An elasto-plastic constitutive model with hardening-softening behavior for sandy soil based on modified-plastic work state function

作者：Peng Fangle^*; Bai Xiaoyu; Tan Ke; Tatsuoka Fumio

来源：Journal of Tongji University(Natural Science), 2009, 37(6): 720-726.

• Deformation Characteristics
• Drained plane strain compressions
• Elastoplastic constitutive model
• Elastoplastic materials
• Hardening function
• Inherent anisotropy
• Irreversible strain
• Plane strain compression
• Plastic work
• Pressure level
• Sandy soil
• Sandy soils
• Softening behavior
• State functions
• Strain localizations
• Stress history
• Stress parameter
• Stress paths
• Toyoura sand
• Void ratios
• Work hardening

A new elasto-plastic constitutive model for sand is proposed according to a stress path-independent energy-based hardening function. A stress path-independent relationship between the irreversible strain energy and a stress parameter is formulated based on results from a series of drained plane strain compression (PSC) tests on saturated dense Toyoura sand with precise stress and strain measurements performed along a wide variety of stress path. The model is coupled with an isotropically work-hardening and-softening, non-associated, elasto-plastic material description. The FEM code incorporating the above-mentioned model is validated by simulating physical PSC tests. The proposed model can better simulate the effects on the deformation characteristics of stress history as well as those of pressure level, inherent anisotropy, void ratio and work-softening associated with strain localization into a shear band.

• 出版日期2009
• 单位同济大学