Test Method for Fracture Strength in Cleavage of Adhesives in Bonded Joints

1998 ◽  
Author(s):  
Keyword(s):  
Fracture Strength ◽  
Test Method ◽  
Bonded Joints

Fracture strength prediction of float glass: The Coaxial Double Ring test method

2019 ◽  
Vol 225 ◽  
pp. 1064-1076 ◽  
Author(s):  
Giulio Castori ◽  
Emanuela Speranzini
Keyword(s):  
Fracture Strength ◽  
Float Glass ◽  
Test Method ◽  
Ring Test ◽  
Strength Prediction ◽  
Double Ring

Parameters on Fracture Strength of Sea Ice

1983 ◽  
Vol 105 (1) ◽  
pp. 12-16 ◽  
Author(s):  
N. Urabe ◽  
A. Yoshitake ◽  
T. Iwasaki ◽  
M. Kawahara
Keyword(s):  
Fracture Toughness ◽  
Sea Ice ◽  
Strain Rate ◽  
Fracture Strength ◽  
Test Procedure ◽  
Standard Test ◽  
Test Method ◽  
Beam Specimen ◽  
Crushing Strength ◽  
Brackish Ice

Compressive crushing strength on brackish ice and sea ice and fracture toughness value on sea ice were measured as parameters associated with fracture strength of ice. The compressive crushing strength depends on salinity, temperature and strain rate. At constant salinity and temperature, the strength increased with increase in strain rate and reached maximum value at about a strain rate of 10−3 s−1, then decreased with increase in strain rate. An empirical equation to estimate the compressive crushing strength was derived as a function of brine volume, temperature and strain rate. As far as fracture toughness is concerned, a simplified test procedure on notched cantilever beam specimen was developed in order to avoid complicated manipulation in field conditions. The fracture toughness value (KIC) coincided well with the value obtained from fracture toughness tests conducted in conformity with the standard test method.

Effect of Ion-Exchange Chemistry on the Fracture of Chemically Strengthened Sodium Aluminosilicate Glass

2019 ◽  
Author(s):  
Benedict O. Egboiyi ◽  
Trisha Sain
Keyword(s):  
Residual Stress ◽  
Ion Exchange ◽  
Fracture Strength ◽  
Critical Stress Intensity Factor ◽  
Consumer Electronics ◽  
Test Method ◽  
Aluminosilicate Glass ◽  
Ring Test ◽  
Stress Profile ◽  
Sodium Aluminosilicate

Abstract The widespread use of sodium aluminosilicate glass in many critical applications due to its hardness, weight, density and optical properties (transparency, dielectric etc.), instead of metals or plastics has become common in recent years. However, glass which is known to be a brittle material has its own vulnerability to fracture. Processes such as heat treatment (heat tempering) or chemical strengthening, through ion-exchange have been deployed to create residual stress profile on the glass, in a bid to improve its strength for applications such as in the automobile windshield design, consumer electronics mobile communication devices e.g. smartphones and tablet etc. However, failure still occurs which is mostly catastrophic and expensive to repair. Therefore, understanding, predicting and eventually improving the resistance to damage or fracture of chemically strengthened glass is significant to designing new glasses that would be tougher, while retaining their transparency. The relationship between the glass residual stress parameters, compressive stress (CS), depth of layer (DOL), center tension (CT) and fracture strength was investigated in this study using a grit particle blast plus ring on ring test method, based on IEC standard for retained biaxial flexural strength measurements. This technique can be used to measure both the surface and edge fracture strength of the glass. Preliminary results showed that for a reasonable level of CS, and CT, high DOL are beneficial to resisting fracture due to severe surface damage, while a high CS and low CT are beneficial to resisting fractures due to shallower flaws. The correlation of critical stress intensity factor versus DOL and CT for various level of CS were also determined and discussed. These results provide a valuable piece of information in the design of a more robust glass in engineering applications.

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