金属构件疲劳裂纹扩展:数值模拟与解析解

IF 2.2 4区工程技术 Q2 ENGINEERING, CIVIL

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI:10.12989/SEM.2021.79.5.541

Danilo D’Angela, M. Ercolino

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引用次数: 2

摘要

本文提出了采用有限元分析和解析解法模拟金属致密拉伸试样疲劳裂纹扩展的新方法。在ABAQUS中采用扩展有限元法(XFEM)结合直接循环低周疲劳法(LCF)进行有限元分析。通过对分析结果的处理，提出了裂纹扩展数值计算的新方法。结合以往的实验数据，对数值模拟进行了验证。对疲劳寿命评估的解析解进行了正式评述，并定义了新的疲劳损伤描述符。通过参数化研究，广泛评估了主要试样/试验特征对数值和解析疲劳寿命的影响。研究了构件疲劳寿命的数值计算与解析计算之间的差异，并将其与试验/建模的特点联系起来。最后提出了一种基于统计的修正因子，以增强解析解。

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Fatigue crack growth in metallic components: Numerical modelling and analytical solution

The paper presents innovative approaches for the simulation of fatigue crack growth (FCG) in metallic compact tension (CT) specimens using finite element (FE) analysis and analytical solution. FE analysis is performed in ABAQUS using the extended finite element method (XFEM) coupled with the direct cyclic low-cycle fatigue (LCF) approach. Novel methods are developed for the computation of the numerical crack growth by processing the analysis outputs. The numerical modelling is validated by considering past experimental data. The analytical solution for the fatigue life evaluation is formally reviewed, and novel fatigue damage descriptors are defined. The influence of the main sample/testing features on numerical and analytical fatigue life is extensively assessed by a parametric study. The discrepancy between the numerical and analytical estimations of the fatigue life of the components is investigated and correlated to the features of the testing/modelling. A statistical-based correction factor is finally proposed in order to enhance the analytical solution.

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来源期刊

Structural Engineering and Mechanics 工程技术-工程：机械

CiteScore

3.80

自引率

18.20%

发文量

审稿时长

11 months

期刊介绍： The STRUCTURAL ENGINEERING AND MECHANICS, An International Journal, aims at: providing a major publication channel for structural engineering, wider distribution at more affordable subscription rates; faster reviewing and publication for manuscripts submitted; and a broad scope for wider participation. The main subject of the Journal is structural engineering concerned with aspects of mechanics. Areas covered by the Journal include: - Structural Mechanics - Design of Civil, Building and Mechanical Structures - Structural Optimization and Controls - Structural Safety and Reliability - New Structural Materials and Applications - Effects of Wind, Earthquake and Wave Loadings on Structures - Fluid-Structure and Soil-Structure Interactions - AI Application and Expert Systems in Structural Engineering. Submission of papers from practicing engineers is particularly encouraged.