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通过时45CrNiMoVA钢在K=1.92×10~4MPam~(1/2)/s下的动态断裂韧度K_(1d)和J=1.8～2.5×10~4N· mm~(-1)/s下的J_(1d)的测定,探讨了采用闭环回路电液伺服试验机测定动态断裂韧度的方法。在动态J_(1d)测试中采用了J_R阻力曲线法,在国内尚未见报导.刚定σ_(0.2)=1378MPa下的动态J_(1d)的结果令人满意。因此,对于一般中、低强度调质钢,利用J_R阻力曲线法浏定J_(1d)更是可能的。试验结果还表明:加荷速率(?)(?)对K_(1d)(J_(1d))的影响趋势与一般报导的Cr-Mo-V系钢是相似的。用此法测得结果对于加荷速度低于4毫秒的冲击加荷可提供安全分析的断裂韧度指标K_(1d)和J_(1d).
The dynamic fracture toughness K_ (1d) and J = 1.8 ~ 2.5 × 10 ~ 4N · mm -1 / s for 45CrNiMoVA steel at K = 1.92 × 10 ~ 4MPa ~ (1/2) Of the J_ (1d) determination, to explore the use of closed-loop loop electro-hydraulic servo testing machine dynamic fracture toughness method. In the dynamic J_ (1d) test using the J_R resistance curve method, has not been reported in the country.Just set σ_ (0.2) = 1378MPa dynamic J_ (1d) results are satisfactory. Therefore, for the general medium and low strength quenched and tempered steel, J_R resistance curve method J_ (1d) is more likely. The experimental results also show that the trend of loading rate (?) (?) On K_ (1d) (J_ (1d)) is similar to that of Cr-Mo-V steel. The results obtained using this method provide a safe analysis of fracture toughness K_ (1d) and J_ (1d) for impact loading at loading speeds below 4 ms.