Influence of Material, Mechanical, and Environmental Factors on the Fracture Mechanism of Metals under Hydrogen Environments

2014 Fiscal Year Final Research Report

• Project/Area Number: 23686022
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Materials/Mechanics of materials
• Research Institution: Kyoto University
• Principal Investigator: MATSUMOTO Ryosuke 京都大学, 工学(系)研究科(研究院), 助教 (80363414)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 破壊 / 塑性 / 分子動力学 / 第一原理計算 / 水素脆化 / 格子欠陥 / ひずみ計測 / 金属

Outline of Final Research Achievements

It is important to predict the mechanical behavior of metals under hydrogen environments for the safe usage of hydrogen. In this study, we investigated the influences of material, mechanical, and environmental factors on the fracture mechanism of metals by the use of both analytical and experimental approaches. Major achievements are as follows: (a)The dominant hydrogen effect changes depending on the boundary conditions. (b)The mechanisms which increase the concentration of lattice defects were revealed. (c)The plastic-strain rate at localized area is rapidly increased immediately prior to fracture initiation by hydrogen.

Free Research Field

機械材料・材料力学，材料強度学，計算力学