In order to make clear how the longitudinal defects affect a long bone, a mechanical model of a femur mid-diaphysis with a rectangular defect in the exterior cortex is developed.

为研究临床上开窗对长骨力学性质的影响，建立了一个股骨中段的外侧皮质带有矩形缺损的力学模型；

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Several quality defect are studied when thin-walled tubular parts with longitudinal inner rib is spinning, phenomenon of oval port, superficial peel-off and pilling are interpreted.

在此基础上，进一步分析了带纵向内筋的筒形件旋压件时出现的几种质量缺陷，对椭圆形端口、表面鳞状剥离现象和隆起进行了解释说明。

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Analyses the cause for the crack resulting from the non-fusion in the longitudinal weld seam of a power plant boiler cylinder, and suggests corrective actions to eliminate the defect.

针对一台电站锅炉锅筒纵焊缝未融合引起的裂纹进行分析，并提出缺陷修复的办法。

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