New material models for nonlinear stress-strain behaviour of composite materials

Composites ◽  
1989 ◽  
Vol 20 (4) ◽  
pp. 349-360 ◽  
Author(s):  
G. Abu-Farsakh
Keyword(s):  
Composite Materials ◽  
Stress Strain ◽  
Material Models ◽  
Strain Behaviour ◽  
Nonlinear Stress ◽  
New Material

A New Nonlinear Stress-Strain Model for Soils at Various Strain Levels

2013 ◽  
Vol 631-632 ◽  
pp. 782-788
Author(s):  
Cheng Chen ◽  
Zheng Ming Zhou
Keyword(s):  
Compression Test ◽  
Triaxial Compression ◽  
Small Strain ◽  
Empirical Formulas ◽  
Stress Strain ◽  
Strain Behaviour ◽  
Proposed Model ◽  
Nonlinear Stress ◽  
London Clay ◽  
Strain Model

Soils have nonlinear stiffness and develops irrecoverable strains even at very small strain levels. Accurate modeling of stress-strain behaviour at various strain levels is very important for predicting the deformation of soils. Some existing stress-strain models are reviewed and evaluated firstly. And then a new simple non-linear stress-strain model is proposed. Four undetermined parameters involved in the proposed model can be obtained through maximum Young’s module, deformation module, and limit deviator stress and linearity index of soils that can be measured from experiment directly or calculated by empirical formulas indirectly. The effectiveness of the proposed stress-strain model is examined by predicting stress-strain curves measured in plane-strain compression test on Toyota sand and undrained triaxial compression test on London clay. The fitting results of the proposed model are in good agreement with experimental data, which verify the effectiveness of the model.

Analysis of Nonlinear Stress-Strain Behavior of Fiber-Reinf orced Composite Materials

AIAA Journal ◽  
1977 ◽  
Vol 15 (12) ◽  
pp. 1669-1676 ◽  
Author(s):  
Robert M. Jones ◽  
Harold S. Morgan
Keyword(s):  
Composite Materials ◽  
Stress Strain ◽  
Strain Behavior ◽  
Nonlinear Stress

Earthquake-induced rock shear through a deposition hole: Laboratory tests on bentonite-material models and modelling of three scale tests

Clay Minerals ◽  
2018 ◽  
Vol 53 (2) ◽  
pp. 213-235
Author(s):  
Lennart Börgesson ◽  
Ann Dueck ◽  
Jan Hernelind
Keyword(s):  
Finite Element ◽  
Laboratory Tests ◽  
Spent Nuclear Fuel ◽  
Material Model ◽  
Spent Fuel ◽  
Stress Strain ◽  
Element Mesh ◽  
Material Models ◽  
Bentonite Buffer ◽  
Nonlinear Stress

ABSTRACTEarthquake-induced rock shear through a bentonite-filled deposition hole in a repository for spent nuclear fuel is an important scenario for the safety analysis because it may cause substantial damage to the canister hosting the spent fuel. Appropriate tools to investigate the effects on the buffer and the canister are required.The study described here explored the laboratory tests conducted to develop a material model of the bentonite buffer to be used in the simulations, the material models that these tests have provided and finite element (FE) simulations of three scale tests of a rock shear for comparison between modelled and measured results. The results were used for validation of the material models and the calculation technique that was used for modelling different rock-shear cases.The laboratory study consisted of swelling-pressure tests and tests to determine shear strength and stress-strain properties. The material model is elastic-plastic with a nonlinear stress-strain relation which depends on the density of the bentonite buffer and is a function of the strain rate. The three scale tests were modelled using theAbaqusfinite element code. Good agreement between modelled and measured results was observed, in spite of the complexity of the models and the difficulties associated with measuring stresses and strains under the very fast shear.The modelling results thus validate the modelling of the SR-Site. The modelling technique, the element mesh and the material models used in these analyses are well fitted and useful for this type of modelling.

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