含初始裂纹巴西圆盘劈裂问题的非局部近场动力学建模

发布时间：2018-05-14 06:14

  本文选题：巴西圆盘 + 劈裂　； 参考：《固体力学学报》2017年06期

【摘要】：采用近场动力学方法对巴西圆盘劈裂破坏问题进行建模分析.在非局部键型近场动力学(Peridynamics,PD)理论基础上,通过引入物质点对的转动自由度构建双参数微观弹脆性近场动力学本构模型以突破常规模型的应用范围限制,并考虑岩石混凝土类固体材料的宏观拉压异性和断裂特征.引入动态松弛、粒子系统力边界条件和平衡收敛准则等算法,构建了完备的PD求解体系.实现了含不同倾角中心裂纹巴西圆盘受压劈裂破坏全过程的近场动力学数值模拟,裂纹扩展路径及破坏形式均与试验结果高度吻合.进一步分析了初始中心裂纹倾角及其相对长度对巴西圆盘破坏荷载的影响.
[Abstract]:A near-field dynamic method is used to model and analyze the splitting failure of Brazilian disc. On the basis of the theory of nonlocal bond type near-field dynamics, a two-parameter micro-elastic-brittle near-field dynamic constitutive model is constructed by introducing the rotational degrees of freedom of point pairs of matter in order to break through the application limits of the conventional model. The macroscopic tensile and compressive characteristics and fracture characteristics of rock concrete solid materials are considered. A complete PD solution system is constructed by introducing dynamic relaxation, particle system force boundary conditions and equilibrium convergence criteria. The near field dynamic numerical simulation of the whole process of fracture of Brazilian disk with different dip angle crack under compression is carried out. The crack propagation path and failure form are in good agreement with the experimental results. The influence of the initial central crack inclination and its relative length on the failure load of Brazilian disc is further analyzed.
【作者单位】： 河海大学工程力学系;
【基金】：国家自然科学基金(11132003,51679077和51209079) 中央高校基本科研业务费(2015B18314) “NSFC-广东联合基金(第二期)超级计算科学应用研究专项” 国家超级计算广州中心资助
【分类号】：TU45
，

本文编号：1886673