ABSTRACT

Natural fiber composites (NFC) exhibit good specific mechanical properties in comparison to synthetic fiber composites (SFC). The study investigates interlaminar glass (G) fiber hybridized jute (J) and flax (F) reinforced epoxy composites designated as JGGJ, GJJG, FGGF, and GFFG along with their virgin counterparts. Composite laminates of four plies are manufactured by hand-layup followed by compression molding to investigate tensile, flexural, and interlaminar shear properties. Further the effect of hybridization is also investigated for modal frequencies and damping ratio obtained from experimental modal analysis. Glass fiber hybridization as extreme layers shows significant improvement in flexural and shear properties as compared to tensile. Glass fiber reinforcement, as core layers improve the damping by 155.55% and 101.31% for JGGJ and FGGF, respectively, over pure glass epoxy. However with increase in bending stiffness of GJJG and GFFG, the bending modal frequency is improved. Also, the modal frequency and damping ratio increases following a power-law variation with a decrease in the free length. Finite element and analytical validations are presented to the experimental frequencies and flexural modulus, respectively. These studied hybrid composites can serve as semi-structural members like interior trim panels in automotive applications that possess significant strength and dissipate in-service vibrations effectively.

摘要

与合成纤维复合材料 (SFC) 相比，天然纤维复合材料 (NFC) 表现出良好的特定机械性能。该研究调查了称为 JGGJ、GJJG、FGGF 和 GFFG 的层间玻璃 (G) 纤维杂化黄麻 (J) 和亚麻 (F) 增强环氧树脂复合材料及其原始对应物。四层复合层压板通过手工铺层制造，然后进行压缩成型，以研究拉伸、弯曲和层间剪切性能。此外，还研究了从实验模态分析中获得的模态频率和阻尼比的混合效应。与拉伸相比，作为极端层的玻璃纤维杂交显示出弯曲和剪切性能的显着改善。玻璃纤维增​​强，作为芯层，JGGJ 和 FGGF 的阻尼分别提高了 155.55% 和 101.31%，分别在纯玻璃环氧树脂上。然而，随着 GJJG 和 GFFG 弯曲刚度的增加，弯曲模态频率有所提高。此外，随着自由长度的减小，模态频率和阻尼比随幂律变化而增加。分别对实验频率和弯曲模量进行了有限元和分析验证。这些研究过的混合复合材料可用作汽车应用中的内饰板等半结构构件，具有显着的强度并有效地消散使用中的振动。分别对实验频率和弯曲模量进行了有限元和分析验证。这些研究过的混合复合材料可用作汽车应用中的内饰板等半结构构件，具有显着的强度并有效地消散使用中的振动。分别对实验频率和弯曲模量进行了有限元和分析验证。这些研究过的混合复合材料可用作汽车应用中的内饰板等半结构构件，具有显着的强度并有效地消散使用中的振动。