Comparison of collision test results for center-pillar reinforcements with TWB and CR420/CFRP hybrid composite materials using experimental and theoretical methods

Lee, Min-sik; Seo, Hyung-Yoon; Kang, Chung Gil

doi:10.1016/j.compstruct.2017.02.068

Cited by 41 publications

(16 citation statements)

References 16 publications

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“…Reuter and Tröste [31] experimentally and numeically investigated the crashworthiness characteristics of aluminum/CFRP hybrid tubes subjected to axial loading condition, and SEA was improved by 37% compared with a pure aluminum tube. Lee et al [32] performed collision tests to compare the fracture toughness of the center-pillar reinforcements between tailor welded blanks (TWB) and steel/CFRP hybrid materials. The results showed that the weight of the center-pillar reinforcements made of hybrid composite materials decrease by 44%, and meanwhile the fracture toughness was improved compared to its TWB counterpart.…”

Section: Introductionmentioning

confidence: 99%

Crashworthiness Analysis and Design of Metal/CFRP Hybrid Structures Under Lateral Loading

et al. 2019

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Recently, published research indicates that metal/composite hybrid structures, which combine the excellent specific strength and stiffness of composites with the competitive material cost and toughness of metals, have shown superior performance under axial and oblique loadings. Nevertheless, the crushing behaviors under lateral loading are still rarely reported. In this paper, lateral quasi-static planar crushing tests were carried out to investigate the mechanical response and crushing behaviors for aluminum/CFRP hybrid tubes with different configurational schemes (H-I and H-II) by comparing with their counterparts made of singular material (pure aluminum tube and pure CFRP tube). The experimental results indicated that pure aluminum tube showed a stable crushing process and possessed higher EA and SEA compared with CFRP tube. In addition, the EA of H-II hybrid tube was considerably much higher than that of the summation of their constituent components (increased by 110%). The SEA of H-II hybrid tube increased by 90% compared with aluminum tube. In order to further explore the energy-absorbing mechanisms of H-II hybrid tube, the numerical simulations were performed by adopting effective constitutive model and multilayer modeling technique. Based on the developed finite element model, a systematical parametric study was conducted to explore in detail the effects of aluminum wall thickness, the number of CFRP layers, as well as, fiber orientation on the crashworthiness of H-II hybrid tube, and the contribution of different energy-absorbing mechanisms to total energy absorption was quantified. It was found that varying aluminum wall thickness and the number of CFRP layers not only had a great influence on energy absorbed by different mechanism but also was capable to affect lateral stiffness, EA, and SEA of H-II hybrid tube. Finally, the H-II hybrid tube was further optimized by using a discrete optimization method to improve its crashworthiness characteristics, and the results showed that the SEA was improved by 67.9% from the initial design. INDEX TERMS Carbon fiber reinforced plastic (CFRP), hybrid structures, lateral loading, numerical simulation, crashworthiness, lightweight.

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Section: Introductionmentioning

confidence: 99%

Crashworthiness Analysis and Design of Metal/CFRP Hybrid Structures Under Lateral Loading

et al. 2019

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“…When the CFRTP was pressurized twice more under the same conditions, the tensile strength was increased to 495 MPa. 18,22 manufactured and applied CFRTS/Steel hybrid composite materials to automobile body part as alternative material. Furthermore, the average impact absorbed energy per cross section area is 14.2 J/cm 2 in the CFRTP, which is higher by 1.0 J/cm 2 than CFRTS.…”

Section: Declaration Of Conflicting Interestsmentioning

confidence: 99%

Investigation of optimal lamination condition of CFRTP by compression molding method and a comparison of mechanical properties with CFRTS

Kim

Jin

Lee

et al. 2020

Advances in Mechanical Engineering

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The variables of die temperature, pressure, time, lamination method, and forming count are applied to fabricate thermosoftening CFRP (CFRTP) with compression molding method. The mechanical properties of CFRTP are compared with those of thermosetting CFRP (CFRTS). The first lamination method is that one hotmelt is inserted into carbon fiber (five carbon fibers and four hotmelts). The optimal lamination conditions are the die temperature of 220°C, pressure of 6 MPa, and pressurization time for 10 min. The tensile strength of CFRTP of this lamination method is 400 MPa. For higher tensile strength value, the second lamination method was applied. CFRTP prepreg was prepared with one hotmelt and one carbon fiber by applying die temperature at optimal lamination conditions. Five CFRTP prepregs were laminated under the same conditions. When the CFRTP sheet was three formings, the tensile strength of 494 MPa could be obtained. CFRTS are prepared by laminating the epoxy prepregs at 140°C with the compressive pressure of 0.5 MPa for 30 min. CFRTP sheet has the lower tensile strength than CFRTS sheet by 223 MPa, but the flexural strength was higher by 61 MPa and by 1.0 J/cm2 for Charpy impact test.

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“…When the stiffness decays to zero, the interface element fails, and the delamination damage expands, causing it to fail. The power exponential criterion 33 and the BK criterion 34 can be used to predict the process of the delamination damage interface stiffness decaying to zero under a mixed load. The power exponential criterion is selected in this paper.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…When the stiffness decays to zero, the interface element fails, and the delamination damage expands, causing it to fail. The power exponential criterion 33 2to equation (8). Fiber failure when it is subjected to tension ( 11 4 0) is shown in equation (2…”

Section: Cohesive Theorymentioning

confidence: 99%

Experimental and numerical analyses of stiffened composite panels with delamination under a compressive load

Bai

Song

et al. 2019

Journal of Composite Materials

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L-shaped stiffened composite panels provide an efficient structure for engineering applications. However, they often produce delamination in the preparation and service process due to a series of factors. To study the effect of different types of delamination on the compressive strength of stiffened composite panels, ABAQUS finite element software was used in combine with the progressive damage subroutine user-defined field variable (USDFLD), and the finite element model was established based on cohesive theory to realize the prediction of the progressive failure process and strength of the stiffened composite panels. The results showed that the delamination of a stringer had a greater impact on the strength of the stiffened composite panels than did the debonding between the skin panel and a stringer and the delamination of the skin panel. The debonding delamination and delamination of a stringer exhibited delamination growth near the damage position during static compression, but delamination of the skin panel exhibited no delamination growth. The experimental results were in good agreement with the finite element simulation results, which verified the validity of the finite element model.

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Comparison of collision test results for center-pillar reinforcements with TWB and CR420/CFRP hybrid composite materials using experimental and theoretical methods

Cited by 41 publications

References 16 publications

Crashworthiness Analysis and Design of Metal/CFRP Hybrid Structures Under Lateral Loading

Crashworthiness Analysis and Design of Metal/CFRP Hybrid Structures Under Lateral Loading

Investigation of optimal lamination condition of CFRTP by compression molding method and a comparison of mechanical properties with CFRTS

Experimental and numerical analyses of stiffened composite panels with delamination under a compressive load

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