Digital Repository, ICF12, Ottawa 2009

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The influence of ageing on fatigue and fracture-related material parameters for an aluminum cast alloy
A. Leitgeb, H.-P. Gänser, R. Ehart, J. Fröschl, W. Eichlseder

Last modified: 2013-05-06


To meet the requirements of modern lightweight design in automotive
engineering, a continuously increasing use of aluminum alloys is observed. If
precipitation-hardening aluminum alloys are to be used in internal combustion
engines, the accelerated ageing of the material due to the elevated temperatures of
locally up to 250 °C must be taken into account.
To describe the influence of temperature and ageing on the parameters of the
material’s stress-strain behavior, several models (such as the one by Shercliff &
Ashby [7, 8]) have been proposed. Similar ideas have been pursued for the
fracture mechanics parameters. The present contribution deals with possible
analogies as well as with some fundamental differences between these concepts
from damage and fracture mechanics.
Using results from tensile, fatigue and fatigue crack growth tests, some simple
engineering estimates are proposed for describing the influence of ageing on the
material parameters.

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