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Papers by Mustafa Abd-ALhussein

Diagnostyka

Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. In... more Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. Interlaminar damage, known as "delamination," is a major issue for composite laminates. Results from Mode-I and Mode-II experimental testing on twill-woven carbon fiber reinforced (CFRP) laminates are analyzed in this paper. Composite Mode-I fracture toughness was determined using three different methods in accordance with ASTM D5528: modified beam theory, compliance calibration, and a codified compliance calibration. Two methods, the Compliance Calibration Method and the Compliance-Based Beam Method, were used to determine the Mode-II fracture toughness in accordance with ASTM D7905. Stick-slip behavior is quite evident in the composite's Mode-I fracture toughness test findings. The MBT technique's Ic values for initiation and propagation are 0.533 and 0.679 KJ/m 2 , respectively. When comparing the MBT approach to the industry-standard ASTM procedure for determining fracture toughness Mode-I, the MBT method was shown to be highly compatible. Furthermore, the IIc values for the CBBM technique are 1.65 KJ/m 2 for non-pre cracked and 1.4 KJ/m 2 for pre-cracked materials. The CBBM method shows a good method to evaluate fracture toughness Mode-II, due to not needing to monitor the length of the crack during delamination growth to get the value of the fracture toughness.

diagnostyka, 2023

Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. In... more Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. Interlaminar damage, known as "delamination," is a major issue for composite laminates. Results from Mode-I and Mode-II experimental testing on twill-woven carbon fiber reinforced (CFRP) laminates are analyzed in this paper. Composite Mode-I fracture toughness was determined using three different methods in accordance with ASTM D5528: modified beam theory, compliance calibration, and a codified compliance calibration. Two methods, the Compliance Calibration Method and the Compliance-Based Beam Method, were used to determine the Mode-II fracture toughness in accordance with ASTM D7905. Stick-slip behavior is quite evident in the composite's Mode-I fracture toughness test findings. The MBT technique's Ic values for initiation and propagation are 0.533 and 0.679 KJ/m 2 , respectively. When comparing the MBT approach to the industry-standard ASTM procedure for determining fracture toughness Mode-I, the MBT method was shown to be highly compatible. Furthermore, the IIc values for the CBBM technique are 1.65 KJ/m 2 for non-pre cracked and 1.4 KJ/m 2 for pre-cracked materials. The CBBM method shows a good method to evaluate fracture toughness Mode-II, due to not needing to monitor the length of the crack during delamination growth to get the value of the fracture toughness.

Diagnostyka

A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environme... more A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environment depends on the Virtual Crack Closure Technique (VCCT) method to test a double cantilever beam (DCB) according to the ASTM D5528 standard. Four kinds of laminate stacking sequences were considered. According to the results, the distribution of the strain energy release rates obtained along the delamination front in bending-extension and extension-twisting coupling had a good affinity with bending-extension coupling. At the same time, critical fracture toughness values were estimated to be around 87.9% of critical fracture toughness values bending-extension coupling. These results are proof of the bending-extension and extensiontwisting coupling success while testing the proximity to bending-extension coupling results of the DCB beam. These findings are compatible with the standard ASTM D5288. Therefore, the bending-extension and extension-twisting coupling provide a good indication of the delamination resistance during buckling tests of the composite.

In this work, the flow properties of low-density polyethylene melt studied experimentally in a si... more In this work, the flow properties of low-density polyethylene melt studied experimentally in a single-bore capillary rheometer and numerically using POLFLOW - Ansys software based on a finite element, through the generalized Newtonian fluid. Both experimental and numerical works are performed according to the power law model. A series of capillary dies with different length-to- diameter ratios are used and experiments were examined over a shear rate range of (3 to 1500) 1/s at three temperatures (150,170, and 190) °C. The shear and extensional viscosities, shear stress, pressure, swelling and surface quality are tested experimentally, while shear stress, shear viscosity, die swell and vortex at barrel corner are obtained numerically. The experimental results show that the shear viscosity and decreases shear stress and increases with the shear rate increasing for all L/D ratios. The extensional viscosity indicates shear thickening and shear thinning at 170 °C, while the shear thinning dominant at 150 °C and 190 °C with the strain rate increasing. In addition, the extensional viscosity decreases with length-to- diameter ratios decreasing and temperature increasing and the shear viscosity decreases with temperature increasing, while the effect of length-to- diameter ratios is negligible. In the other, hand the swelling increases with the shear rate increasing and decreases with the length-to- diameter ratios increasing. The surface quality decreases and the pressure increases with the shear rate increasing for all length-to- diameter ratios. Swelling, shear viscosity and shear stress behavior numerically indicate a good agreement with the corresponding experimental results. In addition, a positive relation between vortex at the barrel corner and swelling obtained numerically. Finally, optimum surface quality can be produced at specific pressure, shear stress and viscosity.

