不锈钢纤维多孔材料的准静态压缩性能

Quasi-static compressive performance of porous stainless steel fiber materials

以直径为■8,20μm的316L不锈钢纤维毛毡为原料,通过烧结工序制备了孔隙率为64.3%~89.3%的不锈钢纤维多孔材料,采用INSTRON测试仪测试了其准静态压缩性能,利用Vic-3D非接触应变测试仪获得了材料的静态压缩应力应变曲线,利用高速摄像机拍摄了材料的静态变形过程,系统分析了孔隙率、纤维直径、材料厚度对多孔材料弹性模量和能量吸收值的影响规律。研究表明不锈钢纤维多孔材料的准静态压缩应力应变曲线分为3个阶段,即弹性变形阶段、弱变形强化阶段和强变形强化阶段。随着孔隙率的降低,多孔材料的弹性模量和能量吸收值逐渐增加,其弹性模量和能量吸收值最大分别达到542 MPa和27.7 MJ/m^3(孔隙率为64.3%)。

Porous stainless steel fiber materials with porosities ranging from 64.3%to 89.3%were prepared by sintering using 316L stainless steel fiber green felts with fiber diameters of 8 and 20μm.The quasi-static compressive property of porous stainless steel fiber materials was tested using the INSTRON machine and the stress-strain curves were obtained using the Vic-3D non-contact strain tester.The deformation process was recorded using the high speed vidicon.Effects of the porosity,the fiber diameter,the thickness on the elastic modulus and the energy absorption capacity of porous stainless steel materials were studied systematically.Results show that the quasi-static compressive stress-strain curve of porous stainless steel fiber materials exhibits three unobvious regions,i.e.,the elastic deformation stage,the strengthing stage with weak deformation and the strengthing stage with strong deformation.Furthermore,the elastic modulus and the energy absorption capacity increase constantly as the porosity of porous materials decreases.When the porosity of porous materials is 64.3%,the elastic modulus and the energy absorption capacity are 542 MPa and 27.7 MJ/m 3,respectively.