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通过试验、理论分析和有限元模拟对工业纯钛TA2室温蠕变条件下裂纹尖端应力应变场的参量表征及估算进行了研究。试验研究表明,在室温条件下,工业纯钛TA2存在明显的第1阶段蠕变现象。理论分析和有限元模拟表明,对TA2裂纹体进行保载时,裂纹尖端的应力应变场为HRR场,提出采用与时间相关的J积分来表征,并给出了估算方法。通过有限元计算,获得了TA2室温蠕变条件下CT试样的时间相关J积分值,论证了采用J积分来表征室温蠕变条件下TA2裂纹尖端应力应变场的合理性。将有限元计算与估算方法获得的J积分进行了比较,验证了估算方法的有效性和准确性。
Through the experiment, theoretical analysis and finite element simulation, the parametric characterization and estimation of the crack tip stress-strain field under the room temperature creep condition of industrial pure titanium TA2 were studied. Experimental studies show that at room temperature, industrial pure titanium TA2 obvious first stage creep phenomenon. The theoretical analysis and finite element simulation show that the stress-strain field at the tip of the crack is the HRR field when the TA2 crack body is under load, and the time-dependent J-integral is proposed to characterize it and the estimation method is given. The finite element method was used to obtain the time-dependent J-integral of the CT specimen under creep at room temperature TA2. The rationality of using the J-integral to characterize the stress-strain field at the TA2 crack tip under creep at room temperature was demonstrated. The J integral obtained by the finite element method and the estimation method are compared to verify the validity and accuracy of the estimation method.