FRACTURE DETERMINATION METHOD, FRACTURE DETERMINATION APPARATUS, PROGRAM, AND COMPUTER READABLE RECORDING MEDIUM
First Claim
1. A fracture determination method for determining a fracture of a metal structure, the method comprising:
- a deformation analyzing step of performing deformation analysis from start of deformation to end of deformation of the metal structure; and
a fracture determination step of extracting a fracture determination target portion from a deformation state of the metal structure obtained in the deformation analyzing step, and when the extracted fracture determination target portion has returned from a plastic state to an elastic state,given that a stress when the portion returned to the elastic state is (x, y)=(σ
2, σ
1) (maximum principal stress;
σ
1, minimum principal stress;
σ
2) on a (x, y) coordinate plane,performing fracture determination of the fracture determination target portion using a re-yield stress determined by an intersection between a straight line satisfying a relation y=(σ
1/σ
2)x and an yield curve obtained from the plastic state of the fracture determination target portion.
3 Assignments
0 Petitions
Accused Products
Abstract
A fracture determination method for determining a fracture of a metal structure includes, when a fracture determination target portion has returned from a plastic state to an elastic state, given that a stress when the portion returned to the elastic state is (x, y)=(σ2, σ1) (maximum principal stress: σ1, minimum principal stress: σ2) on a (x, y) coordinate plane, performing fracture determination of the fracture determination target portion using a re-yield stress R determined by the intersection between a straight line satisfying a relation y=(σ1/σ2)x and an yield curve obtained from the plastic state of the fracture determination target portion. Fracture determination can be performed with high accuracy even when the fracture determination target portion has returned from a plastic state to an elastic state.
-
Citations
7 Claims
-
1. A fracture determination method for determining a fracture of a metal structure, the method comprising:
-
a deformation analyzing step of performing deformation analysis from start of deformation to end of deformation of the metal structure; and a fracture determination step of extracting a fracture determination target portion from a deformation state of the metal structure obtained in the deformation analyzing step, and when the extracted fracture determination target portion has returned from a plastic state to an elastic state, given that a stress when the portion returned to the elastic state is (x, y)=(σ
2, σ
1) (maximum principal stress;
σ
1, minimum principal stress;
σ
2) on a (x, y) coordinate plane,performing fracture determination of the fracture determination target portion using a re-yield stress determined by an intersection between a straight line satisfying a relation y=(σ
1/σ
2)x and an yield curve obtained from the plastic state of the fracture determination target portion. - View Dependent Claims (2, 3, 4)
-
-
5. A fracture determination apparatus determining a fracture of a metal structure, the apparatus comprising:
-
a deformation analyzing unit performing deformation analysis from start of deformation to end of deformation of the metal structure; and a fracture determination unit extracting a fracture determination target portion from a deformation state of the metal structure obtained in the deformation analyzing unit, and when the extracted fracture determination target portion has returned from a plastic state to an elastic state, given that a stress when the portion returned to the elastic state is (x, y)=(σ
2, σ
1) (maximum principal stress;
σ
1, minimum principal stress;
σ
2) on a (x, y) coordinate plane,performing fracture determination of the fracture determination target portion using a re-yield stress determined by an intersection between a straight line satisfying a relation y=(σ
1/σ
2)x and an yield curve obtained from the plastic state of the fracture determination target portion.
-
-
6. A program for determining a fracture of a metal structure, the program causing a computer to execute:
-
a deformation analyzing step of performing deformation analysis from start of deformation to end of deformation of the metal structure; and a fracture determination step of extracting a fracture determination target portion from a deformation state of the metal structure obtained in the deformation analyzing step, and when the extracted fracture determination target portion has returned from a plastic state to an elastic state, given that a stress when the portion returned to the elastic state is (x, y)=(σ
2, σ
1) (maximum principal stress;
σ
1, minimum principal stress;
σ
2) on a (x, y) coordinate plane,performing fracture determination of the fracture determination target portion using a re-yield stress determined by an intersection between a straight line satisfying a relation y=(σ
1/σ
2)x and an yield curve obtained from the plastic state of the fracture determination target portion.
-
-
7. A computer readable recording medium recording a program for determining a fracture of a metal structure, the program causing a computer to execute:
-
a deformation analyzing step of performing deformation analysis from start of deformation to end of deformation of the metal structure; and a fracture determination step of extracting a fracture determination target portion from a deformation state of the metal structure obtained in the deformation analyzing step, and when the extracted fracture determination target portion has returned from a plastic state to an elastic state, given that a stress when the portion returned to the elastic state is (x, y)=(σ
2, σ
1) (maximum principal stress;
σ
1, minimum principal stress;
σ
2) on a (x, y) coordinate plane,performing fracture determination of the fracture determination target portion using a re-yield stress determined by an intersection between a straight line satisfying a relation y=(σ
1/σ
2)x and an yield curve obtained from the plastic state of the fracture determination target portion.
-
Specification