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Compressive
Compressive properties
are obtained by mounting in a compression tool between testing
machine heads which exert constant rate of movement. Indicator
registers loading.
The compressive strength
of a material is calculated as the psi required to rupture
the specimen or deform the specimen a given percent age
of its height. It can be expressed as psi either at rupture
or at a given percentage of deformation.
The compressive strength
of plastics is of limited design value, since plastic products
(except foams) seldom fail from compressive loading alone.
The compressive strength figures, however, may be useful
in specifications for distinguishing between different grades
of a material, and also for assessing, along with other
property data, the over-all strength of different kinds
of materials. ASTM D-695.
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