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在分离式Hopkinson压杆(SHPB)上做了铜基粉末冶金摩擦材料在102s-1～103s-1应变率范围内的冲击试验,弹速范围为4m/s～15m/s,在透射杆上采用了半导体应变片技术;在MTS实验机上做了该材料在10-4s-1～10-3s-1应变率范围内的准静态实验,分别在应变为0 005,0 010,0 020,0 035时卸载再加载,以验证材料的黏弹塑性特征.通过分析动态和静态实验曲线,发现该材料在应变率300s-1和准静态时有应变硬化效应,但在应变率500s-1以上却反映出应变软化效应,因此该材料为含损伤非线性黏弹塑性材料.该结论可推广应用于类似烧结合金的材料,实验给出的 Receiveddate:2003-08-21 Foundationitem:ItissupportedbyChinaAcademyofEng.PhysicsFund(421010201);OutstandYoungFundofHe′nanProvince;Im portantIndustryProjectofHe′nanProvince(03230239000) Authorbiography:LIUJian＿xiu(1962—),female,wasborninHongtongCounty,ShanxiProvince,Professor,ZhengzhouInst.ofLightInd.,ChinaAcademyofEng.PhysicsDr.,themainresearchinterestwascomputationalMech.andEng.dynamics. 第1期LIUJian xiuetal:MechanicalpropertyofCu＿basepowdermetallurgyfrictionmaterialunderimpactload·15· 该材料动态和静态数据,为工?
The impact test of Cu-based powder metallurgy friction material in the range of 102s-1 ~ 103s-1 strain rate was performed on a split Hopkinson pressure bar (SHPB) with a projectile speed ranging from 4m / s to 15m / s on the transmission rod The semiconductor strain gauge technology was adopted. The quasi-static experiment of the material in the strain rate range of 10-4s-1 ~ 10-3s-1 was done on the MTS test machine. When the strain was 0 005,0 010,0 020,0 035 to verify the viscoelasto-plastic character of the material.Through the analysis of dynamic and static experimental curves, it is found that the material has a strain hardening effect at a strain rate of 300 s-1 and a quasi-static strain but at a strain rate of 500 s-1 or more Which reflects the strain softening effect, so this material is a non-linear viscoelastic plastic material with damage.This conclusion can be generalized and applied to similar sintered alloy materials, given experimentally Received: 2003-08-21 Foundationitem: ItissupportedbyChinaAcademyofEng.PhysicsFund (421010201) (03230239000) Authorbiography: LIUJian_xiu (1962 -), female, was borninHongtongCounty, ShanxiProvince, Professor, ZhengzhouInst.ofLigh tInd., China Academy myEng.PhysicsDr., themain research interestswascomputationalMech.andEng.dynamics. Issue 1 LIUJian xiuetal: MechanicalpropertyofCu_basepowdermetallurgyfrictionmaterialunderimpactload · 15 · The material dynamic and static data,