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Papers by Abu Hena Muntakim

Research paper thumbnail of Finite element simulation of the effect of loading rate on the stress-strain behaviour of Albany sand

Journal of the National Science Foundation of Sri Lanka, 2016

Research paper thumbnail of Acoustic noise characterization for leak detection in water mains

Acoustic emission (AE) method is becoming popular for leak detection in municipal water mains whe... more Acoustic emission (AE) method is becoming popular for leak detection in municipal water mains where leaks are identified and the locations are determined through interpretation of measured acoustic signals without any excavation or disruption of services. For the interpretation of signals, several parameters such as frequency band of signals, coherence between signals, and cross-correlation between signals are employed. However, published literature lack data on applicability of the AE method under various field conditions. This research presents field investigation of leak detection using AE method, identification of leak noise source, leak noise attenuation characteristics and finite element (FE) simulation of acoustic wave propagation through fluid filled pipe. The field application of the AE method was performed through measuring acoustic noise at two points bracketing the leak along the pipe length in the City of Mount Pearl in Newfoundland and Labrador, Canada. For a better un...

Research paper thumbnail of Numerical Assessment of Dented Pipe Using Inline Inspection Data

The current finite element (FE) assessment methods of dented pipes are based on specific dent pro... more The current finite element (FE) assessment methods of dented pipes are based on specific dent profiles, which are generally created based on the shape of indenters. However, the actual dent profile in real case scenarios is mostly irregular in shape, depending on the cause of damage. In this paper, FE analyses of dented pipes using inline inspection (ILI) data are presented. Based on the ILI data, the dent profile is generated by applying the nodal displacements to all the pipe nodes. The validation of this nodal displacement approach is discussed in this paper. Besides, a parametric study is carried out to study the behavior of dent for different dent depth, pipe geometry, and pipe grades. The significance of residual stresses generated during the dent formation on the behavior of dented pipe during the service life is also discussed. Finally, the remaining life estimation of dented pipes according to the API 579-1 is presented using FE analysis results.

Research paper thumbnail of Full-scale Laboratory Pullout Testing of a 60 mm Diameter Buried MDPE Pipes

Buried pipelines are extensively used for transporting oil, gas and water in Canada and worldwide... more Buried pipelines are extensively used for transporting oil, gas and water in Canada and worldwide, since pipelines are considered as the most convenient and economical means of transporting liquid and gas. The pipelines often cross active landslide areas, which are subjected to additional loads due to ground movements. Assessment of the effects of ground movements on the performance of the pipeline is, therefore, an important consideration for pipeline integrity assessment. The existing pipe design methods for the assessment of the performance of pipelines crossing active landslide area recommend using a simplified method to calculate maximum pullout force due to axial landslide without proper consideration of soil-pipe interaction. Researchers employed analytical and numerical modelling approaches to explain the soil-pipe interaction during relative ground movements. However, the assumptions used in the analytical and numerical models require validation with experimental evidence. In this research, a new full-scale pipe test facility has been developed to investigate the behaviour of flexible mediumdensity polyethylene (MDPE) pipes subjected to movements relative to the backfill soil. Pullout tests of 60 mm diameter MDPE pipes are performed using the test facility. The study reveals that the pullout behaviour of the pipe significantly depends on the viscoelastic response of the pipe material. Pipe strains developed almost linearly from the leading end to the tailing end when the shear strength is fully mobilized over the entire pipe length. Research findings demonstrate the need for considering the time-dependent effects of pipe materials in describing the soil-pipeline interaction during the axial pullout.

Research paper thumbnail of Numerical Assessment of Dented Pipe Using Inline Inspection Data

Volume 1: Pipeline and Facilities Integrity, 2020

The current finite element (FE) assessment methods of dented pipes are based on specific dent pro... more The current finite element (FE) assessment methods of dented pipes are based on specific dent profiles, which are generally created based on the shape of indenters. However, the actual dent profile in real case scenarios is mostly irregular in shape, depending on the cause of damage. In this paper, FE analyses of dented pipes using inline inspection (ILI) data are presented. Based on the ILI data, the dent profile is generated by applying the nodal displacements to all the pipe nodes. The validation of this nodal displacement approach is discussed in this paper. Besides, a parametric study is carried out to study the behavior of dent for different dent depth, pipe geometry, and pipe grades. The significance of residual stresses generated during the dent formation on the behavior of dented pipe during the service life is also discussed. Finally, the remaining life estimation of dented pipes according to the API 579-1 is presented using FE analysis results.

