A Four‐Point Bend Technique to Determine Dynamic Fracture Toughness of Ceramics

Weerasooriya, Tusit; Moy, Paul; Casem, Daniel; Cheng, Ming Huei; Chen, Weinong

doi:10.1111/j.1551-2916.2005.00896.x

Cited by 69 publications

(41 citation statements)

References 19 publications

(22 reference statements)

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“…Recently, Owen et al [1998] observed that the SIFs obtained by directly measuring the crack tip opening are consistent with those calculated with the quasistatic equation when the dynamic stress equilibrium of the specimen is roughly achieved in split Hopkinson tension bar testing. This concept was subsequently adopted in [Weerasooriya et al 2006] for ceramics in split Hopkinson pressure bar (SHPB) testing using a dynamic four-point bend method.…”

Section: Introductionmentioning

confidence: 99%

Dynamic fracture tests of polymethylmethacrylate using a semicircular bend technique

Huang

Luo

Tatone

et al. 2011

J. Mech. Mater. Struct.

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We adopt a recently developed technique, dynamic semicircular bend testing, to measure the fracture initiation toughness, fracture propagation toughness, and fracture velocity of polymethylmethacrylate (PMMA). A modified split Hopkinson pressure bar system is used to apply the dynamic load. In this method, both the fracture initiation toughness and fracture energy, and thus the average fracture propagation toughness, are determined. The initiation toughness is found to be similar to the propagation toughness, and both toughnesses are loading rate-dependent. Our initiation toughness values for PMMA are in accord with those reported in the independent literature. The fracture velocity increases and then becomes saturated as the propagation toughness increases. We also measure the fracture surface roughness of the recovered fragments. While the surface roughness increases with the fracture energy, the increase of surface area alone is not sufficient to accommodate the increase in fracture energy, suggesting other energy dissipation mechanisms in the dynamic fracture process besides free surface creation.

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Section: Introductionmentioning

confidence: 99%

Dynamic fracture tests of polymethylmethacrylate using a semicircular bend technique

Huang

Luo

Tatone

et al. 2011

J. Mech. Mater. Struct.

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“…Other researchers, such as Chen et al [9] have solved this problem by embedding quartz based loading devices in the loading train, which allows for direct measurement of dynamic equilibrium and loading rate. Weerasooriya et al developed a high loading rate four-point bend fracture toughness experimental method, and used it to measure the dynamic fracture toughness of SiCN ceramic [10] and PMMA [11]. Gunnarsson et al [12] further developed this technique to measure the fracture toughness of human cortical bone, integrating ultra-high speed imaging and crack tip strain analysis.…”

Section: Introductionmentioning

confidence: 99%

Fracture Response of Cross-Linked Epoxy Resins as a Function of Loading Rate

Whittie

Moy

Gunnarsson

et al. 2012

Dynamic Behavior of Materials, Volume 1

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The failure behavior of cross-linked polymer epoxies were investigated under Mode I fracture at low and high loading rates. By varying the monomer choices, the properties of the epoxies can be tailored to achieve a greater resistance to cracking and high impact toughness. For these experiments, a unique four-point bending specimen was developed. High rate experiments were conducted on a modified Split Hopkinson Pressure Bar (SHPB) with pulse-shaping. High speed digital imaging was used to determine the failure initiation, and allow for use of digital image correlation (DIC) to optically measure the crack opening displacement (COD) and crack propagation velocity. The experimental results are used to obtain the energy required to initiate fracture at various loading rates. The critical energy required to initiate fracture for this epoxy shows limited rate dependence from quasi-static to dynamic loading rates, but becomes rate sensitive when loaded at dynamic rates. The experimental procedures and results are discussed in this paper.

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“…The majority of investigations have attempted to extend existing quasi-static techniques to a dynamic loading situation, hence the proliferation of high rate bending techniques. The bend test can be one-, three-or four-point with the load provided by a modified Hopkinson bar, a drop tower, a high rate servo-hydraulic machine or a Charpy pendulum [18].…”

Section: High Rate Testsmentioning

confidence: 99%

A combined experimental–numerical investigation of fracture of polycrystalline cubic boron nitride

Carolan

Ivanković

2013

Engineering Fracture Mechanics

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Numerical modelling of a series of experimental Single Edge V-Notched Beam tests was carried out for a number of grades of polycrystalline cubic boron nitride using the finite volume method (FV) and cohesive zone model approach.The effect of notch root radius observed experimentally was reproduced numerically via a unique CZM for each material examined. It was also found that the shape of the cohesive zone model can be significant, especially when the material has a relatively high fracture energy. It was also demonstrated that the experimentally observed drop in fracture toughness with increase in test rate was not explainable in terms of the system dynamics. It was found that in order to predict the experimental fracture loads for a range of loading rates, it was necessary to modify the CZM in such a way as to preserve the micro-structural length scale information of the material embedded within the CZM.

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A Four‐Point Bend Technique to Determine Dynamic Fracture Toughness of Ceramics

Cited by 69 publications

References 19 publications

Dynamic fracture tests of polymethylmethacrylate using a semicircular bend technique

Dynamic fracture tests of polymethylmethacrylate using a semicircular bend technique

Fracture Response of Cross-Linked Epoxy Resins as a Function of Loading Rate

A combined experimental–numerical investigation of fracture of polycrystalline cubic boron nitride

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