High-rate mode II fracture toughness testing of polymer matrix composites – A review

May, Michaël; Channammagari, Harichandana; Hahn, Philipp

doi:10.1016/j.compositesa.2020.106019

Cited by 26 publications

(4 citation statements)

References 56 publications

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“…This shows that the adhesive was stronger in both load cases than the CFRP. The fact that the bonded specimens failed in a similar manner at both experimental loading rates tends to highlight a rate-dependent effect in the composite material properties, which has also been repeatedly reported and summarized in review articles [41][42][43]. However, a specific layer in which the delamination failure occurred could not be identified.…”

Section: Assessment Of Rate Effects and Failure Modesmentioning

confidence: 52%

Mechanical Behavior of Multi-Material Single-Lap Joints under High Rates of Loading Using a Split Hopkinson Tension Bar

Rüthnick

Imbert

May

2022

Metals

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In the presented research, a split Hopkinson tension bar (SHTB) was used to measure the mechanical response of multi-material single-lap joints in the high-rate loading regime. High-performance applications require high-quality measurements of the mechanical properties to define safe design rules. Servo-hydraulic machines are commonly used to investigate such small structures, but they are prone to produce oscillation-affected force measurements. To improve force–displacement measurements, an SHTB was chosen to investigate these joints. Three different kinds of joints were tested: multi-material bolted joints, multi-material bonded joints, and multi-material bonded/bolted joints. One substrate of the joints was made of aluminum (Al-2024-T3) and the other one was made of a laminated composite (TC250). A countersunk titanium bolt and a crash-optimized epoxy adhesive (Betamate 1496 V) were used to fasten the joints. A constant impedance mounting device was implemented to limit wave reflections and to improve the signal quality. Quasi-static experiments at a servo-hydraulic machine were performed to compare the data with the respective data from the high-rate loading conditions. The presented research shows that high-quality high-rate tests of multi-material single-lap joints can be achieved by employing an SHTB. With this high-quality measurement, a rate dependency of the mechanical behavior of these joints was identified. The dynamic increase (DI), which is the ratio of a high rate of loading over quasi-static loading, was measured for each of the joint types, where the dynamic increase in the max force was DI = 1.1 for the bolted, DI = 1.4 for the bonded, and DI = 1.6 for the bonded/bolted joints.

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Section: Assessment Of Rate Effects and Failure Modesmentioning

confidence: 52%

Mechanical Behavior of Multi-Material Single-Lap Joints under High Rates of Loading Using a Split Hopkinson Tension Bar

Rüthnick

Imbert

May

2022

Metals

Self Cite

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“…A comprehensive understanding of the laminated composite material’s resistance to interlaminar fracture is essential for product development and material selection. Previous studies on the fracture toughness of composite materials are well-documented in the literature. − …”

Section: Introductionmentioning

confidence: 98%

Glass Fiber–Epoxy Composites with Boron Nitride Nanotubes for Enhancing Interlaminar Properties in Structures

et al. 2022

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Hybrid composite materials are a class of materials where more than one type of reinforcement is integrated into a matrix to achieve superior properties. This typically involves nanoparticle fillers employed within traditional advanced composites with fiber reinforcements such as carbon or glass. The current study builds on previous investigations of boron nitride nanotube (BNNT) hybrid composites, specifically glass fiber (GF)–epoxy/BNNT composite laminates. GF is an effective and affordable primary reinforcement fiber in many applications, and boron nitride nanotubes (BNNTs) exhibit impressive mechanical properties comparable to carbon nanotubes (CNTs) with distinct functional properties, such as electrical insulation, which is desirable in manufacturing insulating composites when combined with GF. GF–epoxy/BNNT composite laminates, incorporating BNNT materials with different loadings (1 and 2 wt %) and purity, were manufactured using a hand layup technique and prepared for three-point bending, modified Charpy, dynamic mechanical analysis (DMA), and fracture toughness (mode I and mode II) measurements. A comprehensive microscopy study was also performed using scanning electron microscopy (SEM) showing prominent failure mechanism, nanotube dispersion, and their mode of reinforcement in different loading scenarios. Enhanced properties, including a 43% increase in mode II fracture toughness, were observed in hybrid composites with 1 wt % BNNT compared to the GF composites with neat epoxy, and the reinforcement mechanisms were discussed.

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“…Experimental studies for the rate effects on mode-II fracture toughness can be found [88] and in a comprehensive review [89], but -just as for the mode-I investigations -there were no unanimous conclusions regarding fracturetoughness rate effects.…”

Section: Introductionmentioning

confidence: 99%

Dynamic interfacial fracture

Chen

Harvey

Wang

et al. 2023

Dynamic Deformation, Damage and Fracture in Composite Materials and Structures

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High-rate mode II fracture toughness testing of polymer matrix composites – A review

Cited by 26 publications

References 56 publications

Mechanical Behavior of Multi-Material Single-Lap Joints under High Rates of Loading Using a Split Hopkinson Tension Bar

Mechanical Behavior of Multi-Material Single-Lap Joints under High Rates of Loading Using a Split Hopkinson Tension Bar

Glass Fiber–Epoxy Composites with Boron Nitride Nanotubes for Enhancing Interlaminar Properties in Structures

Dynamic interfacial fracture

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