Impact loads and strain rate dependent yield stress
Impact loads and strain rate dependent yield stress
(OP)
I've seen references to yield stress that is dependent upon the strain rate that the load is applied, ie. that the apparent yield stress increases with the rate at which the load is applied, as under impact.
Should the allowable stress for impact loads be increased as compared to an equivalent static load given this change of yield stress, and by what factor for plain carbon steel for example. Are there any reference in design standards for this effect on yield stress?
Should the allowable stress for impact loads be increased as compared to an equivalent static load given this change of yield stress, and by what factor for plain carbon steel for example. Are there any reference in design standards for this effect on yield stress?
corus






RE: Impact loads and strain rate dependent yield stress
I think you are referring to increase in yield stress depending on how fast the load is applied during a tension test. This is not comparable with impact load.
Usally, the impact is account for by increasing the static load with a factor. For bridge design, this is usally 1.33.
Hope this helps.
RE: Impact loads and strain rate dependent yield stress
As you say, I am referring to an increase in yield stress depending on how fast the load is applied during a tension test. If the load is applied quickly then how is this different from an impact which is also a fast application of load?
corus
RE: Impact loads and strain rate dependent yield stress
RE: Impact loads and strain rate dependent yield stress
RE: Impact loads and strain rate dependent yield stress
corus
RE: Impact loads and strain rate dependent yield stress
corus
RE: Impact loads and strain rate dependent yield stress
The topic that you are inquiring about seems rather interesting. I found the following link while doing a Google search:
http://links.jstor.org/sici?sici=0080-4630(19480902)194%3A1038%3C300%3ATUOFPF%3E2.0.CO%3B2-5
I wonder how much the effects are when applied to machinery? If you find out anything more, please let us know, as its an interesting topic.
RE: Impact loads and strain rate dependent yield stress
Here's another link on this topic:
http://www.springerlink.com/content/q22841102025q73x/
RE: Impact loads and strain rate dependent yield stress