摘要
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。
Light metal fibrous core sandwich panel was prepared by pressure sintering with the thickness of 0.4 mm 316L stainless steel panel and the diameter of 5～200 μm fibers.The porosity of sintered fibrous core was varied between 66% and 95%.The dynamic compressive behavior of the sandwich sheet with different sintered porous core was explored with a Split HOPKINSON Pressure Bar（SHPB） testing system.The experiment results indicated that higher strain rate led to the stress lag,the stress lag slowed down with higher porosity and larger diameter fibers.Moreover the sandwich structure of sintered metal fibrous core was one of the materials sensitive to strain rate.With the strain rate increased,stress lag was more obvious.At the same impact rate,the stress of the sandwich panels with high porosity increased more sharply than lower porosity.Meanwhile,at the same strain,stress increased with the porosity of sintered metal fibrous core decreased.
出处
《粉末冶金材料科学与工程》
EI
2010年第4期378-381,共4页
Materials Science and Engineering of Powder Metallurgy
基金
国家重点基础研究发展规划(973计划)资助项目(2006CB601201B)
陕西省自然科学基金资助项目(2009JM6005)
