Paper Title:
Ductile-Brittle Transition Behaviors with Two Striker Geometries in the Instrumented Charpy Impact Test
  Abstract

Instrumented Charpy impact test method is possible to obtain various dynamic fracture characteristics from the load-deflection or load-time curve. Recently, instrumented Charpy impact test method is widely used for the evaluation of toughness of various specimens of different materials with different sizes. It is important to record an accurate impact load in order to improve the reliability of this test method. In some standards of instrumented Charpy impact test method such as ISO and ASTM, they haven.t clearly standardized striker geometry which seem to directly influence the obtained impact load. There are some differences between standards, although standard procedures are well defined. Therefore, instrumented Charpy impact test method has a problem that measurement value is different depending on each standard. In the present study, the effect of striking edge geometries, which are difference between ISO and ASTM, on load-deflection curve and absorbed energy were investigated. According to ISO and ASTM, two types of striker having different radius were machined. There was no difference between the two different striking edge geometries for values of absorbed energy per unit ligament area less than 0.75J/mm2. However, striking edge geometry according to ASTM is not propriety for Charpy impact test method because of four, instead of three, point bending on process of fracture at high level of absorbed energy. The effect of brinelling deformation, which was considered as an advantage of striking edge geometry according to ASTM, is very small on instrumented Charpy impact test. Consequently, there seem to be not an advantage of striking edge geometry according to ASTM. Therefore, standards should be unified in the striking edge geometry according to ISO.

  Info
Periodical
Materials Science Forum (Volumes 449-452)
Edited by
S.-G. Kang and T. Kobayashi
Pages
861-864
DOI
10.4028/www.scientific.net/MSF.449-452.861
Citation
S. Morita, T. Kobayashi, "Ductile-Brittle Transition Behaviors with Two Striker Geometries in the Instrumented Charpy Impact Test", Materials Science Forum, Vols. 449-452, pp. 861-864, 2004
Online since
March 2004
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Zhong Wei Li
Chapter 2: Applied Mechanics and Mechanical Engineering
Abstract:—Abstract: The use of high-strength rock bolt in the underground often occured brittle fracture in the threaded section, this is closely...
94
Authors: M.B. Ali, Kamarul Ariffin Zakaria, Shahrum Abdullah, M.R. Alkhari
Chapter 1: Advanced Materials and Characterizations
Abstract:This paper proposes the correlation of absorbed energy with calculated energy using the power spectrum density (PSD) method. The total...
221
Authors: Xin Luo
Chapter 1: Engineering Technologies in Designing of Machines and Equipments
Abstract:Charpy impact test is very sensitive to mechanical processing technologies and product defects. Charpy impact test can give quantitative test...
453