elongation results in ASTM E8 samples are scalable?
elongation results in ASTM E8 samples are scalable?
(OP)
Can someone confirm for me that since ASTM E8 holds constant the Length/Diameter of the tensile coupon that the elongation at 1" gage should be the same as 2" gage?





RE: elongation results in ASTM E8 samples are scalable?
However, little things like grain size and strain rate can have a large impact depending on the alloy and test method.
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Plymouth Tube
RE: elongation results in ASTM E8 samples are scalable?
Some testing specificaitons require testing of full section or strip samples, which specify a 2" gauge length (or, sometimes, an 8" gauge length). With these specimens, you will have to look in the product specification as to how to deal with the elongation requriement when testing alternate specimens.
rp
RE: elongation results in ASTM E8 samples are scalable?
RE: elongation results in ASTM E8 samples are scalable?
In annealed 304L stainless you will get >50% elongation, and it is spread out over a lot of the sample length, so measuring over l/d=8 will only give a value slightly lower than using l/d=4.
We also do some high strength SS (cold worked to 150ksi UTS) that for l/d=4 we get 30% but l/d=8 the value is 20%.
In high strength materials the deformation will tend to be concentrated near the fracture so the longer the gage length the lower the apparent elongation.
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Plymouth Tube