Adding multi-material regions embracing the tip leads to significant capacity increase in structures weakened by V-notches under antiplane shear and torsion
Adding multi-material regions embracing the tip leads to significant capacity increase in structures weakened by V-notches under antiplane shear and torsion
复制标题
添加包围尖端的多材料区域可显着增加在反平面剪切和扭转下被 V 形切口削弱的结构的能力
DOI：
10.1016/j.ijsolstr.2022.111704
复制
发表时间：
2022
影响因子：
3.6
通讯作者：
Salviato, Marco
中科院分区：
文献类型：
--
作者：
Salviato, Marco
本文研究了如何在有限V形缺口尖端插入多材料圆形区域来降低反平面剪切或扭转结构的缺口应力强度因子(NSIF)。为了实现这一目标，本文提出了一种新的理论框架来计算闭合形式的应力分布和NSIF。通过调整多材料区域半径和弹性性质，可以显著降低材料界面的NSIF和应力集中。为了研究所提出的多材料体系是否在存在显著的非线性变形的情况下仍能提高结构的承载能力，采用非线性超弹性损伤和弹塑性损伤模型进行了计算模拟。初步结果表明，在结构刚度仅降低8%的情况下，结构承载能力提高46%，破坏时名义应变提高86%。预计类似的方法可以扩展到其他加载条件(例如，I型和II型，以及疲劳)，并且通过进行彻底的优化研究，可以获得更大的收益。
This study investigates how the insertion of multimaterial circular regions embracing the tip of a finite V-notch can be used to reduce the Notch Stress Intensity Factors (NSIFs) in structures subjected to antiplane shear or torsion. Towards this goal, this work presents a novel theoretical framework to calculate stress distributions and NSIFs in closed-form. Thanks to the new solution, it is shown that by tuning multimaterial region radii and elastic properties it is possible to significantly reduce the NSIFs and stress concentrations at the material interfaces.To investigate whether the proposed multimaterial system translates into increased structural capacity even in the presence of significant nonlinear deformations, computational simulations were conducted using nonlinear hyperelastic-damage and elasto-plastic-damage models. The preliminary results show increases of structural capacity up to 46% and of nominal strain at failure of up to 86% at the expenses of only a 8% reduction in structural stiffness.It is expected that a similar approach can be extended to other loading conditions (e.g. mode I and mode II, and fatigue) and that even larger gains can be obtained by performing thorough optimization studies.
用于曲线各向异性介质建模的等几何框架
影响因子：
6.3
作者：
Kenta Suzuki;Sean E. Phenisee;M. Salviato
通讯作者：
M. Salviato
原位应力状态对热固性聚合物及相关纤维增强复合材料塑性变形、断裂和尺寸缩放的影响
影响因子：
9.1
作者：
Yao Qiao;Qiwei Zhang;M. Salviato
通讯作者：
M. Salviato
影响因子：
4.1
作者：
Pastrello, Matteo;Salviato, Marco;Zappalorto, Michele
通讯作者：
Zappalorto, Michele