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HELP on desiging a fixture for cutting small tension test couponsHelpful Member! 

avi1017 (Industrial) (OP)
22 Jan 12 18:46
Hie...Can anyone suggest me a fixture which is to be used to cut really small tension test coupons out of Al7075-T6.i need these for finding micro-scale strain inhomogenity. I'm planning to use  an NC milling machine
Helpful Member!  MikeHalloran (Mechanical)
22 Jan 12 20:04
Make 'em like the big ones, only smaller.

In order to keep the milling cutter from bending the necked area, I'd laminate the rough blanks between two sheets of aluminum with hot-melt glue or Gorilla Glue, and boil them apart after machining.

Since you're using CNC, you might consider milling in sturdy bridges around the test section, that you can remove with diagonal cutters or something similar after clamping the specimens in the testing machine's jaws.

I.e., something like this:

+------------------------------+
|   +---------------------+    |  (bridge)
|   |                     |    |
|   =======================    |   (test section)
|   |                     |    |
|   +---------------------+    |
+------------------------------+  (bridge)

 

 

Mike Halloran
Pembroke Pines, FL, USA

avi1017 (Industrial) (OP)
23 Jan 12 2:14
Hi Mike,

Thanks for your valuable idea.I would try that in my lab and let you know if I could make out one...


Regards,
Avinash Pulapaka
Compositepro (Chemical)
23 Jan 12 3:12
How small is small? A productive method for making many specimens is to use a router and template.

http://tensilkutengineering.com/sitemap.aspx

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