Experimental investigation of the influence of substrates’ fibers orientations on the impact response of composite double-lap joints

Hazimeh, Rachad; Challita, Georges; Khalil, Khaled; Othman, Ramzi

doi:10.1016/j.compstruct.2015.08.040

Cited by 20 publications

(17 citation statements)

References 32 publications

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“…The results show an overall reduced lap shear strength for configuration 90 , in accordance with results available in literature. 15 The fracture surfaces in Figure 19 show that the failure does not occur in the welding interface but within the 45 and 135 ply for configuration 90 , explaining the lower lap shear strength.…”

Section: Effect Of Fibre Orientation On Mechanical Performancementioning

confidence: 95%

“…The highest static lap shear strength is observed with fibres oriented in the same direction as the loading. 15,16 In contrast, a 45 interface ply improves the fatigue strength and resistance to crack propagation. 17 Those conclusions are based on adhesively bonded adherends.…”

Section: Introductionmentioning

confidence: 99%

“…Figure15. Temperature measurement at the weld overlap centre (dotted line), longitudinal edge (dashed line) and outside the weld overlap (solid line) for sample with 30 Â 17 mm 2 energy director.…”

mentioning

confidence: 99%

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Static ultrasonic welding of carbon fibre unidirectional thermoplastic materials and the influence of heat generation and heat transfer

Köhler

Villegas

Dransfeld

et al. 2021

Journal of Composite Materials

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Ultrasonic welding is a promising technology to join fibre-reinforced thermoplastic composites. While current studies are mostly limited to fabric materials the applicability to unidirectional materials, as found in aerospace structures, would offer opportunities for joining primary aircraft structures. However, due to the highly anisotropic flow of a molten unidirectional ply undesired squeeze flow phenomena can occur at the edges of the weld overlap. This paper investigates how the fibre orientation in the plies adjacent to the weld line influences the welding process and the appearance of edge defects. Ultrasonic welding experiments with different layups and energy director configurations were carried out while monitoring temperatures at different locations inside and outside the weld overlap. The joints were characterized by single lap shear tests, analysis of corresponding fracture surfaces and microscopic cross-sections. Results showed that the anisotropic flow and the anisotropic thermal conductivity of the plies adjacent to the weld line have a distinct effect on the appearance and location of edge defects. By using energy directors that cover only part of the weld overlap area a new approach was developed to mitigate edge defects caused by the highly directional properties of the unidirectional plies.

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Section: Effect Of Fibre Orientation On Mechanical Performancementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Static ultrasonic welding of carbon fibre unidirectional thermoplastic materials and the influence of heat generation and heat transfer

Köhler

Villegas

Dransfeld

et al. 2021

Journal of Composite Materials

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“…In [20], the influence of some adherents' properties on natural vibration of a double-lap joint was examined. One can cite many numerical works carried out in this field [21][22][23][24][25] and experimental works [26,27]. In those works, both metallic and composite substrates were considered.…”

Section: Introductionmentioning

confidence: 99%

Investigation of vibration modes of a double-lap bonded joint

2019

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The authors were concerned in this work in examining the influence of many mechanical and geometrical parameters on the mode shapes of vibration of a double-lap bonded joint. The parameters varied in this study were: adhesive Young's modulus, adhesive and adherents' thicknesses and overlap length. The substrates were made from steel; the adhesive is an epoxy resin. The study was carried out using ANSYS Finite Element software where the first ten modes were extracted. The results obtained from an experimental test conducted by the same workgroup were used to validate the numerical results. Based on the numerical parametric study, the results have shown a dominant influence of the substrates' thickness and the overlap length: the natural frequency increases remarkably with those two parameters. Moreover, the frequencies of the first ten modes were found to be very sensitive in increasing with the increment of either the adherents' thicknesses or the overlap length. On the other hand, the influence of the adhesive Young's modulus was found to be very slight on increasing the natural frequencies for all modes while the adhesive thickness was found to have quite no influence for the first couple of modes, with a slight decrement of frequency for higher modes. Finally, by setting the latter parameters to reference values, a unified parameter function of overlap length and adherent thickness was defined and approximated, and analytical relations for natural frequencies of the first ten modes were established. Keywords Modal analysis • Adhesive • Double-lap joint • Finite element List of symbols a Overlap length (mm) L Length of plates (mm) E Adhesive Young's modulus (GPa) t a Adhesive thickness (mm) t c Central plate's thickness (mm) t e Exterior plates' thickness (mm) W Structure width (mm) ω Natural frequency of the structure (Hz)

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“…They showed that the effect of the loading rate on the maximum failure load increased with the temperature. Hazimeh et al 25 measured the impact responses of double-lap composite assemblies by the SHPB setup, in which they revealed that the shear strength and failure strain were sensitive to loading rate and the substrates' fiber orientation. Then Hazimeh et al 26,27 numerically exploited the stress distribution and heterogeneity in double-lap glass/PEEK composite joints tested with modified SHPB apparatus.…”

Section: Introductionmentioning

confidence: 99%

Dynamic strength of adhesively bonded composite joints with similar and dissimilar assembled adherends

2017

Journal of Reinforced Plastics and Composites

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The effect of similar versus dissimilar assembled adherends, on the dynamic strength of single-lap, adhesively bonded composite joints is investigated. The assembled adherend materials include titanium, aluminum and composite. To this end, split Hopkins pressure bar is used to assess the strength of the joints at high loading rates. The tests show that the dynamic strength of the joints is influenced by the assembled adherend material stiffness, and the highest strength is achieved when using high stiffness adherend materials. Numerical results conclude that the increase in the stiffness of the assembled adherend material alleviates the stress concentration and promotes a more uniform distribution of stresses in the adhesive. The results of this study indicate that the selection of assembled adherend material should be accounted for while designing adhesively bonded composite joints.

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Experimental investigation of the influence of substrates’ fibers orientations on the impact response of composite double-lap joints

Cited by 20 publications

References 32 publications

Static ultrasonic welding of carbon fibre unidirectional thermoplastic materials and the influence of heat generation and heat transfer

Static ultrasonic welding of carbon fibre unidirectional thermoplastic materials and the influence of heat generation and heat transfer

Investigation of vibration modes of a double-lap bonded joint

Dynamic strength of adhesively bonded composite joints with similar and dissimilar assembled adherends

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