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On the problem of interpreting flexure experiments on semi-brittle materials

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
211
Identifiers
DOI: 10.1016/0921-5093(95)10161-6
Keywords
  • Flexure Experiments
  • Semi-Brittle Materials
  • Deformation Behavior
Disciplines
  • Mathematics

Abstract

Abstract This investigation focuses on the relationship between the deformation behavior of semi-brittle materials tested in uniaxial and flexural geometries. It has been shown that flexural load-displacement data exhibit no detectable non-linearity until a significant volume of material has been plastically deformed near the region of maximum stress. Therefore, determination of yield stress from load-displacement data in bending and the assumption of an elastic stress distribution will give in general a 70% overestimation of the value measured uniaxially. By combining experimental and numerical analyses, a correction procedure has been developed for materials that display work hardening behavior which allows for the approximation of uniaxial yield stress from flexural load-displacement data. The cast irons tested here show that a tension-compression asymmetry can also be easily taken into account with this method.

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