Paper Title:
Computation of Effective Fatigue Thresholds Based on a New Concept of Crack Closure
  Abstract

A new theoretical concept of crack closure under plain strain was applied to assess the effective fatigue threshold under various loading condition for selected aluminium and titanium alloys of different microstructures. The concept is based on the long-range effect of geometrically necessary dislocations remaining in the wake of propagating fatigue cracks. Calculated threshold values FKeff,th for 7475 aluminium alloy are about 1.9 MPa.m1/2 (in vacuum) and 1 MPa.m1/2 (in air), and about 2.5 MPa.m1/2 and 3.3 MPa.m1/2 for c-titanium and Ti-2.5%Cu, respectively. All calculated values are nearly independent on both the microstructure and the applied stress ratio and they are in a good agreement with experimental data.

  Info
Periodical
Key Engineering Materials (Volumes 324-325)
Edited by
M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz
Pages
803-806
DOI
10.4028/www.scientific.net/KEM.324-325.803
Citation
J. Horníková, P. Šandera, J. Pokluda, "Computation of Effective Fatigue Thresholds Based on a New Concept of Crack Closure", Key Engineering Materials, Vols. 324-325, pp. 803-806, 2006
Online since
November 2006
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Price
$32.00
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