SEDL / STP / STP877-EB / STP32883S

An Automatic Fatigue Crack Monitoring System and Its Application to Corrosion Fatigue

Kondo, Y
Research engineer and manager, Material Strength Research Laboratory, Takasago Technical Institute, Mitsubishi Heavy Industries, Ltd., Takasago,

Endo, T
Research engineer and manager, Material Strength Research Laboratory, Takasago Technical Institute, Mitsubishi Heavy Industries, Ltd., Takasago,

Pages: 14    Published: Jan 1985

Download this paper for $25 PDF (304K)          View License Agreement
Abstract

A measuring system that automatically detects fatigue crack initiation and propagation behavior has been developed. This system is based on calculating and recording automatically the change of compliance due to fatigue crack growth using an analog circuit.

The authors applied this system to fatigue testing in an aqueous environment and succeeded in detecting a part-through semi-elliptical crack as small as 0.2 mm deep initiating from the notch root.

Using this system, the crack initiation and following propagation behavior in the vicinity of a notch root in 3.5Ni-Cr-Mo-V steel in an aqueous environment were investigated.