摘要
采用Python语言对ABAQUS进行二次开发，实现了对无人机机翼肋板裂纹扩展的模拟。试验将机翼肋板简化为二维平板结构，在肋板与梁的连接处放置裂纹，模拟不同初始角度的裂纹的扩展过程。结果表明：裂纹的扩展形态、扩展过程中的应力强度因子和裂纹扩展角的变化规律，与裂纹的初始角度有密切的关系；可分为两种情况：当裂纹初始角度为50°-70°时，裂纹沿着初始方向向前扩展，不发生方向的改变；当裂纹初始角度为-70°-40°时，裂纹最终向着翼肋的下表面扩展。该结果对研究机翼肋板裂纹的止裂以及裂纹扩展速率等有一定的参考价值。
Crack propagation of UAV wing＇s ribs has been simulated by ABAQUS secondary development using Python language. In the study, the wing rib is reduced to two-dimensional slab structure, the crack is placed at the connection of the beam and rib, and the crack propagation process of different initial angle is simulated. The results have been obtained, that crack propagation morphology, variation of stress intensity factor in the expansion process and crack propagation angle, has close relationship with the crack location and initial crack angle. Crack propagation morphology can be divided into two kinds generally, one is along the initial direction when the initial crack angle between 50°and 70°, another is crack towards the lower surface of rib ultimately when the initial crack angle between -70° and 40°. The results have a certain reference value on crack growth rate and crack arrest of the wing ribs.
出处
《失效分析与预防》
2014年第2期94-99,120,共7页
Failure Analysis and Prevention
关键词
机翼肋板
二次开发
裂纹扩展
应力强度因子
ABAQUS
wing ribs
ABAQUS
secondary development
crack propagation
stress intensity factor
