Digitale Medien
Oxford, UK
:
Blackwell Science Ltd
Fatigue & fracture of engineering materials & structures
25 (2002), S. 0
ISSN:
1460-2695
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Maschinenbau
Notizen:
There is a commercial interest to extend the use of die-cast magnesium from low stress applications, such as interior components of motor vehicles, to components carrying significant loads. In high stress applications it is the strength and fatigue properties of die-cast magnesium alloys that limit their use. Manufacturing defects, such as microscopic shrink holes, pores and oxide inclusions, impair the strength of components under fatigue loads, but are unavoidable with present-day magnesium casting technology. In the present study, the effects of different rib thicknesses and notch radii on the fatigue strength were investigated on realistic cast specimens with unmachined surfaces. The tests were performed on ribbed specimens of magnesium alloys AZ91 and AM60 under pulsating bending stress with a constant amplitude at a stress ratio R = 0. As indicated by the results of the investigation, the real material must be considered together with its defects in designing die-cast magnesium components. For this purpose, the influence of defects must therefore be given a higher priority than the local stresses at the surface.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1046/j.1460-2695.2002.00607.x
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