ASTM D6395-2010
测定硬质塑料的平面挠性冲击耐受性能的标准试验方法

Standard Test Method for Flatwise Flexural Impact Resistance of Rigid Plastics

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标准号

ASTM D6395-2010

发布日期

2010年

实施日期

废止日期

无

中国标准分类号

G31

国际标准分类号

83.080.01

发布单位

US-ASTM

适用范围

The flatwise flexural impact test is a test in which the kinetic energy lost by a moving pendulum during impact is used to determine the energy to break or deform a test specimen.

The standard Izod test apparatus as described in Test Method D256 is retrofitted with clamping jaws, which hold the test specimen such that the flat face of the specimen is struck by the pendulum during a test.

The pendulum shall be a standard Izod pendulum as described in Test Method D256. It shall be capable of delivering an energy of 2.71 x00B1; 0.14 J (2.00 x00B1; 0.10 ft.-lbf). Except as detailed in 10.5, this basic pendulum shall be used with all specimens that extract less than 85 % of the available energy. Higher energy pendulums or a basic pendulum to which weights are added to increase its available energy shall be used with specimens that require more energy to break. A series of energy levels such that each has twice the energy of the next lighter one will be found convenient. The striking nose of the pendulum shall contact one of the flat faces of the specimen at a specified distance above the clamp edge. The ratio of the distance between the top of the clamp and the centerline of the rounded striking edge to the specimen thickness shall be 2.5 x00B1; 0.1.

The type of failure of each specimen tested shall be assigned one of the following categories:

Complete Break (C) A break in which the specimen is separated into two or more pieces.

Hinge Break (H)A nearly complete break in which there is little or no spring back when the free end is bent or displaced.

Partial Break (P)An incomplete break in which fracture extends through at least 50 % of the specimen thickness, and such that the free end can be bent with relatively little effort yet has considerable spring back.

Nonbreak (N)A result where there is no fracture or the fracture extends less than 50 % of the specimen thickness.

The value of this impact test is to determine the change in impact properties that may result from a material having been exposed to one or a series of environments, such as weathering at different intervals or different intensities when these data are compared to a file sample exposed only to the standard laboratory environment or other agreed upon conditions.

The flatwise impact resistance is calculated as energy absorbed per unit of cross-sectional area.

Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, and/or testing parameters covered in the material specification shall take precedence over those mentioned in this test method except in cases where to do so would conflict with the purpose for conducting testing. If there are no material specifications, then the default conditions apply.

1.1 The resistance of plastics to breakage by flexural shock may be determined by test methods such as those contained in Test Method D256. Specimens used in those test methods feature a milled notch to promote brittle fracture. The test specimens are struck by a pendulum with the depth dimension parallel to the direction of pendulum swing. This test method is differentiated from the others by its application to the assessment of the affect on impact resistance of changes in the surface of specimens resulting from weathering or other e......