Sivalingam S, Sathishkumar T P, Rajeshkumar L, Sathishkumar M
Department of Mechanical Engineering, JJ College of Engineering and Technology, Tiruchirapalli, Tamil Nadu, India.
Department of Mechanical Engineering, Kongu Engineering College, Erode, Tamil Nadu, India.
Sci Rep. 2025 Jul 24;15(1):26966. doi: 10.1038/s41598-025-12242-w.
This study focuses on the failure analysis of hybrid woven jute and glass fiber-reinforced structural composite tubes with circumferential circular holes under quasi-static testing. Process parameters were optimized to obtain outputs including maximum stress, energy absorption, and specific energy absorption by considering hole diameter, length of the tube, and number of holes drilled as input. Results portray that the crash behaviour of the composite tubes was dependent on the number of holes drilled on the circumference and the analysis of variance results revealed that the interaction between all the process parameters affected the output variables. Energy absorption and specific energy absorption were found to be maximum for the composite tubes of 70 mm length drilled with 4 holes each of diameter 12 mm. Optimal energy absorption of hybrid composite tubes was 87.11 J and the specific energy absorption was 1.527 J/g. A regression model was also developed to predict energy absorption and specific energy absorption. Confirmation experiments portrayed an appreciable correlation between the predicted and experimental values with a less than 5 % margin of error for energy absorption and a less than 2 % margin of error for specific energy absorption. The failure mechanism of the hybrid composite tubes was analyzed using photographs of the composite tubes from which the major failure mechanism was observed to be buckling failure through longitudinal crack propagation. Such short composite columns find their applications in roll-over protection in automobiles, as retrofits in construction applications and developing modular structural designs.
本研究聚焦于在准静态测试下，带周向圆孔的黄麻与玻璃纤维混杂编织增强结构复合管的失效分析。通过将孔径、管长和钻孔数量作为输入参数，对工艺参数进行优化，以获得包括最大应力、能量吸收和比能量吸收等输出结果。结果表明，复合管的碰撞行为取决于圆周上的钻孔数量，方差分析结果显示，所有工艺参数之间的相互作用会影响输出变量。对于长度为70毫米、钻有4个直径为12毫米孔的复合管，能量吸收和比能量吸收达到最大值。混杂复合管的最佳能量吸收为87.11焦耳，比能量吸收为1.527焦耳/克。还建立了一个回归模型来预测能量吸收和比能量吸收。验证实验表明，预测值与实验值之间具有显著相关性，能量吸收的误差幅度小于5%，比能量吸收的误差幅度小于2%。利用复合管的照片分析了混杂复合管的失效机制，观察到主要失效机制是通过纵向裂纹扩展导致的屈曲失效。这种短复合柱可应用于汽车的翻车保护、建筑应用中的改造以及开发模块化结构设计。
