Dynamic Fatigue of Glass

Charles, R. J.

doi:10.1063/1.1723019

Cited by 240 publications

(102 citation statements)

References 2 publications

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“…The glasses with high water content showed a s t r o n g s t r e s s r a t e dependency of the f r a c t u r e s t r e n g t h , even though t h e s t r e n g t h was measured i n p a r a f f i n o i l . The dependency increased with increasing water cont e n t ; t h e value of n [ 8 ] , which was c a l c u l a t e d from t h e slope of t h e l i n e s i n Fig. 1, decreased with increasing water content.…”

mentioning

confidence: 91%

Dynamic Fatigue of Sodium-Silicate Glasses With High Water Content

Ito

Tomazawa

1982

J. Phys. Colloques

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Résumé.-On étudie la manière dont dépend la résistance mécanique de la vitesse d'application des contraintes pour un verre de silicate de sodium ayant un contenu en eau élevé (jusqu'à 25% en poids) . Les verres ont été préparés par séchage de la solution commerciale de silicate de sodium dans un four ou dans un autoclave. La résistance mécanique a été mesurée par une méthode de flexion en quatre points pour des vitesses d'application des charges différentes. Ces verres ont montré une forte dépendance de la vitesse, même dans l'huile de paraffine sèche ; elle augmente avec la teneur en eau. La valeur de n, mesure de cette dépendance est approximativement 5 pour les verres avec ^ 25% en poids d'eau. Parallèlement, le module d'Young décroit. On suggère que cette dépendance accrue résulte du mouvement d'eau sous l'action des contraintes appliquées. De plus, la valeur apparente du module d'Young décroit avec la vitesse de charge. Ce phénomène est expliqué par les propriétés visco-élas-tiques des verres.Abstract.-The stress-rate dependency of the mechanical strength of sodium silicate glass with high water content (up to ^25% by weight) was investigated. The glasses were prepared by drying commercial sodium silicate solution in an oven or an autoclave. The mechanical strength of the glasses was measured by a four point bending method at various stress rates. These glasses showed a strong stress rate dependency even in dired paraffin oil and the dependency increased with increasing water content; the value of n, a measure of the stress rate dependency, was approximately 5 for glasses with ^25 wt% water. At the same time Young's modulus decreased with increasing water, content. It is suggested that stress-induced motion of water is responsible for the increased stress rate dependency. In addition, the apparent value of Young's modulus decreased with decreasing stress rate. This phenomenon was explained in terms of the visco-elastic property of the glasses.1. Introduction.-Water in the environment is well known to affect the mechanical strength of glass [1,2]; the strength measured in water is about one half of that measured in vacuum [3], and the strength decreases with increasing loading time (static fatigue) and with decreasing stress rate (dynamic fatigue) [4]. On the other hand, very little is known about the effect of water in glass on its mechanical strength. Recently, Wu [5] reported some data showing that the elastic modulus and the strength of hydrated silicate glass decreased with increasing water content, while McMillan et al [6] reported that the bending strength of the soda-lime silica glass with a small amount of water (below 780 ppm) was not influenced by the water content. So far, no research has been reported on details of the effect of the water in glass on the strength, especially on fatigue phenomenon.In this study, the stress rate dependency of the mechanical strength and the elastic modulus of the sodium silicate glass with high water content were investigated.

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confidence: 91%

Dynamic Fatigue of Sodium-Silicate Glasses With High Water Content

Ito

Tomazawa

1982

J. Phys. Colloques

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“…Stress corrosion preferentially occurs in silicate-based ceramics, resulting in bond rupture due to hydrolysis 16) . The binding of Si-O-Si at the tip of a crack splits into Si-OH and OH-Si under aqueous conditions with tensile stress.…”

Section: Discussionmentioning

confidence: 99%

“…In industrial ceramics, the deleterious effect of slow crack propagation can be attributed to a stressenhanced chemical reaction, known as "stress corrosion", that occurs in the presence of water vapor at a crack tip 16) . However, the effects of water on dynamic crack propagation in dental ceramics have not been confirmed.…”

Section: Introductionmentioning

confidence: 99%

Fatigue of Tooth-colored Restoratives in Aqueous Environment

et al. 2007

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The purpose of this study was to investigate the interaction between mechanical and chemical fatigue in resin composites and dental ceramics, and the effects thereof on fatigue resistance of tooth-colored restoratives. To this end, the fatigue fracture resistance of restoratives under dry and aqueous conditions were analyzed by a dynamic fatigue crack propagation test using beam-shaped specimens with a precrack. Fatigue crack propagation characteristics were expressed by the correlation between fatigue crack growth rate (da/dN) and stress intensity factor range (ΔK). In addition, fatigue crack growth threshold (ΔKth) was calculated. Following the fatigue test, a fractographic examination was performed using scanning electron microscopy. Fatigue crack initiation was retarded in resin composites under aqueous condition, but dental ceramics were susceptible to slow crack growth after crack initiation. SEM images of the fatigue facture surfaces reflected inorganic and organic filler particles of different sizes in composites and the bonding at crystal-glass interface in ceramics. It was concluded that water exerted different effects on the fatigue resistance of composites and ceramics.

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“…On the other hand, the n value of the high-alumina brick at room temperature was similar to that at 1 273 K and slightly increased at 1 473 K. The extent of the increase was not as much as that of n of the silica brick. Figure 11 shows the relationship between the index n and the alumina content in the bricks at room temperature along with n values of silica glass 7,[19][20][21] and alumina ceramic 3,5,6) as brittle materials. The n values decreases as alumina content decreases.…”

Section: Fracture Dynamical Discussion Of Refractory Materialsmentioning

confidence: 99%

Fatigue Failure Behavior of Al2O3^|^ndash;SiO2 System Bricks under Compressive Stress at Room and High Temperatures

Hino¹,

Kiyota²

2012

ISIJ Int.

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The fatigue failure behaviors of high-alumina brick, agalmatolite brick and silica brick refractory materials were investigated at room temperature and high temperature. As a result, fatigue fracture lives at room temperature are almost the same with the order of high-alumina > agalmatolite > silica. In comparison with other inorganic materials, fatigue failure life in this work was slightly higher than that of silica glass and alumina ceramic.At high temperatures, it should be noticed that fatigue failure lives of the agalmatolite and silica bricks showed significant increases at the temperatures over 1 473 K. On the other hand, the high-alumina brick showed slight increase. The behavior of strain rate at high temperatures proved that the strain rate of the silica brick mainly increased as a result of crack growth, while crack growth in the high-alumina and agalmatolite bricks increased as a result of creep deformation.Moreover, the reason why fatigue fracture at high temperatures increased in the agalmatolite and silica bricks was examined in more detail. It was deduced that the longer fatigue fracture lives at high temperatures were related to the generation of a slight amount of liquid phase. The degree, of how long fatigue fracture life would be, was estimated to be dependent on the wettability between the solid phase and liquid phase; poor wettability elongated fatigue fracture life.

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Dynamic Fatigue of Glass

Cited by 240 publications

References 2 publications

Dynamic Fatigue of Sodium-Silicate Glasses With High Water Content

Dynamic Fatigue of Sodium-Silicate Glasses With High Water Content

Fatigue of Tooth-colored Restoratives in Aqueous Environment

Fatigue Failure Behavior of Al2O3^|^ndash;SiO2 System Bricks under Compressive Stress at Room and High Temperatures

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