Research paper thumbnail of Behavior of a branched buried MDPE gas distribution pipe under axial ground movement

Medium density polyethylene pipes (MDPE) are widely used for gas distribution systems in Canada a... more Medium density polyethylene pipes (MDPE) are widely used for gas distribution systems in Canada and worldwide. These pipes are often exposed to relative ground movements resulting from landslides and earthquakes. The effects of the relative ground movement on the pipes are influenced by the presence of lateral branches and the tee-joint connecting the branch. Only a limited study is currently available in the literature on studying the behavior of branched pipe subjected to ground movements. This paper presents an experimental investigation of a branched MDPE pipe subjected to axial ground movement. A test with a 60.3 mm diameter gas distribution pipe is conducted using the laboratory facility at Memorial University of Newfoundland. Pipe wall strains and soil pressures around the pipe are measured to capture the mechanism of soil-pipe interaction. Test results reveal that the pullout force and pipe wall strains are significantly influenced by the tee-joint. The elongation of the fle...

Research paper thumbnail of Modelling Time Dependent Behavior of Buried Polyethylene Pipes Using Abaqus

Buried polyethylene pipes are increasingly used for their various advantages over the metal pipes... more Buried polyethylene pipes are increasingly used for their various advantages over the metal pipes including light-weights, ease of installation and corrosion resistance. The polymer pipe material possesses time-dependent behavior that influence the pipe-soil interaction over time. The current industry practice to account for the time-dependent effect is to use secant modulii to calculate the short-term and long-term responses. A short-term and a long-term modulus of the pipe materials are used to calculate the pipe responses independently. This method is unable to predict the continuous time -depended pipe-soil interaction and the resulting pipe responses over time. To address this limitation, researchers are working toward developing time dependent material models for the pipe materials to conduct pipe-soil interaction analysis. A number of different visco-elastic and visco-plastic models were developed for polymer materials over the last few decades. However, these models are not ...

Research paper thumbnail of Assessment of Axial Pullout Force for Buried Medium-Density Polyethylene Pipelines

Journal of Pipeline Systems Engineering and Practice, 2021

AbstractThe maximum axial force on a pipeline subjected to axial ground movement is commonly calc... more AbstractThe maximum axial force on a pipeline subjected to axial ground movement is commonly calculated using a design equation developed without proper consideration of soil-pipe interaction. The ...

Research paper thumbnail of Interpretation of Acoustic Field Data for Leak Detection in Ductile Iron and Copper Water-Distribution Pipes

Journal of Pipeline Systems Engineering and Practice, 2017

AbstractThe acoustic emission (AE) method is becoming popular for detecting leaks in municipal wa... more AbstractThe acoustic emission (AE) method is becoming popular for detecting leaks in municipal water mains where leaks are identified and the locations are determined through the interpretation of ...

Research paper thumbnail of Nonlinear Analysis of Axisymmetrically Wrinkled Pipes Under Axial Loads and Internal Pressures

Volume 5A: Pipeline and Riser Technology, 2015

ABSTRACT

Research paper thumbnail of Application of Variational Theory: Vehicle Trajectory Reconstruction Fusing Video Sensor and Probe Data for Non-Lane Based Heterogeneous Condition NOTE: this record was deleted from TRID at the request of James Bryant, Technical Activities Division, due to copyright infringement

Transportation Research Board 95th Annual MeetingTransportation Research Board, 2016

Research paper thumbnail of Variational Formulation Incorporating Spatial Capacity Changes to Reconstruct Trajectory for Heterogeneous Traffic Condition

