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Low-velocity impact and post-impact biaxial residual strength tests and simulations of composite laminates

机译：复合材料层压板的低速冲击和冲击后双轴残余强度测试和模拟

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摘要

The failure and biaxial residual strength after low-velocity impact of composite laminates are very important in the service and maintenance of aero-engine. In this paper, cruciform structure and cruciform structure with slots were designed and used for impact WA and post-impact biaxial tensile test, respectively. Experimental results showed that damage evolutions under biaxial loading vary greatly for different impact energies. Subsequently, a full process analysis method for low-velocity impact damage and biaxial residual strength of composites was proposed and used to simulate the low-velocity impact damage and biaxial residual strength. The comparisons between the simulation results and tests showed that the maximum error of the impact projection area and biaxial residual strength is less than 10%, proving the accuracy of the simulation results and the rationality of the full process analysis method developed in this paper. M last, the biaxial strengthening effect and the effects of impact energy on the biaxial residual strength were analyzed. The simulation results showed that (1) T300/QY8911 composite laminates has the property of biaxial strengthening effect; (2) There are two thresholds of impact energies for the post-impact biaxial residual strength, which are located in the ranges from 7.5-J to 10-J and from 15-J to 17.5-J, respectively.
机译：复合材料层压板在低速冲击后的破坏和双轴残余强度在航空发动机的维修和保养中非常重要。本文设计了十字形结构和带槽的十字形结构，分别用于冲击WA和冲击后双轴拉伸试验。实验结果表明，在不同载荷下，双轴载荷下的损伤演化差异很大。随后，提出了复合材料低速冲击损伤和双轴残余强度的全过程分析方法，并用于模拟低速冲击损伤和双轴残余强度。仿真结果与试验结果的比较表明，冲击投影面积和双轴残余强度的最大误差均小于10％，证明了仿真结果的准确性和所开发的全过程分析方法的合理性。最后，分析了双轴增强作用和冲击能量对双轴残余强度的影响。仿真结果表明：（1）T300 / QY8911复合材料层合板具有双轴增强作用。 （2）冲击后双轴残余强度有两个阈值，分别位于7.5-J至10-J和15-J至17.5-J的范围内。

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