基于近场动力学理论的准脆性材料的本构力函数的构建

发布时间：2018-03-21 11:00

本文选题：近场动力学　切入点：键　出处：《计算力学学报》2017年04期 　论文类型：期刊论文

【摘要】：近场动力学理论(PD)是基于非局部思想的连续介质力学新理论,用于研究材料破坏问题。根据准脆性材料破坏的线性和非线性的力学行为,在初始微观弹脆性材料(PMB)的本构力函数中引入了键的损伤模型,将键的断裂过程分成了线性的弹性变形阶段和非线性的损伤变形阶段,以此构建了准脆性材料的本构力函数的基本形式。以典型的准脆性材料为例构建了其本构力函数,通过在压缩载荷下对含预制不同角度单裂纹缺陷的类岩材料的裂纹扩展进行PD数值模拟仿真,裂纹起裂位置和扩展方向与试样试验结果在一定程度上保持了一致,证明了该基于近场动力学理论的典型准脆性材料的本构力函数可用于该类材料的破坏分析。
[Abstract]:The near field dynamics theory (PDD) is a new theory of continuum mechanics based on nonlocal thought, which is used to study the failure problem of materials. According to the linear and nonlinear mechanical behavior of quasi-brittle materials, The bond damage model is introduced into the constitutive force function of the initial micro elastic brittle material (PMB). The fracture process of the bond is divided into linear elastic deformation stage and nonlinear damage deformation stage. The basic form of constitutive force function of quasi-brittle material is constructed, and the constitutive force function of quasi brittle material is constructed by taking typical quasi-brittle material as an example. Through PD numerical simulation of crack propagation in rock-like materials with prefabricated single crack defects at different angles under compression loading, the crack initiation position and propagation direction are consistent with the test results to some extent. It is proved that the constitutive force function of the quasi brittle material based on the near field dynamics theory can be used for the failure analysis of this kind of material.
【作者单位】：贵州大学机械工程学院;
【基金】：贵州省留学人员科技活动(黔人项目资助合同[2014]13号) 贵州省联合基金(黔科合LH字[2014]7624号)资助项目
【分类号】：O341

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