ASTM D732 test fixtureASTM D732 is a test used to measure the shear strength of a plastic to determine if it will withstand the necessary stress without distortion or cracking.

If you plan on conducting ASTM D732 we recommend acquiring the test standard from ASTM. There are many important details regarding this test method that are provided which are key to achieving successful results. Every standard provides important environmental conditions, test sample preparation and conditioning requirements, sample dimensions and test reporting expectations. It’s critical that you fully understand the standard so that you can set up the test, run the procedure, and report the results requirements.

What Is ASTM D732?

ASTM D732 standardizes the shear punch test that is used to determine shear strength of sheet and molded disk plastic specimens ranging from 1.27 to 12.7 mm (0.050 to 0.500 in) thick.

Why Perform Shear Tests on Plastic?

The test helps compare shear performance between materials and also to obtain engineering design data.

Important Considerations When Testing to ASTM D732

For end-use applications there may be many factors not taken into account in this simple test method, such as stress-concentrating geometries and rates of shear, which can affect shear strength. Also, shear strength is calculated by dividing the load by the area of the sheared edge (circumference X thickness) and should not be interpreted as indicating that the shear strength value so obtained is solely a material property, independent of thickness.

ASTM D732 Test Specimens

The specimen consists of a 50 mm (2 in) square or a 50 mm (2 in) diameter disk cut from sheet material or molded into the form. The thickness of the specimen may be from 1.27 to 12.7 mm (0.050 to 0.500 in). The upper and lower surfaces are parallel to each other and reasonably flat. A hole approximately 11 mm (7⁄16 in) in diameter is drilled through the specimen at its center.

Test Machines for Plastics

Our universal test machines serve multiple plastic testing applications and are capable of performing all quasi static tension/compression tests, such as tensile, peel, adhesion, and flexural testing. The machine force capacity should be chosen by taking into account the highest force needed over the lifetime of the equipment. Our machines feature a uniform constant rate of extension (CRE), or constant velocity control mode, with a speed range between 1 and 500 mm per minute (0.04 to 20 in/min). Force measurement complies with ASTM E4 (ISO 7500-1).

The majority of rigid plastics tests can be performed at loads under 25 kN (5500 lbf).

ASTM D732 Test Systems

What Shear Tool is Recommended for ASTM D732?

Our model GD732-712 is an application specific test fixture designed exclusively for ASTM D732. The specimen is rigidly clamped both to the stationary block and movable block so that it cannot be deflected during the test.

What Other Accessories Are Available?

A digital micrometer is used to measure and capture the thickness of the test specimen to an incremental discrimination better than 0.025 mm (0.001 in.).

Articles Related to ASTM D732

ASTM D732 Testers

100 Family Electromechanical Universal Test Machine

Most Economical

The 100 Family is the most economical solution but it offers less functionality and flexibility then other systems. The load frame is compact and lightweight which is great if lab table space is limited. Complete system includes controller software, load frame, actuator and grips specifically configured for your biomedical test. 

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240 Family Electromechanical Universal Test Machine

Best Performance

The 240 Family is the ideal solution for a wide range of tests and features higher travel and faster speeds compared to traditional universal test machines. The load frame is compact and lightweight which is great if space is limited. Complete system includes controller software, load frame and grips specifically configured for your test requirements.

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312 family Electromechanical Universal Test Machine

Most Versatile

The 312 family tabletop machines are configured to your exact needs including performance, flexibility, simplicity and affordability. This frame is best for smaller loads and a higher speed. Complete system includes controller software, load frame and grips specifically configured for your test requirements.

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ASTM D732 Shear Tool

ASTM D732 Software

ASTM D732 Test Machine Controller Software

ASTM D732 Test Machine Controller Software | ND732

Application specific module features preset settings, test calculations, and graphical test report contents.

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Note: This is not a complete summary of the standard. Anyone planning to conduct this test should read the full standard.