发明名称 |
Method and apparatus for determining elastic constants in tubes |
摘要 |
Method and apparatus for determining Young's Modulus of a specimen by measuring the speed at which stress waves, either P-waves or S-waves, propagate therein. An embodiment of the apparatus includes two fixtures which are removably affixed to opposite ends of the specimen. A hammer having an accelerometer affixed to its head is used to strike the first fixture to produce stress waves in the specimen. A timing means starts counting in response to an output generated by the accelerometer when the hammer strikes the first fixture. A second accelerometer affixed to the second fixture detects the stress waves and generates an output which causes the timing means to stop counting. Further circuitry extracts the measured time, calculates a dispersion time delay based on material and length, and subtracts the dispersion time delay and a predetermined constant, both dependent on the material in the specimen, from the measured time to form a corrected transit time. The circuitry uses the corrected transit time to determine the propagation speed of the stress waves and Young's Modulus therefrom.
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申请公布号 |
US4899588(A) |
申请公布日期 |
1990.02.13 |
申请号 |
US19890300331 |
申请日期 |
1989.01.23 |
申请人 |
MICRO MOTION INCORPORATED |
发明人 |
TITLOW, JOSEPH D.;BROST, WILMUT;HAHN, DAVID T. |
分类号 |
G01F1/84;G01F25/00;G01N29/04;G01N29/07 |
主分类号 |
G01F1/84 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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