University of Illinois Urbana-Champaign

Temperature characterization of below KISCC corrsion fatigue behavior of HY 130 steel

Ryder, J. T.; Gallagher, J. P.

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https://hdl.handle.net/2142/112082

Description

Title
Temperature characterization of below KISCC corrsion fatigue behavior of HY 130 steel
Author(s)
  • Ryder, J. T.
  • Gallagher, J. P.
Issue Date
1972
Keyword(s)
  • Temperature Characterization
  • Corrosion
  • Fatigue
  • Hy-130 Steel
Abstract
An investigation of the below KISCC corrosion fatigue crack propagation behavior of HY-130 steel in a 3½% NaCl environmental solution is conducted. The KISCC for this environmental-material system as determined from 7000 hr Bolt Loaded tests is approximately 115 ksi √in. The main variables of study are: temperature, frequency, and stress intensity range. The investigation and results are considered to be important for several reasons. First, the general nature of below KISCC crack propagation behavior and particularly the influence of temperature is more clearly understood. Second, small temperature changes, usually considered to be insignificant, are shown to greatly affect the lives of engineering structures. Third, temperature can be used to reduce the length of testing time necessary for determining the crack propagation behavior of a material in an aqueous environment. Reducing testing time by increasing temperature and frequency simultaneously retains the environmental effect as opposed to increasing frequency alone which can mask environmental effects. A generalized empirical equation for the corrosion fatigue crack propagation rate is developed as a function of temperature, frequency, and stress intensity range. This equation is based on an assumption that the corrosion fatigue crack growth rate was equal to the air fatigue rate times an environmental effect greater than or equal to one. The crack forking phenomenon, which limited the frequency and stress intensity range at which the below KISCC behavior of HY-130 steel could be investigated, is discussed. Macroscopic crack forking results in a reduced crack propagation rate in the present experimental conditions. To study the crack forking phenomenon further, scanning electron microscope fractographs of crack propagation surfaces developed in air, distilled water and NaCl environments are compared. In general, the main effect of increased severity of environment on microscopic features is extensive enhancement of features seen in dry air fatigue surfaces.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 355
  • 1972-6003
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112082
Sponsor(s)/Grant Number(s)
National Science Foundation Nd, Contract No. NSF GK 5584 ND
Copyright and License Information
Copyright Need Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.