Compression testing is an important stage that enables manufacturers to assess the safety and integrity of materials, components, and products during different phases of the manufacturing process. The possible applications can differ from strength testing of a car windshield to stamina testing of concrete beams used in construction.
Materials that exhibit high tensile strength incline to (but do not always!) Show low compressive strength. Likewise, materials high in compressive strength incline to exhibit low tensile strength. Therefore, compression testing is mostly used on brittle materials such as concrete, plastics, metals, ceramics, composites, and corrugated materials such as cardboard. These are the materials that are often used in a load-bearing capacity wherein their integrity under compressive forces is crucial. You can look for good quality Compression testing machines and ensure that you have the best ones in hand. After all, if the equipment you are using for testing is not good, the results might not be reliable too.
Tests Performed on Finished Products
Contrary to tensile tests, that are usually conducted to decide the tensile properties of a specific material, compression tests are most of the times performed on finished products. Common items such as tennis balls, water bottles, golf balls, protective cases, plastic pipes, and furniture are all examples of products that require to be evaluated for their compressive strength.
Moreover, as an example, an engineer may want to conserve plastic by forming water bottles with thinner walls, but the bottles should still be strong enough to be packed in pallets and stacked on top of each other for transport. Compression testing might help the engineer fine tune the balance between product strength and overall material conservation.
Ultimate Compressive Strength
The ultimate compressive strength of an item or material is the value of compressive stress reached when the material fails completely. Once the brittle materials reach their ultimate compressive strength they are crushed, and the load drips drastically. Materials with higher ductility, (most plastics) do not rupture, but rather they continue deforming until the load is no longer being applied to the specimen, but rather between the two compression platens. In such instances, compressive strength can be reported as particular deformations like original height of 1%, 5%, or even 10% of the test specimens.
Testing Standards Specific to Industry
There are plentiful ASTM and ISO standards linked with compression testing a variety of materials. For example, the automotive, furniture, and mattress industries follow ASTM D3574, which gages the indention force deflection of polyurethane foam. It is a test that measures the initial softness of the foam by gaging the force when the foam is compressed to 25% of its original density. The test then measures how supportive it is by gaging the force when it is compressed to 65% of its original thickness. Automotive seating engineers stipulate the indentation force deflection value of the foam they look for in their final product, and the manufacturing location is going to perform the test several times per shift to ensure that each and every seat getting manufactured has the same feel in respect of softness and supportiveness.
So, you must get the best options in compression testing equipment and ensure that your testing is done in a proper and reliable manner. After all, testing is crucial for any and every manufacturer in every field.