The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
L Iannucci - One of the best experts on this subject based on the ideXlab platform.
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measurement of the in situ ply fracture toughness associated with mode i fibre tensile failure in frp part i data reduction
Composites Science and Technology, 2010Co-Authors: M J Laffan, S T Pinho, P Robinson, L IannucciAbstract:The fracture toughness associated with fibre tensile failure was measured for a T300/920 laminated carbon/Epoxy Material system using the compact tension specimen configuration. Six methods of data reduction were investigated for calculation of the toughness with the aim of finding the best technique, in terms of reproducibility of results and simplicity. The calculated fracture toughnesses were found to correlate well, though varying amounts of scatter were produced by each method. An optimum method was proposed that does not rely on the use of an optically measured crack length.
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measurement of the in situ ply fracture toughness associated with mode i fibre tensile failure in frp part ii size and lay up effects
Composites Science and Technology, 2010Co-Authors: M J Laffan, S T Pinho, P Robinson, L IannucciAbstract:Abstract The in-plane size, thickness and lay-up effects on the measured fracture toughness associated with fibre tensile failure were investigated for a T300/920 laminated carbon/Epoxy Material system. Compact tension specimens were tested with scaled in-plane size, increased thickness, and having various proportions of plies orientated at 0° and 90° to the loading direction. No in-plane size effects were discovered; however, testing revealed a thickness dependence. It was found that the ply toughness is significantly dependent on the thickness of the 0° layers. Propagation values of toughness were measured to be 132 kJ/m2 for specimens made up of [90/02] sub-laminates and between 57 and 69 kJ/m2 for all other configurations. Investigation of the fracture surfaces using SEM revealed that the increase in measured toughness for specimens with thicker 0° plies was due to an increase in the amount of pulled-out 0° fibres.
M J Laffan - One of the best experts on this subject based on the ideXlab platform.
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measurement of the in situ ply fracture toughness associated with mode i fibre tensile failure in frp part i data reduction
Composites Science and Technology, 2010Co-Authors: M J Laffan, S T Pinho, P Robinson, L IannucciAbstract:The fracture toughness associated with fibre tensile failure was measured for a T300/920 laminated carbon/Epoxy Material system using the compact tension specimen configuration. Six methods of data reduction were investigated for calculation of the toughness with the aim of finding the best technique, in terms of reproducibility of results and simplicity. The calculated fracture toughnesses were found to correlate well, though varying amounts of scatter were produced by each method. An optimum method was proposed that does not rely on the use of an optically measured crack length.
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measurement of the in situ ply fracture toughness associated with mode i fibre tensile failure in frp part ii size and lay up effects
Composites Science and Technology, 2010Co-Authors: M J Laffan, S T Pinho, P Robinson, L IannucciAbstract:Abstract The in-plane size, thickness and lay-up effects on the measured fracture toughness associated with fibre tensile failure were investigated for a T300/920 laminated carbon/Epoxy Material system. Compact tension specimens were tested with scaled in-plane size, increased thickness, and having various proportions of plies orientated at 0° and 90° to the loading direction. No in-plane size effects were discovered; however, testing revealed a thickness dependence. It was found that the ply toughness is significantly dependent on the thickness of the 0° layers. Propagation values of toughness were measured to be 132 kJ/m2 for specimens made up of [90/02] sub-laminates and between 57 and 69 kJ/m2 for all other configurations. Investigation of the fracture surfaces using SEM revealed that the increase in measured toughness for specimens with thicker 0° plies was due to an increase in the amount of pulled-out 0° fibres.
Jens Henrik Andreasen - One of the best experts on this subject based on the ideXlab platform.
