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Analysis of the Fuselage Structure for Multi Site Damage

机译:机身结构多部位损伤分析

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The current study includes a panel which represents the fuselage splice joint. The fuselage splice joint is a location where it experiences the uniform stress field at many rivet locations in a row. The probability of fatigue cracks initiation at many rivet locations simultaneously is more at splice joint. This paper has relevance in the structural integrity evaluation of aging transport aircrafts structural segment due to multisite damage.Finite element analysis of the Fuselage segment will be carried out to obtain the stress distribution near the joint. Fatigue cracks will emanate from the rivet holes simultaneously as they experience identical stresses due to internal pressure. In service the cracks in the fuselage will grow due to pressurization loading cycle (the difference in internal pressure and the atmospheric pressure at various altitudes). This study reveals the failure mechanics of the net section between the two advancing crack tips.There are two competing mechanism of failure; Failure due to fracture and Failure due to net section yielding (plastic collapse). The mode of failure will depend on which of the above two occurs at a lower load. The stress intensity factor calculations are carried out by using Modified Virtual Crack Closure Integral (MVCCI) method. The stress analysis is done using Nastran & Patran. The results were in compatible.
机译:当前的研究包括代表机身拼接接头的面板。机身拼接处是连续在多个铆钉位置承受均匀应力场的位置。在多个铆钉位置同时发生疲劳裂纹的可能性在接头处更高。本文对多点损伤引起的老化运输机结构段的结构完整性评估具有重要意义。对机身段进行有限元分析,得到接头附近的应力分布。疲劳裂纹将同时从铆钉孔中散发出,因为它们会由于内部压力而承受相同的应力。在使用中,由于加压加载周期(内部压力和不同高度的大气压力之差),机身中的裂纹会增加。本研究揭示了两个前进裂纹尖端之间网段的破坏机理。断裂导致的失效和净截面屈服(塑性塌陷)导致的失效。故障模式将取决于上述两种情况中的哪一种在较低的负载下发生。应力强度因子的计算是使用改进的虚拟裂纹闭合积分(MVCCI)方法进行的。使用Nastran和Patran进行应力分析。结果是兼容的。

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