摘要
基于弹性梁理论,对局部失效缺陷下的二级层级褶皱结构失效机理进行了分析.通过对原结构体系和局部失效后新结构体系的受力分析,归纳总结了结构的六种失效模式.根据各失效模式之间的占优关系绘制了失效机理图,讨论了参数l_(1)/l、θ和α对失效机理图的影响,并基于特定失效序列优化约束,给出了结构轻量化优化列式.通过数值仿真,验证了局部失效后二级层级褶皱结构失效预测的正确性和层级失效序列设计思路的可行性.最后采用3D打印模型进行了验证实验,实验结果与理论解吻合较好.
Based on the elastic beam theory,the failure mechanism of hierarchical corrugated structure with a second-order core under local failure defects was studied.Firstly,through the force analysis of the original structural system of the hierarchical corrugated structure with a second-order core and the structural system under local failure defects,six failure mechanisms of the structure were obtained,and the corresponding nominal force expressions of each failure mechanism were given.Then the failure mechanism diagram was drawn according to the dominant relationship between the failure mechanisms.The influences of parameters l_(1)/l,θ and α on the failure mechanism diagram were discussed.At the same time,taking the corresponding nominal force of each failure mechanism as the constraint and minimizing the amount of structural materials(relative density) as the optimization objective,the optimization formula for lightweight structure was given according to the optimization design of specific failure sequences.Finally,some numerical simulations and experiments were given to verify the correctness of the prediction of failure for the corrugated hierarchical structure with a second-order core after local failure and the feasibility of the design of the hierarchical failure sequence.It is found that the changes of different parameters lead to different failure modes of the structure,and the occurrence of the failure mode on the secondary transfer path member of the hierarchical corrugated structure cannot necessarily be used as the failure criterion of the structure.Only when the structural failure mode appears on the main transfer path member,the failure mode can be used as the failure criterion of the structure,and the hierarchical corrugated structure can be used as the failure criterion of the structure according to the loss caused by the occurrence of each failure mode.It can be obtained that the relatively benign failure transfer path sequence of the structure is as follows:the first secondary transfer path component failure,and then the main transfer path component failure.The results of this paper can accurately grasp the change law of hierarchical corrugated structure and the structural failure mechanism under local failure defects,and provide theoretical value for engineering applications.
作者
方耀楚
吴文涛
叶涛
倪康
唐寿康
孙冰
肖潇
Yaochu Fang;Wentao Wu;Tao Ye;Kang Ni;Shoukang Tang;Bing Sun;Xiao Xiao(School of Civil Engineering,University of South China,Hengyang,421001;Hunan Provincial Key Laboratory of High Performance Special Concrete,Hengyang,421001;China Nuclear Construction Key Laboratory of High Performance Concrete,Hengyang,421001)
出处
《固体力学学报》
CAS
CSCD
北大核心
2021年第6期656-670,共15页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金面上项目(51678286)
湖南省自然科学基金项目(2018JJ3438)
湖南省教育厅重点项目(20A426)
研究生创新项目(203YXC014)资助。
关键词
层级褶皱结构
缺陷
失效机理
验证实验
仿真模拟
hierarchical corrugated structure
defect
failure mechanism
verification experiment
simulation
作者简介
通讯作者:方耀楚.Tel:15307470488,E-mail:55579813@qq.com.