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thermo mechanical characterisation of in plane properties for csm e glass Epoxy polymer composite Materials part 2 young s modulus
Polymer Testing, 2013Co-Authors: Johnny Jakobsen, Martin Jensen, Jens Henrik AndreasenAbstract:Abstract The in-plane Young's modulus of a CSM E-glass/Epoxy Material is characterised through the use of dynamic mechanical analysis (DMA). The measured data is used to generate Material models which describe the property behaviour as a function of conversion and temperature. Gelation of the Epoxy resin plays a major role in the modulus development and is measured directly on the glass/Epoxy Material. The Young's modulus is described through a bi-functional model including the liquid/solid transition of the Material. The evolution of Young's modulus is modelled by decoupling modulus increments caused by time and temperature, and is graphically illustrated through a Modulus-Temperature-Transformation (MTT) diagram. Based on the established Material models presented in this paper and models in Part-1, it is feasible to assess residual stresses and shape distortions of composite parts made from this glass/Epoxy Material.
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thermo mechanical characterisation of in plane properties for csm e glass Epoxy polymer composite Materials part 1 thermal and chemical strain
Polymer Testing, 2013Co-Authors: Johnny Jakobsen, Martin Jensen, Jens Henrik AndreasenAbstract:Abstract The in-plane thermo-mechanical properties and residual stresses of a CSM E-glass/Epoxy Material are characterised through the use of DSC and TMA. The measured data is used to generate Material models which describe the mechanical behaviour as a function of conversion and temperature. The in-plane thermal expansion coefficient (α) of the composite Material decreases above the glass transition temperature (T g ), which is compensated by a higher out of plane deformation above T g . Comparison of α and chemical shrinkage measurements suggests that chemical bonds between the polymer matrix and the glass fibres are formed prior to shrinkage of the Epoxy matrix, i.e., at an early processing stage. This suggests that production of composites with low residual stresses requires focus on reactivity between the matrix and the sizing rather than the matrix cure properties. As a consequence, residual stresses in the composite Material are mainly a result of restricted cure shrinkage rather than mismatch between thermal expansion coefficients.
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Thermo-mechanical characterisation of in-plane properties for CSM E-glass Epoxy polymer composite Materials – Part 2: Young's modulus
Polymer Testing, 2013Co-Authors: Johnny Jakobsen, Martin Jensen, Jens Henrik AndreasenAbstract:Abstract The in-plane Young's modulus of a CSM E-glass/Epoxy Material is characterised through the use of dynamic mechanical analysis (DMA). The measured data is used to generate Material models which describe the property behaviour as a function of conversion and temperature. Gelation of the Epoxy resin plays a major role in the modulus development and is measured directly on the glass/Epoxy Material. The Young's modulus is described through a bi-functional model including the liquid/solid transition of the Material. The evolution of Young's modulus is modelled by decoupling modulus increments caused by time and temperature, and is graphically illustrated through a Modulus-Temperature-Transformation (MTT) diagram. Based on the established Material models presented in this paper and models in Part-1, it is feasible to assess residual stresses and shape distortions of composite parts made from this glass/Epoxy Material.
Martin Jensen - One of the best experts on this subject based on the ideXlab platform.
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thermo mechanical characterisation of in plane properties for csm e glass Epoxy polymer composite Materials part 2 young s modulus
Polymer Testing, 2013Co-Authors: Johnny Jakobsen, Martin Jensen, Jens Henrik AndreasenAbstract:Abstract The in-plane Young's modulus of a CSM E-glass/Epoxy Material is characterised through the use of dynamic mechanical analysis (DMA). The measured data is used to generate Material models which describe the property behaviour as a function of conversion and temperature. Gelation of the Epoxy resin plays a major role in the modulus development and is measured directly on the glass/Epoxy Material. The Young's modulus is described through a bi-functional model including the liquid/solid transition of the Material. The evolution of Young's modulus is modelled by decoupling modulus increments caused by time and temperature, and is graphically illustrated through a Modulus-Temperature-Transformation (MTT) diagram. Based on the established Material models presented in this paper and models in Part-1, it is feasible to assess residual stresses and shape distortions of composite parts made from this glass/Epoxy Material.
