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How to calculate deformation strain in an ellipse?

How to calculate deformation strain in an ellipse?

How to calculate deformation strain in an ellipse?

(OP)
Hello all,

Can you show me a simple method to estimate the deformation strain in an ellipse? For example, I use a straight 0.5 mm wire, and formed it to an ellipse shape, with hemi-axis a=20mm and b=10 mm. What about the maximum deformation strain of the wire? Thanks a lot in advance.

RE: How to calculate deformation strain in an ellipse?

Strain ε can be calculated using wire thickness t and formed radius r:

ε = t/2r

For your example, the strain ε = 0.5/(2·5) = 0.05

RE: How to calculate deformation strain in an ellipse?

(OP)
Thanks a lot. Can you explain a little bit detail the procedure to get the radius?

RE: How to calculate deformation strain in an ellipse?

I estimated the small radius to be half the minor axis, and I assumed your b = 10 referred to the minor axis. Now that I look at your original post more closely, I suppose I should have used 10 instead of 5 since you used the word hemi-axis. In English, the term is semiminor axis.

RE: How to calculate deformation strain in an ellipse?

I think that a picture would gives us all a better idea of what exactly you are doing here. From your original post it is unclear what type of deformation the wire is actually undergoing.

Maui

www.EngineeringMetallurgy.com

RE: How to calculate deformation strain in an ellipse?

(OP)
Thanks. The picture should be the easiest way to get that.

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