This work focuses on the studies of pressure coefficient at high shear rate of LDPE melt flow exp... more This work focuses on the studies of pressure coefficient at high shear rate
of LDPE melt flow experimentally in single pore capillary rheometer and numerically. LDPE melt was extruded at shear rate (300 - 1500 1/s) under different temperatures and die diameters. Pressure coefficients was investigated at constant shear rate due to the 1 and 2 mm die diameters and 150,170,190 Celsius technique used through ANSYS/ POLYFLOW to check the pressure distribution and pressure drop along the capillary die due to the different temperatures, shear rate and die diameter. The results show that the pressure coefficient decreased with the temperature, shear rate and die diameter increasing. Shear rate and temperature produced higher and lower effect on the pressure dependence respectively, while the die diameter indicates the moderate effect. The more stability behavior of obtained at higher shear rate, higher die diameter and higher temperature. Numerical and experimental results indicate a good agreement in pressure drop values and the effect of shear rate, die diameter and temperature on the pressure distribution

A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environme... more A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environment depends on the Virtual Crack Closure Technique (VCCT) method to test a double cantilever beam (DCB) according to the ASTM D5528 standard. Four kinds of laminate stacking sequences were considered. According to the results, the distribution of the strain energy release rates obtained along the delamination front in bending-extension and extension-twisting coupling had a good affinity with bending-extension coupling. At the same time, critical fracture toughness values were estimated to be around 87.9% of critical fracture toughness values bending-extension coupling. These results are proof of the bending-extension and extensiontwisting coupling success while testing the proximity to bending-extension coupling results of the DCB beam. These findings are compatible with the standard ASTM D5288. Therefore, the bending-extension and extension-twisting coupling provide a good indication of the delamination resistance during buckling tests of the composite.

Diagnostyka

Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. In... more Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. Interlaminar damage, known as "delamination," is a major issue for composite laminates. Results from Mode-I and Mode-II experimental testing on twill-woven carbon fiber reinforced (CFRP) laminates are analyzed in this paper. Composite Mode-I fracture toughness was determined using three different methods in accordance with ASTM D5528: modified beam theory, compliance calibration, and a codified compliance calibration. Two methods, the Compliance Calibration Method and the Compliance-Based Beam Method, were used to determine the Mode-II fracture toughness in accordance with ASTM D7905. Stick-slip behavior is quite evident in the composite's Mode-I fracture toughness test findings. The MBT technique's Ic values for initiation and propagation are 0.533 and 0.679 KJ/m 2 , respectively. When comparing the MBT approach to the industry-standard ASTM procedure for determining fracture toughness Mode-I, the MBT method was shown to be highly compatible. Furthermore, the IIc values for the CBBM technique are 1.65 KJ/m 2 for non-pre cracked and 1.4 KJ/m 2 for pre-cracked materials. The CBBM method shows a good method to evaluate fracture toughness Mode-II, due to not needing to monitor the length of the crack during delamination growth to get the value of the fracture toughness.

diagnostyka, 2023

Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. In... more Mechanically, composite laminates perform exceptionally well in-plane but poorly out-of-plane. Interlaminar damage, known as "delamination," is a major issue for composite laminates. Results from Mode-I and Mode-II experimental testing on twill-woven carbon fiber reinforced (CFRP) laminates are analyzed in this paper. Composite Mode-I fracture toughness was determined using three different methods in accordance with ASTM D5528: modified beam theory, compliance calibration, and a codified compliance calibration. Two methods, the Compliance Calibration Method and the Compliance-Based Beam Method, were used to determine the Mode-II fracture toughness in accordance with ASTM D7905. Stick-slip behavior is quite evident in the composite's Mode-I fracture toughness test findings. The MBT technique's Ic values for initiation and propagation are 0.533 and 0.679 KJ/m 2 , respectively. When comparing the MBT approach to the industry-standard ASTM procedure for determining fracture toughness Mode-I, the MBT method was shown to be highly compatible. Furthermore, the IIc values for the CBBM technique are 1.65 KJ/m 2 for non-pre cracked and 1.4 KJ/m 2 for pre-cracked materials. The CBBM method shows a good method to evaluate fracture toughness Mode-II, due to not needing to monitor the length of the crack during delamination growth to get the value of the fracture toughness.

