A novel method for residual strength prediction for sheets with multiple site damage: Methodology and experimental validation

被引：19
作者：
Xu, Wu [1 ,3 ]
Wang, Hai [1 ]
Wu, Xueren [1 ,2 ]
Zhang, Xiaojing [1 ]
Bai, Guojuan [1 ]
Huang, Xianglong [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Aeronaut & Astronaut, Shanghai 200240, Peoples R China
[2] AVIC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
[3] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA
来源：
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES | 2014年 / 51卷 / 3-4期
关键词：
Multiple site damage; Residual strength; Stable crack growth; Crack tip opening angle criterion; Strip yield model; Plastic zone size; Weight function method; ALUMINUM PANELS; INFINITE SHEET; CRACKS; FRACTURE; JOINTS;
D O I：
10.1016/j.ijsolstr.2013.10.012
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
A unified method for solving the strip yield model for collinear cracks in finite and infinite sheet is proposed. The method is based on the weight function of a single crack. Two collinear cracks in finite and infinite sheets are used to apply and verify this method. The plastic zone size, crack opening displacement and stress distribution along the ligament between cracks obtained by using the present method are extensively compared with existing available results and finite element solutions, and very good agreements are observed. Combined with the Crack Tip Opening Angle (CTOA) criterion, the unified method is used to predict the crack growth behavior and residual strength for 2024-T3 aluminum alloy sheet with Multiple Site Damage (MSD). Thirty-two sheets with four types of MSD are designed and tested to verify this method. It is shown that the present method is able to predict various crack growth behaviors observed in experiment. The predicted residual strengths are within 9% of the corresponding test results. Compared to the elastic-plastic finite element method, the present method is much more efficient. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：551 / 565
页数：15
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