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# 4130 Steel and Poisson's Ratio

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## 4130 Steel and Poisson's Ratio

(OP)
When I select 4130 steel as my material for COSMOS, there is no value for Poisson's ratio, and it is assumed to be zero.  When I change my material to 1020 steel, Poission's ratio is set to 0.29.  I am concerned with stiffness, not strength, so I do not mind analyzing 1020.  I do want some sort of sanity check.

Does no Poissoin's ratio for 4130 steel make sense?

JHG

Replies continue below

### RE: 4130 Steel and Poisson's Ratio

In SW2010 there are2 values for poisson's:
4130 annealed @ 865   => 0.285
4130 normalized @ 870 => 0.285
4130 annealed         => 0.285
4130 normalized       => 0.320
I have found that for many materials in Solidworks they are to some degree incomplete.

-Richard

### RE: 4130 Steel and Poisson's Ratio

(OP)
fairlane46,

Thanks.

I am on 2007 here, and it provides a value of zero. Maybe this is not a CAD question so much as a metallurgy and mechanics of materials question.

JHG

### RE: 4130 Steel and Poisson's Ratio

I don't know why they would put a value of 0 in but using 0.29 will give you good results.  For poissan's to equal 0 the material would shrink to nothing when stretched.

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