Quantitative evaluation of fracture toughness deterioration due to Pre-strain

•Conversion method considering pre-strain direction is proposed.•Fracture toughness tests were performed to investigate pre-strain effect.•Fracture toughness decreases by half or more by 1% LC strain. Previous studies presented the fracture toughness evaluation values decrease due to pre-strain by l...

Full description

Saved in:
Bibliographic Details
Published in:Engineering fracture mechanics 2022-09, Vol.272, p.108683, Article 108683
Main Authors: Ozawa, Takumi, Kawabata, Tomoya, Mikami, Yoshiki
Format: Article
Language:English
Subjects:
CTOD
Fracture toughness
Local compression
Numerical analysis
Pre-strain
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Conversion method considering pre-strain direction is proposed.•Fracture toughness tests were performed to investigate pre-strain effect.•Fracture toughness decreases by half or more by 1% LC strain. Previous studies presented the fracture toughness evaluation values decrease due to pre-strain by local compression. However, it was not possible to distinguish whether the cause was fracture toughness deterioration or poor crack front shape straightness due to a bowing crack front at low strain. The authors applied pre-strain without affecting the crack front shape and conducted fracture toughness tests showing that 1% pre-strain reduces fracture toughness by 50%. Furthermore, we investigated the effect of the pre-strain direction on fracture toughness, and proposed a method for converting longitudinal pre-strain to thickness direction strain and demonstrated its effectiveness.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2022.108683