Effects of inter-ply angles on the failure mechanisms in bioinspired helicoidal laminates

Liu, J.L.; Lee, H.P.; Tan, V.B.C.

doi:10.1016/j.compscitech.2018.07.017

Cited by 68 publications

(24 citation statements)

References 15 publications

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“…Several potential parameters are investigated, namely, fiber properties, the fracture toughness of the laminate, and ply thickness. Since the ply thickness of the laminates reported by Mencattelli and Pinho [9], Liu et al [13], and Grunenfelder et al [10] are 0.024 mm, 0.08 mm, and 0.135 mm, respectively, and the respective optimal inter-ply angle increased from 2.5 deg to 25.7 deg, the ply thickness could be an important parameter.…”

Section: Introductionmentioning

confidence: 88%

“…The specimens are subjected to transverse (out-of-plane) point loads using the experimental setup following procedures described previously by Shang et al [7] and Liu et al [8,13] as shown in Fig. 1(b).…”

Section: Methodsmentioning

confidence: 99%

“…Fiber damage/delamination is dominant in helicoidal laminates with large inter-ply angles (20 deg), while spiraling matrix split is dominant in helicoidal laminates with small inter-ply angles (2.5 deg); too small an inter-ply angle resists delamination but promotes the spiraling matrix split and too large an inter-ply angle resists spiraling matrix split but promotes delamination and fiber breakage; the laminate degrades quickly when either of the damage becomes dominant. Liu et al [13] further concluded that the optimal inter-ply angle was between 5 deg and 10 deg. However, the optimal inter-ply angle was 2.5 deg as reported by Mencattelli and Pinho [9] while 25.7 deg by Grunenfelder et al [10].…”

Section: Introductionmentioning

confidence: 98%

“…While many researchers focus on improving the mechanical performance of laminates through the development of new materials and additives, manipulating the failure mechanism through the structural design of existing laminates could also significantly improve their mechanical performance [1][2][3]. Inspired by the exoskeletal structure of crustaceans by Bouligand [4], several researchers have conducted studies by mimicking the bio-inspired helicoidal structure using carbon fiber laminates [5][6][7][8][9][10][11][12][13][14][15]. Apichattrabrut and Ravi-Chandar [5] were among the first to conduct study on the mechanical performance of the helicoidal laminate using carbon-epoxy laminate.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, two different damage patterns were reported separately-fiber damage/delamination [7,8] and spiraling matrix split [9,10,16]. The recent work by Liu et al [13] covered a wider range of carbon-epoxy helicoidal laminates with inter-ply angles reduced systematically from 40 deg to 2.5 deg. It was reported that under transverse loading, both fiber damage/delamination and spiraling matrix split damage exist in the helicoidal laminate.…”

Section: Introductionmentioning

confidence: 99%

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Bio-Inspired Laminates of Different Material Systems

Liu

Lee

Lai

et al. 2019

Journal of Applied Mechanics

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Helicoidal laminates mimicking the laminar structure of the exoskeleton of crustaceans have been reported to resist higher out-of-plane loads than the common cross-ply and quasi-isotropic fiber-reinforced laminates. Some have reported that smaller inter-ply angle improves strength of helicoidal laminates but others have reported the opposite. A few important material parameters that dictate the failure mechanism of helicoidal laminates have recently been proposed based on proof-of-concept carbon fiber-reinforced laminates, which is not the best material system to benefit from a helicoidal configuration. This study investigates the out-of-plane loading performance of helicoidal laminates with various inter-ply angles, ply thicknesses, and materials. Result shows that the failure mechanism is dictated by the competition between spiraling matrix split and delamination followed by fiber breakage regardless of the laminate material system. Spiraling matrix split resistance decreases as pitch (ratio of inter-ply angle to ply thickness) and matrix toughness decreases. This study provides guidelines for the optimization of helicoidal laminates. Coexistence of spiraling matrix split and fiber damage is often seen on the failed laminate with the highest peak load. The optimal inter-ply angle provides the optimal spiraling matrix split resistance; so, neither spiraling matrix split nor fiber/delamination damage becomes dominant. Since resistance to spiraling matrix split decreases as pitch or matrix toughness decreases, the optimal inter-ply angle will increase for laminates with weaker matrix or thicker plies and vice versa.

