DH-36钢的塑性流动统一本构关系研究

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Study of plastic flow unified constitutive relation for steel DH-36

School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China

摘要: 通过对DH-36钢动态应变时效的规律和试验数据进行系统分析, 发展和建立了描写第3种动态应变时效的本构模型. 然后基于热激活物理概念本构模型和塑性流动应力组合原理, 加入对第3种动态应变时效的描述, 获得了统一本构模型. 该模型不仅可以描写第3种动态应变时效, 还可以预测DH-36钢在温度77K~1000K, 应变率0.001s^{-1}~3000s^{-1}范围内的塑性流动应力,通过比较发现统一本构模型预测结果与试验结果吻合很好.
- 应变率
Abstract: Through systematically analysing the dynamicstrain aging behaviour and the testing data of structural steel DH-36, theconstitutive model of the third-type dynamic strain aging has beendeveloped. Then based on thermal-activated physical concept constitutivemodel and the combinatorial principle of plastic flow stress, a unifiedconstitutive model is finally obtained with the description for thethird-type dynamic strain aging. This model not only can describe thethird-type dynamic strain aging phenomenon, but also the mechanicalbehaviour of DH-36 steel in a wide range of temperatures(77~1000K) and strain rates(0.001~3000s^{-1}). There is a good agreementbetween theoretical predictions and experimental results.
- Strain-rate