ISSN:
1573-9325
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. The results of our investigation confirm the functionality of the equipment developed and the correctness of the methods used for testing of compact and double-cantilever specimens. 2. A change in specimen flexibility with constant fracture-section dimensions can materially affect the fracture-strrength values obtained. 3. The requirements imposed by the standard method for testing compact specimens [3] on the location of the site at which the displacement is measured can be relaxed. 4. Use of Eqs. (5) and (7) introduces a significant error in determination of the displacement at the loading line, the critical divergence angle at the crack apex, and the cirtical stress factor from the result of measurements made during tests on DCB specimens. 5. The horizontal scaling that develops with increasing specimen size makes it impossible to use the usual criteria for determining the reliability of the values obtained for KIc [3] and there is apparently a fundamental physical restriction on the extension of the methods of linear — elastic fracture mechanics to certain plastic and viscous materials. 6. Possible causes of the influence of crack length in CT specimens on the value of KQ include friction at the loading pins and horizontal scaling. 7. We have confirmed that it is feasible and expedient to develop a method for determination of fracture strength that will permit parallel use of approaches based on elasticity and plasticity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01129399
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