Selection of the Mathematical Model on Ductile-brittle Transition Temperature Curve of Impact Test

WANG Feng; LIAN Xiao-jie

PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING > 2009 > 45(10): 617-620.

WANG Feng, LIAN Xiao-jie. Selection of the Mathematical Model on Ductile-brittle Transition Temperature Curve of Impact Test[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2009, 45(10): 617-620.

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Selection of the Mathematical Model on Ductile-brittle Transition Temperature Curve of Impact Test

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Received Date: March 27, 2009

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Serial impact test datas were fitted with Boltzmann function and hyperbolic tangent function mathematical model separately and the ductlle-brittle transition temperature curve were gained. Quality and applicability of these two models were compared and parameters selection of these two models were discussed. The results show that mathematical model of Boltzmann function and hyperbolic tangent function were two different expressions of the same function. They had equal effects on ductile-brittle transition curve fitting. When high level value and low level value were not obvious,it was the precondition of determining accurately ductile-brittle transition temperature to suppose logically high level value and low level value.
- impact test,
- ductile-brittle transition temperature curve,
- mathematical model,
- Boltzmann function,
- hyperbolic tangent function

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