较低应变率大应变条件下聚氨脂泡沫材料的动态力学性能实验

Experimental study on dynamic properties of polyurethane foam subjected to large strains and low strain rates

利用加长型分离式霍普金森压杆(入射杆长6 000mm、子弹长800 mm)研究聚氨脂泡沫材料在较低应变率大应变条件一维应力状态下的动态力学性能,获得了约550μs的长加载脉冲,得到了该材料在应变率520 s-1、应变0.15条件下的应力应变曲线,对较低应变率条件下,应变率与动态应力平衡之间的关联进行了讨论。

Dynamic compression tests for polyurethane foam were performed on an elongated split Hopkinson pressure bar setup,the incident bar of which was six meter long and the striker was eight decimeter long.A pulse shaper was used to achieve the dynamic balance in the stresses at the two sides of the specimens.About 600-microsecond pulses were experimentally obtained and the stress-strain curves of polyurethane foam were attained at the strain rate of 520 s-1 and the strain of 0.15.And the discussions were carried out for the relation of strain rate and stress balance at the two sides of the specimens.