日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 82, No. 04 (2018),
pp. 102-107

Probabilistic Model for Brittle Fracture and Statistical Characteristic of Absorbed Energy in Charpy Impact Test

Shinya Matsuda 1 and Manabu Takahashi 2

1 Department of Advanced Materials Science, Faculty of Engineering, Kagawa University
2 Department of Industrial Innovation, Faculty of Collaborative Regional Innovation, Ehime University

Abstract:

This paper discusses a theoretical approach to evaluating the statistical characteristics of Charpy absorbed energy to brittle fracture at low temperature. First, the probability distribution of fracture toughness for V-notch specimen was derived by combining a local fracture criterion and Weibull distribution. Second, a probabilistic model for the Charpy absorbed energy was derived by relating the fracture toughness and the Charpy absorbed energy based on the concept of Griffith-Orowan-Irwin. The Charpy absorbed energy was related to the material strength and the material constant, obeying the two-parameter Weibull distribution with a shape parameter of 2. Third, the Weibull analysis of the Charpy absorbed energy for V-notch specimen of high strength steel at lower temperature than Ductile-Brittle Transition Temperature (DBTT) and the statistical characteristics obtained from the model were compared. As a result, the proposed model was supported the statistical characteristics of the Charpy absorbed energy at a temperature sufficiently lower than DBTT.

[doi:10.2320/jinstmet.J2017049]


(Received 2017/10/20)

Keywords:

Charpy absorbed energy, brittle fracture, Weibull distribution, local fracture criterion


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.