裂纹扩展增量对裂纹扩展稳定性影响的研究
Study on the Influence of Crack Growth Increment on Crack Growth Stability
- 2022年52卷第3期 页码:65-71
收稿:2021-09-03,
修回:2021-11-12,
纸质出版:2022-03-30
DOI: 10.7512/j.issn.1001-2303.2022.03.09
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收稿:2021-09-03,
修回:2021-11-12,
纸质出版:2022-03-30
移动端阅览
在实际的裂纹扩展仿真分析中需要确定三个主要参数,包括局部裂纹扭转角度、局部裂纹扩展增量以及扩展后裂纹尖端的拟合外伸,而对于裂纹扩展增量往往根据计算结果精度的需求来确定其大小,忽略了裂纹扩展增量对裂纹扩展稳定性的影响。针对这一问题,利用FRANC3D和Abaqus软件联合仿真分析计算了Q235钢CT试样在不同裂纹扩展增量情况下的裂纹扩展特点,并根据裂纹尖端应力强度因子的分布情况得出两点结论:(1)裂纹两端接近结构自由表面,两端趋向于平面应力状态,中间内部裂纹处于平面应变状态,导致应力强度因子SIF呈现中间大、两端小的对称分布,使得在较大裂纹扩展增量的情况下裂纹中部与两端的扩展值差异较大,最终导致裂纹凸凹扩展甚至失稳;(2)在进行裂纹扩展分析时,为保证计算精度和节约计算时间,并且保证裂纹扩展的稳定性,裂纹扩展增量选取为当前裂纹尖端单元特征尺寸的15%~30%比较合适。
In an actual crack extension needs to determine three main parameters in the simulation analysis
including local crack torsion Angle
local crack growth increment and expanded fitting overhang of the crack tip
and for the crack growth increment is often according to the requirements of the precision of the calculation results to determine its size
ignoring the effect of crack growth increment on the stability of crack propagation. To solve this problem
FRANC3D and Abaqus software were used to analyze and calculate the crack growth characteristics of Q235 steel CT sample under different crack growth increments
and two conclusions were drawn according to the distribution of stress intensity factor at the crack tip: (1) on both ends of the crack near free surface structure
both ends of trend surface stress state
intermediate internal crack in the plane strain state
the stress intensity factor SIF presents small symmetry distribution on both ends of the large
middle
made in the case of large crack growth increment at the ends of the central crack and extension value differences
eventually lead to crack the concavo-convex extension even instability; (2) In the analysis of crack growth
in order to ensure the calculation accuracy
save calculation time and ensure the stability of crack growth
it is appropriate to select 15%~30% of the characteristic size of the current crack tip element for the increment of crack growth.
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