Creep Testing

Creep test is a kind of material mechanical property test to determine the slow plastic deformation of metal materials under the action of constant temperature and constant stress for a long time. The deformation is recorded at a specified time interval and the curve of creep versus time is drawn. The slope of the curve at any point is the creep rate. The main factors affecting the creep test results are temperature stability, deformation measurement accuracy and sample processing technology. Creep testing is very important for materials required for certain operating temperatures under load, because large strain occurs with the passage of time, and the strain rate is very sensitive to temperature. Through the results of the creep test, the engineer can determine the expected deformation of the material and avoid failure when designing a new system for different environmental conditions. T, C&A Lab performs the creep test in accordance with industry standards and specifications, including ASTM and ISO standards. Our creep testing capabilities include, but are not limited to welding, polymers and adhesives.

The creep tests we provide include but are not limited to:

• High temperature creep test

Due to the different ways of applying stress, high temperature creep can be divided into high temperature compression creep, high temperature tensile creep, high temperature bending creep and high temperature torsional creep. High temperature creep is more effective than high temperature strength in predicting the strain trend and fracture life of materials when used for a long time at high temperatures. It is one of the important mechanical properties of materials, and it is related to the material and its structural characteristics.

• Durable strength test

The endurance strength test is usually carried out under constant temperature and load. The criterion of creep rupture resistance is the endurance strength limit, that is, the maximum stress that does not produce fracture at a certain temperature and within a specified time. For some components that do not consider the deformation variables and only consider the service life during high-temperature operation, the endurance strength limit is an important design basis. The endurance strength test is similar to the creep test, but only the breaking time of the sample is determined during the test.

• Stress relaxation test

The stress relaxation test is usually carried out at high temperature. It can be used to determine the initial stress required for the bolted parts to maintain sufficient tightening force during long-term use at high temperatures, to predict the reduction of gasket tightness and spring elasticity, and the stability of steel bars in prestressed concrete, and to determine the heat treatment conditions needed to eliminate residual stress in forgings, castings and weldments.

• Compression creep test

A test for determining the increase of compression deformation of materials with time under specified loads.

Standards we test to

In addition, the experts in our Creep Testing Laboratory also provide a variety of custom tests as you needs and standards. Let's discuss the customized service with our experts for free.

Instruments and data

Reference

1. Bueno, L. O.; et al. Correlation between creep and hot tensile behaviour for 2.25 Cr-1Mo steel from 500°C to 700°C Part 1: An Assessment According to usual Relations Involving stress, temperature, strain rate and Rupture Time. Matéria (Rio de Janeiro) 17.3 (2012): 1098-1108.

Note: this service is for Research Use Only and Not intended for clinical use.

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