Method for determining bending fracture in metal plate, program, and storage medium

一种弯曲断裂、判定方法的技术，应用在使用施加稳定的弯曲力测试材料强度、仪器、电数字数据处理等方向，能够解决危险性高等问题

Active Publication Date: 2016-01-27
NIPPON STEEL CORP
View PDF8 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when the strain in the deformation process obtained from the simulation reaches the limit strain specified by the fracture limit line, it is judged to be fractured or the risk of fracture is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining bending fracture in metal plate, program, and storage medium
  • Method for determining bending fracture in metal plate, program, and storage medium
  • Method for determining bending fracture in metal plate, program, and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0040] (basic idea)

[0041] When a metal plate made of a metal material is bent and deformed, the tensile stress in the circumferential direction decreases and the compressive stress in the radial direction increases from the outside of the material to the inside of the bend, and these stresses change in magnitude and stress state as the bending progresses. However, since the stress and strain generated by bending are not distributed equally in the plate thickness direction, the local necking condition applied under the uniform distribution cannot be applied. Since the local necking condition for the same distribution cannot be applied to the fracture judgment of the curved part, the fracture judgment of the curved part based on molding simulation and impact simulation which has been widely used until now cannot obtain sufficient practical reliability.

[00...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A bending fracture limit stress [sigma]cr is calculated for each bending radius R at plate thickness center / initial plate thickness t0 of a metal plate. A fracture limit stress [sigma]1_pl under plane strain deformation is calculated, as is a fracture limit line L1 in a uniform deformation state in a stress space for which a static strain rate is assumed from work hardening characteristics obtained from uniaxial tensile testing of the material constituting the metal plate. A determination is made of the ratio [gamma] between the bending fracture critical stress [sigma]cr and the plane strain fracture limit stress [sigma]1_pl in a uniform deformation state that corresponds to the R / t0 of a determination subject element in the metal plate. The ratio [gamma] is multiplied by the stress component of the fracture limit line L1, whereby a fracture limit line L2 corresponding to R / t0 is calculated. The maximum principal stress [sigma]OBcr of the determination subject element is calculated from the maximum principal stress [sigma]OR of the determination subject element and the fracture limit line L2 corresponding to R / t0 in a stress mode. A risk ratio [sigma]OR / [sigma]OBcr, which is the risk ratio for tensile bending fracture, is calculated from the sizes of the stress [sigma]OR and the fracture limit stress [sigma]OBcr. Fracture is determined for the determination subject element on the basis of the risk ratio [sigma]OR / [sigma]OBcr.

Description

technical field [0001] The invention relates to a bending fracture prediction method, program and storage medium of a metal plate. More specifically, the present invention relates to bending of a metal plate for judging the risk of bending fracture of the metal plate in a forming process of stamping a body part of an automobile or during collision deformation of a body part of an automobile Fracture judging method, program and storage medium. Background technique [0002] In recent years, due to the requirements of crash safety and light weight, the application of high-strength steel plates to automobile bodies has developed rapidly. High-strength steel plates used in automobile bodies can increase energy absorption during collisions and increase buckling strength without increasing plate thickness. However, since the ductility and bendability of the steel sheet decrease with the increase in strength of the steel sheet, the steel sheet may break during press forming or col...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01N3/20
CPCG01N2203/0212G01N2203/0214G01N3/20G06F2113/24G06F2111/10G06F30/23G06F30/20G06F2119/14
Inventor 米村繁桑山卓也上西朗弘丹羽俊之
Owner NIPPON STEEL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap