What Does Creep Rupture Test Mean?
A creep rupture test is a method of evaluating the amount of creep a material can withstand until it ruptures or otherwise fails. During the test, material deformation and the elapsed time are recorded. The test is performed to determine the performance characteristics and operating limitations of a material or piece of equipment. A creep rupture test differs from a creep test because the test continues until failure (rupture) occurs.
Corrosionpedia Explains Creep Rupture Test
A creep rupture test measures the amount of creep a material can withstand prior to rupture. The test involves many of the same components and devices that are required for a creep test. The material being evaluated is fabricated to a known dimension. Following its machining the material specimen is placed under a load below its yield strength. The temperature may be elevated as well, and should reflect the temperature that will be present in the application when the material is used.
Creep is a mechanical deformation process that occurs when forces below the yield strength of a material are able to alter the shape of a material. Oftentimes, materials in high temperature environments are more prone to creep, and therefore creep rupture. The closer the temperature is to the material's melting temperature the more likely it will be affected by creep. A creep rupture test takes this into account by being performed at various temperatures.