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<p>The change in moisture content (MC) will lead to a change in the mechanical properties of molded fiber products (MFP). Therefore, for predicting the mechanical properties of MFP, it is necessary to construct a mechanical constitutive model with&#xa0;the MC term. In this study, quasi-static uniaxial tensile tests of sugarcane bagasse-molded fiber products (SBMFP) were conducted at different MCs (0 ~ 17%), and the stress-strain curves were obtained. The maximum failure strength of SBMFP was achieved at 6% MC. The phenomenon of MFP, the fiber moisture swelling-induced damage, was observed by SEM of the mesoscopic fiber structure of SBMFP. To accurately predict the SBMFP’s mechanical properties at different MCs, based on the test results, a plastic constitutive model containing the MC term of SBMFP was constructed using the Geometric Linear Mapping method. Based on the constitutive model, the tensile process was simulated in Abaqus. The maximum error between the simulation results and the test data was 5.91%. The influence mechanism and the new constitutive model were validated by wheat straw-molded fiber products (WSMFP) and waste paper-molded fiber products (WPMFP). This study provides theoretical support for predicting the mechanical properties of fiber products.</p>

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Mechanism of Molded Fiber Products in Plastic Strain and the Construction of a Model of Moisture Content

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Zhiqiang Fu,
  • Hongsong Wang,
  • Liying Duan,
  • Tong Zhao,
  • Liqiang Huang,
  • Hesong Liu,
  • Zhiyong Zhao,
  • Xiaoyu Jia

摘要

The change in moisture content (MC) will lead to a change in the mechanical properties of molded fiber products (MFP). Therefore, for predicting the mechanical properties of MFP, it is necessary to construct a mechanical constitutive model with the MC term. In this study, quasi-static uniaxial tensile tests of sugarcane bagasse-molded fiber products (SBMFP) were conducted at different MCs (0 ~ 17%), and the stress-strain curves were obtained. The maximum failure strength of SBMFP was achieved at 6% MC. The phenomenon of MFP, the fiber moisture swelling-induced damage, was observed by SEM of the mesoscopic fiber structure of SBMFP. To accurately predict the SBMFP’s mechanical properties at different MCs, based on the test results, a plastic constitutive model containing the MC term of SBMFP was constructed using the Geometric Linear Mapping method. Based on the constitutive model, the tensile process was simulated in Abaqus. The maximum error between the simulation results and the test data was 5.91%. The influence mechanism and the new constitutive model were validated by wheat straw-molded fiber products (WSMFP) and waste paper-molded fiber products (WPMFP). This study provides theoretical support for predicting the mechanical properties of fiber products.