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Experimental Mechanics

, Volume 29, Issue 2, pp 188–194 | Cite as

A novel impact three-point bend test method for determining dynamic fracture-initiation toughness

  • T. Yokoyama
  • K. Kishida
Article

Abstract

A novel impact three-point bend test method has been developed for determining the dynamic fracture-initiation toughness,KId, over the range of loading rates\(10^5 MPa\sqrt m /s \leqslant K_I \leqslant 10^5 MPa\sqrt m /s\). 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 reliableKId 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 parameterKId.

Keywords

Fatigue Aluminum Alloy Crack Initiation Dynamic Load Bend Specimen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Society for Experimental Mechanics, Inc. 1989

Authors and Affiliations

  • T. Yokoyama
    • 1
  • K. Kishida
    • 1
  1. 1.Department of Precision Engineering, Faculty of EngineeringOsaka UniversityOsakaJapan

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