Quantitative prediction of brittle crack arrest toughness based on microstructural information of steel by model synthesis

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14410
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: The University of Tokyo
• Principal Investigator: Shibanuma Kazuki 東京大学, 大学院工学系研究科(工学部), 准教授 (30611826)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 破壊力学 / 脆性破壊 / アレスト靭性 / 劈開破壊 / マルチスケール

Outline of Final Research Achievements

A multiscale model was developed by the model synthesis approach to integrate (a) a model to simulate microscopic cleavage crack propagation, (2) a model of finite element analysis, and (c) macroscopic brittle crack propagation, as the first attempt to clarify the relationship between microstructures of steel and macroscopic brittle crack arrest toughness. In addition, two kinds of experiments were conducted in order to improve the accuracy of the developed model; (i) DCB tests to evaluate dependence of cleavage crack arrest toughness on grain size, and (ii) micro-scale tests to evaluate an effect of distance between cleavage planes on absorbed energy during tear-ridge forming.

Free Research Field

工学