On the Determination of the Crack Arrest- Toughness

Kalthoff, J. F.; Beinert, J.; Winkler, S.; Blauel, J.G.

doi:10.1016/b978-0-08-022144-1.50041-9

Cited by 9 publications

(6 citation statements)

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“…13 A common problem when testing DCB specimens made of composites is the absence of symmetry 14 while opening under impact, therefore, the wedge loaded setup is an option to avoid such problem. [15][16][17] Numerical analyses of composite plates under an impact load were performed by several authors [18][19][20] with good agreement with the experimental results. The use of cohesive elements to simulate the behaviour of composite materials has been studied, [21][22][23][24] allowing to conclude that such integration is able to correctly assess the G IC behaviour.…”

Section: Introductionmentioning

confidence: 97%

Numerical study of mode I fracture toughness of carbon-fibre-reinforced plastic under an impact load

Machado

Nunes

Marques

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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The main objective of this work is, by using cohesive zone modelling, to compute the fracture toughness behaviour in mode I of unidirectional carbon-fibre-reinforced plastic subjected to an impact load at 4.7 m/s. To perform this task, double-cantilever beam specimens were simulated, with its opening displacement and crack propagation being assessed, as well as the evolution of strain rate through the test. Therefore, by plotting the crack propagation, it was possible to calculate the fracture toughness in mode I ( GIC). A comparison of the numerical results with experimental tests previously performed by using a drop weight falling-wedge impact test equipment was made, allowing to infer that the numerical approach, based on a triangular cohesive zone modelling, is capable to predict the behaviour of such specimens under impact, accurately obtain GIC, and to determine the value of strain rate achieved through the test.

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Section: Introductionmentioning

confidence: 97%

Numerical study of mode I fracture toughness of carbon-fibre-reinforced plastic under an impact load

Machado

Nunes

Marques

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…In these studies, the quasi‐static crack‐tip fields were used to analyze the dynamic shadow patterns without considering inertial effects. But as the crack velocity becomes a substantial fraction of the Rayleigh wave speed, the inertial effects significantly modify the crack tip stress fields.Subsequently, Kalthoff et al 12 . introduced an approximate correction factor to account for dynamic effects.…”

Section: Introductionmentioning

confidence: 99%

“…11 In these studies, the quasi-static crack-tip fields were used to analyze the dynamic shadow patterns without considering inertial effects. But as the crack velocity becomes a substantial fraction of the Rayleigh wave speed, the inertial effects significantly modify the crack tip stress fields.Subsequently, Kalthoff et al 12 introduced an ap-Correspondence: X. F. Yao, E-mail: yxf@mail.tsinghua.edu.cn proximate correction factor to account for dynamic effects. Furthermore, the theory of caustics was developed for elastodynamically propagating cracks with in-plane mixed-mode conditions by Nishioka and Kittaka 13 .…”

Section: Introductionmentioning

confidence: 99%

Recent application of caustics on experimental dynamic fracture studies

Yao

Wang

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T Combining the caustic method with high-speed photography is an efficient optical measurement technique to study the dynamic fracture behaviours of homogenous and isotropic material. In the last decade, the main emphasis is extended to study dynamic fracture of anisotropic material and dynamic propagation of multi-cracks and interface cracks in practical engineering materials. In this paper, the recent advances and applications about the dynamic caustic method in China are reviewed, such as impact response and dynamic fracture of composite materials (fibre composites, functionally gradient materials and nanometre composites), and dynamic interaction and propagation of multicracks and interface cracks. Particularly, some new numerical methods were developed to solve the complicated caustic equations by introducing both the maximum characteristic size and the relevant angles in caustic patterns. Also, some important experimental results in fracture mechanics are described, and the potential research prospects about dynamic caustics are included as well.

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“…The double cantilever beam (DCB) specimen has been used as a model to analyze crack propagation in solids [1-9] and to experimentally study dynamic fracture of metals [10][11][12][13][14][15]. In the majority of the experimental work the crack is intensionally blunted before the fracture starts to store a relatively large amount of energy in the sample.…”

Section: Introductionmentioning

confidence: 99%

“…IntroductionThe double cantilever beam (DCB) specimen has been used as a model to analyze crack propagation in solids [1-9] and to experimentally study dynamic fracture of metals [10][11][12][13][14][15]. The product of the shear force and the square root of the loading time for a specimen constrained to constant displacementrate opening is uniquely related to the critical bending moment at the crack tip during crack propagation.…”

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confidence: 99%

Rapidly wedged crack propagation data with a static compliance calibration

Chow

Burns

1979

Int J Fract

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The dynamic critical stress intensity factor of a propagating crack was measured from the time-dependent shear force at the loading end of a rapidly wedged double cantilever beam specimen. The product of the shear force and the square root of the loading time for a specimen constrained to constant displacementrate opening is uniquely related to the critical bending moment at the crack tip during crack propagation. Static compliance measurements on side-grooved DCB specimens were incorporated into a dynamic Bernoulli-Euler beam, crack propagation model by a crack length shift at a fixed compliance value. This shift does not affect the magnitude of the critical bending moment at the crack tip, predicted by the simple beam model, when the load and the load point displacement are the measured variables. Details of analysis of the time varying shear force are given including: the rigidity of the contact between the wedge and the specimen; the dynamic critical stress intensity values versus crack velocity for Ti-6A1-4V and AISI 1018 cold-rolled steel. I. IntroductionThe double cantilever beam (DCB) specimen has been used as a model to analyze crack propagation in solids [1-9] and to experimentally study dynamic fracture of metals [10][11][12][13][14][15]. In the majority of the experimental work the crack is intensionally blunted before the fracture starts to store a relatively large amount of energy in the sample. The stored energy is converted into kinetic and fracture surface energy during the dynamic fracture event. In the rapidly wedged DCB specimen, which is used in this investigation, energy is continuously supplied to the test specimen by the loading force and the initial starting crack is relatively sharp.Recently, solutions for beam analysis with inertia terms in the equation of crack motion are available both analytically [5, 6] and numerically [7,9]. The dynamic analysis of the beam is used to relate measurable quantities before, during or after the crack propagation event to the specific fracture surface energy of the solid, R, during crack propagation. In the beam analyses, the dynamic strain energy release rate, ~D at the crack tip end of the beam equals R = AK~D/E (1 -v:) with KID the dynamic stress intensity factor during crack propagation, E Young's modulus, v Poisson's ratio and A a function that approaches 1 for crack speeds much less than the speed of elastic waves. In this paper, A will set equal to 1.The fracture criterion of the rapidly wedged DCB dynamic analysis [6] is that a critical bending moment, M*, at the crack tip of the beam propagates the crack. M*,

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On the Determination of the Crack Arrest- Toughness

Cited by 9 publications

References 1 publication

Numerical study of mode I fracture toughness of carbon-fibre-reinforced plastic under an impact load

Numerical study of mode I fracture toughness of carbon-fibre-reinforced plastic under an impact load

Recent application of caustics on experimental dynamic fracture studies

Rapidly wedged crack propagation data with a static compliance calibration

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