A work-hardening and softening constitutive model for sand:modified plastic strain energy approach  

作　　者：FanglePeng M.S.A.Siddiquee ShaomingLiao 

机构地区：[1]DepartmentofGeotechnicalEngineering,TongiiUniversity,Shanghai200092,China [2]DepartmentofCivilEngineering,TheUniversityofTokyo,Tokyo1138656,Japan [3]DepartmentofGeotechnicalEngineering,TongiiUniversity,Shanghai200092,China//DepartmentofCivilEngineering,TheUniversityofTokyo,Tokyo1138656,Japan

出　　处：《Acta Mechanica Sinica》2005年第1期76-86,共11页力学学报（英文版）

基　　金：The project supported by the Association of International Education of Japan

摘　　要：The paper describes an energy-based constitutive model for sand, which is modified based on the modified plastic strain energy approach, represented by a unique relationship between the modified plastic strain energy and a stress parameter, independent of stress history. The modified plastic strain energy approach was developed based on results from a series of drained plastic strain compression tests along various stress paths on saturated dense Toyoura sand with accurate stress and strain measurements. The proposed model is coupled with an isotropically work-hardening and softening, non-associtated, elasto-plastic material description. The constitutive model concerns the inherent and stress system-induced cross-anisotropic elastic deformation properties of sand. It is capable of simulating the deformation characteristics of stress history and stress path, the effects of pressure level, anisotropic strength and void ratio, and the strain localization.The paper describes an energy-based constitutive model for sand, which is modified based on the modified plastic strain energy approach, represented by a unique relationship between the modified plastic strain energy and a stress parameter, independent of stress history. The modified plastic strain energy approach was developed based on results from a series of drained plastic strain compression tests along various stress paths on saturated dense Toyoura sand with accurate stress and strain measurements. The proposed model is coupled with an isotropically work-hardening and softening, non-associtated, elasto-plastic material description. The constitutive model concerns the inherent and stress system-induced cross-anisotropic elastic deformation properties of sand. It is capable of simulating the deformation characteristics of stress history and stress path, the effects of pressure level, anisotropic strength and void ratio, and the strain localization.

关 键 词：SAND Energy-based Hardening and softening Elasto-plastic model Stress-strain relation 

分 类 号：O344.3[理学—固体力学]