![]() The average stress based on original area likewise decreases, and this produces the fall-off in the stress-strain curve beyond the point of ![]() Tension becomes unstable and necks down during the course of the test.īecause the cross-sectional area of the specimen is decreasing rapidly at this stage in the test, the load required continuing deformation falls off. ![]() The engineering stress-strain curve does not give a true indication of the deformation characteristics of a metal because it is based entirely on the original dimensions of the specimen, and these dimensions change continuously during the test. ![]()
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