一种激光焊接金属夹芯结构界面疲劳裂纹开裂的数值方法
By establishing a metal sandwich structure model in ABAQUS finite element software and developing the UMAT subroutine for the cyclic cohesive force model, the fatigue crack initiation and propagation of laser-welded metal sandwich structures were simulated. This solved the problem of unpredictable fatigue damage in existing technologies and improved the safety and reliability of the structures.
CN117494507BActive Publication Date: 2026-07-17DALIAN UNIV OF TECH +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DALIAN UNIV OF TECH
- Filing Date
- 2023-11-01
- Publication Date
- 2026-07-17
Smart Images
Figure CN117494507B_ABST
Abstract
本发明公开了一种激光焊接金属夹芯结构界面疲劳裂纹开裂的数值方法，包括以下步骤：S1：建立激光焊接金属夹芯复合结构的有限元模型；S2：在连接界面处布置内聚力单元；S3：施加疲劳载荷，并对内聚力单元调用编制的疲劳损伤UMAT子程序计算；S4：提取内聚力单元在计算过程中的各损伤变量并绘制损伤曲线图；S5：提取金属夹芯复合结构在疲劳加载过程中的裂纹长度，绘制出疲劳裂纹长度‑载荷循环次数曲线。本发明的有益效果为：能够模拟激光焊接金属夹芯复合结构连接界面处疲劳裂纹萌生与扩展行为，分析其疲劳寿命。
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