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Section: Introductionmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bio-Inspired Laminates of Different Material Systems

Liu

Lee

Lai

et al. 2019

Journal of Applied Mechanics

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An analytical study on low velocity impact resistance behaviors of general bio‐inspired helicoidal composite plates

Rao,

Xiong,

Yao

et al. 2024

Polymer Composites

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Through evolutionary processes, helicoidal structures have been proven to exhibit exceptional load‐carrying capacity and impact resistance performance. To date, extensive experimental and numerical studies have been carried out on their impact behaviors, while few relevant analytical studies have been reported even though it is urgently needed for the preliminary assessment of structure design and optimization. In this work, based on the first shear deformation theory (FSDT) and the improved linearized Hertzian contact method, an analytical model for low velocity impact (LVI) performances of helicoidal laminates with arbitrary layups is developed. Therein, the post‐impact damage is taken into account according to continuum damage mechanics (CDM). Comparisons of load‐carrying capacity and energy‐absorbed performance between the proposed model prediction and the existing experimental data\numerical results have been made for verification. Besides, LVI behaviors of conventional laminates with unidirectional distribution andcross‐ply arrangement are discussed. Moreover, the role of rotation angle, impact velocity and the plate dimension on helicoidal laminates' LVI performances are analyzed quantitatively. There is evidence that helical layouts are better able to absorb energy and delay the in‐plane damage.Highlights The LVI responses of bio‐inspired single‐helicoidal (SH) and double‐helicoidal (DH) composite laminate are studied. An effective model to predict the LVI responses considered the post‐impact damage is developed. A comparison of the LVI performance of single‐helicoidal structures with various lay‐up schemes is carried out. DH structure has better low velocity impact resistance than SH structure when the rotation angle shares the same.

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Three‐point bending, interlaminar shear, and impact strength in bioinspired helicoidal basalt fiber/epoxy composites: A comparative experimental analysis

Rai,

Rawat

2024

Polymer Composites

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This study investigates the mechanical characteristics of basalt fiber/epoxy polymer composites (BPC) inspired by nature's higher‐order designs especially helicoidal structures found in fish scales. The present work includes the experimental analysis of 20‐layered bioinspired BPC composites in single helicoidal ([90/80/70/60/50/40/30/20/10/0]s), and double helicoidal ([130/40/120/30/110/20/100/10/90/0]s) layups. The hand layup technique, followed by the vacuum bagging method, is used to fabricate composite laminates. The layup design significantly influenced the mechanical properties of both helicoidal structures with different stacking sequences, including load capacity, deformation, energy absorption, and fracture modes. Interestingly, failure mechanisms demonstrated both bending and twisting (attributed to specific ply orientation, resulting in a twisting effect) occurring majorly under flexural loading, leading to improved energy absorption. The flexural strength of single helicoidal laminate was observed to be 28.8% higher than double helicoidal laminate design. On the other hand, the double helicoidal laminate showed 46.8% and 19.4% higher interlaminar shear strength (ILSS) and impact resistance properties, respectively, compared to the single helicoidal laminate design. Therefore, this comparative experimental analysis of both stacking structures provides insights into potential changes in conventional stacking sequences and enhances understanding of mechanical responses in bioinspired composites.Highlights Mechanical characterization of bioinspired helicoidal laminates is done. The flexural strength of single helicoidal laminates is 28.8% higher than double helicoidal laminates. Double helicoidal laminates showed better interlaminar shear strength and energy absorption.

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Effects of inter-ply angles on the failure mechanisms in bioinspired helicoidal laminates

Cited by 68 publications

References 15 publications

Bio-Inspired Laminates of Different Material Systems

Bio-Inspired Laminates of Different Material Systems

An analytical study on low velocity impact resistance behaviors of general bio‐inspired helicoidal composite plates

Three‐point bending, interlaminar shear, and impact strength in bioinspired helicoidal basalt fiber/epoxy composites: A comparative experimental analysis

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