Test Method Summary
ASTM D695 examines the compressive properties of reinforced and unreinforced rigid plastics, including high-modulus composites, through a process of straining and loading the plastic at relatively low rates of strain. It enables replication of application-specific conditions. The compressive property information provides a standard and consistent means to compare materials for research and development, quality control, acceptance or rejection under specifications, and other material evaluation processes.
Critical compressive properties include modulus of elasticity, yield stress, deformation beyond yield point, and compressive strength (unless the material merely flattens but does not fracture). According to ASTM D695, the specimen is placed between compressive plates parallel to the specimen surface, and compressed along its major axis at constant rate of displacement until the specimen fractures or until the load or the decrease in length reaches a predetermined value. An extensometer attached to the fixture is used to determine the modulus of elasticity. When performing compression testing, it has been found that specimen alignment plays an important role in achieving even load distribution, which contributes to the consistency of the results.
Solutions for ASTM D695 typically include these types of components:
Load Frame Options
Both the premium MTS Criterion® and the economical MTS Exceed® universal testing machines are ideal for determining the compressive properties of plastics per ASTM D695. They both come in a variety of force capacities and frame styles, ranging from 1-column tabletops to larger 2-column floor-standing models. The 30kN and 100kN models also have dual-zone test spaces to reduce set-up times if you frequently change test requirements. And as an alternative to a new load frame, you can modernize the software and controls of your old test system with an MTS ReNew™ Upgrade.
For other options related to this standard, please download the application test method tech note on this page.