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<p>This study investigates the mechanical properties and vibration damping characteristics of bio-inspired composite core designs with varying hemp content percentages. Three different material mixes were created: Pure PLA (control sample), PLA with 2.5 wt% hemp powder, and PLA with 5 wt% hemp powder (near the upper limit for good processing). Two distinct bio-inspired geometries—Beetle Wing Inspired (BIC) and Honeycomb Inspired (HIC) configurations—were fabricated using fused deposition modeling and tested using both experimental methods and finite element analysis through ANSYS simulations. The research focused on transverse shear modulus properties and natural frequency responses using an Alternate Dynamic Method with an OROS OR34 dynamic signal analyser. Experimental results demonstrated that the BIC design consistently outperformed the HIC configuration across all hemp percentages tested, exhibiting approximately 9% higher shear modulus at baseline (0% hemp), with values of 137.4&#xa0;MPa versus 126.2&#xa0;MPa respectively. As hemp content increased from 0 to 5%, both designs showed comparable proportional decreases in shear modulus (approximately 49% reduction), revealing an inverse relationship between structural rigidity and damping capacity. Numerical simulations using ANSYS generally predicted lower frequency and shear modulus values compared to experimental measurements. For instance, at 0% hemp content, numerical methods predicted a shear modulus of 111.64&#xa0;MPa for BIC versus the experimentally measured 137.4&#xa0;MPa. Despite these quantitative differences, both methodologies validated the superior performance of the beetle wing geometry, which maintained its structural advantage regardless of material composition adjustments. The systematic integration of hemp fiber reinforcement with bio-inspired structural geometries demonstrates a promising approach for developing lightweight composite materials with optimized mechanical properties.</p>

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Vibration Technique Based Mechanical Characterization of Beetle Wing Inspired PLA-Hemp Hybrid 3D Printed Cell Cores

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Pulkit Srivastava,
  • Ananda Babu Arumugam,
  • Zacharie Ntumba,
  • Suraj Ghising

摘要

This study investigates the mechanical properties and vibration damping characteristics of bio-inspired composite core designs with varying hemp content percentages. Three different material mixes were created: Pure PLA (control sample), PLA with 2.5 wt% hemp powder, and PLA with 5 wt% hemp powder (near the upper limit for good processing). Two distinct bio-inspired geometries—Beetle Wing Inspired (BIC) and Honeycomb Inspired (HIC) configurations—were fabricated using fused deposition modeling and tested using both experimental methods and finite element analysis through ANSYS simulations. The research focused on transverse shear modulus properties and natural frequency responses using an Alternate Dynamic Method with an OROS OR34 dynamic signal analyser. Experimental results demonstrated that the BIC design consistently outperformed the HIC configuration across all hemp percentages tested, exhibiting approximately 9% higher shear modulus at baseline (0% hemp), with values of 137.4 MPa versus 126.2 MPa respectively. As hemp content increased from 0 to 5%, both designs showed comparable proportional decreases in shear modulus (approximately 49% reduction), revealing an inverse relationship between structural rigidity and damping capacity. Numerical simulations using ANSYS generally predicted lower frequency and shear modulus values compared to experimental measurements. For instance, at 0% hemp content, numerical methods predicted a shear modulus of 111.64 MPa for BIC versus the experimentally measured 137.4 MPa. Despite these quantitative differences, both methodologies validated the superior performance of the beetle wing geometry, which maintained its structural advantage regardless of material composition adjustments. The systematic integration of hemp fiber reinforcement with bio-inspired structural geometries demonstrates a promising approach for developing lightweight composite materials with optimized mechanical properties.