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About the Fatigue strength definition for some specific metal-product

Submitted by Zhang Yanzhuo on

Is there anyone familiar with the S-N curve when dealing with Fatigue test?

S is the stress,σ? For a specific load, isn't it some stress distribution in the test coupon? How do somes testbooks or some industrial standards use only one stress as an element to describe the material or some metal products' fatigue strength? I executed the fatigue test for some metal-products by the load-controlled servo-hydraulic tig. I have some (load,life)points on the S-N coordination,e.g.(7.2KN,258910cycles),(6.0KN,10000000cycles) .

The comparison between practical measurement and simulation model results

Submitted by Zhang Yanzhuo on
research
practical measurement
simulation model

Under the practical manufacturing process, metal parts will deform according the loads exerted on them. I did some practical measurement on the mentioned metal parts before and after the deformation.e.g.Heat treatment, the metal parts could be expanded or screwed.The postions I used to measure the dimension of the metal part could not be traced.Simply to use the difference of the widths at some specific positions, for example, has non-sense to indicate the deformation of the metal parts.On the other hand, I could use Catia to simulate some deformations of the metal parts.

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