Experiment and modified model for CFRP/steel hybrid tubes under the quasi-static transverse loading

Reasonable design of induced holes on thin-walled structure is beneficial to enhance the crashworthy performance of the structure. In order to improve the crashworthiness of Al/carbon fiber-reinforced polymer (CFRP) tube, the effect of induced holes on the Al/CFRP thin-walled structure was studied, and the Al/CFRP tube configuration with better overall crashworthiness was obtained by multi-objective optimization design method. First, the quasi-static axial compression tests were carried out on the intact Al/CFRP tube and the Al/CFRP tube with induced holes, and a numerical model validated by the experiment was established. Second, the parameters of the induced hole were studied numerically to explore the influence of the induced holes on the crashworthiness of the Al/CFRP tube. It was found that the diameter and number of the induced hole had a great influence on the crashworthiness and energy absorption (EA) capacity. Finally, the multi-objective optimization was performed to optimize the parameters of the induced holes by integrating the Kriging model technique and the nondominated sorting genetic algorithm (NSGA-II). Compared the optimal design with the intact Al/CFRP tube, the first peak load is reduced by 24.32% and the specific EA is slightly improved by 0.68%.

Section: Introductionmentioning

confidence: 92%

Crashworthiness analysis and multi‐objective optimization of Al/CFRP tubes with induced holes

Wang

et al. 2021

“…[33] Compared with pure CFRP tube and aluminum (Al) tube, the hybrid tube has better energy absorption capacity. [34][35][36][37] However, the deformation mode and energy absorption mechanism of a hybrid tube under axial loading are more complex than that of a single material tube. And the fabrication and experimental testing cost of the composite-metal hybrid tube is high, and more mechanical properties are needed for numerical simulation and analysis.…”

Section: Introductionmentioning

confidence: 99%

Theoretical prediction model of mean crushing force of CFRP‐Al hybrid circular tubes under axial compression

Bai

et al. 2021

Self Cite

The CFRP-Al hybrid thin-walled structure combines the dual advantages of carbon fiber reinforced plastics (CFRP) and metal, which is one of the crucial methods for both lightweight and high strength. This study aimed to explore the theoretical prediction of the mean crushing force of the hybrid tubes with different winding angles subjected to axial compression. In order to construct the theoretical model of the hybrid structural energy absorption response, the failure modes, and deformative behavior of the hybrid tubes are analyzed and summarized based on the axial compression experiments. Considering the effects of winding angles on the energy dissipation and deformation characteristic of hybrid circular tubes, the expressions of membrane force and binding energy per unit length are obtained. Then, the analytical model is established to predict the mean crushing force of the CFRP-Al hybrid circular tube. Furthermore, the results of the prediction model are compared according to different failure criteria of composite materials. The findings show that the predicted values of the maximum stress failure are more consistent with the experimental values, in which the discrepancy between analytically predicted and experimentally tested mean crushing forces of these hybrid tubes is no more than 10%. The results can provide a basis for the design of the composite-metal hybrid thin-walled tube.

“…The stress‐strain relation of AA6063 was obtained by the uniaxial tensile tests (Figure 3) and the LD6.10 100 kN universal testing machine was utilized for the tests according to the principles specified in ASTM E8M‐04. The mechanical properties of CFRP were tested by Ma et al [ 56 ] according to related test standards. [ 57 ] The related values of Al and CFRP are shown in Tables 1 and 2, respectively.…”

Section: Methodsmentioning

confidence: 99%

Structure design and multiobjective optimization of CFRP/aluminum hybrid crash box

Zha

Dong

et al. 2020

Self Cite

To improve the crashworthiness and reduce vehicle weight, a crash box made of carbon fiber reinforced plastics (CFRP)/aluminum (Al) hybrid materials was introduced in the paper. Quasistatic axial compression tests and numerical simulations were conducted for pure Al tubes and CFRP/Al hybrid tubes. The simulation models were validated and were further employed to investigate the effects of geometry, aluminum tube thickness, fiber wrapping angle and CFRP layers on the crashworthiness of the hybrid crash box under axial loading and 30 oblique collision. The multiobjectives were taken to obtain the optimal geometrical dimensions, aluminum tube thickness, wrapping angle, and the number of layers. The crashworthiness of the optimal CFRP/Al hybrid crash box was compared with that of original aluminum crash box. It was found that the mass of the crash box was reduced by 35.21%, while the specific energy absorption (SEA) and mean crushing force (F mean) were increased by more than 18% and 46%, respectively. The paper was aimed to provide some references for the design and optimization of composite crash box.