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Papers by Mohamed BELHAMIANI

Research paper thumbnail of The analysis of real estate industry credit system and evaluation system

Research paper thumbnail of Analysis of the polypropylene mechanical behaviour response: Experiments and numerical modeling

Materials & Design, 2009

The security requirements in the industrial world incite an ever deeper understanding of the beha... more The security requirements in the industrial world incite an ever deeper understanding of the behaviour and the fracture of polymeric materials used as structural parts of the passenger compartment. We are looking at a polypropylene commonly used in this field in order to identify the physical processes responsible for their mechanical properties. The mechanical characterization of the response of the polymer under simple and complex strain relies on a unique method of combining performing numerical analysis techniques. The behaviour of polypropylene with large deformations dissipative involves several processes. Its consequences on the mechanical properties of materials are significant. The analysis of these results to emphasis that the plasticity of the polymer involves addition mechanical properties. Taken together, these observations can lay the groundwork for a thermodynamic modeling of the behaviour law to this class of polymer. The contribution of this approach was demonstrated by experimental and numerical modeling of the polypropylene mechanical behaviour.

Research paper thumbnail of Elastoplastic analysis of cracked Aluminum plates with a hybrid repair technique using the bonded composite patch and drilling hole in opening mode I

The objective of this study is to analyze the performance of composite bonding repair, hole drill... more The objective of this study is to analyze the performance of composite bonding repair, hole drilling and the combination of the two techniques (hybrid repairs) by tensile tests and to show the interest of a hybrid repair versus to other processes. These repair techniques can apply in different branches of engineering: mechanical, aerospace, civil, naval, etc. The finite element method with the ABAQUS code was used to model the mechanical behavior of the different repair techniques. The Notch Stress Intensity Factor (NSIF) is adopted to model the behavior of the cracked notch based on the volumetric method. The size of the plastic zone, the intensity of the normal σyy stress, the peel stress and CTOD are combined to model the proposed technics repairs. Although the bonded composite is very strong, the application of a drilling hole results in additional energy absorption and reduces the level of the maximum normal stress by about 50% compared to a simple patch only. The use of a hybr...

Research paper thumbnail of J integral computation and Limit load analysis of bonded composite repair in cracked pipes under pressure

Frattura ed Integrità Strutturale

In this paper an additional criterion was introduced to evaluate the composite repair systems usi... more In this paper an additional criterion was introduced to evaluate the composite repair systems using the limit load analysis. The plastic collapse pressure of API 5L X65 PSL2 steel pressure vessel structure with crack defect is numerically investigated after the structure was been repaired by composite overwrap. The objective of this study was the analysis of the efficiency of composite repair systems using this additional criterion to gain more confidence on it taking into account, the cracks and the overwrap geometries. The material of the pipe is elastic perfectly plastic for the plastic collapse pressure criterion and elastic-plastic using the Romberg Osgood model for fracture mechanic criterion. The additional criterion allows us to compare the uncracked and cracked pipe to estimate the repair efficiency. Moreover, the composite overwrap could restore 90% of the plastic collapse pressure for cracked pipes.

Research paper thumbnail of Numerical Analysis of Polymeric Thin Films Fracture Based on Energetic Approach "The Essential Work of Fracture

Periodica Polytechnica Mechanical Engineering, Nov 4, 2019

Actually, polymeric materials are widely used in industry due to their attractive properties. The... more Actually, polymeric materials are widely used in industry due to their attractive properties. These materials are replacing the traditional materials used to manufacture mechanical components. Thus, their mechanical behavior should be known for a better and judicious use of the material. Fracture mechanics principles and tools are used to characterize polymeric thin films fracture. In this paper a global energetic approach proposed to characterize the rupture phenomenon and determine the essential work of fracture.

Research paper thumbnail of Fracture Toughness Characterization of High-Density Polyethylene Using Essential Work of Fracture Concept

Journal of Failure Analysis and Prevention

Research paper thumbnail of Stress intensity factors analyses for external semi-elliptical crack for repaired gas-pipeline by composite overwrap under pressure

Frattura ed Integrità Strutturale

The purpose of this article is to present the stress intensity factors (SIF) solutions for semi-e... more The purpose of this article is to present the stress intensity factors (SIF) solutions for semi-elliptic crack in pipelines under internal pressures, the stress intensity factors are calculated by the three-dimensional finite element method (FEM) for cracked pipelines and repaired pipe by composite patch. The distribution of normalized stress intensity factors (KI, KII and KIII) along the crack front for different crack lengths, crack depth, crack geometry, lap length and composite thickness was obtained by nodal calculations. Our results show the presence of three failure modes along the semi elliptical crack front and has three zones in which the stress intensity factor in mixed mode (KII) the higher-values comparing to KI and KIII. It can also be noted that the composite repair reduces the SIF KI by 46% and the KII by 55% and the KIII by 72% near the outside diameter of the pipe in each zone. However, the reduction of the SIF K I is more significant for the rectangular crack than for the semi-elliptic crack, from which it is concluded that the composite repair is very effective for a rectangular crack with respect to the semi-elliptic crack. Thereby, the fracture behavior of the semi-elliptic crack is governed by the three modes of failure and not only by mode I.

