When I did tensile tests on a ultrahigh strength steel dog-bone bar, it usually broke down before it got yield. How can I avoid this and get an entire tensile curve?
Dear Zhang,
You haven't mentioned the sresss and strain at failure and the failure location. Could you elaborate?
Dear Pramod,
At such high strength the plastic behavior tends to vanish .
Anyway I would try with much lower crosshead speed.
Lowering the strain rate should help. However, as pointed out earlier materials with such high strength become brittle. Most of the times this strength is achieved by using different techniques such as precipitation hardening, solid solution strengthening, controlling grain size by heat treatment etc.These mechanisms do not allow dislocations to move which restricts plastic deformation. It increases the yield strength, but also decreases the plastic zone making material more brittle.
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