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以0.4 mm厚的316L不锈钢板为上、下面板,采用加压烧结技术制备直径35 mm、厚10 mm的不锈钢纤维夹芯板;不锈钢纤维多孔芯体的孔隙度为66%～95%,纤维丝径5～200μm。利用分离式霍普金森压杆(SHPB)试验装置研究具有不同芯体的夹芯板的冲击压缩行为。结果表明:高应变速率引起应力滞后,高孔隙度或者不锈钢纤维直径较大的夹芯板应力滞后现象有所缓解;烧结不锈钢纤维夹芯板是1种应变率敏感材料,随着应变率增加,应力滞后现象更明显;在相同的冲击速率下,随着孔隙度增加,夹芯板动态压缩时应力随应变增加而增大的趋势加大。在相同应变下,低孔隙度样品的应力较大。
A stainless steel fiber sandwich panel with a diameter of 35 mm and a thickness of 10 mm was prepared by using a 0.4 mm-thick 316L stainless steel plate as the upper and lower panels. The porosity of the stainless steel fiber porous core was 66% -95% Wire diameter 5 ~ 200μm. The impact compression behavior of sandwich panels with different cores was investigated using a split Hopkinson pressure bar (SHPB) test setup. The results show that the stress hysteresis of the sandwich panel with stress lag, high porosity or larger diameter of stainless steel fibers is alleviated. Sintered stainless steel fiber sandwich panel is a strain rate sensitive material. With the increase of strain rate, The stress lag phenomenon is more obvious. With the increase of porosity, the stress increases with the increase of strain at the same impact rate. Under the same strain, the stress of low porosity samples is larger.