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Evaluation of the Effect of Surface Roughness on Crack Initiation Life
Last modified: 2013-05-03
Abstract
The surface finish for machine elements is considered to be very important
process influencing the fatigue crack initiation life that predominantly determines
the total fatigue life. The surface roughness, the residual stress and the structure of
the surface lay are main characteristics depending on the surface finish process.
At present, the effects of these factors on the fatigue strength have not yet been
evaluated precisely; in strength design, engineers have to introduce the surfacefinish
factor or roughness factor to modify the fatigue limit in practical strength
design. However, this modification method is considered not so reasonable and
accurate for the evaluation of the effects of the surface conditions on the fatigue
strength [1].
process influencing the fatigue crack initiation life that predominantly determines
the total fatigue life. The surface roughness, the residual stress and the structure of
the surface lay are main characteristics depending on the surface finish process.
At present, the effects of these factors on the fatigue strength have not yet been
evaluated precisely; in strength design, engineers have to introduce the surfacefinish
factor or roughness factor to modify the fatigue limit in practical strength
design. However, this modification method is considered not so reasonable and
accurate for the evaluation of the effects of the surface conditions on the fatigue
strength [1].
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