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Glossary
LASE.
Load At Specified Elongation.
Load-Deflection Diagram.
Plot of load vs corresponding deflection.
Maximum Fiber Stress.
Maximum tensile or compressive stress in a homogene-
ous flexure or torsion test specimen. For a specimen
loaded as a simple beam at its midpoint, maximum fiber
stress occurs at mid-span and may be calculated by the
formula (for rectangular specimens):
where S is maximum fiber stress; P, load; L, span; b,
width of the beam; and d, depth of the beam. For a circu-
lar cross section member loaded in torsion, maximum fi-
ber stress may be calculated by the following formula:
where T is twisting moment; r, original outer radius and
J, polar moment of inertia of original cross section.
Mean Stress.
Algebraic difference between maximum and minimum
stress in one cycle of fluctuating loading, as in a fatigue
test. Tensile stress is considered positive and compres-
sive stress negative.
B-18
3PL
S =
2
2bd
Tr
S =
J
M10-94400-1
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