Cyclic loading may result in material failure. This tool predicts the fatigue curve of our grades for any given temperature and humidity. Easily calculate after how many cycles your part will fail, or how much stress it is able to endure!

Fatigue is the failure of the material (tensile bar) due to cyclic loading. Various cyclic loadings can be applied, characterized by the ratio 'R' between the minimum and the maximum amplitude.

User input:

  • Grade selection
  • Temperature of application
  • Relative humidity of application

Tool output:

  • Prediction of the fatigue curve at the selected condition
Schematic Fatigue
  • All measurements are performed according to the ISO 527 1A standard for specimen (see image) with nominal specimen thickness of 4.0 mm (0.16 in), produced by injection molding.
  • Measurements were done at a specified temperature and level of relative humidity on as-molded samples, loading conditions: sinusoidal load with load amplitude (R-value) of 0.1 and frequencies in a range of 1-10Hz.
Dimensions tensile bar according to the ISO 527 1A standard

Phenomenological fatigue model with temperature (and humidity) dependent parameters. Model predicts fatigue lifetime (number of cycles-to-failure) under isothermal conditions (excluding effects of viscous heating).



  • On average, accuracy of the lifetime predictions is within factor 3. This 'engineering accuracy' is indicated in the graph for each line by means of a semi-transparant confidence region.
  • Currently, we do not provide predictions below 0°C (32°F), above 200°C (392°F) or above 50% of relative humidity.

Please use the Hotjar feedback form on the bottom right of the Fatigue tool page to submit your comments, questions, and feedback. Most frequent questions will be answered in this section.

Why can't I select all DSM grades?

We're in the process of expanding this tool to more grades, but this depends on the availability of experimental data as well as on the demand for that particular grade. Let us know what grades you're looking for by filling in the feedback form on the bottom right of the page!

Why am I not allowed to export the data from the graph?

Everyone can use the download functionality once logged in; simply register (for free) and immediately start downloading.

Frequently asked questions