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  • Calculating CREEP of a material

    Discussion in 'Calculations' started by MechEngineer, Oct 26, 2009.

    1. MechEngineer

      MechEngineer Member

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      I have designed a sheet metal bracket from 4mm stainless steel 304. There is a load on one of the corners that causes a 0.4mm deflection.

      I think this is OK right now, but I am concerned about creep (material straining over time). Will that 0.4mm stretch to 2mm in 10 years time? :eek: :shock: Does anyone know a simple way of calculating creep of a material?

      By the way, the force applied to create the deflection is 200N, and the temperature range the part will see over its lifespan is between -40 to +80degrees Celcius (I know that this kind of info is important for creep issues)

      Any help would be welcomed as I'm really stuck on this.
       
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    3. maniacal_engineer

      maniacal_engineer Well-Known Member

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      the best online database for material properties that i have found is matweb.com.

      That said, 304 at 80c isn't going anywhwere. you listed a load, and a deflection, but not a stress level. However, assuming that you are at something sane like 80% of yield or less, 80C is not hot enought for you to have to worry about creep.
       
    4. mvalenti

      mvalenti Well-Known Member

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      I agree with the previous poster, at 80c I wouldnt worry about it.
       

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