温度对高应变率扭拉复合加载下形状记忆合金本构关系影响的研究

THE EFFECT OF TEMPERATURE ON THE CONSTITUTIVE RELATION OF Fe-BASE SHAPE MEMORY ALLOY UNDER TORSION-TENSION COMBINED HIGH STRAIN-RATE

利用分离式扭 拉复合加载Hopkinson杆装置 ,在 2 0℃和 50 0℃下研究了温度对高应变率扭 拉复合加载下铁基形状记忆合金本构的影响 .试验结果表明 :该材料在高应变率扭 拉复合加载下的名义剪切屈服强度、剪切强度极限和名义拉伸屈服极限、拉伸强度极限均随温度的升高而降低 .拉伸和扭转之间具有相互藕合作用 .

With a split Hopkinson torsion tension combination bar apparatus, the effect of temperature on the constitutive relations of Fe base shape memory alloy under torsion tension combined high strain rate is studied at temperatures 20℃ and 500℃. The experimental results show that 0.2% yield shear stress, ultimate shear stress and 0.2% yield tensile stress, ultimate tensile stress under torsion tension combined high strain rate decrease with increasing temperature. It is also found that there is a coupling between tension and torsion.