ISSN: 0090-3973
Page Count: 6

Fatigue Testing of Microspecimens from a Weldment

Yuan, B
The Johns Hopkins Hopkins University,MD,

Sharpe, WN
The Johns Hopkins Hopkins University,MD,

(Received 6 August 1996; accepted 24 January 1997)

Abstract

This paper describes a technique for measuring the strain-controlled cyclic stress-strain behavior of microspecimens taken from a steel weldment. The specimens have a cross-section 0.3 by 0.3 mm with a gage section approximately 1.4-mm long and are believed to be the smallest specimens that have ever been tested in fully-reversed axially-loaded fatigue tests. The microsample fatigue test system developed allows both strain and stress control. The key feature is the ability to measure strain directly using a laser-based strain gage that measures the relative displacement between two tiny reflective indentations in the specimen surface.

Keywords:
fatigue, microspecimens, weldments, interferometry, steel, strain gage

Paper ID: JTE11358J
DOI: 10.1520/JTE11358J
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