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动载作用下复合型裂纹扩展的近场动力学模拟
Peridynamic study on mixed-mode crack propagation under dynamic load
投稿时间:2017-06-08  修订日期:2017-07-10
DOI:
中文关键词:  复合型裂纹  裂纹扩展  近场动力学  非局部模型  动力破坏
英文关键词:Mixed-mode crack  crack propagation  peridynamics  non-local model  dynamic failure
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
钱剑 河海大学工程力学系 hhu_qianjian@foxmail.com 
姜冬菊 河海大学工程力学系  
龚庆 重庆市质量和标准化研究院  
黄丹 河海大学 danhuang@hhu.edu.cn 
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中文摘要:
      构建改进的非局部近场动力学模型和粒子系统动力加载算法,开展复合型裂纹动力扩展过程模拟。在常规近场动力学微极模型中引入能反映非局部长程力尺寸效应的核函数修正项以提高计算精度和收敛稳定性。通过模拟动载作用下含复合型裂纹混凝土三点弯梁的裂纹扩展与破坏过程并与试验结果对比,验证了本文模型和算法的可靠性。在此基础上,通过分组模拟分析了动载作用下初始裂纹的位置、长度和方向对含复合型裂纹三点弯梁破坏模式、起裂时间与承载能力的影响规律。
英文摘要:
      An improved nonlocal peridynamic model and corresponding dynamic loading algorithms for particle system has been proposed to simulate mixed-mode crack propagation subjected to dynamic load. A kernel function which could describe the internal length effect of long-range forces was introduced into the regular microploar peridynamic model in order to improve the calculation accuracy and stability. The model was validated by analyzing the failure of a single-notched three-point bending concrete beam subjected to dynamic load and comparing the simulation results with experiments. Further investigation was taken into the effect of the location and orientation of the crack on the failure mode, cracking time and failure load of the three-point bending beam with pre-existed mixed-mode crack and subjected to dynamic load.
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