain regions, especially the elbow extrados wall outlet. The numerical results provide more solutions to avoid corrosion and improve the operational safety of the refinery.

International Journal of Pressure Vessels and Piping, 2021

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Engineering Failure Analysis, 2019

Journal of Bio- and Tribo-Corrosion, 2018

A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe wa... more A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe was designed to transport dry gas. The failure had taken place in 6 o'clock position at the stage discharge of the flow process. Specimens from the failed part had taken for laboratory investigation in order to find out the cause of the pipe rupture. Visual and metallographic observations confirmed that the pipe split was due to a crack initiated in circumferential and then turned into longitudinal direction. Sever wall thickness reduction was noticed on the internal pipe surface. SEM observations at the fracture surface revealed features of ductile fracture mode. Corrosion product analysis showed the traces of iron carbonate/iron sulphate. Upon the laboratory analysis, the concluded remarks confirmed that the pipe failed due to the effect of wet fluid (condensate) caused severe wall thickness dissolution resulted in pipe could not stand the continuation at in-service working condition.

Frattura ed Integrità Strutturale, 2019

Pipelines are considered as a major tool to transport hydrocarbons due to its important role in t... more Pipelines are considered as a major tool to transport hydrocarbons due to its important role in transporting fluids taking into account the operating conditions. Despite the importance of the elbow which considered as a critical part in the pipelines, the repeated failures and defects became a dangerous and enormously costly issue. In this numerical study, the Fluid-Structure Interaction (FSI) analysis was carried out using Ansys software. This work is divided into four main parts: the first part focused on studying and comparing the effect of bending radius of pipe elbow on the maximum of Von-Mises stress values for each radius with the yield stress of the steel of the pipe. The second part focused on the creation of a semielliptical crack for different locations along the elbow angles to show the critical position compared to the stress intensity factors. In the third part, the

Journal of Bio-and Tribo-Corrosion, 2018

A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe wa... more A sudden leak of 6-inch gas line pipe after being in service for 1 year was observed. The pipe was designed to transport dry gas. The failure had taken place in 6 o'clock position at the stage discharge of the flow process. Specimens from the failed part had taken for laboratory investigation in order to find out the cause of the pipe rupture. Visual and metallographic observations confirmed that the pipe split was due to a crack initiated in circumferential and then turned into longitudinal direction. Sever wall thickness reduction was noticed on the internal pipe surface. SEM observations at the fracture surface revealed features of ductile fracture mode. Corrosion product analysis showed the traces of iron carbonate/iron sulphate. Upon the laboratory analysis, the concluded remarks confirmed that the pipe failed due to the effect of wet fluid (condensate) caused severe wall thickness dissolution resulted in pipe could not stand the continuation at in-service working condition.

Engineering Failure Analysis, 2019

Puffiness formation can occur during process of pipelines component fabrication and transportatio... more Puffiness formation can occur during process of pipelines component fabrication and transportation or during construction, operation, maintenance and their repair processes. The present paper addresses issues related to pipeline design and associated with the unintended actions due to external loads or ground movements. These may introduce longitudinal strains in the pipeline owing to combinations of curvatures and axial forces. Such scenarios can be tackled with Strain-Based Design approaches. Elaboration on checking the strain capacity of pipelines was achieved via the material testing in which a full-scale test was performed on a pressurized pipe under bending load. Numerical modeling procedures for predicting the structural behavior using certain assumptions are also described in this study. The result in local buckling hereafter referred to as puffiness. Such local damages are associated with large plastic deformations, substantial changes of the pipeline geometry and mechanical properties of its material.

Frattura ed Integrità Strutturale, 2019

Pipelines are considered as a major tool to transport hydrocarbons due to its important role in t... more Pipelines are considered as a major tool to transport hydrocarbons due to its important role in transporting fluids taking into account the operating conditions. Despite the importance of the elbow which considered as a critical part in the pipelines, the repeated failures and defects became a dangerous and enormously costly issue. In this numerical study, the Fluid-Structure Interaction (FSI) analysis was carried out using Ansys software. This work is divided into four main parts: the first part focused on studying and comparing the effect of bending radius of pipe elbow on the maximum of Von-Mises stress values for each radius with the yield stress of the steel of the pipe. The second part focused on the creation of a semi-elliptical crack for different locations along the elbow angles to show the critical position compared to the stress intensity factors. In the third part, the semi-elliptical crack angle orientation was studied at the critical position to estimate the critical angle. In the last part, the failure assessment diagram (FAD) was used to show the critical crack depth ratios at a critical position and a critical angle.