Prediction of energy absorption in composite stiffeners

Laananen, David H.; Bolukbasi, Akif O.

doi:10.1016/0263-8223(95)00068-2

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…Determining energy absorption capacity. Combining the strain energy density function of the unidirectional plate under the impact, the energy absorption of the composite unidirectional plate under impact load can be obtained as follows [23][24][25][26] :…”

Section: Establishing a Mathematical Model Of Energy Recoverymentioning

confidence: 99%

Finite element analysis and energy recovery calculation of carbon fiber composite based on ANSYS software

Zheng

Zhang

Zhou

2022

Journal of Applied Biomaterials & Functional Materials

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Purpose: To study the response under impact load of carbon fiber reinforced composite materials that have excellent mechanical properties. Design/methodology/approach: Finite element analysis of unidirectional plates was conducted under unsymmetrical impact load based on drop weight impact test. At the macroscopic scale, a finite element model was built on ANSYS/LS-DYNA, which took the impact response of carbon fiber unidirectional plates as unknown quantity. The model considered the macroscopic response of carbon fiber unidirectional plates under different initial conditions, from the aspects of stress, strain, energy change and deformation degree of unidirectional plates. Finally, a mathematical model of energy recovery of carbon fiber composite materials under partial impact load was established, and the energy recovery amount under different fiber orientations was calculated on MATLAB. Findings: The impact energy absorbed by the unidirectional plate is the largest when the fiber orientation is 30°. To improve the impact resistance of unidirectional plates under unsymmetrical impact load, laying schemes should be avoided at fiber orientations of 0°, 15° and 60°, and be recommended at 30°, 45°, and 75°. For impact velocity, 4.71 and 7.54 m/s should be avoided, while 2 m/s is recommended. For the impact weight, 50 and 250 kg weights should be avoided, and 150 and 200 kg weights are recommended. Originality/value: This model not only provides reference for similar impact resistance research, but also predicts the impact response of unidirectional plates under different initial loads in the future. It can also provide reference for the structure using carbon fiber composite materials to achieve lightweight.

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Section: Establishing a Mathematical Model Of Energy Recoverymentioning

confidence: 99%

Finite element analysis and energy recovery calculation of carbon fiber composite based on ANSYS software

Zheng

Zhang

Zhou

2022

Journal of Applied Biomaterials & Functional Materials

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“…DMA measured data of dissipated energy per unit volume in one oscillatory cycle (Figure 6) were divided by the respective material densities to calculate the specific energy dissipated per cycle (energy per unit mass), as given by Equation (2). According to the data presented in Figure 7 the trends observed for the specific energy dissipated per cycle -at both temperatures evaluated -are not the same as those presented in Figure 6, when the dissipated energy was calculated per unit volume.…”

Section: Energy Dissipationmentioning

confidence: 99%

“…In the case of crashworthy structures, the components are designed to absorb significant amounts of energy under impact loading conditions. [1][2][3] Composite materials are known for their capacity of being tailored to offer a unique combination of material capabilities, which may include low-density, high-strength, high-stiffness, high damping, enhanced fatigue life, superior crashworthiness, chemical resistance and many others. Due to these exceptional characteristics, composite materials are well established in many application areas such as aeronautic and aerospace structures, automotive parts, marine structures, and sporting equipment.…”

Section: Introductionmentioning

confidence: 99%

Effect of fiber volume fraction on the energy absorption capacity of composite materials

Melo

Villena

2012

Journal of Reinforced Plastics and Composites

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In this investigation, the effect of fiber volume fraction on the energy absorption capacity of fiber-reinforced composite materials was studied using dynamic mechanical analysis measurements. Laminates were fabricated with and without vacuum bag using plain weave E-glass fabric and three types of polymer matrix: epoxy, polyester, and vinyl ester. The higher energy absorption displayed by samples processed under vacuum was related to the shorter distance between adjacent fibers which produces stresses of higher magnitude in the matrix, thus promoting higher energy dissipation. However, when the energy dissipation is divided by the material density, the higher material density of vacuum processed laminates offsets the effects of increased loss modulus at higher fiber volume fraction.

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“…According to this equation the energy absorption capability of the stiffener is inferior to that obtained from a constrained flat plate. Laananen and Bolukbasi work [6] has shown that a T650-35/F584 carbon-epoxy plain-weave angle stiffener with w=19 mm and t=2.5 mm is absorbing only 2/3 of the energy dissipated by a 50 mm wide flat plate with the same lay-up and thickness. Whereas the flat plate specimens were supported at both unloaded edges, where they tore as they crushed, the angle stiffener specimens tore only on the comer.…”

Section: Semi-empirical Calculations For the Seesmentioning

confidence: 99%

Evaluation of Crush Energy Absorption of Woven CFRP Laminates

Soutis

Poubady

1998

Advanced Composites Letters

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Axial compressive tests have been performed on several low temperature cure woven carbon fibre-epoxy laminates. A 45°chamfer was machined at one end of the plate to trigger progressive crushing. The force-deflection characteristics were almost 'ideal elastic-plastic' and the specific energy values ranged between 60-80 kJ/kg, which are comparable to values reported for carbon-epoxy and carbon-Kevlar epoxy hybrid composite plates from previously published data. Simple analytical expressions were derived for the specific sustained crushing stress in terms of plate geometry and energy dissipated in terms of tearing and delamination.

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Prediction of energy absorption in composite stiffeners

Cited by 6 publications

References 17 publications

Finite element analysis and energy recovery calculation of carbon fiber composite based on ANSYS software

Finite element analysis and energy recovery calculation of carbon fiber composite based on ANSYS software

Effect of fiber volume fraction on the energy absorption capacity of composite materials

Evaluation of Crush Energy Absorption of Woven CFRP Laminates

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