文献类型：期刊文献

英文题名：Extended constant life diagrams for low cycle fatigue and creep-fatigue assessments of high-temperature structures

作者：Ma, Zhiyuan[1];Fu, Zhuojia[1,2];Chen, Haofeng[3,4];Wang, Xiaoxiao[3];Barbera, Daniele[5]

机构：[1]Hohai Univ, Coll Mech & Mat, Ctr Numer Simulat Software Engn & Sci, Nanjing 211100, Peoples R China;[2]Leibniz Univ Hannover, Inst Continuum Mech, D-30167 Hannover, Germany;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety DOE, Shanghai 200237, Peoples R China;[4]Univ Strathclyde, Dept Mech & Aerosp Engn, Glasgow G1 1XJ, Scotland;[5]Univ Strathclyde, Adv Forming Res Ctr, Glasgow PA4 9LJ, Renfrow, Scotland

年份：2024

卷号：308

外文期刊名：ENGINEERING STRUCTURES

收录：;EI(收录号：20241615925354);WOS:【SCI-EXPANDED(收录号:WOS:001236109600001)】；

基金：The authors gratefully acknowledge the supports from the National Natural Science Foundation of China (52150710540, 52375145) , the National Key R & D Program of China (2023YFF0614903) , Hohai University, East China University of Science and Technology and University of Strathclyde during the course of this work.

语种：英文

外文关键词：Creep; Low cycle fatigue; Constant life diagram; Direct methods; Finite element analysis

摘要：Over the decades, the constant life diagram has become an important tool for engineering design and assessment. For specific materials, the effect of mean stress and stress amplitude on the fatigue life is considered in traditional constant life diagrams. In this study, the concept of the structural constant creep-fatigue life diagram is proposed for engineering structures subjected to cyclic loads in high-temperature environments. By integrating constant fatigue and creep-fatigue life curves into the traditional Bree diagram, we offer an efficient and reliable approach that enables quick determination of structural life and corresponding failure mechanisms. To provide a one-stop solution for the evaluation of constant fatigue/creep-fatigue life curves, an extended Unified Procedure for Fatigue and Ratchet Analysis (eUPFRA) has been proposed based on the Linear Matching Method (LMM) framework. Case studies on engineering components have also been performed with consideration of the cyclic hardening effect, temperature-dependent material properties and various damage models. The impact of the target life and creep dwell time is further investigated, as well as the creep-fatigue interaction mechanism. Verification against ABAQUS step-by-step inelastic analysis has finally been conducted, confirming the precision and efficiency of the eUPFRA.