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Fatigue crack growth suppressing method for bent portion of metal sheet, and automotive part
US2025041924A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025041924-A1 |
| Application number | US-202218716790-A |
| Country | US |
| Kind code | A1 |
| Filing date | Aug 18, 2022 |
| Priority date | Dec 17, 2021 |
| Publication date | Feb 6, 2025 |
| Grant date | — |
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- Title
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Abstract
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A fatigue crack growth suppressing method for a bent portion of a metal sheet suppresses growth of a fatigue crack in the bent portion obtained by bending the metal sheet. The fatigue crack growth suppressing method includes generating a compressive residual stress by applying plastic strain at least within a range from a bending start point to a bending end point on an inside of a bend of the bent portion, at an interval of less than a sheet thickness of the metal sheet in a valley line direction of the bent portion, in a direction orthogonal to the valley line direction.
First claim
Opening claim text (preview).
1 . A fatigue crack growth suppressing method for a bent portion of a metal sheet for suppressing growth of a fatigue crack in the bent portion obtained by bending the metal sheet, comprising generating a compressive residual stress by applying plastic strain at least within a range from a bending start point to a bending end point on an inside of a bend of the bent portion, at an interval of less than a sheet thickness of the metal sheet in a valley line direction of the bent portion, in a direction orthogonal to the valley line direction. 2 . The fatigue crack growth suppressing method for a bent portion of a metal sheet according to claim 1 , wherein the compressive residual stress is generated by forming an indentation band including a series of indentations, on the inside of the bend of the bent portion through needle peening using an impact pin, and a radius of curvature of a tip portion of the impact pin in a cross-section orthogonal to the valley line direction is equal to or less than a radius of curvature of the bent portion. 3 . An automotive part comprising: a bent portion obtained by bending a metal sheet, the bent portion being suppressed in growth of a fatigue crack; and an indentation band including a series of indentations obtained by needle peening using an impact pin in a direction orthogonal to a valley line direction, the indentation band being positioned at least within a range from a bending start point to a bending end point on an inside of a bend of the bent portion, and the indentations being provided at an interval of less than a sheet thickness of the metal sheet along the valley line direction of the bent portion.
Assignees
Inventors
Classifications
Recycling · CPC title
by shot-peening or the like · CPC title
between rams and anvils or abutments · CPC title
for making peculiarly, e.g. irregularly, shaped articles · CPC title
Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming (forging hammers B21J7/00) · CPC title
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- What does patent US2025041924A1 cover?
- A fatigue crack growth suppressing method for a bent portion of a metal sheet suppresses growth of a fatigue crack in the bent portion obtained by bending the metal sheet. The fatigue crack growth suppressing method includes generating a compressive residual stress by applying plastic strain at least within a range from a bending start point to a bending end point on an inside of a bend of the …
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification B21D5/006. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Feb 06 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).