用动光弹法研究瞬态表面载荷的破坏作用

Dynamic Photoelastic Analysis of Breakage Action of Transient Contact Loads

应用动光弹实验方法,研究了表面爆炸载荷作用在半无限弹性介质边界时,在其内部激发的动态应力场,井着重分析比较了单边集中药包和双边对称药包爆炸两种载荷条件下,在有限板块内形成的瞬态应力分布的差异。结果表明:当使用相同药量时,对称布置药包可在板块内某些部位造成应力集中从而导致板块更易于破裂。

By using dynamic photoelatic method, the dynamic stress field in semi-infinite elastic medium due to contact explosive loading was studied. More emphasis was placed upon the comparison of the transient stress distributions in a finite plate under two kinds of loading conditions: charges concentra ted on one side of the plate and charges symmetrically placed on two opposite sides of the plate. The test results indicated that when using same amount of charges, symmetrically placed charges could stimulate stress concentrations in certain parts of the plate and therefore cause the plate to fracture.