ASTM D4475 Test Fixture

Description

ASTM D4475- Standard Test Method for Apparent Horizontal Shear Strength of Pultruded Reinforced Plastic Rods By the Short-Beam Method

 

ASTM D4475 covers the determination of the apparent horizontal shear strength of fiber reinforced plastic rods.

The specimen is a short beam in the form of lengths of pultruded rods.

This test method is applicable to all types of parallel-fiber-reinforced plastic rod samples.

This test method is primarily used for quality control and specification purposes

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ASTM D4475 / Significance and Use

Apparent shear strength determined by this test method is useful for quality control and specification purposes.

It is also applicable to research and development programs concerned with interlaminar-shear strength.

The apparent shear strength obtained by this test method cannot be used for design purposes, but can be utilized for comparative testing of composite materials,

if all failures are in horizontal shear.

It is recommended that control samples be fabricated with each research test series and that care be used to compare each set of controls with corresponding test

series run at different times.

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ASTM D4475 / Apparatus

Testing Machine—A properly calibrated testing machine that can be operated at a constant rate of crosshead motion, and in which the error in the load measuring

system measured.

The load-indicating mechanism shall be essentially free of inertia lag at the crosshead rate used.

Loading Nose and Supports— The loading nose shall be a suitable steel rod with a Groove in the diameter of the pultruded rod machined in its lower end.

The groove diameter shall always have a plus tolerance and zero negative tolerance.

The bottom support shall be adjustable to allow for testing at various span/diameter ratios.

The surface of the groove shall be free of indentation and burrs, with all sharp edges relieved.

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ASTM D4475 / Summary of Test Method

The horizontal-shear test specimen is center-loaded .

The ends of the specimens rest on two supports that allow the specimen to bend, the load being applied by means of a loading nose at midpoint along the support

span

The specimen is deflected until a shear failure occurs at the midplane of the horizontally supported rod.

*** Before conducting ASTM D4475 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.

 

***PARSROS  offers several types of grips and fixtures which will enable you to perform a variety of tests

  that are accurate and repeatable.