METHOD FOR EVALUATING IMPACT BENDING/SHEARING RESISTANCE CHARACTERISTICS OF MATERIAL

PROBLEM TO BE SOLVED: To provide a method for performing material selection without testing each material using an actual machine in order to select a material.SOLUTION: A method for evaluating impact bending/shearing resistance characteristics of materials includes: a first step of determining one kind as a reference material 3 among candidate materials 1 and executing a test thereof using an actual machine; a second step of determining an energy required for producing the same level of stress thereas in an impact bending/shearing specimen; a third step of applying a test under the energy to candidate materials 2 and measuring relational data between stress and toughness; a fourth step of executing variation analysis in a case where a comparison is made between results of the test of the reference material 3 using the actual machine and results of the test of the impact bending/shearing and any difference occurs in the relational data between the produced stress and toughness, and then estimating the relational data between the produced stress and toughness for other materials corresponding to the actual machine; and a fifth step of executing lifetime prediction calculation for each of the materials in consideration of fundamental test data besides the relational data between the produced stress and toughness corresponding to the actual machine, and relatively evaluating a lifetime under repeated impact load. 【課題】材料の選定をするために、実機での試験を各々行なうのではなく材料選定をする方法を提供する。【解決手段】候補材料１の中から1種を基準材料３に決め、実機試験を実施する第１工程と、同レベルの応力を、衝撃曲げ・せん断の試験片に発生させるために必要なエネルギーを求める第２工程と、このエネルギーでの試験を候補材料２について実施し、応力と靱性の関係データを計測する第３工程と、基準材料３の実機と衝撃曲げ・せん断試験結果を比較し発生応力と靱性の関係データに差異が生じた場合は差異分析を行い、他材料の実機相当の発生応力と靱性の関係データを推定する第４工程と、前述の実機相当の発生応力と靱性の関係データの他に基礎試験データも考慮して、各材料の寿命予測計算を実施し、繰返し衝撃荷重に対する寿命の相対評価を行う第５工程と、よりなる方法である。【選択図】図２