Journal ArticleDOI
Characteristic strength, Weibull modulus, and failure probability of fused silica glass
TLDR
In this article, a Weibull statistical analysis of the UDRI data was performed to evaluate the cumulative failure probability and the failure probability density of polished and superpolished fused SiO2 windows as a function of biaxial tensile stress, for stressed areas ranging from 0.3 to 100 cm2.Abstract:
The development of high-energy lasers has focused attention on the requirement to assess the mechanical strength of optical components made of fused silica or fused quartz (SiO2). The strength of this material is known to be highly dependent on the stressed area and the surface finish, but has not yet been properly characterized in the published literature. Recently, Detrio and collaborators at the University of Dayton Research Institute (UDRI) performed extensive ring-on-ring flexural strength measurements on fused SiO2 specimens ranging in size from 1 to 9 in. in diameter and of widely differing surface qualities. We report on a Weibull statistical analysis of the UDRI data-an analysis based on the procedure outlined in Proc. SPIE 4375, 241 (2001). We demonstrate that (1) a two-parameter Weibull model, including the area-scaling principle, applies; (2) the shape parameter (m10) is essentially independent of the stressed area as well as the surface finish; and (3) the characteristic strength (1-cm2 uniformly stressed area) obeys a linear law, C (in megapascals) 160−2.83× (in parts per million per steradian), where characterizes the surface/subsurface "damage" of an appropriate set of test specimens. In this light, we evaluate the cumulative failure probability and the failure probability density of polished and superpolished fused SiO2 windows as a function of the biaxial tensile stress, for stressed areas ranging from 0.3 to 100 cm2.read more
Citations
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Effect of ZnO nanowire morphology on the interfacial strength of nanowire coated carbon fibers
TL;DR: In this paper, the authors developed the parameters for the growth of nanowires with varying lengths and diameters and studied the influence of the nanowire's morphology on the interfacial shear strength.
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Load-bearing capacity and the recommended thickness of dental monolithic zirconia single crowns.
TL;DR: Monolithic zirconia crowns exhibit higher fracture loads than monolithic lithium disilicate crowns, layered zir Conica crowns and metal ceramic crowns; and the fracture resistance of monolithicZirconian crowns with a thickness of 1.0mm can be equal to metal ceramic Crowns.
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Carboxyl functionalization of carbon fibers through a grafting reaction that preserves fiber tensile strength
TL;DR: In this article, the surface of carbon fibers is functionalized by a reaction of naturally existing surface hydroxyl groups with isopropylidene malonate to graft terminal malonic esters, effectively creating a carboxyl functionalized surface.
Journal ArticleDOI
Improving the interfacial and mechanical properties of short glass fiber/epoxy composites by coating the glass fibers with cellulose nanocrystals
TL;DR: In this paper, the role of cellulose nanocrystals (CNC) on the tensile, flexural, and thermo-mechanical properties of CNC-coated glass fiber/epoxy composites was investigated.
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Influence of silicon carbide as a mineralizer on mechanical and thermal properties of silica-based ceramic cores
TL;DR: In this article, a silica-based core with silicon carbide as a mineralizer for improving the mechanical and thermal properties of the core has been demonstrated and the results suggest that using the optimal amount of SiC in the core can provide excellent mechanical properties of flexural strength and linear shrinkage.
References
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TL;DR: The Heat of the Night and the Dust of the Battlefield Optical Properties of Infrared Windows Optical Performance of IR Windows Mechanical Properties Thermal Properties Fabrication of IR Materials Optical Coatings Erosion and Erosions Protection Proof Testing Diamond - Materials for the Future Appendices as mentioned in this paper.