Canadian Journal of Civil Engineering, 2017

This study deals with the reconstruction of vehicle trajectories incorporating a data fusion fram... more This study deals with the reconstruction of vehicle trajectories incorporating a data fusion framework that combines video and probe sensor data in heterogeneous traffic conditions. The framework is based on the application of variational formulation (VF) of kinematic waves for multiple lane conditions. The VF requires cumulative count and reference trajectory as boundary conditions. The VF also requires generation of lopsided network using fundamental diagram (FD) parameters. In this regard, cumulative count and FD parameters are obtained from the video sensor, while reference vehicle trajectory is obtained from the probe sensor. The analysis shows that the framework can provide an accuracy of 83% in trajectory estimation from the nearest reference trajectory. However, the accuracy decreases as the reference trajectory gets farther away from the estimated one. Additionally, an extension of the VF to accommodate roadway side friction is presented. The FD as well as lopsided network ...

Research paper thumbnail of Application of Variational Theory: Vehicle Trajectory Reconstruction Fusing Video Sensor and Probe Data for Non-Lane Based Heterogeneous Condition

Research paper thumbnail of Nonlinear finite element analysis of dented pipes under internal pressure and axial loads

Proceedings of the 13th International Conference on Mechanical Engineering (ICME2019), 2021

The mechanical damages created on buried pipelines by any external activities are important consi... more The mechanical damages created on buried pipelines by any external activities are important consideration to assess the structural integrity of pipelines. The damages could be in the form of corrosion, dent, crack, gouge or any combination of these. A dent is a permanent inward plastic deformation in the pipe wall. The dents may not immediately cause failure of the pipe. However, it can reduce the pipe’s structural capacity and cause rupture or leak in the long run. The current researches focus on studying the behavior of dented pipe with respect to burst strength and fatigue life considering initial deformed shape. However, the effects of residual stresses formed during the formation of a dent on the performance of dented pipe are not extensively studied yet. In this study, finite-element modelling is used to understand the importance of residual stresses on the integrity assessment of dented pipe. The analysis results revealed that both residual stresses and stress history have significant effects on the structural capacity of dented pipes under internal pressure and axial loads.

Research paper thumbnail of Finite element simulation of the effect of loading rate on the stress-strain behaviour of Albany sand

Journal of the National Science Foundation of Sri Lanka, 2016

Research paper thumbnail of Acoustic noise characterization for leak detection in water mains

Acoustic emission (AE) method is becoming popular for leak detection in municipal water mains whe... more Acoustic emission (AE) method is becoming popular for leak detection in municipal water mains where leaks are identified and the locations are determined through interpretation of measured acoustic signals without any excavation or disruption of services. For the interpretation of signals, several parameters such as frequency band of signals, coherence between signals, and cross-correlation between signals are employed. However, published literature lack data on applicability of the AE method under various field conditions. This research presents field investigation of leak detection using AE method, identification of leak noise source, leak noise attenuation characteristics and finite element (FE) simulation of acoustic wave propagation through fluid filled pipe. The field application of the AE method was performed through measuring acoustic noise at two points bracketing the leak along the pipe length in the City of Mount Pearl in Newfoundland and Labrador, Canada. For a better un...

Research paper thumbnail of Numerical Assessment of Dented Pipe Using Inline Inspection Data

The current finite element (FE) assessment methods of dented pipes are based on specific dent pro... more The current finite element (FE) assessment methods of dented pipes are based on specific dent profiles, which are generally created based on the shape of indenters. However, the actual dent profile in real case scenarios is mostly irregular in shape, depending on the cause of damage. In this paper, FE analyses of dented pipes using inline inspection (ILI) data are presented. Based on the ILI data, the dent profile is generated by applying the nodal displacements to all the pipe nodes. The validation of this nodal displacement approach is discussed in this paper. Besides, a parametric study is carried out to study the behavior of dent for different dent depth, pipe geometry, and pipe grades. The significance of residual stresses generated during the dent formation on the behavior of dented pipe during the service life is also discussed. Finally, the remaining life estimation of dented pipes according to the API 579-1 is presented using FE analysis results.

