1.1 These test methods cover the determination of flexural
properties of unreinforced and reinforced plastics, including
high-modulus composites and electrical insulating materials in
the form of rectangular bars molded directly or cut from sheets,
plates, or molded shapes. These test methods are generally
applicable to both rigid and semirigid materials. However,
flexural strength cannot be determined for those materials that
do not break or that do not fail in the outer surface of the test
specimen within the 5.0 % strain limit of these test methods.
These test methods utilize a three-point loading system applied
to a simply supported beam. A four-point loading system
method can be found in Test Method D6272.
1.1.1 Procedure A, designed principally for materials that
break at comparatively small deflections.
1.1.2 Procedure B, designed particularly for those materials
that undergo large deflections during testing.
1.1.3 Procedure A shall be used for measurement of flexural
properties, particularly flexural modulus, unless the material
specification states otherwise. Procedure B may be used for
measurement of flexural strength only. Tangent modulus data
obtained by Procedure A tends to exhibit lower standard
deviations than comparable data obtained by means of Procedure
B.
1.1 These test methods cover the determination of flexuralproperties of unreinforced and reinforced plastics, includinghigh-modulus composites and electrical insulating materials inthe form of rectangular bars molded directly or cut from sheets,plates, or molded shapes. These test methods are generallyapplicable to both rigid and semirigid materials. However,flexural strength cannot be determined for those materials thatdo not break or that do not fail in the outer surface of the testspecimen within the 5.0 % strain limit of these test methods.These test methods utilize a three-point loading system appliedto a simply supported beam. A four-point loading systemmethod can be found in Test Method D6272.1.1.1 Procedure A, designed principally for materials thatbreak at comparatively small deflections.1.1.2 Procedure B, designed particularly for those materialsthat undergo large deflections during testing.1.1.3 Procedure A shall be used for measurement of flexuralproperties, particularly flexural modulus, unless the materialspecification states otherwise. Procedure B may be used formeasurement of flexural strength only. Tangent modulus dataobtained by Procedure A tends to exhibit lower standarddeviations than comparable data obtained by means of ProcedureB.
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