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<p>The knitted-structure reinforced shape memory polymer composites (SMPCs) has the advantages of large recovery deformation while the weft plain knitted fabric reinforced SMPC has bad shape memory performance due to the feature of self-curling. To eliminate the influences of internal stress caused by self-curling, this work presents the mirror-symmetrical layup method to fabricate the multilayer weft plain knitted fabric reinforced SMPCs. The effects of layup numbers, loop densities and directions (0°/90°) on the shape memory properties of SMPCs under tensile and U-shaped bending load were systematically investigated. The results show that during both the tensile and U-shaped bending tests, the shape recovery ratios of SMPCs in the 0° direction are significantly higher than those of SMPCs in the 90° direction. As compared with the two-layers SMPC, the shape recovery ratios of six-layers SMPC with the tensile and U-shaped bending tests decrease. In contrast, the tensile and U-shaped bending recovery forces of six-layers SMPC in the 90° direction are obviously higher than those of the SMPC with two layers. The shape memory cycle tests of multilayer knitted SMPCs were also conducted to evaluate and discuss the stability of shape recovery ratio and recovery force of SMPCs under tensile and U-shaped bending load. These findings are beneficial for the structural design and optimization of SMPCs.</p>

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Shape Memory Properties of Mirror-Symmetric Weft Plain Knitted Fabric–Reinforced Polymer Composites Under Tensile and U-Bending Loads

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • Zhihui Li,
  • Wenqing Du,
  • Yang Liu,
  • Yiwei Ouyang

摘要

The knitted-structure reinforced shape memory polymer composites (SMPCs) has the advantages of large recovery deformation while the weft plain knitted fabric reinforced SMPC has bad shape memory performance due to the feature of self-curling. To eliminate the influences of internal stress caused by self-curling, this work presents the mirror-symmetrical layup method to fabricate the multilayer weft plain knitted fabric reinforced SMPCs. The effects of layup numbers, loop densities and directions (0°/90°) on the shape memory properties of SMPCs under tensile and U-shaped bending load were systematically investigated. The results show that during both the tensile and U-shaped bending tests, the shape recovery ratios of SMPCs in the 0° direction are significantly higher than those of SMPCs in the 90° direction. As compared with the two-layers SMPC, the shape recovery ratios of six-layers SMPC with the tensile and U-shaped bending tests decrease. In contrast, the tensile and U-shaped bending recovery forces of six-layers SMPC in the 90° direction are obviously higher than those of the SMPC with two layers. The shape memory cycle tests of multilayer knitted SMPCs were also conducted to evaluate and discuss the stability of shape recovery ratio and recovery force of SMPCs under tensile and U-shaped bending load. These findings are beneficial for the structural design and optimization of SMPCs.