Measurement of Biaxial Strength of New vs. Used Windshields

Gulati, Suresh T.; Helfinstine, J. D.; Roe, T. A.; Khaleel, Mohammad A.; Davies, R. W.; Koram, Kwaku; Henry, Vinita Allee

doi:10.4271/2000-01-2721

Cited by 13 publications

(7 citation statements)

References 7 publications

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“…Outside the inner loading ring, there are decreasing radial and hoop tensile stresses out to the support ring. They extend even further out to the disk rim 1–9 . The conventional formulas for the maximum tensile stress in the specimen bottom middle depend upon the loading and support ring diameters, Poisson's ratio, and the specimen diameter and thickness.…”

Section: Introductionmentioning

confidence: 99%

On radial, circumferential, and spiral cracks in fractured glass plates

Quinn

Swab

Patel

2021

Int J of Appl Glass Sci

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This is a fractographic case study of a mechanically loaded glass plate that formed a remarkable spiral crack when the plate fractured. Common radial and circumferential cracking in disks and plates in general are first reviewed. The exceptional spiral crack is then analyzed. The origin of failure was an unusual flaw on the nominal compression side of the plate. The complex spiral fracture pattern has been observed in other large plate glass fractures that break under blunt impact conditions. Spiral cracks can form and propagate from flaws on the front side of a flexed plate that is rigidly supported at its rim or, alternatively, is supported from underneath and has a large overhang.

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Section: Introductionmentioning

confidence: 99%

On radial, circumferential, and spiral cracks in fractured glass plates

Quinn

Swab

Patel

2021

Int J of Appl Glass Sci

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“…The typical fracture origins, shown in Figure 8, occur on the corner of the edges and are generally associated with the chamfering process. The mirror radius R m , measured from these origins, was used to estimate failure stress using the well known equation [3] σ 4PB = A / R m 0.5 (10) in which A is the mirror constant for glass with a value of 65 MPa mm 0.5 . Figure 9 shows a Weibull plot of edge strength of panels, based on mirror radius, with different thicknesses.…”

Section: -Point Bend Testmentioning

confidence: 99%

72.2: Strength Measurements of Thin AMLCD Panels

Westbrook

Bayne

Roe

et al. 2010

Symp Digest of Tech Papers

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“…If the stress profile in the moment of the first complete contact is of lower significance, the CDR can also be used for biaxially curved glass. Gulati et al (2000) examined laminated and curved windshields with respect to their breakage stress, using the coaxial double ring test. Here, the breakage stresses were determined by means of strain gauge rosettes at the centre of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Biaxially curved glass with large radii—determination of strength using the coaxial double ring test

Müller-Braun

Schneider

2017

Glass Struct Eng

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The coaxial double ring test is used for determining the surface strength of flat glass e.g. as it is described in existing standards. The main idea of this test setup is to generate a defined area of surface tensile stress, which is uniform in all directions within the load ring. Thus, the orientation of surface flaws does not influence the test results. Furthermore, the defined area with uniform stress allows a statistical evaluation with regard to the flaw distribution and therefore a prediction for deviating area sizes is possible. For biaxially curved glass, the generation of such an area of uniform tensile stress is not easily possible in a test setup. However, for large radii of curvature and low glass thicknesses it is possible to flatten the specimen during the test and to generate an area of uniform tensile stress with increasing load. This contribution shows under which geometrical conditions the coaxial double ring test can also be used for biaxially curved glass.

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Measurement of Biaxial Strength of New vs. Used Windshields

Cited by 13 publications

References 7 publications

On radial, circumferential, and spiral cracks in fractured glass plates

On radial, circumferential, and spiral cracks in fractured glass plates

72.2: Strength Measurements of Thin AMLCD Panels

Biaxially curved glass with large radii—determination of strength using the coaxial double ring test

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