一种基于高阶梯度理论的微构件力学尺度效应模型  

A Size Effect Model for Micro-component Based on High Order Strain Gradient Theory

作　　者：原波[1] 丘永亮[1] 何显运[1] 徐勇军[1] YUAN Bo;QIU Yong-liang;HE Xian-yun;XU Yong-jun(Department of Mechanical Engineering, Guangdong Polytechnic of Industry ＆ Commerce, Guangzhou 510510, Guangdong, China)

机构地区：[1]广东工贸职业技术学院机械工程系,广东广州510510

出　　处：《合成材料老化与应用》2017年第6期108-111,共4页Synthetic Materials Aging and Application

基　　金：广东省高等职业院校珠江学者岗位计划资助项目(2016);国家自然科学基金项目(No.51202069)

摘　　要：实验发现微构件的力学性能存在尺度效应,传统力学模型无法解释这一现象。该论文基于高阶应变梯度理论构建了一种针对微构件在三点弯曲实验中的弹性性能的尺度效应模型,该模型包含一个与材料自身相关的一个参数,可以解释微构件在实验过程中弹性力学性能的尺度效应。通过对比该理论模型与已有模型之间的关系,分析了模型的适用性。Size effect has been observed from the mechanical testing of micro-components,classical mechanical model cannot be used to explain this phenomenon. In this paper,a model based on high order strain gradient（ HSGE） theory is constructed to predict the bending size dependence of the elastic property of microfibers under three-point tests. The model contains a length scale material parameter and can be applied to explain the size dependency in bending test for micro-components. The applicability of the model was analyzed by comparing with published model.

关 键 词：微构件 尺度效应 高阶梯度理论 

分 类 号：TQ317.3[化学工程—高聚物工业]