倾角对含气膜孔镍基单晶试件的蠕变损伤影响的数值模拟（英文）

发布时间：2018-03-01 01:21

本文关键词： 单晶高温合金气膜孔倾角蠕变损伤　出处：《稀有金属材料与工程》2015年11期 　论文类型：期刊论文

【摘要】：针对含不同倾角气膜孔的镍基单晶试件的蠕变损伤发展进行了数值模拟,研究了倾角对蠕变特性的影响。气膜孔的倾角分别为0°,15°,30°和45°。结果表明,倾角不同,气膜孔周围的分切应力分布也不同。当倾角为0°,15°和30°时,裂纹扩展方向为θ=±54°,而当倾角为45°时,裂纹沿着θ=±46°的方向进行扩展。倾角为30°的试件有最长的失效寿命。在气膜孔周围的高应力区,分切应力、Mises等效应力和沿拉伸方向的应力σ_(11)均出现了应力松弛现象,且随着时间的延长,应力都达到了稳定值。此外,倾角也影响着蠕变损伤的分布,当倾角为0°,15°,30°和45°时,最大损伤点分别出现在与水平方向成0°,0°,13°和26°的位置。
[Abstract]:In this paper, the creep damage development of nickel base single crystal sample with different dip angles is simulated, and the influence of dip angle on creep characteristics is studied. The inclination angle of gas film hole is 0 掳15 掳30 掳and 45 掳respectively. The results show that the dip angle is different. The distribution of shear stress around the gas film hole is also different. When the inclination angle is 0 掳, 15 掳and 30 掳, the crack propagation direction is 胃 = 卤54 掳, and when the dip angle is 45 掳, the crack propagation direction is 0 掳卤54 掳, and when the dip angle is 45 掳, the crack propagation direction is 卤54 掳. The crack propagates along the direction of 胃 = 卤46 掳. The specimen with a dip angle of 30 掳has the longest failure life. In the high stress region around the gas film hole, the stress relaxation phenomenon occurs in the high stress region around the gas film orifice, i.e., the shear stress Mises equivalent stress and the stress 蟽 _ (11) along the tensile direction. In addition, the angle of inclination also affects the distribution of creep damage. When the dip angle is 0 掳, 15 掳, 30 掳and 45 掳, the maximum damage point appears in the position of 0 掳0 掳0 掳and 26 掳respectively.
【作者单位】：西北工业大学;
【基金】：National Natural Science Foundation of China(51175424,51210008) NPU Foundation for Fundamental Research(JC201238,JC201239)
【分类号】：TG146.15

【相似文献】