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结果表明，搬手头内六方处的裂纹，是尖角效应引起应力集中而产生的应力集中裂纹；
The results show that the crack of the department within the six-party of the move-on-hand is caused by stress concentration on the acute angle effect.
结果表明，尖角效应引起的应力集中和热处理淬火加热温度偏高是导轨端面产生裂纹的主要原因。
The results show the stress concentration caused by acute angle effect and the high temperature are the primary cause of producing crack.
采用镜像法理想涡模型分析了地面效应对翼尖涡位置和气流下洗角的影响；
Image method ideal vortex model is used for the analysis of how ground effect impacts wingtip vortex and airflow downwash angle.
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