基于平面应变试验的修正塑性功硬化软化模型  

Development of elasto-plastic model with revised plastic work function as hardening function based on plane strain tests

作　　者：马险峰[1,2] 望月秋利 蔡敏 

机构地区：[1]同济大学地下建筑与工程系岩土及地下工程重点实验室,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]德岛大学建设工学科,日本770-8506 [4]柏诚中国,北京100062

出　　处：《岩土工程学报》2007年第6期887-893,共7页Chinese Journal of Geotechnical Engineering

基　　金：教育部留学回国基金项目(0230241012)

摘　　要：以改良型平面应变仪为基础,通过一系列平面应变和三轴压缩试验,对砂土的应力应变特性进行了研究,推导出以修正塑性功为硬化参数的本构关系。改良型平面应变仪较好地解决了加载面的摩擦及约束问题,能保证ε2的控制精度,并采用了合理的变形量测整理方法。本文提出的弹塑性模型仍以传统塑性理论为框架,其弹性特性、破坏准则、硬化参数及塑性势等均直接从试验曲线推导,以修正塑性功为硬化参数的硬化准则函数能反映硬化及软化的全过程曲线,并从试验结果推导了非关联流动准则塑性势函数。该模型结构较为清晰,参数选取规范,模型验证表明计算结果与试验结果较为吻合。An improved plane strain test apparatus was first developed with some solutions for friction problem between load plate and specimen, control precision of ε2 and elimination of influence of confinement of both ends on volumetric strain measurement. A series of plane strain tests for sand were carded out together with triaxial compression tests and an elasto-plastic model was derived according to the test results. The elastic property, failure criteria, hardening parameter and hardening rule, and plastic potential function were all derived directly from the test results. It was shown again that the non-associated flow rule should be used for sand. Test results were simulated by the model using parameters derived from the tests, and the calculated stress-strain relation agreed well with the test results.

关 键 词：平面应变仪 本构模型 塑性功 硬化函数 

分 类 号：O344[理学—固体力学]