The relation between pre-stress and failure stress in tempered glass

Veer, Fred; Rodichev, Yu. M.

doi:10.1201/b16499-101

Cited by 8 publications

(9 citation statements)

References 2 publications

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“…The far-field stress is assumed homogeneously distributed far from edges/holes. This is not always the case for commercially tempered glass where large variations can be found as reported by e.g Nielsen et al (2010b); Veer and Rodichev (2014). However, the holes considered in this paper are small and only influence the stress state locally and the assumption of a homogeneous residual stress field seems reasonable.…”

Section: Tempered Glassmentioning

confidence: 68%

Investigating the strength effects of drilling in tempered glass

et al. 2019

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Section: Tempered Glassmentioning

confidence: 68%

Investigating the strength effects of drilling in tempered glass

et al. 2019

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“…Hence, if one considers the surface of heat‐treated glass plates produced with oscillations, the residual stress can be assumed to be equibiaxial, at least at a certain distance from the edges that, in general, result to be much more compressed than the core . It is customary to consider that, up to a distance of 15 mm from the edges, the state of stress is equibiaxial and homogenous in practice, thus neglecting, at least as a first‐order approximation, the inevitable point to point variation within a single specimen . Indeed, the major variations in the state of prestress are found from plate to plate.…”

Section: The Modelmentioning

confidence: 98%

“…30 It is customary to consider that, up to a distance of 15 mm from the edges, the state of stress is equibiaxial and homogenous in practice, 32 thus neglecting, at least as a first-order approximation, the inevitable point to point variation within a single specimen. 12 Indeed, the major variations in the state of prestress are found from plate to plate.…”

Section: The Assumed Statistical Distributionsmentioning

confidence: 99%

“…In this illustrative example, the statistical parameters in (5) and (6) are assumed to be m=5.624, g 0 ¼ 751:41 MPa mm 2=m , l=80 MPa, r=7 MPa. The corresponding cumulative probability function for an equibiaxial state of stress acting on a unitary area A=1 m 2 , obtained with (12), is drawn with continuous line in Figure 6. The dash-dotted curve is obtained by considering an uniaxial state of stress.…”

Section: Application To the Experiments By Veer Et Almentioning

confidence: 99%

“…From a statistical point of view, it is common to evaluate the fractiles of the distribution of strengths for prestressed glass by summing up the fractiles corresponding to the distributions of the prestress and of the bending strength of glass before the thermal treating. However, several experimental campaigns have demonstrated that the thermal‐treated glass strength does not correspond to the simple sum of the prestress and of the untreated material strength. Indeed, the final strength may be much higher than this sum.…”

Section: Introductionmentioning

confidence: 99%

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Statistical interference of material strength and surface prestress in heat‐treated glass

Pisano

Royer-Carfagni

2016

J Am Ceram Soc

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It is customary to assume that the characteristic design value for heat‐treated glass is represented by the sum of the characteristic values of the annealed glass strength and of the heat‐induced surface prestress, even though experiments have provided evidence that the resulting strength may be much higher. Here, we investigate the statistical interference between an assumed two‐parameter Weibull distribution for the annealed glass strength and a Gaussian distribution for the surface prestress. We show how the compound distribution confirms the experimental findings and, in particular, that the type of stress induced by the applied loads, ie, uniaxial vs biaxial, has an important role. This effect, which is more relevant for “weak” than for “strong” glasses, is the mechanical counterpart of the well‐known principle of diversification of investments in economy, and leads to a critical consideration of the design approach commonly suggested by structural standards.

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Structural Strength of Heat-Strengthened Glass

et al. 2018

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The paper considers the determining factors in the structural strength of heat-strengthened glass. The values of residual stress were obtained experimentally at different points on the surface of specimens of heat-strengthened, HS-glass and fully tempered, FT-glass using a SCALP-4 laser scanning polarimeter. The distribution of residual stresses is determined over the area of specimens. It is found that the standard methods of in-process control of the degree of strengthening that involve the determination of compressive stresses only at several points, give a fairly rough estimate of the average level of induced residual stresses in glass structural elements and do not determine their real significance near the fracture origins. The necessity of using the methods of more comprehensive in-process control of residual stresses is justified in order to obtain data on their statistical distribution and optimize the heat strengthening modes according to special requirements to building glazing and new engineering products. As shown by the analysis of the investigations dealing with determination of "the strengthening effect" during heat treatment of glass, it does not exceed the level of residual stresses. Due to the statistical nature of glass strength and residual stresses, the determination of the empirical coefficient, which traditionally considers the increasing contribution of residual stresses to the strength value of heat-strengthened glass, presents great difficulties. Based on the sampling of the bending strength values for glass in the initial, as-received state and after heat strengthening using the mathematical statistics methods, the calculated distribution of stress values that characterize the strengthening effect is determined. The influence of the combination of heat strengthening and etching on the strength characteristics of glass is investigated. It is found that the enhancement of the strength of glass and glass products strengthened using combined techniques is accompanied by a significant increase in the scatter of the tensile strength values, and the influence of the combined treatment on the tensile strength of glass is not additive.

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The relation between pre-stress and failure stress in tempered glass

Cited by 8 publications

References 2 publications

Investigating the strength effects of drilling in tempered glass

Investigating the strength effects of drilling in tempered glass

Statistical interference of material strength and surface prestress in heat‐treated glass

Structural Strength of Heat-Strengthened Glass

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