Research paper thumbnail of Full-scale Laboratory Pullout Testing of a 60 mm Diameter Buried MDPE Pipes

Buried pipelines are extensively used for transporting oil, gas and water in Canada and worldwide... more Buried pipelines are extensively used for transporting oil, gas and water in Canada and worldwide, since pipelines are considered as the most convenient and economical means of transporting liquid and gas. The pipelines often cross active landslide areas, which are subjected to additional loads due to ground movements. Assessment of the effects of ground movements on the performance of the pipeline is, therefore, an important consideration for pipeline integrity assessment. The existing pipe design methods for the assessment of the performance of pipelines crossing active landslide area recommend using a simplified method to calculate maximum pullout force due to axial landslide without proper consideration of soil-pipe interaction. Researchers employed analytical and numerical modelling approaches to explain the soil-pipe interaction during relative ground movements. However, the assumptions used in the analytical and numerical models require validation with experimental evidence. In this research, a new full-scale pipe test facility has been developed to investigate the behaviour of flexible mediumdensity polyethylene (MDPE) pipes subjected to movements relative to the backfill soil. Pullout tests of 60 mm diameter MDPE pipes are performed using the test facility. The study reveals that the pullout behaviour of the pipe significantly depends on the viscoelastic response of the pipe material. Pipe strains developed almost linearly from the leading end to the tailing end when the shear strength is fully mobilized over the entire pipe length. Research findings demonstrate the need for considering the time-dependent effects of pipe materials in describing the soil-pipeline interaction during the axial pullout.

Research paper thumbnail of Numerical Assessment of Dented Pipe Using Inline Inspection Data

Volume 1: Pipeline and Facilities Integrity, 2020

The current finite element (FE) assessment methods of dented pipes are based on specific dent pro... more The current finite element (FE) assessment methods of dented pipes are based on specific dent profiles, which are generally created based on the shape of indenters. However, the actual dent profile in real case scenarios is mostly irregular in shape, depending on the cause of damage. In this paper, FE analyses of dented pipes using inline inspection (ILI) data are presented. Based on the ILI data, the dent profile is generated by applying the nodal displacements to all the pipe nodes. The validation of this nodal displacement approach is discussed in this paper. Besides, a parametric study is carried out to study the behavior of dent for different dent depth, pipe geometry, and pipe grades. The significance of residual stresses generated during the dent formation on the behavior of dented pipe during the service life is also discussed. Finally, the remaining life estimation of dented pipes according to the API 579-1 is presented using FE analysis results.

Research paper thumbnail of Behavior of a branched buried MDPE gas distribution pipe under axial ground movement

Medium density polyethylene pipes (MDPE) are widely used for gas distribution systems in Canada a... more Medium density polyethylene pipes (MDPE) are widely used for gas distribution systems in Canada and worldwide. These pipes are often exposed to relative ground movements resulting from landslides and earthquakes. The effects of the relative ground movement on the pipes are influenced by the presence of lateral branches and the tee-joint connecting the branch. Only a limited study is currently available in the literature on studying the behavior of branched pipe subjected to ground movements. This paper presents an experimental investigation of a branched MDPE pipe subjected to axial ground movement. A test with a 60.3 mm diameter gas distribution pipe is conducted using the laboratory facility at Memorial University of Newfoundland. Pipe wall strains and soil pressures around the pipe are measured to capture the mechanism of soil-pipe interaction. Test results reveal that the pullout force and pipe wall strains are significantly influenced by the tee-joint. The elongation of the fle...

Research paper thumbnail of Modelling Time Dependent Behavior of Buried Polyethylene Pipes Using Abaqus

Buried polyethylene pipes are increasingly used for their various advantages over the metal pipes... more Buried polyethylene pipes are increasingly used for their various advantages over the metal pipes including light-weights, ease of installation and corrosion resistance. The polymer pipe material possesses time-dependent behavior that influence the pipe-soil interaction over time. The current industry practice to account for the time-dependent effect is to use secant modulii to calculate the short-term and long-term responses. A short-term and a long-term modulus of the pipe materials are used to calculate the pipe responses independently. This method is unable to predict the continuous time -depended pipe-soil interaction and the resulting pipe responses over time. To address this limitation, researchers are working toward developing time dependent material models for the pipe materials to conduct pipe-soil interaction analysis. A number of different visco-elastic and visco-plastic models were developed for polymer materials over the last few decades. However, these models are not ...

