考虑变形硬化的管道塑性弯曲屈曲临界应变预测

为了正确评估管道弯曲屈曲的临界应变，在考虑变形硬化对管道塑性弯曲的影响的基础上，对基于截面椭圆化模型的管道塑性弯曲屈曲的临界应变评估方法进行改进，提出一个考虑变形硬化的管道塑性弯曲屈曲的临界应变预测方法。其中，管道材料的应变硬化属于Hollomon类型。此外，使用文献中的测试数据对所提出的表达式进行了检验。结果表明，所提出的预测表达式能够合理地揭示应变硬化行为对管道塑性弯曲时临界屈曲应变的影响，为预防管道弯曲屈曲导致的基于强度的管道设计失效提供帮助。

Prediction for Pipeline Plastic Flexural Buckling Critical Strain under Deformation-hardening

In order to correctly evaluate the pipeline plastic flexural buckling critical strain，considering the influence of deformation-hardening on pipeline plastic bending，the critical strain evaluation method of pipeline plastic flexural buckling based on cross section ovalization model is improved，and a critical strain prediction method for pipeline plastic flexural buckling critical strain under deformation-hardening is proposed. The deformation-hardening of pipeline materials is Hollomon type，and the proposed expression was examined using the test data in the literature. The results show that the proposed predictive expression can reasonably reveal the influence of strain-hardening behavior on pipeline plastic flexural buckling critical strain，and provide help to prevent the failure of strength-based pipeline design caused by pipeline plastic flexural buckling.