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<p>The fused deposition modeling (FDM) additive manufacturing process is widely used due to its flexibility. However, the pronounced anisotropy induced by its layer-by-layer deposition makes accurately characterizing material mechanical properties under complex stress states challenging. This study focuses on shape memory polyester (SMP) specimens fabricated via FDM and investigates their mechanical behavior under multiple loading conditions through uniaxial compression, pure torsion, and combined compression-torsion experiments. The findings reveal that the SMP exhibits brittle fracture under pure torsion. However, with the introduction of compressive stress, the material response transforms from brittle to ductile, accompanied by noticeable plastic flow prior to fracture. Under combined compressive-torsional loading, the shear stress at the material’s yield point increases with a higher shear-compression stress ratio, while the compressive stress at yield shows the opposite trend. Both stress components, however, remain lower than the material strength under the corresponding individual loading condition. Furthermore, the compressive stiffness under combined loading exceeds that under uniaxial compression, which may be attributed to a tension/compression-shear coupling effect inherent in this 3D-printed material. This indicates that for FDM-fabricated SMP, compressive stress promotes shear plastic deformation, while shear stress enhances the material’s compressive resistance to some extent. This study provides experimental support and mechanistic analysis for investigating the mechanical behavior of additively manufactured polymers under complex stress states, contributing to the reliable design and application of such materials in demanding mechanical environments.</p>

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Mechanical Behavior of Additively Manufactured Shape Memory Polyester Under Combined Compressive-Shear Stress States

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Qingfei Ren,
  • Yongrou Zhang,
  • Lingling Hu,
  • Qinxia Yang,
  • Mingzhe Zhou

摘要

The fused deposition modeling (FDM) additive manufacturing process is widely used due to its flexibility. However, the pronounced anisotropy induced by its layer-by-layer deposition makes accurately characterizing material mechanical properties under complex stress states challenging. This study focuses on shape memory polyester (SMP) specimens fabricated via FDM and investigates their mechanical behavior under multiple loading conditions through uniaxial compression, pure torsion, and combined compression-torsion experiments. The findings reveal that the SMP exhibits brittle fracture under pure torsion. However, with the introduction of compressive stress, the material response transforms from brittle to ductile, accompanied by noticeable plastic flow prior to fracture. Under combined compressive-torsional loading, the shear stress at the material’s yield point increases with a higher shear-compression stress ratio, while the compressive stress at yield shows the opposite trend. Both stress components, however, remain lower than the material strength under the corresponding individual loading condition. Furthermore, the compressive stiffness under combined loading exceeds that under uniaxial compression, which may be attributed to a tension/compression-shear coupling effect inherent in this 3D-printed material. This indicates that for FDM-fabricated SMP, compressive stress promotes shear plastic deformation, while shear stress enhances the material’s compressive resistance to some extent. This study provides experimental support and mechanistic analysis for investigating the mechanical behavior of additively manufactured polymers under complex stress states, contributing to the reliable design and application of such materials in demanding mechanical environments.