Experimental investigation of the double impact position effect on the mechanical behavior of low-velocity impact in CFRP laminates

Zhou, Jianwu; Liao, Binbin; Shi, Yaoyao; Ning, Liqun; Zuo, Yangjie; Jia, Liyong

doi:10.1016/j.compositesb.2020.108020

Cited by 37 publications

(16 citation statements)

References 32 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: Resultssupporting

confidence: 75%

“…In the initial phase of contact, the impact force increased linearly to a characteristic value where the stiffness changed due to Hertzian failure. 36,37,31 After that, some oscillations indicated the elastic vibration induced by the initial contact between impactor and laminates. The impact force kept rising until it reached the delamination threshold load (DTL).…”

Section: Resultsmentioning

confidence: 99%

“…The reason for this phenomenon may be that the lower impact energy does not cause the serious damages inside the plate, such as fiber breakage and penetration due to a high impact energy level (20 or 30 J) reported in Ref. 31, which would definitely reduce the stiffness of the plate greatly. After the maximum point, the elastic energy stored in the plate drove the impactor to rebound.…”

Section: Absorbed Energy-time Responsementioning

confidence: 95%

“…In the paper, 30 the symmetric laminate with dissimilar interfaces was proved to have the great endurance against repeated impact. Another interesting study was performed by Zhou et al 31 who impacted the specimens at two different positions. The results indicated that the correlation of two impacts was closely affected by the impact distance, where the larger distance led to the higher coincidence of the mechanical responses.…”

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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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: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Absorbed Energy-time Responsementioning

confidence: 95%

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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“…ere is very little research addressing the impact force caused by wheel bounce and even less on the response and damage of the track slab under the impact force. e impact-induced damage is more concerned in the field of aerospace composite materials [10][11][12][13] and explosion mechanics [14,15]. In the existing studies of the impactinduced damage, the damage is usually evaluated from the energy point of view, by studying the mutual transmission of potential and kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact

Liu

Sun

et al. 2021

Shock and Vibration

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During the running of a high-speed train, the wheel may bounce on the rail due to the track irregularity. The wheel bounce could generate a vertical impact, leading to the initiation and expansion of delamination between layers of the track structure. In this paper, the evolution of the interfacial damage and delamination subjected to the vertical impact is simulated using finite element analysis (FEA). In the FEA, a bilinear cohesive zone model (CZM) is adopted to simulate the interface between the track slab and the CA mortar layer. For different levels of impact energy, the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination are calculated and compared. The effects of the tangential and normal stiffness of the interface on the distribution of interfacial damage and delamination are investigated. The results show that the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination increase with the increase of the impact energy. The area of interfacial damage in the compression stage is closely related to the tangential stiffness, whereas the area of delamination depends on the normal stiffness. The normal stiffness that gives the largest area of delamination is recommended to be taken as the lower bound of the normal stiffness for both controlling the delamination and preventing an exceedance of the track irregularity limit.

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Effect of stacking sequence on multi‐point low‐velocity impact and compression after impact damage mechanisms of UHMWPE composites

Zhang

Dai

et al. 2021

Polymer Composites

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Composite materials are susceptible to low velocity impact, which is a very common phenomenon. A large number of studies have been conducted on the single-point impact on their mechanical properties, but there is a lack of indepth exploration on the actual situation of multi-point impact with a certain angle distribution of impact points. In this paper, three impact points with a certain angle distribution were set to carry out low-velocity impact (LVI) sequentially, followed by compression after impact (CAI). Digital image correlation system (DIC) and X-ray micro-computed tomography techniques (micro-CT) were used to analyze the mechanical response and failure mechanisms of the specimens. Experimental results demonstrated that the distribution of impact points will directly affect the overall mechanical properties of the material, and the mechanical properties are also sensitive to the stacking sequence. More importantly, it was also found that the boundary conditions have a great influence on the overall mechanical response, which makes the surrounding damage worse.

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Experimental investigation of the double impact position effect on the mechanical behavior of low-velocity impact in CFRP laminates

Cited by 37 publications

References 32 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

Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact

Effect of stacking sequence on multi‐point low‐velocity impact and compression after impact damage mechanisms of UHMWPE composites

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