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<p>The study of the strain rate dependency of the mechanical behavior is an experimental challenge, especially for cellular and architected polymers. For these materials, two main contributions are intertwined: material (visco-elastic or elasto-visco-plastic base materials) and structural effects (gas flowing, dynamic buckling). Separating these effects is a key point to investigate their contribution to the strain-rate dependency of cellular polymers. Based on an experimental methodology using a time-temperature superposition approach, these effects and their contribution are discussed in this article. Dynamic Mechanical Analysis was used between <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(-80^{\circ }\)</EquationSource> </InlineEquation>C and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(150^{\circ }\)</EquationSource> </InlineEquation>C and between 0.01&#xa0;Hz and 1&#xa0;kHz to study this superposition at small strains. Quasi-static and dynamic tests under large strains were conducted under a large temperature range to find and study a time-temperature superposition under large strains. The comparison between both equivalence highlights the predominance of structural effects for the strain rate dependency when the constitutive material are in a rubbery state. Otherwise, the strain rate dependency is mainly caused by the visco-elastic behavior of the constitutive materials and could be well predicted by a rheological model.</p>

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Investigation of Structural Dynamic Effects on the Mechanical Behavior of a Polymeric Foam by Means of Time-Temperature Superposition

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • L. Le Barbenchon,
  • J. Girardot,
  • J.-B. Kopp,
  • P. Viot

摘要

The study of the strain rate dependency of the mechanical behavior is an experimental challenge, especially for cellular and architected polymers. For these materials, two main contributions are intertwined: material (visco-elastic or elasto-visco-plastic base materials) and structural effects (gas flowing, dynamic buckling). Separating these effects is a key point to investigate their contribution to the strain-rate dependency of cellular polymers. Based on an experimental methodology using a time-temperature superposition approach, these effects and their contribution are discussed in this article. Dynamic Mechanical Analysis was used between \(-80^{\circ }\) C and \(150^{\circ }\) C and between 0.01 Hz and 1 kHz to study this superposition at small strains. Quasi-static and dynamic tests under large strains were conducted under a large temperature range to find and study a time-temperature superposition under large strains. The comparison between both equivalence highlights the predominance of structural effects for the strain rate dependency when the constitutive material are in a rubbery state. Otherwise, the strain rate dependency is mainly caused by the visco-elastic behavior of the constitutive materials and could be well predicted by a rheological model.