首先利用电液伺服加载试验机对单束钢绞线在(10 -3~10 -1s-1)应变率范围内进行动态力学拉伸试验;然后根据实验数据,分析了不同应变率对屈服强度的影响规律;并对我国设计规范中用于硬钢类材料简化计算的Ramberg-Osgood本构模型进行修正,以获得可以更好地描述钢绞线动态拉伸应力-应变关系的本构模型.研究表明,单束钢绞线的应变率越大,其屈服应变和极限应变越小,屈服强度越大.修正后的Ramberg-Osgood本构模型能够较好地描述钢绞线动态拉伸应力-应变关系;并且随着应变率的增大,钢绞线的硬化指数减小,残余应变增大.%Firstly,dynamic tensile test of single strand of steel strand is carried out in the strain range(10 -3~10 -1s-1) by using electro-hydraulic servo loading test machine,and then according to the experimental data,the law of the effect of strain rate on the yield strength of steel material was analyzed,and used to simplify the calcula-tion of Ramberg-Osgood constitutive model is modified in China Design code in order to obtain a description. The dynamic tensile steel strand can better be constitutive model of stress-strain relationship. Research shows that the single beam steel wire strain rate increases and the yield strain and ultimate strain is small, the yield strength is higher;the modified Ramberg-Osgood constitutive model can describe the dynamic tensile steel strand good stress-strain relationship,and with the increase of strain rate, strain hardening exponent steel wire decreases, residual strain increase.
展开▼