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thermo mechanical characterisation of in plane properties for csm e glass Epoxy polymer composite Materials part 1 thermal and chemical strain
Polymer Testing, 2013Co-Authors: Johnny Jakobsen, Martin Jensen, Jens Henrik AndreasenAbstract:Abstract The in-plane thermo-mechanical properties and residual stresses of a CSM E-glass/Epoxy Material are characterised through the use of DSC and TMA. The measured data is used to generate Material models which describe the mechanical behaviour as a function of conversion and temperature. The in-plane thermal expansion coefficient (α) of the composite Material decreases above the glass transition temperature (T g ), which is compensated by a higher out of plane deformation above T g . Comparison of α and chemical shrinkage measurements suggests that chemical bonds between the polymer matrix and the glass fibres are formed prior to shrinkage of the Epoxy matrix, i.e., at an early processing stage. This suggests that production of composites with low residual stresses requires focus on reactivity between the matrix and the sizing rather than the matrix cure properties. As a consequence, residual stresses in the composite Material are mainly a result of restricted cure shrinkage rather than mismatch between thermal expansion coefficients.
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Thermo-mechanical characterisation of in-plane properties for CSM E-glass Epoxy polymer composite Materials – Part 2: Young's modulus
Polymer Testing, 2013Co-Authors: Johnny Jakobsen, Martin Jensen, Jens Henrik AndreasenAbstract:Abstract The in-plane Young's modulus of a CSM E-glass/Epoxy Material is characterised through the use of dynamic mechanical analysis (DMA). The measured data is used to generate Material models which describe the property behaviour as a function of conversion and temperature. Gelation of the Epoxy resin plays a major role in the modulus development and is measured directly on the glass/Epoxy Material. The Young's modulus is described through a bi-functional model including the liquid/solid transition of the Material. The evolution of Young's modulus is modelled by decoupling modulus increments caused by time and temperature, and is graphically illustrated through a Modulus-Temperature-Transformation (MTT) diagram. Based on the established Material models presented in this paper and models in Part-1, it is feasible to assess residual stresses and shape distortions of composite parts made from this glass/Epoxy Material.
P Robinson - One of the best experts on this subject based on the ideXlab platform.
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measurement of the in situ ply fracture toughness associated with mode i fibre tensile failure in frp part i data reduction
Composites Science and Technology, 2010Co-Authors: M J Laffan, S T Pinho, P Robinson, L IannucciAbstract:The fracture toughness associated with fibre tensile failure was measured for a T300/920 laminated carbon/Epoxy Material system using the compact tension specimen configuration. Six methods of data reduction were investigated for calculation of the toughness with the aim of finding the best technique, in terms of reproducibility of results and simplicity. The calculated fracture toughnesses were found to correlate well, though varying amounts of scatter were produced by each method. An optimum method was proposed that does not rely on the use of an optically measured crack length.
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measurement of the in situ ply fracture toughness associated with mode i fibre tensile failure in frp part ii size and lay up effects
Composites Science and Technology, 2010Co-Authors: M J Laffan, S T Pinho, P Robinson, L IannucciAbstract:Abstract The in-plane size, thickness and lay-up effects on the measured fracture toughness associated with fibre tensile failure were investigated for a T300/920 laminated carbon/Epoxy Material system. Compact tension specimens were tested with scaled in-plane size, increased thickness, and having various proportions of plies orientated at 0° and 90° to the loading direction. No in-plane size effects were discovered; however, testing revealed a thickness dependence. It was found that the ply toughness is significantly dependent on the thickness of the 0° layers. Propagation values of toughness were measured to be 132 kJ/m2 for specimens made up of [90/02] sub-laminates and between 57 and 69 kJ/m2 for all other configurations. Investigation of the fracture surfaces using SEM revealed that the increase in measured toughness for specimens with thicker 0° plies was due to an increase in the amount of pulled-out 0° fibres.