Standard Test Method for Compressive Properties of Rigid Plastics
Understanding how a polymer or other material will deform under load allows
product developers to select the correct material for a given application.
As an example, manufacturing a polymer part from a material that compresses
easily under pressure knowing that the part needs to offer resistance to
loads placed upon it would make little sense.
Possible reasons why a company might request Compressive Analysis include:
- Assistance With a Materials Selection Process
- Analysis of Parts Suspected to Have Deformed Unexpectedly
Below you will find a brief description of the ASTM Test Method related to the topics covered above:
Significance and Use
Compression tests provide information about the compressive properties of plastics when employed under conditions approximating those under which the tests are made.
Compressive properties include modulus of elasticity, yield stress, deformation beyond yield point, and compressive strength (unless the material merely flattens but does not fracture). Materials possessing a low order of ductility may not exhibit a yield point. In the case of a material that fails in compression by a shattering fracture, the compressive strength has a very definite value. In the case of a material that does not fail in compression by a shattering fracture, the compressive strength is an arbitrary one depending upon the degree of distortion that is regarded as indicating complete failure of the material. Many plastic materials will continue to deform in compression until a flat disk is produced, the compressive stress (nominal) rising steadily in the process, without any well-defined fracture occurring. Compressive strength can have no real meaning in such cases.
Compression tests provide a standard method of obtaining data for research and development, quality control, acceptance or rejection under specifications, and special purposes. The tests cannot be considered significant for engineering design in applications differing widely from the load-time scale of the standard test. Such applications require additional tests such as impact, creep, and fatigue.
Before proceeding with this test method, reference should be made to the ASTM specification for the material being tested. Any test specimen preparation, conditioning, dimensions, and testing parameters covered in the materials specification shall take precedence over those mentioned in this test method. If there is no material specification, then the default conditions apply. Table 1 in Classification D 4000 lists the ASTM materials standards that currently exist.
1.1 This test method covers the determination of the mechanical properties of unreinforced and reinforced rigid plastics, including high-modulus composites, when loaded in compression at relatively low uniform rates of straining or loading. Test specimens of standard shape are employed. This procedure is applicable for a composite modulus up to and including 41,370 MPa (6,000,000 psi).
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
Note 1—For compressive properties of resin-matrix composites reinforced with oriented continuous, discontinuous, or cross-ply reinforcements, tests may be made in accordance with Test Method D 3410/D 3410.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. A specific precautionary statement is given in 13.1.
Note 2—This test method is technically equivalent to ISO 604.
2. Referenced Documents
- D3410/D3410M Test Method for Compressive Properties of Polymer Matrix Composite Materials with Unsupported Gage Section by Shear Loading
- D4000 Classification System for Specifying Plastic Materials
- D4066 Classification System for Nylon Injection and Extrusion Materials (PA)
- D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
- D618 Practice for Conditioning Plastics for Testing
- D638 Test Method for Tensile Properties of Plastics
- D883 Terminology Relating to Plastics
- E4 Practices for Force Verification of Testing Machines
- E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- E83 Practice for Verification and Classification of Extensometer Systems
compressive properties; compressive strength; modulus of elasticity; plastics; Compression testing--plastics; Loading tests--plastics; Rigid plastics; ICS Number Code 83.080.01 (Plastics in general)
( Download ASTM D695 From www.ASTM.org )