Research paper thumbnail of Assessment of Axial Pullout Force for Buried Medium-Density Polyethylene Pipelines

Journal of Pipeline Systems Engineering and Practice, 2021

AbstractThe maximum axial force on a pipeline subjected to axial ground movement is commonly calc... more AbstractThe maximum axial force on a pipeline subjected to axial ground movement is commonly calculated using a design equation developed without proper consideration of soil-pipe interaction. The ...

Research paper thumbnail of Interpretation of Acoustic Field Data for Leak Detection in Ductile Iron and Copper Water-Distribution Pipes

Journal of Pipeline Systems Engineering and Practice, 2017

AbstractThe acoustic emission (AE) method is becoming popular for detecting leaks in municipal wa... more AbstractThe acoustic emission (AE) method is becoming popular for detecting leaks in municipal water mains where leaks are identified and the locations are determined through the interpretation of ...

Research paper thumbnail of Nonlinear Analysis of Axisymmetrically Wrinkled Pipes Under Axial Loads and Internal Pressures

Volume 5A: Pipeline and Riser Technology, 2015

ABSTRACT

Research paper thumbnail of Application of Variational Theory: Vehicle Trajectory Reconstruction Fusing Video Sensor and Probe Data for Non-Lane Based Heterogeneous Condition NOTE: this record was deleted from TRID at the request of James Bryant, Technical Activities Division, due to copyright infringement

Transportation Research Board 95th Annual MeetingTransportation Research Board, 2016

Research paper thumbnail of Variational Formulation Incorporating Spatial Capacity Changes to Reconstruct Trajectory for Heterogeneous Traffic Condition

Canadian Journal of Civil Engineering, 2017

This study deals with the reconstruction of vehicle trajectories incorporating a data fusion fram... more This study deals with the reconstruction of vehicle trajectories incorporating a data fusion framework that combines video and probe sensor data in heterogeneous traffic conditions. The framework is based on the application of variational formulation (VF) of kinematic waves for multiple lane conditions. The VF requires cumulative count and reference trajectory as boundary conditions. The VF also requires generation of lopsided network using fundamental diagram (FD) parameters. In this regard, cumulative count and FD parameters are obtained from the video sensor, while reference vehicle trajectory is obtained from the probe sensor. The analysis shows that the framework can provide an accuracy of 83% in trajectory estimation from the nearest reference trajectory. However, the accuracy decreases as the reference trajectory gets farther away from the estimated one. Additionally, an extension of the VF to accommodate roadway side friction is presented. The FD as well as lopsided network ...

Research paper thumbnail of Application of Variational Theory: Vehicle Trajectory Reconstruction Fusing Video Sensor and Probe Data for Non-Lane Based Heterogeneous Condition

Research paper thumbnail of Nonlinear finite element analysis of dented pipes under internal pressure and axial loads

Proceedings of the 13th International Conference on Mechanical Engineering (ICME2019), 2021

The mechanical damages created on buried pipelines by any external activities are important consi... more The mechanical damages created on buried pipelines by any external activities are important consideration to assess the structural integrity of pipelines. The damages could be in the form of corrosion, dent, crack, gouge or any combination of these. A dent is a permanent inward plastic deformation in the pipe wall. The dents may not immediately cause failure of the pipe. However, it can reduce the pipe’s structural capacity and cause rupture or leak in the long run. The current researches focus on studying the behavior of dented pipe with respect to burst strength and fatigue life considering initial deformed shape. However, the effects of residual stresses formed during the formation of a dent on the performance of dented pipe are not extensively studied yet. In this study, finite-element modelling is used to understand the importance of residual stresses on the integrity assessment of dented pipe. The analysis results revealed that both residual stresses and stress history have significant effects on the structural capacity of dented pipes under internal pressure and axial loads.