为了更加准确的评价导弹结构的承载能力,对塑性垮塌载荷方法在结构强度分析中的应用进行研究。根据真实弹塑性应力应变关系建立材料本构模型,采用弹塑性有限元方法进行分析,并从得到的位移载荷结果确定垮塌载荷。以某导弹折叠翼面为对象进行了具体计算,静力试验验证了该方法的准确性。结果表明,采用塑性垮塌载荷对折叠翼面承载能力进行评价比采用最大应力更加准确。

In order to evaluate the bearing capacity of missile structure more accurately, the application of plastic collapse load in structural strength analysis was studied. Based on the stress-strain relationship of real elastoplasticity, a constitutive model of the material was established, and the elastic-plastic finite element method was used to analyze the model and the collapse load was determined from the displacement load results. Taking a missile folding wing surface as an object, the concrete calculation was carried out, and the accuracy of the method was verified by static test. It was concluded that using plastic collapse load method to evaluate the bearing capacity of folding wing surface was more accurate than using the maximum stress method.