ASTM D695-15 Compression Testing of Rigid Plastics
ASTM D695 is a test method to the determine compressive properties of un-reinforced and reinforced plastics. Usingcompression platens to apply a force, the properties obtained are compressive strength, compressive yield point, and modulus. The standard specimen for strength determination is a right cylinder or prism whose length is twice its principal width or diameter. If the specimen is too thin an anti-buckling support jig should be used to prevent the specimen from buckling.
The challenges of testing to this standard are:
- Compressive strain measurement
- Reporting calculations in compliance with the standard
- Compressive strain measurement – A Class B-2 extensometer per ASTM E83 is required by the standard to accurately measure strain. Advanced strain solutions include non-contacting extensometers, such as the Advanced Video Extensometer 2 (AVE 2) and automatic contacting extensometers, such as the AutoX 750. These solutions can result in improved repeatability as they require fewer steps to be performed by the operators. Automatic extensometry does not require the manual attachment or removal of the extensometer, resulting in less operator-influenced issues. Manual strain solutions such as clip-on extensometers also meet the measurement accuracy stated in ASTM D695.
- Reporting calculations in compliance with the standard – Instron's Bluehill® Universal software has advanced pre-built methods available with pre-configured plastic specific calculations helping to ensure compliance.
It is important to review ASTM D695-15 in order to fully understand the test setup, procedure, and results requirements.
5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: and Instron Connect – a new feature that provides a direct communication link to Service. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.
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The AutoX 750 is a high-resolution, long-travel automatic contacting extensometer. It can be mounted onto any electromechanical 3300, 5500, or 5900 table top and floor model systems, as well as LX, DX, HDX, and KN static hydraulic testing systems. It is well suited for applications involving plastics, metals, biomedical, composites, elastomers, and more. The AutoX has a maximum travel of 750 mm and accuracy of ± 1 µm.
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The 2630-100 series of extensometers offers speed of attachment and ease-of-use. The light-weight, rugged cross-brace design eliminates errors caused by physical distortion, while built-in protection ensures that damage is not caused by over-extension. The low operating-force arms of the extensometer reduce the possibility of knife-edge slippage when testing hard or smooth surfaced materials.
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The Plastics Testing Solutions brochure is a 40-page, applications-focused, and standards-based brochure. Important standards such as ISO 527-1, -2, -3, ISO 11443, ISO 75, ASTM D638, Astm D3835, are covered in a detailed testing challenge and solution format. The brochure addresses the most prominent and widely-used standards in the materials testing industry for plastics. Test types such as Impact, Rheology, Thermo-Mechanical, Specimen Preparation, Mechanical Testing, Dynamic/fatigue, and Hardness are described in great detail.
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