A novel virtual material layer model for predicting natural frequencies of composite bolted joints

• 作者: Yu YANG Hui CHENG Biao LIANG Di ZHAO Junshan HU Kaifu ZHANG
• 来源期刊: 中国航空学报（英文版）
• 年，卷（期）: 2021,（8）
• 页码范围: 101-111
• 页数: 11页
• 语种: 英文

摘要

A novel virtual material layer model based on the fractal theory was proposed to predict the natural frequencies of carbon fiber reinforced plastic composite bolted joints.Rough contact surfaces of composite bolted joints are modeled with this new proposed approach.Numerical and experimental modal analyses were conducted to validate the effectiveness of the proposed model.A good consistence is noted between the numerical and experimental results.To demon-strate the necessity of accurately modeling the rough contact surfaces in the prediction of natural frequencies,virtual material layer model was compared with the widely used traditional model based on the Master-Slave contact algorithm and experiments,respectively.Results show that the proposed model has a better agreement with experiments than the widely used traditional model(the prediction accuracy is raised by 8.77％ when the pre-tightening torque is 0.5 N-m).Real con-tact area ratio A* of three different virtual material layers were calculated.Value of A* were dis-cussed with dimensionless load P*,fractal dimension D and fractal roughness G.This work provides a new efficient way for accurately modeling the rough contact surfaces and predicting the natural frequencies of composite bolted joints,which can be used to help engineers in the dynamic design of composite materials.