FRACTURE TOUGHNESS CHARACTERISTIC EVALUATING METHOD AND DEVICE FOR NON-HOMOGENEOUS MATERIAL CT TEST PIECE

摘要

PROBLEM TO BE SOLVED: To easily evaluate the fracture toughness characteristic of a CT test piece composed of a non-homogeneous material without performing FEM analysis. SOLUTION: This device comprises aζ0calculating part 3 for calculating a coefficientζ0on the basis of a crack length a and a ligament length b generated on a welding material 16, a variable calculating part 4 for calculating variablesα,βto minimize the ultimate load PL of the CT test piece 14 on the basis of the coefficientζ0, aη(i-1)calculating part 5 for calculating a coefficientη(i-1)on the basis of the variablesα,β, a width W of the CT test piece 14, the crack length a, the ligament length b, a load step i, and a welding half width h of the welding material 16, aγ(i-1)calculating part 6 for calculating a coefficientγ(i-1)as the coefficient on the basis of the ligament length b, the load step i and the width W, a toughness term calculating part 7 for calculating a toughness term of the fracture toughness characteristic, an elasticity term calculating part 8 for calculating the elasticity term, and a fracture toughness characteristic acquiring part 9 for acquiring the fracture toughness characteristic by adding the elasticity term and the toughness term. COPYRIGHT: (C)2003,JPO