Measuring the damage factor of materials with the thin-walled cylinder torsion test and the low-cycle fatigue test
✍ Scribed by Shi Mingzhe
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 458 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Ahstraet-We have derived the expression of the damage factor, D = 1 -(G/G), by applying Lemaitre's strain equivalent hypothesis to the pure shear case, and used it as the theoretical basis for measuring D with the thin-walled cylinder torsion test. According to the damage strain energy release rate Y and the Mises criterion, we have obtained the relation between D,, and D,, 1 -D,,/l -D, = J[3/2(1+ v)]. Here, we have performed the torsion test on steel No. 35 and steel No. 45, and measured the value of D,; D, is then converted into D,,. We also have measured D, of steel No. 45 in the low-cycle fatigue test with controlled strain amplitude, and compared the test result of steel No. 45.