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<p>In this paper, sustainable hyperelastic composites have been developed through selective laser sintering (SLS) additive manufacturing (AM), and their dynamic mechanical properties have been thoroughly studied. In this context, thermoplastic polyurethane (TPU) with various weight fractions (0, 10, and 20 wt%) of waste ground tire rubber (GTR) blends was synthesized in a lab-scale environment. An overall dynamic mechanical characterization was conducted, focused mainly on critical mechanical properties extracted by uniaxial quasi-static tensile and compression testing, while the dynamic properties were assessed through loading-unloading testing, dynamic mechanical analysis (DMA), and modal testing. The interfacial bonding between the matrix and the filler was achieved without the need for chemical compatibilizers. The interfacial and filler dimensions were quantified through scanning electron microscopy (SEM) and incorporated into a representative volume element (RVE) finite element (FE) model. The results indicated that the incorporation of GTR significantly improves the damping performance of the TPU-based composites, as demonstrated by three different measuring techniques. Specifically, the damping increased by approximately 22% and 40% for 10 wt% and 20 wt% GTR/TPU in loading-unloading tests, 20.6% and 40.4% in DMA tests, and 21.8% and 39.1% in modal testing, respectively. Additionally, the energy absorption efficiency improved by 17% and 58% for the 10 wt% and 20 wt% GTR/TPU composites, respectively. The results of the FE analysis exhibited good agreement with the experimental tensile test data. Overall, the SLS technique enabled the effective exploitation of the cross-linked waste material, which is challenging to process using conventional manufacturing techniques.</p>

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Dynamic-mechanical investigation of thermoplastic polyurethane/ground tire rubber composites through selective laser sintering additive manufacturing

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Ioannis Filippos Kyriakidis,
  • Nikolaos Kladovasilakis,
  • Apostolos Korlos,
  • Dimitrios Tzetzis,
  • Eleftheria Maria Pechlivani,
  • Konstantinos Tsongas

摘要

In this paper, sustainable hyperelastic composites have been developed through selective laser sintering (SLS) additive manufacturing (AM), and their dynamic mechanical properties have been thoroughly studied. In this context, thermoplastic polyurethane (TPU) with various weight fractions (0, 10, and 20 wt%) of waste ground tire rubber (GTR) blends was synthesized in a lab-scale environment. An overall dynamic mechanical characterization was conducted, focused mainly on critical mechanical properties extracted by uniaxial quasi-static tensile and compression testing, while the dynamic properties were assessed through loading-unloading testing, dynamic mechanical analysis (DMA), and modal testing. The interfacial bonding between the matrix and the filler was achieved without the need for chemical compatibilizers. The interfacial and filler dimensions were quantified through scanning electron microscopy (SEM) and incorporated into a representative volume element (RVE) finite element (FE) model. The results indicated that the incorporation of GTR significantly improves the damping performance of the TPU-based composites, as demonstrated by three different measuring techniques. Specifically, the damping increased by approximately 22% and 40% for 10 wt% and 20 wt% GTR/TPU in loading-unloading tests, 20.6% and 40.4% in DMA tests, and 21.8% and 39.1% in modal testing, respectively. Additionally, the energy absorption efficiency improved by 17% and 58% for the 10 wt% and 20 wt% GTR/TPU composites, respectively. The results of the FE analysis exhibited good agreement with the experimental tensile test data. Overall, the SLS technique enabled the effective exploitation of the cross-linked waste material, which is challenging to process using conventional manufacturing techniques.