基于Tsai-Wu准则的复合材料补强板优化设计

Optimal Design of Composite Patch Stiffener Based on Tsai-Wu Theory

由于复合材料具有优良的抗疲劳性、耐腐蚀性和高比强度等优点,现代直升机机体中大量采用复合材料结构。科学合理地设计复合材料补强板能够有效提高机体结构的剩余强度,对直升机机体设计与修理工作具有重要意义。以三维Tsai-Wu破坏准则为依据,通过建立有限元模型并应用ANSYS软件,对铝合金含裂纹板件胶接修补模型进行了三维有限元建模与仿真计算。结果表明,含裂纹铝合金板通过复合材料补强修补后,能大大提高结构的破坏载荷,且当复合材料补强板与基板的刚度比为1.4~1.8时,补强结构破坏载荷最大。

Composite has been widely used in modern helicopter body because of it＇s excellent anti-fatigue,corrosion resistance and high specific strength and so on.Through scientifically designing composite patch stiffener,the helicopter body residual intensity can be effectively enhanced,and it is meaningful for helicopter body design and repairing work.Taking the three dimensional Tsai-Wu failure criterion as gist,through building finite element model,and the aluminum base plate with crack bonded by composite patch was simulated and the result strength was computed by using ANSYS platform.The result showed that the cracked aluminum plate bonded by composite patch can greatly improve its fracture load,and the bonded structure can get the maximum fracture load when the stiffness ratio of composite patch stiffener to base plate was between1.4 and 1.8.