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Unformatted text preview: decrease in cross
Engineering stress decreases with
further strain until fracture occurs.
Engineering stress uses original area. PERCENT ELONGATION
measure of the
Reported for a
length % elongation = l f − lo
lf is the final gage length
lo is the original gage length PERCENT REDUCTION IN AREA
Provides a measure of the ductility % reduction in area = Ao − A f
Ao × 100 where:
Ao is the original cross-sectional area
Af is the final cross-sectional area Hardness Testing
A measure of
of a metal to
surface. COMMON HARDNESS TESTS
Hardness is related to strength Engineering Stress-strain versus True Stress-strain Plastic Deformation
Consider the permanent deformation of a single
crystal stressing beyond its elastic limit.
Slip Planes: Slip or shear deformation of metal
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This document was uploaded on 02/27/2014 for the course NANO 108 at UCSD.
- Fall '13