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<p>The service life of polymeric components can be significantly influenced by the environmental conditions. However, these effects are not always systematically quantified. The present study investigates the influence of ambient temperature and loading frequency on the fatigue performance of injection molded isotactic polypropylene. Special attention is given to the specimen’s surface conditions and environmental setting. Monotonic loading tests are carried out at different strain rates to establish its elastic modulus, yield stress, ultimate stress, creep behavior, fracture morphology, and optimal fatigue test conditions. Cyclical tests are performed to assess frequency effects prior to a fatigue test campaign in controlled humidity and two temperature levels. The results have shown a strong dependency on both frequency and temperature. Self-heating is observed for frequencies above 1.0&#xa0;Hz, while an increase in temperature from 24&#xa0;<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^\circ\)</EquationSource> </InlineEquation>C to 30&#xa0;<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(^\circ\)</EquationSource> </InlineEquation>C resulted in a 37% reduction in fatigue life. This pronounced thermal sensitivity underscores the potential for standard room-temperature fatigue data to generate misleading estimations of service life in engineering applications.</p>

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Monotonic and cyclical mechanical properties of injection-molded isotactic polypropylene: Effects of frequency and temperature on fatigue behavior

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • K. Sales de Oliveira,
  • T. Pandim,
  • S. M. Luz,
  • T. Doca

摘要

The service life of polymeric components can be significantly influenced by the environmental conditions. However, these effects are not always systematically quantified. The present study investigates the influence of ambient temperature and loading frequency on the fatigue performance of injection molded isotactic polypropylene. Special attention is given to the specimen’s surface conditions and environmental setting. Monotonic loading tests are carried out at different strain rates to establish its elastic modulus, yield stress, ultimate stress, creep behavior, fracture morphology, and optimal fatigue test conditions. Cyclical tests are performed to assess frequency effects prior to a fatigue test campaign in controlled humidity and two temperature levels. The results have shown a strong dependency on both frequency and temperature. Self-heating is observed for frequencies above 1.0 Hz, while an increase in temperature from 24  \(^\circ\) C to 30  \(^\circ\) C resulted in a 37% reduction in fatigue life. This pronounced thermal sensitivity underscores the potential for standard room-temperature fatigue data to generate misleading estimations of service life in engineering applications.