Damage accumulation mechanism of composite laminates subjected to repeated low velocity impacts

Liao, Binbin; Zhou, Jianwu; Li, Ying; Wang, Panding; Li, Xi; Gao, Ruxin; Bo, Ke; Fang, Daining

doi:10.1016/j.ijmecsci.2020.105783

Cited by 68 publications

(29 citation statements)

References 44 publications

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“…The increase of F Max in the repeated impact was also found in Ref. 31,29 . It was unexpected since the delamination damage created by the first impact would reduce the stiffness of composites, which should result in a decrease rather than an increase in the peak force during the multiple impacts under the same impact energy level.…”

Section: Impact Force-time Responsesupporting

confidence: 78%

“…Based on the test results, they concluded that the cross-ply and non-symmetric laminates had a better endurance against low impact events than unidirectional laminates because of multidirectional reinforcement. Liao et al 29 considered the effect of impactor diameter on the damage accumulation of CFRP laminates under repeated impacts, and proposed a damage index to distinguish the occurrence of penetration. In the paper, 30 the symmetric laminate with dissimilar interfaces was proved to have the great endurance against repeated impact.…”

Section: Introductionmentioning

confidence: 99%

“…The significant reduction in strength and stiffness of composite structures was dominated by severe damages like fiber breakage and penetration. 29 In order to achieve this particular failure mode, a large number of impact times or the relatively higher energy level were usually adopted in the repeated impact procedure. Generally speaking, the dynamic mechanical response is able to reflect the impact resistance of composite structure under different impact conditions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Changes in dynamic mechanical behavior of carbon fiber reinforced polymer laminates under multiple low energy impacts

Zhou

Wang

2022

Journal of Composite Materials

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Composite laminates used in aircraft structures are easily subjected to multiple impacts during their service period. The detailed analysis of impact responses could reflect the stiffness of composite structure. Nevertheless, the impact response of laminates with a large width-thickness ratio is quite different from that of ordinary laminates. The deflection could reach several times the thickness during the impact. The present paper performed an experimental study using drop weight equipment to investigate the changes in dynamic mechanical behavior of carbon fiber reinforced polymer(CFRP) laminates during multiple low energy impacts. Three kinds of impact energy levels of 5, 10 and 15J were applied for the single impact event. The specimens impacted at 5 and 10J were then subjected to subsequent impacts in order to explore the differences between single and multiple strikes with the same total impact energy. The global mechanical responses during each impact procedure were recorded and analyzed by the changes of impact force, contact time, peak energy moment, energy absorption and displacement after every single impact. Although the first strike had introduced damages into the plates, the peak force and maximum displacement increased unexpectedly rather than decreased during the second strike. Meanwhile, the damage was evaluated using ultrasonic C-scan and visual inspection. The results indicated that the multiple impacts did not produce as much damage as the first strike. Short matrix cracks were observed at the edge of the dent except for the single impact with 5J energy.

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Section: Impact Force-time Responsesupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in dynamic mechanical behavior of carbon fiber reinforced polymer laminates under multiple low energy impacts

Zhou

Wang

2022

Journal of Composite Materials

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“…Several works regarding this behaviour are available in the literature. 6,15,29 The studies conducted by Wyrick and Adams 30 on a carbon/epoxy laminate suggest the first explanation of this phenomenon. They attributed the initial increase in peak force to the thin layer of unreinforced matrix on the impacted surface.…”

Section: Resultsmentioning

confidence: 96%

“…Several studies regarding the effects of repeated impacts on the mechanical properties of composite structures can be found in the literature. 3,4,5 Among these studies, Liao et al 6 investigated the mechanical response of carbon fibre reinforced laminates subjected to repeated low-velocity impacts at an energy of 15 J, and varying the diameter of the impactor. Moreover, a new damage index (DI-B), based on the reduction of bending stiffness and expressed by the ratio between the maximum displacement recorded during the repeated impact tests and the maximum displacement as the penetration happens, allowed to evaluate the bending stiffness reduction rate, to characterise the damage accumulation and to distinguish the occurrence of penetration simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Response of glass/carbon hybrid composites subjected to repeated low velocity impacts

Donadio

Ferraro

Lopresto

et al. 2022

Journal of Composite Materials

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This work investigated the effect of repeated low-velocity impacts at different energy levels on vinyl ester composite laminates. In particular, hybrid composite laminates made by carbon woven fabric and glass woven fabric impregnated by vinyl ester resin were subjected to 1, 5 and 10 impacts for three different energy levels (U=5 J, 10 J and 20 J). The multi-impact damage evolution was studied by combining several non-destructive techniques such as Pulsed Thermography, Electronic Speckle Pattern Interferometry and Ultrasonic C-scanning. Along with images of detected damaged areas, some impact parameters such as contact force, deflection and absorbed energy were provided.

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The effect of composite materials interfacial discontinuities on the impact safety of future composite rail vehicles

Xue,

Robinson,

Zhang

2024

Engineering Reports

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In contrast to single‐phase materials the manufacturing process of composites creates multiscale interfaces among constituent materials and between laminar multilayers. Targeting the interfaces in these composite structures, this paper presents a perspective study on the impact safety of potential future composite rail vehicles. The aim is to conceptually explore the key role of interfacial discontinuities of composite material structures as they are a critical issue affecting the impact performance of future composite rail vehicles. Following a theoretical description, the issues are addressed in two parts. First, composite materials are characteristically analyzed from the perspective of their interfacial discontinuities within the materials and between the laminate multilayers to identify their influence. Second, the structural conditions required for crashworthiness are determined in relation to the dual requirements of global stability and local deformability for efficient energy absorption. The key findings are: (1) The interfacial discontinuities of the material phases and the designed structural assemblies need to be tailored for crashworthiness performance and (2) Global stability and locally deformability are the key dual requirements for the energy absorbing progressive deformations that are essential for application of composite for crashworthiness of rail vehicles. The research conceptually explores a key issue of the impact mechanics of composite structures from the perspective of impact safety of composite rail vehicles.

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Damage accumulation mechanism of composite laminates subjected to repeated low velocity impacts

Cited by 68 publications

References 44 publications

Changes in dynamic mechanical behavior of carbon fiber reinforced polymer laminates under multiple low energy impacts

Changes in dynamic mechanical behavior of carbon fiber reinforced polymer laminates under multiple low energy impacts

Response of glass/carbon hybrid composites subjected to repeated low velocity impacts

The effect of composite materials interfacial discontinuities on the impact safety of future composite rail vehicles

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