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Creep testing, also referred to as cold flow, refers to how a material slowly moves or changes shape when a load is applied. Measuring Creep typically involves applying high temperatures to a sample for long periods of time while also applying the load, so the use of Environmental Chambers along with a test frame with highly accurate speed controls is common for this type of test. Creep testing is often performed on metals that are designed to work in high stress or high temperature environments such as engine parts and related components.
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| ASTM C1291 – Standard Test Method for Elevated Temperature Tensile Creep Strain, Creep Strain Rate, and Creep Time to Failure for Monolithic Advanced Ceramics |
| ASTM C1337 – Standard Test Method for Creep and Creep Rupture of Continuous Fiber-Reinforced Advanced Ceramics Under Tensile Loading at Elevated Temperatures |
| ASTM D2990 – Standard Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics |
| ASTM D5405 – Standard Test Method for Conducting Time-to-Failure (Creep-Rupture) Tests of Joints Fabricated from Nonbituminous Organic Roof Membrane Material |
| ASTM D6383 – Standard Practice for Time-to-Failure (Creep-Rupture) of Adhesive Joints Fabricated from EPDM Roof Membrane Material |
| ASTM D7337 – Standard Test Method for Tensile Creep Rupture of Fiber Reinforced Polymer Matrix Composite Bars |
| ASTM E139 – Standard Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials |
| ASTM E292 – Standard Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials |
| ASTM E633 – Standard Guide for Use of Thermocouples in Creep and Stress-Rupture Testing to 1800°F (1000°C) in Air |
Viscosity describes how easily a liquid flows. A high-viscosity coating is thick and slow moving; a low-viscosity one is thin and runny. For paints and coatings this single property influences almost every stage of use, from how a product is pumped and dosed in production, to how it atomizes at a spray gun, to how…
Viscosity is a fluid's resistance to flow. In paints and coatings it governs how a product brushes, sprays, rolls, levels, and resists sagging, and it is one of the most routinely checked quality parameters on the line and in the lab. A coating that is too thick drags and clogs; one that is too thin…
Key terms Term Definition Viscosity A fluid's resistance to flow. Dynamic viscosity Resistance to flow under an applied shear, measured in pascal seconds (Pa.s), poise (P), or centipoise (cP). Kinematic viscosity Dynamic viscosity divided by density, measured in centistokes (cSt); what a flow cup effectively reports. Shear rate The rate at which a fluid is…
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