Scanning electron microscopy observations of fatigue crack growth retardation due to block overloads

Turan D., Turan S., Ay N.

ELECTRON MICROSCOPY AND ANALYSIS 2001, no.168, pp.223-226, 2001 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2001
  • Journal Name: ELECTRON MICROSCOPY AND ANALYSIS 2001
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Page Numbers: pp.223-226
  • Anadolu University Affiliated: No

Abstract

Fatigue crack propagation behaviour of 2024-T3 aluminium (Al) alloy under periodic overloads superimposed on constant amplitude loadings with R=0.5 and f=10 Hz was investigated by scanning electron microscopy (SEM). During the variable amplitude loading tests for every 1200, 2500 and 5000 cycles, a block of 100 cycles overload was applied. For variable amplitude loading tests, crack propagation rates were lower than in constant amplitude loading tests. Applied periodic overloads have a retardation effect on crack propagation and this effect was greater for 2500 cycles than 1200 and 5000 cycles. In the SEM, the retardation effect of block overloading was clearly observed.