鸟撞平板试验与鸟体本构参数识别方法

Test of bird striking on panel and identification method for bird constitutive parameters

准确可靠的鸟体本构模型与参数是开展结构抗鸟撞分析和设计的基础。为获取鸟体本构参数,在139m/s的速度下,开展鸟体撞击铝合金薄板试验,并测得了撞击载荷、平板变形和应变数据;结合ISIGHT和PAM-CRASH软件,以薄板被撞击位置的法向变形为优化目标,提出一种鸟体本构参数识别方法。将识别得到的参数代入数值模型并开展数值分析,提取平板变形结果和撞击载荷数据,并与试验测试数据进行比较。结果表明,平板变形仿真结果与试验数据具有很好的一致性,撞击载荷分析结果与试验数据基本一致,证明了本文所建立的鸟体本构参数识别方法的有效性。

Accurate and reliable constitutive and dynamic parameters are the foundation of the structural anti-bird impact design and analysis.To obtain bird constitutive parameters,tests of bird striking on the thin aluminum alloy panel at the velocity of 139 m/s are carried out to measure the impact load,panel displacement and strain.An optimization method for identifying bird constitutive parameters using ISIGHT and PAM-CRASH is proposed,and displacement on the panel center is treated as the optimization objective.A numerical simulation is conducted with the optimized parameters being substituted into the numerical model.Comparison of the test and numerical analysis results shows that the displacement acquired by two different ways presents good consistency,and the impact load acquired by two different ways agrees largely with each other.The identification method for bird constitutive parameters proposed in this paper is proved to be effective and reasonable.