Mixed mode dynamic crack-fiber bundle interaction using caustics

Hao, Wenfeng; Sheng, Xixuan; Guo, Genmiao; Chen, Xinwen; Zhu, Jianguo

doi:10.1016/j.polymertesting.2016.09.006

Cited by 7 publications

(5 citation statements)

References 41 publications

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“…Pa ≠1 (Gan, 1964) is the optical stress constant for glass; d = 0.005 m is thickness of the specimen in the transmitted caustic; z 0 = 3.12 m is the distance between the reference plane and the specimen plane; " = 3.17 (Yao et al, 2007;Zhang et al, 2007) is a correction factor that o sets the shape distortion in the caustics; F (V ) ¥ 1 is the typical correction factor used for all practical crack velocities V (Yao et al, 2003;Hao et al, 2016a). The dynamic stress intensity factor of the crack tip at time t is obtained by measuring the transverse diameter of the caustics D(t).…”

Section: Measurement Of the Dynamic Stress Intensity Factormentioning

confidence: 99%

Dynamic crack-interface interactions in SGP laminated glass: An experimental investigation

Yuan

Zhao

et al. 2018

Mechanics of Materials

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The damage mode (crack arrest or bifurcation) that develops in SentryGlas ® Plus (SGP) laminated glass under dynamic impact loading is investigated experimentally in this paper. An optical caustic method is employed-which allows simultaneous measurements of the spatial and temporal evolution of crack paths and the dynamic stress intensity factor at the crack tip(s)-to elucidate the e ects of interface location and impact kinetic energy upon the fracture morphology, crack propagation velocity and the dynamic stress intensity factor in SENB (single-edge notch bend) test specimens loaded in three-point bending by a dropweight impact system. Results reveal that there is a critical distance, between the interface and pre-crack tip, below which the propagating mode-I crack is arrested by the interface; otherwise, bifurcated mixed-mode cracks will always appear in the impacted glass layer. A maximum dynamic stress intensity factor criterion is shown to be capable of predicting whether bifurcated mixed-mode cracks would appear in the aforesaid.

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Section: Measurement Of the Dynamic Stress Intensity Factormentioning

confidence: 99%

Dynamic crack-interface interactions in SGP laminated glass: An experimental investigation

Yuan

Zhao

et al. 2018

Mechanics of Materials

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“…39 Numerous studies have addressed the brittle fracture behavior of interfaces in layered material, including theoretical analysis, numerical simulations, and experimental studies. [40][41][42][43][44] The effect of mismatching elastic moduli of the host materials on the interface cracking, macroscopic deformation, and failure characteristics are the main factors considered in these studies. Micro-fracture parameters of the moving crack in layered materials and the effect of interface strength properties on the interface crack behavior require further study.…”

Section: Introductionmentioning

confidence: 99%

“…The accuracy of the numerical model is verified by the experimental results. Although many papers in the existing literature already addressed this subject with very similar experimental or numerical approaches, 44,45 there are relatively few systematic studies on the influence of the mechanical properties and structural characteristics of the interface on layered materials. In addition, the numerical calculation in this paper not only makes use of the computational advantages of CDEM in crack problems but also introduces the theoretical calculation formula of spring stiffness into the CDEM calculation framework for the first time, which solves the disadvantages of the empirical value of spring stiffness in traditional CDEM and FDEM.…”

Section: Introductionmentioning

confidence: 99%

“…Torabi and Pirhadi proposed a newly concept, called the Virtual Isotropic Material Concept (VIMC), accompanying with two well‐known brittle failure models, to predict the theoretical LPF load under mixed mode I/II loading 39 . Numerous studies have addressed the brittle fracture behavior of interfaces in layered material, including theoretical analysis, numerical simulations, and experimental studies 40–44 . The effect of mismatching elastic moduli of the host materials on the interface cracking, macroscopic deformation, and failure characteristics are the main factors considered in these studies.…”

Section: Introductionmentioning

confidence: 99%

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Experiments and numerical simulations on dynamic crack behavior at the interface of layered brittle material

Zhou

Yue

Feng

et al. 2022

Fatigue Fract Eng Mat Struct

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Crack behavior at the interface between two materials is the core problem of layered material fracturing. In this paper, first, experimental tests were conducted on layered material using a drop weight test system following the caustics method. The layered material was made of poly (methyl methacrylate) (PMMA) and epoxy resin bonded with Loctite-330 at two inclination angles (30 and 60 ). A corresponding numerical simulation was carried out using continuum-discontinuum element methods. Crack propagation is found to mainly occur in mode I in the PMMA and epoxy resin but follows a mixed cracking mode at the interface. The fracture parameters of the crack tip in the layered materials changed substantially owing to the existence and change of the interface structure. After the crack enters the interface, the crack propagation speed increases significantly. Higher crack dip angles are associated with greater crack propagation speed increases after entering the interface. The simulation results indicate that the interface strength properties affect crack behavior at the interface. This effect also varies as a function of interface inclination and impact velocity.

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“…As the compression deformation increased, the material fracture toughness was enhanced, and the brittle-toughness transition occurred. Wenfeng Hao et al [14] conducted a dynamic caustics test using fibre bundles of different thicknesses and showed that the fibre bundle shielded the stress intensity factor and crack propagation speed at the crack tip. As the fibre bundle thickness increased, the shielding effect gradually increased.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Caustics of Moving Cracks and Elliptical Curvature under Impact Loading

Luo

Yang

Wang

et al. 2021

Advances in Civil Engineering

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A dynamic caustics test system was used, and different moving cracks were analysed to study the interaction between the crack growth rate, stress intensity factor, and curvature of the elliptical end of a moving crack under impact loading. Based on the linear elastic fracture mechanics theory, linearly fitting of the crack tip stress intensity factor and the elliptical curvature were employed to obtain the specific functional expressions. ABAQUS software was used to numerically simulate the moving crack fracture process passing through different elliptical curvatures. The crack tip stress intensity factor was calculated by the stress extrapolation method. The stress intensity factor obtained from the numerical calculation and the caustics test was consistent. The test and numerical simulation results showed that the direction of moving cracks entering and passing through the elliptical defects shows a certain regularity. As the ellipse curvature increased, the moving crack stress intensity factor passing through the ellipse gradually decreased, and the moving crack also passed easily through oval defects.

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Mixed mode dynamic crack-fiber bundle interaction using caustics

Cited by 7 publications

References 41 publications

Dynamic crack-interface interactions in SGP laminated glass: An experimental investigation

Dynamic crack-interface interactions in SGP laminated glass: An experimental investigation

Experiments and numerical simulations on dynamic crack behavior at the interface of layered brittle material

Experimental Study on the Caustics of Moving Cracks and Elliptical Curvature under Impact Loading

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