Verification of ball-on-ring test using finite element analysis

Chae, Seung-Hyun; Zhao, Jiajun; Edwards, D.; Ho, Paul S.

doi:10.1109/itherm.2010.5501307

Cited by 11 publications

(8 citation statements)

References 9 publications

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“…The strength of the discs was determined by using a ballon-ring (BOR) test with a universal testing machine Tinius Olsen H10KS [15][16][17]. Reported strengths represented the mean and standard deviation of at least 10 specimens.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and characterization of ZrO2/Ni composites

et al. 2018

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This paper focuses on a research on the influence of nickel content in zirconia matrix and its impact on the mechanical properties of obtained composites. ZrO 2 /Ni mixed powders were uniaxially pressed and sintered in a nitrogen atmosphere to obtain ZrO 2 /Ni composites that were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive Xray spectroscopy (EDS). The stereological analysis allows obtaining information about the size distribution of zirconia grains in the sintered composites. Relative density, hardness, fracture toughness, and bending strength were also analyzed. The results revealed that the presence of Ni particles in the composites affects the mechanical properties of the materials. An increased Ni concentration caused a decrease in Vickers hardness and increased the fracture toughness of the ZrO 2 /Ni composites compared to the ZrO 2 samples. This kind of composite is of interest for temperature and flow sensors, thermal barrier coatings for gas turbines and supersonic propulsion systems of spacecrafts, as well as as a material for anode in solid oxide fuel cell.

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Section: Methodsmentioning

confidence: 99%

Fabrication and characterization of ZrO2/Ni composites

et al. 2018

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“…(A.40). The effective radius of contact between loading ball and specimen where the loading can be considered uniform is in the general case difficult to determine (Chae et al 2010). The equivalent radius of uniform loading for the present ball-on-ring configuration was determined by comparing the ana-lytical solution for centre-point stress on the bottom of the plate with FE-computations.…”

Section: Discussionmentioning

confidence: 99%

Failure modelling of glass plates in biaxial loading: using flaw-size based weakest-link systems

Kinsella

Serrano

2021

Glass Struct Eng

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Experimental strength tests are performed on two series of nominally equal plate specimens of annealed soda-lime glass subjected to either ring-on-ring or ball-on-ring bending. The Weibull effective area which represents a fictitious surface area exposed to uniform tension is calculated using closed-form solutions. Finite-size weakest-link systems are implemented numerically in a computationally intensive procedure for random sampling of plates extracted from a virtual jumbo pane whose surface area contains a set of stochastic Griffith flaws. A non-linear finite element analysis is conducted to compute the bending stresses. The glass surface condition is represented in different flaw-size concepts that depend on a truncated exponentially decaying flaw-size distribution. Stress corrosion effects are modelled by implementation of subcritical crack growth. The effective ball contacting radius is determined in a numerical computation. The results show that surface size effects in glass are not only a matter of strength-scaling, as also the shape of the distribution changes. While the lowest strength value, as per the major in-plane principal stress at the recorded fracture origin, in the respective data sets is very similar, the strongest specimen observed in ball-on-ring testing is over 70% stronger than the correspondingly strongest specimen observed in ring-on-ring bending. The Shift function is used to make visual comparisons of the difference in quantiles in the observed data sets. Use of an ordinary Weibull distribution leads to non-conservative strength predictions on smaller effective areas, and to too low strength predictions than are viable for glass design on larger areas. The numerical implementation of finite-size weakest-link systems can produce better predictions for the strength-scaling compared to a Weibull distribution, in particular when the flaw-size concept is modified to include a doubly stochastic flaw-size distribution or a random noise added to each subdivided region of the discretized surface area. The simulated ball-on-ring fracture origins exhibit greater spread from the centre point than otherwise observed in laboratory tests. It is indicated that the chosen representation of surface condition may not be accurate enough for the modelling of all fracture origins in the ball-on-ring setup even though acceptable results are obtained with the ring-on-ring model. There is a need for more insight into the surface condition of glass which can be conducive to the development of flaw-size based weakest-link modelling.

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“…The room temperature bi-axial fracture strength of the dense membranes was determined by a ball on ring test [17,18] with a universal mechanical testing machine (Instron 5543). The stress-strain relationship was measured in load control mode until fracture of the specimens, and the stress was calculated using the method described by Chae et al [17] In total 12 specimens of each membrane type was measured.…”

Section: Characterizationmentioning

confidence: 99%

“…The stress-strain relationship was measured in load control mode until fracture of the specimens, and the stress was calculated using the method described by Chae et al [17] In total 12 specimens of each membrane type was measured.…”

Section: Characterizationmentioning

confidence: 99%