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Fracture Strain Value Exceeding 1 from a Tension Test

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struclearner

struclearner

Structural
May 8, 2010
122
When quoted Fracture Strain Ɛf value from a Tension Test is greater than 1, it means the change in length is larger than original length of the test specimen.
Shigley’s Mechanical Engineering Design, Tenth Edition, book has following Fracture Strain Ɛf values listed in Table A-22 on page 1051,
Material Condition Fracture Strain Ɛf
1018 Steel Annealed 1.05
303 Stainless Steel Annealed 1.16
304 Stainless Steel Annealed 1.67

Is this possible for these materials test specimens to obtain these strain values or what will be the interpretation of the quoted strain values which exceeds 1.

Thanks for your input for understanding and educating.
Regards
 
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the SS result will be highly strain rate dependent.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
 
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My 3rd Ed of Shigley does not list fracture strain.

Strain above 1.0 is definitely possible, think of a rubber band.
 
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I wonder if those are in micro-strains ? A strain of 1 in steel is very "odd".

E steel is 30E6psi, yield stress is about 90ksi ... strain = 90/30000 = 0.003, failure strain may be 0.01.

Is it "true strain" vs "engineering strain" ??

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
 
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