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research-article

The Linear Matching Method Framework for Structural Integrity Assessment

[+] Author and Article Information
Daniele Barbera

Department of Mechanical & Aerospace Engineering University of Strathclyde, Glasgow, G1 1XJ, UK
daniele.barbera@strath.ac.uk

Haofeng Chen

Department of Mechanical & Aerospace Engineering University of Strathclyde, Glasgow, G1 1XJ, UKSchool of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
haofeng.chen@strath.ac.uk

Yinghua Liu

Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China
yhliu@mail.tsinghua.edu.cn

Fuzhen Xuan

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
fzxuan@ecust.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4036919 History: Received January 05, 2017; Revised May 23, 2017

Abstract

The Linear Matching Method Framework (LMMF) consists of a number of simplified direct methods for generating approximate inelastic solutions and answering specific design related issues in pressure vessel design and assessment codes using standard finite element codes. This paper presents a detailed review and case study of the latest state-of-the art LMM direct methods applied to the structural integrity assessment. Different structural integrity aspects are covered including the calculation of shakedown, ratchet, creep rupture limits, low cycle fatigue and creep fatigue damages. Finally an overview of the in house developed LMM plug-in is given, presenting the intuitive Graphical User Interface developed. The efficiency and robustness of these direct methods in calculating the aforementioned quantities are confirmed through a numerical case study, which is a semi-circular notched (Bridgman notch) bar. A 2D axisymmetric finite element model is adopted, and the notched bar is subjected to both cyclic and constant axial mechanical loads. For the crack initiation assessment, different cyclic loading conditions are evaluated to demonstrate the impact of the different load types on the structural response. The impact of creep dwell is also investigated to show how this parameter is capable of causing in some cases a dangerous phenomenon known as creep ratcheting. All the results in the case study demonstrate the level of simplicity of the LMMs but at the same time accuracy, efficiency and robustness over the more complicated and inefficient incremental finite element analyses.

Copyright (c) 2017 by ASME
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