摘要
为了研究圆柱壳体在侧压作用下的强度损伤机理,采用近场动力学数值方法对其强度损伤的萌生、扩展演化过程进行仿真分析.首先,对键基近场动力学理论进行了回顾.考虑到该模型中长程力对计算精度的影响,引入核函数对其进行改进,建立了适用于求解三维问题的改进型键基近场动力学模型.其次,将最大应变准则作为评估键断裂与否的标准嵌入改进的模型中.采用FORTRAN语言编程实现了单调递增侧压作用下壳体强度损伤行为的数值仿真.最后,对仿真结果进行分析,揭示强度损伤演化规律.仿真结果表明:损伤区最先出现在壳体内壁面,且呈90°均匀分布;随着压力的增加,壳体的外壁面上出现两个新的损伤区,随后内壁面和外壁面上的损伤区同时向壳体中面扩展;在整个损伤演化过程中,壳体的损伤程度随载荷的线性增加而呈指数形式增长.该方法能为壳体在复杂载荷作用下的强度预测和防护提供指导.
To study the strength damage mechanism of cylindrical shell under lateral pressure,the initiation,propagation and evolution of shell strength damage were simulated by peridynamics numerical method.Firstly,the bond-based peridynamic(BPD)theory was reviewed.Considering the influence of long-range forces on the calculation accuracy of BPD model,a kernel function was introduced into the model,and an improved BPD model suitable for solving three-dimensional problems was established.Secondly,the maximum strain criterion was embedded into the improved model as assessment standard for bond break.The numerical simulation of strength damage behavior under monotonically increasing lateral pressure was realized by FORTRAN programming.Finally,the damage evolution process was analyzed.Simulation results show that the initiation damage zones originate from the inner wall of the shell and are evenly distributed at 90°.As the pressure increases,two new failure zones occur in the outer wall of the cylinder,and then the failure zones in the inner and outer walls propagates toward to the middle surface of the cylinder.During the whole damage evolution process,the failure degree of shell behaves exponential growth with the pressure linear increase.The established model can provide guidance for the strength prediction and protection of cylinder under complex loads.
作者
蒋雷雷
沈克纯
潘光
黄毅华
JIANG Leilei;SHEN Kechun;PAN Guang;HUANG Yihua(School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第3期105-112,共8页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(52101376)
中央高校基本科研业务费专项资金资助项目(3102019JC006)。
关键词
近场动力学
圆柱壳体
强度
渐进损伤
侧压
peridynamics
cylindrical shell
strength
progressive damage
lateral pressure
作者简介
蒋雷雷(1994-),男,博士研究生;通信作者:沈克纯,副教授,E-mail:shenkechun@126.com.
