A novel impact three-point bend test method for determining dynamic fracture-initiation toughness |
| |
Authors: | T Yokoyama K Kishida |
| |
Institution: | (1) Department of Precision Engineering, Faculty of Engineering, Osaka University, Suita, 565 Osaka, Japan |
| |
Abstract: | A novel impact three-point bend test method has been developed for determining the dynamic fracture-initiation toughness,K
Id, over the range of loading rates
. The split-Hopkinson pressure-bar technique is used to measure dynamic loads applied to a bend specimen with a fatigue precrack.
The stress-intensity-factor histories for the bend specimen are evaluated by means of a dynamic finite-element technique and
the standard formula (ASTM E 399-83) based on the measured dynamic loads. The time of crack initiation is determined using
a strain gage mounted near a crack tip. The results for 7075-T6 aluminum alloy and Ti−6A1−2Sn−4Zr−6Mo alloy indicate that
the reliableK
Id data can only be obtained by evaluation procedures which take the inertial effects into account. It is shown that the novel
impact bend test method in conjunction with dynamic finite-element analysis provides an effective means of characterizing
the dynamic fracture-toughness parameterK
Id. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|