How to Perform ASTM D2412 Plastic Pipe Deflection Testing

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Summary of Test

ASTM D2412 is a testing standard used to determine the stiffness and load deflection of plastic pipe. This summary is intended to help you understand the basic procedure and equipment required to complete this test with accuracy. Prior to conducting ASTM D2412, it is important to read the entire specification in the relevant ASTM publication.

A universal testing machine (tensile / compression machine) and load cell with a maximum force range and available testing area to satisfy your pipe strength and size are required. Normal dual-column systems have 16″ – 22″ between the columns. Wide versions of all of these machines are available to accommodate large pipe diameters.

A testing controller capable of servo control and moving the cross head at the specified rate is also needed. ADMET testing controllers satisfy this requirement and can automatically record load and deflection. MTESTQuattro®, our most advanced testing controller, is a PC-based unit that offers a wide range of flexibility in control, data acquisition, analysis, and reporting. ASTM D2412 test method and calculations are built into the MTESTQuattro testing software. The eP2 Digital Controller, a standalone touch panel unit, offers a balance between performance and simplicity.

eXpert 2600 Universal Testing System

ADMET can provide pair of smooth compression platens capable of applying the required load without bending. The length of the plate should equal or exceed that of the specimen. Plate width should equal or exceed the pipe’s contact area at maximum deflection plus 6 in.

ASTM D2412 Compression Platens

Testing Procedure

Depending on the type of plastic pipe being tested, cut the specimen to the lengths specified. Be sure to cut the pipe cleanly. Condition the specimens to the temperature detailed in the specification. Prepare and test at least three specimens for each pipe.
Measure the length, average diameter, and average wall thickness of the specimen as specified in the standard.
Load the specimen by centering it on the bottom plate and apply just enough force to keep the sample in place with the upper platen.
Begin compressing the specimen at the specified rate.
Be aware of line cracking, wall cracking, wall delamination, and break. Record the load and deflection when these events are observed.
Stop the test when the specimen reaches the required maximum deflection, at break, or when the load no longer increases with deflection.

Calculations: