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Testing of Fracture Resistance of Materials

Published online by Cambridge University Press:  26 February 2011

Beta Y. Ni ,
T. Y. Zhang  and
J. C. M. Li
Beta Y. Ni
Affiliation:
Materials Science Program, Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627.
T. Y. Zhang
Affiliation:
Materials Science Program, Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627.
J. C. M. Li
Affiliation:
Materials Science Program, Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627.
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Abstract

Both energy and load required to fracture the material are important quantities and they are not necessarily related to each other as suggested by the fracture mechanics of brittle materials. For example, the difference of the failure behavior between the semi-brittle ABS polymer and the ductile Al 6061-TO can be well characterized by a pre-fracture energy E0 (Joule/m) and a fracture energy Ef (Joule/m2 ). Al 6061-TO has much higher values of E0 and EF than the ABS polymer. This accounts for the ductility of Al 6061-TO. However, the applied stress intensity factor KIapp for both materials are similar. The reason is that their plastic zones have similar shielding effects, even though Aluminum has dislocations and the ABS polymer has cavities and crazes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 226: Symposium H – Mechanical Behavior of Materials and Structures in Microelectronics , 1991 , 383
Copyright
Copyright © Materials Research Society 1991

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