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M Langseth - One of the best experts on this subject based on the ideXlab platform.
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stress Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: Y Chen, Odd Sture Hopperstad, A H Clausen, M LangsethAbstract:Abstract The stress–Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress–Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy.
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Stress–Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: A H Clausen, Odd Sture Hopperstad, M LangsethAbstract:Abstract The stress–Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress–Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy.
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Stress-Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: A H Clausen, Odd Sture Hopperstad, M LangsethAbstract:The stress-Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress-Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy. © 2009 Elsevier Ltd. All rights reserved.
A H Clausen - One of the best experts on this subject based on the ideXlab platform.
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local measurement of stress Strain Behaviour of ductile materials at elevated temperatures in a split hopkinson tension bar system
Strain, 2014Co-Authors: V Vilamosa, A H Clausen, Odd Sture Hopperstad, Egil Fagerholt, Tore BorvikAbstract:A split-Hopkinson tension bar system is modified to allow for measuring the stress-Strain Behaviour of ductile materials at large Strains, high Strain rates and elevated temperatures. The specimen is heated by induction, and a pyrometer provides a laser-based temperature measurement that controls the testing temperature in a feed-back loop. A high-speed digital camera system and an edge detection algorithm are used to obtain local measures of Strain after necking of the axisymmetric specimens. Using the local Strain measurements and Bridgman's analytical formulas, it is feasible to find the equivalent stress-Strain curve to fracture for different levels of Strain rate and temperature. Thermal and thermo-mechanical finite element simulations of the test set-up are used to evaluate the validity of the proposed experimental method.
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stress Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: Y Chen, Odd Sture Hopperstad, A H Clausen, M LangsethAbstract:Abstract The stress–Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress–Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy.
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Stress–Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: A H Clausen, Odd Sture Hopperstad, M LangsethAbstract:Abstract The stress–Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress–Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy.
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Stress-Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: A H Clausen, Odd Sture Hopperstad, M LangsethAbstract:The stress-Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress-Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy. © 2009 Elsevier Ltd. All rights reserved.
S W Sloan - One of the best experts on this subject based on the ideXlab platform.
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elastoplastic modelling of hydraulic and stress Strain Behaviour of unsaturated soils
Mechanics of Materials, 2007Co-Authors: Daichao Sheng, S W SloanAbstract:This paper presents an elastoplastic model for predicting the hydraulic and stress–Strain Behaviour of unsaturated soils. The model takes into consideration the effect of the degree of saturation on stress–Strain Behaviour, the effect of the void ratio on water-retention Behaviour, and the influence of suction. Model predictions of the stress–Strain and water-retention response are compared with those obtained from triaxial tests on unsaturated soil during isotropic and shear loading with and without suction change. The comparisons indicate that the model can quantitatively reproduce the hydraulic and mechanical Behaviour of unsaturated soils. 2006 Elsevier Ltd. All rights reserved.
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Elastoplastic modelling of hydraulic and stress–Strain Behaviour of unsaturated soils
Mechanics of Materials, 2007Co-Authors: Daichao Sheng, S W SloanAbstract:This paper presents an elastoplastic model for predicting the hydraulic and stress–Strain Behaviour of unsaturated soils. The model takes into consideration the effect of the degree of saturation on stress–Strain Behaviour, the effect of the void ratio on water-retention Behaviour, and the influence of suction. Model predictions of the stress–Strain and water-retention response are compared with those obtained from triaxial tests on unsaturated soil during isotropic and shear loading with and without suction change. The comparisons indicate that the model can quantitatively reproduce the hydraulic and mechanical Behaviour of unsaturated soils. 2006 Elsevier Ltd. All rights reserved.
Odd Sture Hopperstad - One of the best experts on this subject based on the ideXlab platform.
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local measurement of stress Strain Behaviour of ductile materials at elevated temperatures in a split hopkinson tension bar system
Strain, 2014Co-Authors: V Vilamosa, A H Clausen, Odd Sture Hopperstad, Egil Fagerholt, Tore BorvikAbstract:A split-Hopkinson tension bar system is modified to allow for measuring the stress-Strain Behaviour of ductile materials at large Strains, high Strain rates and elevated temperatures. The specimen is heated by induction, and a pyrometer provides a laser-based temperature measurement that controls the testing temperature in a feed-back loop. A high-speed digital camera system and an edge detection algorithm are used to obtain local measures of Strain after necking of the axisymmetric specimens. Using the local Strain measurements and Bridgman's analytical formulas, it is feasible to find the equivalent stress-Strain curve to fracture for different levels of Strain rate and temperature. Thermal and thermo-mechanical finite element simulations of the test set-up are used to evaluate the validity of the proposed experimental method.
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stress Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: Y Chen, Odd Sture Hopperstad, A H Clausen, M LangsethAbstract:Abstract The stress–Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress–Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy.
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Stress–Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: A H Clausen, Odd Sture Hopperstad, M LangsethAbstract:Abstract The stress–Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress–Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy.
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Stress-Strain Behaviour of aluminium alloys at a wide range of Strain rates
International Journal of Solids and Structures, 2009Co-Authors: A H Clausen, Odd Sture Hopperstad, M LangsethAbstract:The stress-Strain Behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of Strain rates. Tensile tests at low to medium Strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of Strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress-Strain Behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of Strain hardening, Strain-rate hardening, thermal softening and plastic anisotropy. © 2009 Elsevier Ltd. All rights reserved.
Daichao Sheng - One of the best experts on this subject based on the ideXlab platform.
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elastoplastic modelling of hydraulic and stress Strain Behaviour of unsaturated soils
Mechanics of Materials, 2007Co-Authors: Daichao Sheng, S W SloanAbstract:This paper presents an elastoplastic model for predicting the hydraulic and stress–Strain Behaviour of unsaturated soils. The model takes into consideration the effect of the degree of saturation on stress–Strain Behaviour, the effect of the void ratio on water-retention Behaviour, and the influence of suction. Model predictions of the stress–Strain and water-retention response are compared with those obtained from triaxial tests on unsaturated soil during isotropic and shear loading with and without suction change. The comparisons indicate that the model can quantitatively reproduce the hydraulic and mechanical Behaviour of unsaturated soils. 2006 Elsevier Ltd. All rights reserved.
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Elastoplastic modelling of hydraulic and stress–Strain Behaviour of unsaturated soils
Mechanics of Materials, 2007Co-Authors: Daichao Sheng, S W SloanAbstract:This paper presents an elastoplastic model for predicting the hydraulic and stress–Strain Behaviour of unsaturated soils. The model takes into consideration the effect of the degree of saturation on stress–Strain Behaviour, the effect of the void ratio on water-retention Behaviour, and the influence of suction. Model predictions of the stress–Strain and water-retention response are compared with those obtained from triaxial tests on unsaturated soil during isotropic and shear loading with and without suction change. The comparisons indicate that the model can quantitatively reproduce the hydraulic and mechanical Behaviour of unsaturated soils. 2006 Elsevier Ltd. All rights reserved.
