Strength of glass

The strength of glass under constant loading also increases with decrease in temperature. Since failure occurs at a lower stress when the glass surface contains surface defects, the strength can be improved by tempering the surface. 

Figure 29.4. Influence of resin content on the flexural strength of glass-cloth laminates made with two silicone resins A and B. (After Gale " )...

Figure 3-60 Compressive Strength of Glass-Epoxy Composite Materials (After Dow and Rosen [3-28])...

Increase in concentration of the polyacid increases solution viscosity, quite sharply above 45% by mass (Crisp, Lewis Wilson, 1977). The strength of glass polyalkenoate cements also increases, almost linearly, with polyacid concentration. This is achieved at the cost of produdng overthick cement pastes and loss of working time. 

Pearson, G. J. Atkinson, A. S. (1991). Long-term flexural strength of glass-ionomer cements. Biomaterials, 12, 658-60. 

Williams, J. Billington, R. W. (1989). Increase in compressive strength of glass-ionomer cements with respect to time a guide to their use in the posterior deciduous dentition. Jourruil of Oral Rehabilitation, 16,... 

Thus, if the maximum safe tension is 1000 Ib/in. (see p. 10), a Caiius tube with 3-mm wall thickness and 2-cm external diameter is suitable for reactions at 340 Ib/in. . It is necessary to remember, of course, that the strength of glass imder tension is a statistical quantity. 

Figure 2.2. Compressive strength of glass spheres as a function of their diameter...

Note in both cases that the specific tensile strength of glass fibres is very much higher than the specific tensile strength of the matrix. The ratio is 4.8 for dry samples and 3.5 at 50% RH. 

Cheng, T.H., Jones, F.R. and Wang, D. (1993). Effect of fiber conditioning on the intcrfacial shear strength of glass-fiber composites. Composites Sci. Technoi. 48, 89 96. 

Koenig, J.L., Emadipour, H. (1985). Mechanical characterization of the interfacial strength of glass reinforced composites. Polym. Composites 6, 142 150. 

When determined relatively soon after placement, reported shear bond strengths of glass-ionomers are of the order of 3-7 MPa [213,220], However, because the material fails cohesively, this is actually a measure of the tensile strength. As the cement matures, the tensile strength increases, and failure rates in clinical service are very low [221],... 

W. B. Hillig, Proceedings of Symposium on the Strength of Glasses and the Means to Improve It, Union Scientifique Continentale du Verre, Chaderoix, Belgium, 1962, p. 206. 

Effect of surface treatment on the tensile strength of glass beads-polyester composites... 

Figure 9. Effect of coupling agents on flexural strengths of glass cloth-reinforced Ihermoseiting resins, dry and wet after 24 h boil.

The effect of storage of 100% RH at 21°C on the bond strength of glass/ aluminium sandwich butt tensile joints, with and without silane, is shown in Fig. 5. It can be seen that without silane the bond strength effectively fell to zero in 150 days. With MPS on the surface, the bond strength equilibriated at 24 MPa at 220 days. 

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