| Kagome平面格栅结构的屈服面及裂尖塑性区分析 |
| |
| 引用本文： | 钱岳强,邱信明,张雄. Kagome平面格栅结构的屈服面及裂尖塑性区分析[J]. 力学学报, 2008, 40(6): 826-833. DOI: 10.6052/0459-1879-2008-6-2007-109 |
| |
| 作者姓名： | 钱岳强 邱信明 张雄 |
| |
| 作者单位： | 清华大学航天航空学院清华大学航天航空学院清华大学航天航空学院 |
| |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
| |
| 摘 要： | 分析了Kagome格栅的等效刚度和屈服面. 其屈服面奇异，由4段直线围成. 利用该屈服面，估算了Kagome具有I型、II型半无限大裂纹的裂尖塑性区，有限元计算验证了解析预测的准确性. 与奇异屈服面相比，由Mises光滑屈服面给出的塑性区误差较大. 因此只有弹性情况，可以将Kagome等效为各向同性；若材料塑性，或应力场奇异性较强，Kagome的强度依赖于主应力方向，不能用各向同性模型来描述.
|
| 关 键 词： | 塑性力学 断裂 Kagome 裂尖 各向异性 |
| 收稿时间： | 2007-03-06 |
ANALYSIS OF YIELD SURFACE AND CRACK TIP PLASTIC ZONE OF KAGOME LATTICE STRUCTURE |
| |
| Qian Yueqiang , Qiu Xinming , Zhang Xiong. ANALYSIS OF YIELD SURFACE AND CRACK TIP PLASTIC ZONE OF KAGOME LATTICE STRUCTURE[J]. chinese journal of theoretical and applied mechanics, 2008, 40(6): 826-833. DOI: 10.6052/0459-1879-2008-6-2007-109 |
| |
| Authors: | Qian Yueqiang Qiu Xinming Zhang Xiong |
| |
| Affiliation: | Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China |
| |
| Abstract: | Effective stiffness and yield surface of Kagome latticestructure are investigated in the paper. The shape function of singularyield surface is a convex domain in the plane enclosed within four straightlines. The plastic zone of crack tips of mode I and mode II cracks in theinfinite half plane are estimated with the singular yield surface andvalidated with finite element simulation, which are more precise than thosewith Mises smooth yield surface. Thus Kagome could be simplified asisotropic continuum only in elastic deformation; meanwhile, in the case ofmaterial yielding or the strong singular stress field, the strength ofKagome lattice depends on the direction of principal stress. |
| |
| Keywords: | |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《力学学报》浏览原始摘要信息 |
|
点击此处可从《力学学报》下载全文 |