Diagnostyka

A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environme... more A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environment depends on the Virtual Crack Closure Technique (VCCT) method to test a double cantilever beam (DCB) according to the ASTM D5528 standard. Four kinds of laminate stacking sequences were considered. According to the results, the distribution of the strain energy release rates obtained along the delamination front in bending-extension and extension-twisting coupling had a good affinity with bending-extension coupling. At the same time, critical fracture toughness values were estimated to be around 87.9% of critical fracture toughness values bending-extension coupling. These results are proof of the bending-extension and extensiontwisting coupling success while testing the proximity to bending-extension coupling results of the DCB beam. These findings are compatible with the standard ASTM D5288. Therefore, the bending-extension and extension-twisting coupling provide a good indication of the delamination resistance during buckling tests of the composite.

In this work, the flow properties of low-density polyethylene melt studied experimentally in a si... more In this work, the flow properties of low-density polyethylene melt studied experimentally in a single-bore capillary rheometer and numerically using POLFLOW - Ansys software based on a finite element, through the generalized Newtonian fluid. Both experimental and numerical works are performed according to the power law model. A series of capillary dies with different length-to- diameter ratios are used and experiments were examined over a shear rate range of (3 to 1500) 1/s at three temperatures (150,170, and 190) °C. The shear and extensional viscosities, shear stress, pressure, swelling and surface quality are tested experimentally, while shear stress, shear viscosity, die swell and vortex at barrel corner are obtained numerically. The experimental results show that the shear viscosity and decreases shear stress and increases with the shear rate increasing for all L/D ratios. The extensional viscosity indicates shear thickening and shear thinning at 170 °C, while the shear thinning dominant at 150 °C and 190 °C with the strain rate increasing. In addition, the extensional viscosity decreases with length-to- diameter ratios decreasing and temperature increasing and the shear viscosity decreases with temperature increasing, while the effect of length-to- diameter ratios is negligible. In the other, hand the swelling increases with the shear rate increasing and decreases with the length-to- diameter ratios increasing. The surface quality decreases and the pressure increases with the shear rate increasing for all length-to- diameter ratios. Swelling, shear viscosity and shear stress behavior numerically indicate a good agreement with the corresponding experimental results. In addition, a positive relation between vortex at the barrel corner and swelling obtained numerically. Finally, optimum surface quality can be produced at specific pressure, shear stress and viscosity.

This work focuses on the studies of pressure coefficient at high shear rate of LDPE melt flow exp... more This work focuses on the studies of pressure coefficient at high shear rate
of LDPE melt flow experimentally in single pore capillary rheometer and numerically. LDPE melt was extruded at shear rate (300 - 1500 1/s) under different temperatures and die diameters. Pressure coefficients was investigated at constant shear rate due to the 1 and 2 mm die diameters and 150,170,190 Celsius technique used through ANSYS/ POLYFLOW to check the pressure distribution and pressure drop along the capillary die due to the different temperatures, shear rate and die diameter. The results show that the pressure coefficient decreased with the temperature, shear rate and die diameter increasing. Shear rate and temperature produced higher and lower effect on the pressure dependence respectively, while the die diameter indicates the moderate effect. The more stability behavior of obtained at higher shear rate, higher die diameter and higher temperature. Numerical and experimental results indicate a good agreement in pressure drop values and the effect of shear rate, die diameter and temperature on the pressure distribution

A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environme... more A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environment depends on the Virtual Crack Closure Technique (VCCT) method to test a double cantilever beam (DCB) according to the ASTM D5528 standard. Four kinds of laminate stacking sequences were considered. According to the results, the distribution of the strain energy release rates obtained along the delamination front in bending-extension and extension-twisting coupling had a good affinity with bending-extension coupling. At the same time, critical fracture toughness values were estimated to be around 87.9% of critical fracture toughness values bending-extension coupling. These results are proof of the bending-extension and extensiontwisting coupling success while testing the proximity to bending-extension coupling results of the DCB beam. These findings are compatible with the standard ASTM D5288. Therefore, the bending-extension and extension-twisting coupling provide a good indication of the delamination resistance during buckling tests of the composite.