| 摘要 |
PROBLEM TO BE SOLVED: To directly measure the Young's modulus of the constitutional material of a clad material from the clad material itself not only at the normal temp. but also at high or low temp. SOLUTION: A sample piece 1 having a rectangular cross section is prepared from a clad material wherein two layers (A), (B) composed of different material qualities are mutually bonded to be hung down in a freely vibratory manner within a chamber 2, a matter is allowed to collide with the test piece 1 to generate a crashing sound and the frequency of this crashing sound is analyzed to calculate the natural frequency of the test piece 1. The equivalent bending rigidities (Bx, By) of the test piece 1 are calculated from this natural frequency and the Young's moduli (E1 , E2 ) of two layers are calculated from the equivalent bending rigidities (Bx, By). The chamber can be heated or cooled and the temp. in the chamber is held to predetermined temp. and the generated crashing sound is detected from the exterior of the chamber through the detection port communicating with the chamber. |
