- Compression tests are used to characterize a material’s behavior under compressive load.
- During the test, compression plates (or platens) are used to apply compressive pressure to a specimen, thereby determining various properties of the material.
- The test data then yields results typically in the form of a stress-strain diagram which provides elastic limit, proportional limit, yield point, yield strength, and in some cases, compressive strength, to name a few.
Compression tests examine the safety, durability, and integrity of materials and components. Common applications include plastics, ceramics, composites, and metals. These types of tests are often performed on components and finished products such as foam, pipes, water bottles, mattresses, automotive parts, cardboard, medical implants, and sports balls, among others.
The following is a list of the most common ASTM and ISO standards for compression testing:
- ASTM D3574-17: Standard Compression Test Methods for Flexible Cellular Materials—Slab, Bonded, and Molded Urethane Foams
- ASTM D695-15: Standard Compression Test Methods for Flexible Cellular Materials
- ASTM D3846-08 (2015): In-Plane Shear Strength of Reinforced Plastics
- ASTM D575-91 (2018): Compression Test on Rubber: Method A Rubber Properties in Compression
- ASTM F1306-21: Standard Test Method for Slow Rate Penetration Resistance of Flexible Barrier Films and Laminates
- ISO 7886-1:2017: Sterile hypodermic syringes for single use — Part 1: Syringes for manual use
- ISO 844:2014: Rigid cellular plastics — Determination of compression properties
There are other company-specific standards for compression testing such as Boeing BSS 7260c and Airbus AITM 1-0010 issue 3 that are also commonly used for compression testing in the aerospace industry.
- A universal testing machine (UTM) equipped with a compression test kit is used to perform the test. The kit must fit the specific test criteria of the application and take the specimen’s dimensions and expected maximum test forces into consideration.
- Lighter compression platens are used for compression tests up to a maximum load of 20 kN and heavier compression platens are best suited for tests up to 250 kN. ZwickRoell offers various types of compression platens, including round and square platens, as well as scored and smooth platens.
Compression tests are used to determine material behavior under uniformly increasing compressive loading. The compression specimen is compressed until break, until crack, or up to a specified compression value.
The compression test tools used are in direct contact with the materials to be tested. Therefore they have to be precisely aligned and adapted to the respective applications and requirements. A wide variety of compression test kits are available for all types of tests. These compression tools can be individually adapted to the specific application according to the respective requirements.