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一、前言现代飞机为了在安全的条件下达到提高强度、减轻重量、提高性能、节约能源等目的,在设计的基本概念上引用了在设计上允许有损坏的观点。这种观点被称为损坏安全结构或称为允许有损坏的设计。也就是即使在任何一个结构的主要部件上产生裂纹,而其余的结构仍能承受极限载荷;或者是由于机体材料上存在的缺陷和不能检查的裂纹之作用下造成裂纹扩展,而在航空运输期间裂
I. INTRODUCTION In order to improve the strength, reduce the weight, improve the performance and save the energy under the condition of safety, the modern aircraft cites the concept of allowable damage in the basic concept of design. This view is known as damaging the security structure or as allowing for damaging designs. That is to say, even if cracks are formed on the main components of any one structure and the rest of the structure can still withstand the ultimate load, or crack propagation is caused by defects in the material of the body and cracks which can not be inspected, crack