线性缓冲材料对质量块撞击下的弹性杆动态屈曲影响研究

针对刚性质量块撞击情况，对弹性直杆在线性缓冲材料防护下的动态屈曲进行分析，得到撞击条件下杆体屈曲发生的临界弹簧刚度。以杆体整个长度发生轴向应变的最小弹性屈曲载荷为判据，分析了临界弹簧刚度与载荷作用时间、载荷幅值、缓冲材料及杆体长度的关系，以及缓冲材料位置对于杆体屈曲防护的影响等。结果表明：撞击初速和刚性块质量是引起临界弹簧刚度改变的两个因素，缓冲材料的安放位置在一定条件下影响着弹性杆屈曲防护。所得结论对于在刚性质量块作用下弹性直杆的动态屈曲防护问题提供了一定的理论依据。

Study on the influence of the elastic rod dynamic buckling under block impact

According to impact of rigid quality piece , it analyzes the dynamic buckling of elastic rod under the linear buffer material protection , obtains the critical spring stiffness under the condition of buckling rod body . Based on the criterion of elastic buckling load about the minimum axial strain of rod body , it builds the relation-ships between the critical spring stiffness and the load time , load amplitude , buffer material and the length of rod, buffer material position and buckling rod protection .The main factors to change the critical spring stiffness are the impact velocity and quality of rigid block .The placement of buffer material can affect the elastic rod buckling protection under certain conditions .The result provides the theory basis for influence analysis of the e-lastic rod dynamic buckling under block impact .