Ductility and Brittleness
nDuctility is measured in % Elongation of test material
n%El =100* (lf –
lo)/lo
nlf = length of test specimen at
fracture
nlo = original length of test
specimen
nIf %El >=5%,
material is ductile
nBrittle describes
the material if %El < 5%
nBrittle materials will usually exhibit different strengths in tension and compression
nSuc – ultimate
compressive strength
nIf Suc and Sut are not close in
value the material is called
nSuc is typically
>> Sut
nIf Suc and Sut are close in
value the material is called even