| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring method in which Young's modulus at the high temperature of an aluminum material is measured with high reliability. SOLUTION: A tensile load which generates a stress at a yield strength of 0.2% or higher and at a tensile strength of 0.2% or lower is set at an aluminum-material test piece which is heated at a temperature in a temperature region of 150 to 350 deg.C. while the extension of the aluminum-materials test piece is increased sequentially by every 0.1 to 0.2%, the tensile load is applied repeatedly. A straight-line part in a place in which a load-extension curve rises in a load-extension diagram is made long. The inclination of the long straight- line part is measured. Between respective processes in which the tensile load is applied repeatedly, it is preferable that the load which is applied to the aluminum-materiel test piece is not removed completely so as to be shifted to the next application of the tensile load. As a result, since the inclination is found on the basis of the long straight-line part, an irregularity which is derived from a measuring operator, a measuring condition or the like is reduced.
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