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波音787飞机的机身蒙皮采用全复合材料,对于复合材料机身蒙皮的修理,波音787结构维修手册给出了明确的修理方案,其中包括复合材料机身蒙皮的钛合金板铆接修理。然而,对维修方案背后的理论依据,即强度、刚度等力学特性要求没有叙述。基于此,本文对复合材料机身蒙皮的钛合金板铆接修理建立了两种维修的三维有限元模型,分析了这两种维修方案母板、补片和填平板的应力大小和应力分布特性。研究表明:复合材料机身蒙皮大的穿透型裂纹钛合金板铆接修理能够满足静强度要求,两种维修方案的钛合金补片破坏源发生在不同位置。
The fuselage of the Boeing 787 fuselage with all composite materials, for the repair of composite body skin, Boeing 787 structural repair manual gives a clear repair program, including the composite body skin titanium plate riveting repair . However, the theoretical basis behind the maintenance scheme, that is, the mechanical properties such as strength and stiffness are not described. Based on this, two kinds of maintenance three-dimensional finite element models are established for the riveting repair of the titanium alloy plate of the skin of the composite body, and the stress magnitude and stress distribution characteristics of the two kinds of maintenance schemes of the mother plate, the patch and the filling plate are analyzed . The research shows that the rivet repair of large penetrating crack titanium alloy plate can meet the requirement of static strength, and the damage of titanium alloy patch in two maintenance schemes occurs at different positions.