Research paper thumbnail of The analysis of real estate industry credit system and evaluation system

Research paper thumbnail of Analysis of the polypropylene mechanical behaviour response: Experiments and numerical modeling

Materials & Design, 2009

The security requirements in the industrial world incite an ever deeper understanding of the beha... more The security requirements in the industrial world incite an ever deeper understanding of the behaviour and the fracture of polymeric materials used as structural parts of the passenger compartment. We are looking at a polypropylene commonly used in this field in order to identify the physical processes responsible for their mechanical properties. The mechanical characterization of the response of the polymer under simple and complex strain relies on a unique method of combining performing numerical analysis techniques. The behaviour of polypropylene with large deformations dissipative involves several processes. Its consequences on the mechanical properties of materials are significant. The analysis of these results to emphasis that the plasticity of the polymer involves addition mechanical properties. Taken together, these observations can lay the groundwork for a thermodynamic modeling of the behaviour law to this class of polymer. The contribution of this approach was demonstrated by experimental and numerical modeling of the polypropylene mechanical behaviour.

Research paper thumbnail of Elastoplastic analysis of cracked Aluminum plates with a hybrid repair technique using the bonded composite patch and drilling hole in opening mode I

The objective of this study is to analyze the performance of composite bonding repair, hole drill... more The objective of this study is to analyze the performance of composite bonding repair, hole drilling and the combination of the two techniques (hybrid repairs) by tensile tests and to show the interest of a hybrid repair versus to other processes. These repair techniques can apply in different branches of engineering: mechanical, aerospace, civil, naval, etc. The finite element method with the ABAQUS code was used to model the mechanical behavior of the different repair techniques. The Notch Stress Intensity Factor (NSIF) is adopted to model the behavior of the cracked notch based on the volumetric method. The size of the plastic zone, the intensity of the normal σyy stress, the peel stress and CTOD are combined to model the proposed technics repairs. Although the bonded composite is very strong, the application of a drilling hole results in additional energy absorption and reduces the level of the maximum normal stress by about 50% compared to a simple patch only. The use of a hybr...

Research paper thumbnail of J integral computation and Limit load analysis of bonded composite repair in cracked pipes under pressure

Frattura ed Integrità Strutturale

In this paper an additional criterion was introduced to evaluate the composite repair systems usi... more In this paper an additional criterion was introduced to evaluate the composite repair systems using the limit load analysis. The plastic collapse pressure of API 5L X65 PSL2 steel pressure vessel structure with crack defect is numerically investigated after the structure was been repaired by composite overwrap. The objective of this study was the analysis of the efficiency of composite repair systems using this additional criterion to gain more confidence on it taking into account, the cracks and the overwrap geometries. The material of the pipe is elastic perfectly plastic for the plastic collapse pressure criterion and elastic-plastic using the Romberg Osgood model for fracture mechanic criterion. The additional criterion allows us to compare the uncracked and cracked pipe to estimate the repair efficiency. Moreover, the composite overwrap could restore 90% of the plastic collapse pressure for cracked pipes.

Research paper thumbnail of Numerical Analysis of Polymeric Thin Films Fracture Based on Energetic Approach "The Essential Work of Fracture

Periodica Polytechnica Mechanical Engineering, Nov 4, 2019

Actually, polymeric materials are widely used in industry due to their attractive properties. The... more Actually, polymeric materials are widely used in industry due to their attractive properties. These materials are replacing the traditional materials used to manufacture mechanical components. Thus, their mechanical behavior should be known for a better and judicious use of the material. Fracture mechanics principles and tools are used to characterize polymeric thin films fracture. In this paper a global energetic approach proposed to characterize the rupture phenomenon and determine the essential work of fracture.

Research paper thumbnail of Fracture Toughness Characterization of High-Density Polyethylene Using Essential Work of Fracture Concept

Journal of Failure Analysis and Prevention

Research paper thumbnail of Stress intensity factors analyses for external semi-elliptical crack for repaired gas-pipeline by composite overwrap under pressure

Frattura ed Integrità Strutturale

The purpose of this article is to present the stress intensity factors (SIF) solutions for semi-e... more The purpose of this article is to present the stress intensity factors (SIF) solutions for semi-elliptic crack in pipelines under internal pressures, the stress intensity factors are calculated by the three-dimensional finite element method (FEM) for cracked pipelines and repaired pipe by composite patch. The distribution of normalized stress intensity factors (KI, KII and KIII) along the crack front for different crack lengths, crack depth, crack geometry, lap length and composite thickness was obtained by nodal calculations. Our results show the presence of three failure modes along the semi elliptical crack front and has three zones in which the stress intensity factor in mixed mode (KII) the higher-values comparing to KI and KIII. It can also be noted that the composite repair reduces the SIF KI by 46% and the KII by 55% and the KIII by 72% near the outside diameter of the pipe in each zone. However, the reduction of the SIF K I is more significant for the rectangular crack than for the semi-elliptic crack, from which it is concluded that the composite repair is very effective for a rectangular crack with respect to the semi-elliptic crack. Thereby, the fracture behavior of the semi-elliptic crack is governed by the three modes of failure and not only by mode I.