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Tensile test coupon die
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Posted by: randykimball
Barney
09/08/2006, 22:34:07

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OK, who knows of an "off the shelf" stamping die for punching out the standard tensile test coupon from a sheet metal sample?
They MUST be out there, many labs, universities, shops, heat treat companies and such must make and test these coupons daily.




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Re: Tensile test coupon die
Re: Tensile test coupon die -- randykimball Post Reply Top of thread Forum
Posted by: Kelly Bramble

09/09/2006, 08:25:04

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Search google for "tensile coupon cutter", without the quotes. You might also try "Fatigue Coupon Cutter", or "Material Testing Coupon Cutter" How many coupon tests are you likely to do?

I would bet you would have some fun designing and building your own... They don't look that complicated, how thick is your stock?

One challenge I see with stamping out tensile test coupons, is the finished radii and edges. The finished radii is of major importance during any type of material testing. The test piece should be well finished, the surface within the gauge length should be very smooth. This is often done with a grade 00 emery or smooth abrasive wheel. So, your stamped part would need extra material so you can clean up the formed edges and eliminate any stress concentration geometry. I don't know if coupon cutters allow for extra material or not.







Modified by Administrator at Sat, Sep 09, 2006, 08:28:58


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Re: Re: Tensile test coupon die
Re: Re: Tensile test coupon die -- Kelly Bramble Post Reply Top of thread Forum
Posted by: randykimball
Barney
09/09/2006, 09:32:14

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Hi Kelly,
We get our testing done at the University of North Texas where we have a grant partnership. They currently shear off the material with a shear to .5" wide. The computor on the universal machine allows for width and thickness readings to calculate the cross section. When it comes down to it, as long as the test coupon has larger cross sections at the extremes to cause the weak link to be in the central area of the coupon all the other mass has very little effect on the results. Then as you have stated it is wise to avoid any flaws in the finish of the testing area in the center. I haven't searched under fatigue coupon nor material testing coupon yet, but tensile coupon in several variations got amazingly little results of use. As part of the partnership I have indicated that I would furnish a die.




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