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<p>This study investigates the mechanical behavior of polypropylene filled with 20% talc (PP TD20) under varying strain rates and loading conditions, with particular emphasis on tension–compression asymmetry and deviation from incompressibility. A series of quasi-static and dynamic tensile and compression tests were conducted at different strain rates ranging from 1&#xa0;mm/min to 8&#xa0;m/s. Optical extensometry and image correlation techniques were employed to extract accurate displacement and strain data, ensuring spatial resolution on both the face and edge of the specimens. The results demonstrate that PP TD20 exhibits notable strain rate sensitivity in both elastic and plastic regimes. Three distinct Young’s moduli were identified, corresponding to low, moderate, and high strain rates. A tension–compression asymmetry ratio of approximately 1.5 was established, highlighting the material's differing responses under tensile and compressive loads. Furthermore, the assumption of material incompressibility was evaluated using true strain measurements from small-scale specimens, revealing a deviation from the incompressibility condition. The evolution of the transverse-to-longitudinal strain ratio during plastic flow was quantified, leading to the identification of a variable Poisson’s ratio that converges to approximately 0.07. This behavior indicates transverse isotropy rather than perfect incompressibility. The findings of this work provide crucial insights for developing constitutive models tailored to semi crystalline polymers, especially under high-deformation and impact-related applications.</p>

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Experimental Investigation of Strain Rate Sensitivity, Tension–Compression Asymmetry, and Incompressibility Deviation in Talc-Filled Polypropylene (PP TD20)

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Ravindra B. Patil,
  • Dinesh Y. Dhande

摘要

This study investigates the mechanical behavior of polypropylene filled with 20% talc (PP TD20) under varying strain rates and loading conditions, with particular emphasis on tension–compression asymmetry and deviation from incompressibility. A series of quasi-static and dynamic tensile and compression tests were conducted at different strain rates ranging from 1 mm/min to 8 m/s. Optical extensometry and image correlation techniques were employed to extract accurate displacement and strain data, ensuring spatial resolution on both the face and edge of the specimens. The results demonstrate that PP TD20 exhibits notable strain rate sensitivity in both elastic and plastic regimes. Three distinct Young’s moduli were identified, corresponding to low, moderate, and high strain rates. A tension–compression asymmetry ratio of approximately 1.5 was established, highlighting the material's differing responses under tensile and compressive loads. Furthermore, the assumption of material incompressibility was evaluated using true strain measurements from small-scale specimens, revealing a deviation from the incompressibility condition. The evolution of the transverse-to-longitudinal strain ratio during plastic flow was quantified, leading to the identification of a variable Poisson’s ratio that converges to approximately 0.07. This behavior indicates transverse isotropy rather than perfect incompressibility. The findings of this work provide crucial insights for developing constitutive models tailored to semi crystalline polymers, especially under high-deformation and impact-related applications.