Introduction to Creep Testing Machine

 

Creep testing machine evaluates material deformation under constant stress. Measures tensile strength (kN/m, ISO 10319), creep rupture time, & strain. Used in aerospace, energy, geosynthetics (e.g., DW1290: safe, durable, customizable temp control).

Definition of creep

The phenomenon that materials slowly undergo plastic deformation under long-term constant temperature and constant stress.

Terminology of creep test

  • Tensile strength: The maximum load per unit width of a specific material when subjected to an external tensile load, measured in accordance with ISO 10319. Tensile strength is expressed in kilonewtons per meter (kN/m).
  • Pretension force: A tensile force applied to a specimen equal to 1% of the tensile strength (3.1) but not more than 10% of the tensile creep load, so that the gauge length and strain are determined under repeatable conditions.
  • Tensile creep strain: The change in tensile strain of a specimen with time under a constant tensile load.
  • Tensile creep rupture: Tensile failure of a specimen under a constant tensile load less than the tensile strength. In some materials, tensile creep rupture is preceded by an increase in the strain rate.
  • Tensile creep load: A constant tensile static load applied to a specimen per unit width. Tensile creep loads are usually expressed as a percentage of the tensile strength of the specimen. The tensile creep load includes the pretension force and, if applicable, any load applied by the loading device. The tensile creep load is expressed in kilonewtons per meter (kN/m).
  • Loading time: The time required to apply a full tensile creep load. Loading time is expressed in seconds.
  • Creep time: The time from the end of the loading time to the tensile creep rupture of the specimen.
  • Tensile creep rupture time: The time from the end of the loading time to the tensile creep rupture of the specimen. Tensile creep rupture time is expressed in hours.

Working principle of creep testing machine

The working principle of the creep testing machine is to simulate the material stress in the actual working environment by applying a constant external force or deformation to the sample, and controlling environmental factors such as temperature and humidity, and measure the deformation or stress value of the sample over time. In the creep test, the sample is usually placed in a high temperature environment to accelerate the creep process. During the test, the deformation data of the material is recorded in real time through high-precision sensors and data acquisition systems, providing a reliable basis for material performance evaluation. Find more details about creep testing machine

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