让压管材料特性参数敏感度正交试验研究

Orthogonal Experimental Study on Sensitivity of Yielding Tube Material Characteristic Parameters

针对让压管各材料特性参数对让压效果影响不明确现象,选取让压管壁厚、钢材牌号、中鼓直径、直管段总长度4个因素3个水平进行数值模拟试验,通过正交试验法来研究让压管材料特性参数对让压动载系数的敏感程度。试验结果表明:4个材料特性参数敏感程度从大到小分别是:壁厚>中鼓直径>钢材牌号>直管段总长度;不同参数对让压动载系数表现出较大差异性,随着壁厚和中鼓直径增大,让压动载系数增大,让压效果减弱;钢材牌号与直管段总长度对让压动载系数的影响相反,随着参数增大,让压动载系数减小,让压效果增强。

In view of the phenomenon that the material characteristic parameters of the yielding tube have no clear influence on the yielding effect,four factors and three levels,including wall thickness,steel grade,medium drum diameter and straight pipe length of the yielding tube,are selected to carry out the orthogonal numerical simulation tests,the sensitivity of the material property parameter of the yielding tube to the dynamic yielding load factor was studied by orthogonal test.The experimental results show that:the sensitivity degree of the four material property parameters from big to small is wall thickness>medium drum diameter>steel grade>straight pipe length.With the increase of the wall thickness and the medium drum diameter,the dynamic yielding load factor increases and the yielding effect weakens.while the steel grades and the straight pipe length have the opposite effect on the dynamic yielding load factor,and with the increase of the parameters,the influence of the steel grade and the straight pipe length on the dynamic yielding load factor is opposite,and with the increase of the parameters,the coefficient of dynamic yielding load is reduced and the effect of pressure is enhanced.