Loading rate dependency of Mode I interlaminar fracture toughness for unidirectional composite laminates

Liu, Huifang; Nie, Hailiang; Zhang, Chao; Li, Yulong

doi:10.1016/j.compscitech.2018.07.040

Cited by 57 publications

(28 citation statements)

References 11 publications

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“…The experimental results showed that the intralaminar fracture toughness of the studied composite laminates are very sensitive to the strain rate effects, indicating a linear dependency of the fracture toughness

and strain energy release rate

on the strain rate. Liu et al [ 41 ] utilized a novel dual electromagnetic Hopkinson bar apparatus to test a double cantilever beam specimen of a unidirectional carbon/epoxy laminate T700/MTM with velocities in the range of 10–30 m/s. Considering the time derivative of energy release rate as the strain rate, the Mode-I interlaminar crack initiation fracture toughness of T700/MTM showed a strongly positive rate sensitivity for this system under dynamic loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Review of Strain Rate Effects of Fiber-Reinforced Polymer Composites

Liu

Liu³

et al. 2021

Polymers

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The application of fiber-reinforced polymer (FRP) composites is gaining increasing popularity in impact-resistant devices, automotives, biomedical devices and aircraft structures due to their high strength-to-weight ratios and their potential for impact energy absorption. Impact-induced high loading rates can result in significant changes of mechanical properties (e.g., elastic modulus and strength) before strain softening occurs and failure characteristics inside the strain localization zone (e.g., failure mechanisms and fracture energy) for fiber-reinforced polymer composites. In general, these phenomena are called the strain rate effects. The underlying mechanisms of the observed rate-dependent deformation and failure of composites take place among multiple length and time scales. The contributing mechanisms can be roughly classified as: the viscosity of composite constituents (polymer, fiber and interfaces), the rate-dependency of the fracture mechanisms, the inertia effects, the thermomechanical dissipation and the characteristic fracture time. Numerical models, including the viscosity type of constitutive models, rate-dependent cohesive zone models, enriched equation of motion and thermomechanical numerical models, are useful for a better understanding of these contributing factors of strain rate effects of FRP composites.

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and strain energy release rate

Section: Introductionmentioning

confidence: 99%

Review of Strain Rate Effects of Fiber-Reinforced Polymer Composites

Liu

Liu³

et al. 2021

Polymers

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“…Blackman et al [3] derived the ERR for a steadystate propagating crack based on the same approach. There were also experimental studies [6] and by numerical simulations [7]. Vibration may be one of the reasons why experiments used to measure initiation fracture toughness disagree on loading-rate effects [8].…”

Section: Introductionmentioning

confidence: 99%

Dynamic interfacial fracture of a double cantilever beam

Chen

Harvey

Wang

et al. 2020

Engineering Fracture Mechanics

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Assessment of the energy release rate (ERR) of layered material structures with account for dynamic and vibration effects is important for understanding and predicting fracture behavior in various engineering applications. In this work, the pure-mode-I interfacial fracture behavior of a symmetric double cantilever beam (DCB) under constant-rate opening displacement is studied using a dynamics and vibration analysis of Euler-Bernoulli beams, and the ERR is derived. Furthermore, a 'dynamic factor' that quantifies the dynamic effect in relation to the static component of ERR is defined. The resulting expressions are relatively short, mathematically elegant and convenient-to-use by engineers and researchers, which increases their usefulness. It is found that the dynamic factor is a function of the characteristic time only, and that this is an intrinsic property of DCB structures. An approximate method is also proposed to predict the crack extension. Predictions of ERR and crack extension are in good agreement with results from numerical results with finite-element method (FEM) simulations. Using only the first vibration mode is sufficient to capture the amplitude and frequency of ERR variation predicted by the FEM. Using higher-order vibration modes causes divergence in the amplitude of ERR oscillation; this is due to the limitation of Euler-Bernoulli beams in vibration analysis.

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“…The mode I interlaminar fracture test is also used to compare the composite bonded joints connected by different epoxy adhesives [7,8,9,10]. Currently, tests in mode I are also conducted in significantly different conditions to those resulting from the application of the standards, e.g., by an increased loading rate [11] or even dynamic fracture tests [12] (with the use of dual electromagnetic Hopkinson bar) have been performed.…”

Section: Introductionmentioning

confidence: 99%

Mode I Interlaminar Fracture of Glass/Epoxy Unidirectional Laminates. Part I: Experimental Studies

et al. 2019

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The paper presents experimental tests of unidirectional double cantilever beams made of a glass fiber reinforced (GFRP) laminate. The critical value of the strain energy release rate (c-SERR or GIC), i.e., the mode I fracture toughness of the considered material was determined with three different methods: the compliance calibration method (CC), the modified compliance calibration method (MCC), and the corrected beam theory (CBT). Due to the common difficulties in precise definition of delamination initiation force, the Acoustic Emission (AE) technique was applied as an auxiliary source of data. The failure process was monitored, as well, in order to detect and identify different damage phenomena. This was achieved through a detailed analysis of the raw AE signal subjected to fast Fourier transformation (FFT). The frequency spectra revealed three dominating frequency bands with the basic one described by the average value of 63.1 kHz, revealing intensive delamination processes. This way, not only precise values of the critical SERR, but also the information on damage evolution during propagation of delamination, was obtained.

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Loading rate dependency of Mode I interlaminar fracture toughness for unidirectional composite laminates

Cited by 57 publications

References 11 publications

Review of Strain Rate Effects of Fiber-Reinforced Polymer Composites

Review of Strain Rate Effects of Fiber-Reinforced Polymer Composites

Dynamic interfacial fracture of a double cantilever beam

Mode I Interlaminar Fracture of Glass/Epoxy Unidirectional Laminates. Part I: Experimental Studies

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