The relationship between fracture toughness, stretched zone width and mechanical properties in tensile test
✍ Scribed by A.A. Baron
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 439 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Ah&act-The subject considered is the theoretical relationship between fracture toughness and stretched zone width ahead of a crack in an elastic-plastic material under plane-strain loading (mode 1). Distribution of the elastic-plastic equivalent strain ahead of a crack tip through the small-scale yielding region is presented as an exponential function of the distance from the crack tip and material properties. A model is proposed and discussed, which relates the fracture toughness, K,,, to the reduction of area in a tensile test, $, yield strength, a,, , and stretched zone length, W. The W values, calculated by means of this model, are consistent with experimental ones over the temperature range 77-223 K. It demonstrates the possibility of direct K,, estimation through the stretched zone width.