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A finite-strain Cam-clay model in the framework of multiplicative elasto-plasticity. (English) Zbl 1016.74045
Summary: The present work discusses a finite-strain plasticity model for soft clays. To motivate such a model, the infinitesimal-strain assumption is shown to be inadequate for constitutive description of soft clays. Hence, assuming the multiplicative elasto-plastic decomposition of deformation gradient, we present a finite strain Cam-clay model. In particular, with respect to the original Cam-clay formulation, this model improves the description of isotropic compression behaviour as well as of elastic shearing response. The constitutive laws are discussed, and their implications are pointed out. The physical meaning of the model parameters is carefully addressed. Finally, the ability to properly match some experimental results available in the literature is assessed.

MSC:
74L10 Soil and rock mechanics
74C15 Large-strain, rate-independent theories of plasticity (including nonlinear plasticity)
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