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| Finite element simulation of fatigue crack growth of MSD with multiple collinear holes on finite plate |
| ZHAO Jin-Fang1, XIE Li-Yang1, LIU Jian-Zhong2, LI Bing1 |
1.School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110004, China;
2.Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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Abstract The basis steps of a 2D crack analysis finite element software FRANC2D/L in simulating fatigue crack growth was introduced and this software was utilized to simulate the process of fatigue crack growth of center holeedge cracks on finite plate. Comparing the simulation curves with the experimental data, the two results agree well, which proves the reliability of this method in simulating fatigue crack growth. By employing FRANC2D/L in simulating fatigue crack growth of MSD with multiple collinear holes on finite plate, the relationship curve between length of each hole-edge crack and fatigue growth life is obtained. The simulation result shows that, under the same circumstance, the fatigue growth life of center hole-edge crack on finite plate is much higher than the one of center hole-edge crack in MSD structure; the fatigue growth lives of each hole-edge crack in MSD structure are different because they have suffered different effects. In addition, the paper also presents the process of fatigue crack growth of multiple MSD cracks without and with main crack. The result shows that the coalescence behavior tends to happen in MSD cracks with main crack and then lends to destruction of the structure．
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Published: 28 August 2009
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有限板共线多孔MSD疲劳裂纹扩展有限元模拟
介绍了二维断裂分析有限元软件FRANC2D/L在疲劳裂纹扩展模拟方面的基本步骤．利用该软件对有限板中心孔边对称裂纹的疲劳裂纹扩展进行模拟计算,对比模拟结果和试验数据,发现两者吻合良好,证明了利用该方法模拟疲劳裂纹扩展的可靠性．将FRANC2D/L应用到有限板共线多孔MSD疲劳裂纹扩展的有限元模拟上,得到了各孔边裂纹的长度和疲劳扩展寿命之间的关系曲线．模拟计算结果表明,在相同条件下,有限板中心孔边对称裂纹的裂纹扩展寿命要远远高于MSD结构中中心孔边裂纹的疲劳扩展寿命；由于MSD结构中影响各孔边裂纹的因素有所差异,各条裂纹的疲劳扩展寿命也会有所不同．另外,还给出了不含主裂纹的MSD和含主裂纹的MSD两种情况下的疲劳裂纹扩展历程,通过比较得知,含主裂纹的MSD结构更容易发生裂纹的合并和贯穿致使结构发生破坏．
关键词：
FRANC2D/L,
有限板共线多孔MSD,
疲劳裂纹扩展,
有限元模拟
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