# Reverse bend experiments on the base plate and discussion of the appropriate amount of reverse bending for precrack straightness (Effect of the reverse bend process on the CTOD toughness evaluation and understanding of its mechanisms)

https://mdr.nims.go.jp/datasets/7de37f5b-f0f5-4a61-b06c-4058fcf35d01

## File

- [1-s2.0-S0167844225000278-main.pdf](https://mdr.nims.go.jp/filesets/c2a904ce-3ddf-483f-91be-c92a1a93243c/download) ([Detail](https://mdr.nims.go.jp/filesets/c2a904ce-3ddf-483f-91be-c92a1a93243c.md))

## Id

7de37f5b-f0f5-4a61-b06c-4058fcf35d01

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-07-16T05:00:09.751072Z

## Updated at

2025-09-01T07:30:20.523309Z

## Published at

2025-09-01T07:18:03.585176Z

## Doi



## First published url

https://doi.org/10.1016/j.tafmec.2025.104869

## Date published

2025-02-13

## Recorded date published

2025-6

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Reverse bend experiments on the base plate and discussion of the appropriate
    amount of reverse bending for precrack straightness (Effect of the reverse bend
    process on the CTOD toughness evaluation and understanding of its mechanisms)
  title_type: original
  lang: en

## Description

- description: Measurements of the critical value of the crack-tip opening displacement
    (CTOD) of welded joints often suffer from weld residual stresses, which prevent
    the introduction of a straight precrack front. In this study, the effects of reverse
    bending, a proven method for straightening the crack front shape, on evaluations
    of the critical CTOD are investigated. To compare the differences in the evaluation
    results, the authors used a base plate without residual stress inside the material
    for their experiments. Five different reverse bending treatments were applied
    to a 50 mm thick base metal, and the effects of reverse bending were evaluated
    via CTOD tests at low temperatures. Additionally, numerical simulations were carried
    out via the finite element method to exclude the effects of a0/W and af, which
    cannot be unified in the experiments, and to understand the mechanism. After reverse
    bending and unloading, the tensile residual stress is distributed at the notch
    edge, and a high stress intensity at the fatigue crack tip during CTOD testing
    can be expected. In addition, when the amount of reverse bending is increased
    to Lr = 1.35, the compressive residual stress distribution in front of the specimen
    expands, and the P–Vg curve clearly decreases, which may impair the precrack shape
    flatness. Therefore, the controlled range of Lr should be at least less than 1.35.
  description_type: abstract
  lang: und

## Creator

- name: Tomoya Kawabata
  role: author
- name: Hoichi Kitano
  role: author
  orcid: https://orcid.org/0000-0002-0778-574X
  organization: National Institute for Materials Science
- name: Takumi Ozawa
  role: author
- name: Yoshiki Mikami
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: CTOD
  schema: not_defined
- subject: Standard
  schema: not_defined
- subject: " Reverse bend"
  schema: not_defined
- subject: Weibull stress
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Theoretical and Applied Fracture Mechanics
  issn: '01678442'
  volume: '137'
  article_number: '104869'

## Conference



## Related item



## Funding

- funder_name: Japan Society for the Promotion of Science

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: c2a904ce-3ddf-483f-91be-c92a1a93243c
  filename: 1-s2.0-S0167844225000278-main.pdf
  content_type: application/pdf
  size: 9475081
  md5: 1e4670579afee471a23d0559f89e20db

## Thumbnail

fileset_id: c2a904ce-3ddf-483f-91be-c92a1a93243c
filename: 1-s2.0-S0167844225000278-main.pdf