含单边缺口混凝土梁冲击破坏的近场动力学模拟

发布时间：2018-04-28 19:18

本文选题：近场动力学 + 改进的PMB模型　；参考：《工程力学》2016年12期

【摘要】：改进了近场动力学(peridynamics,PD)微观弹脆性(prototype microelastic brittle,PMB)模型中微观模量的计算方法,解决了PMB模型的"边界效应"问题。利用改进的PMB模型计算了冲击荷载作用下单边缺口混凝土梁的破坏全过程,得到了混合型裂纹扩展的角度、路径以及裂尖最大速度,并与试验和其他数值方法模拟结果进行了对比分析,验证了改进的PMB模型的有效性。研究结果表明,近场动力学方法在模拟破坏问题时不存在网格依赖性,其本构模型自然包含了损伤与断裂的描述,是求解结构冲击破坏问题的一种有效方法。
[Abstract]:The calculation method of microscopic modulus in the prototype microelastic brittle- PMBmodel of near-field dynamics is improved, and the "boundary effect" problem of the PMB model is solved. The whole failure process of one-sided notched concrete beams under impact load is calculated by using the improved PMB model. The angle, path and maximum velocity of crack tip are obtained. The effectiveness of the improved PMB model is verified by comparing with the experimental and other numerical simulation results. The results show that the near-field dynamic method has no mesh dependence in simulating the failure problem, and its constitutive model naturally includes the description of damage and fracture, which is an effective method to solve the structural impact failure problem.
【作者单位】：河海大学工程力学系;
【基金】：国家自然科学基金项目(11372099,11132003,51179064) 国家科技支撑计划项目(2015BAB07B10) 江苏省自然科学基金项目(BK20151493) 江苏省高校研究生创新基金项目(KYLX_0420)
【分类号】：TU37;TU311.3

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