crack initiation and mechanical fatigue of silica glass
Fatigue Analysis of Hybrid Glass Carbon Epoxy Composite
a relatively poor resistance to crack initiation and growth thus affecting the overall mechanical properties including the fatigue and fracture behavior of FRP composites. One of the ways to improve the mechanical properties of FRPs is to add a second phase of fillers into the epoxy matrix.
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Advancements in Mechanical Strength and Reliability of
measured fatigue values.24 25 The effects of material properties flaws and stress on fatigue will continue to be an area of research and discussion. Figure 5. Dynamic fatigue and inert strength of T08 silica glass with different fictive temperatures18 2.2. Flaw Characterization Flaws in optical fiber have been studied for many years.26 27
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The Tensile Fatigue Behavior of a Glass-fiber Reinforced
poor resistance to crack initiation and growth which adversely affects the overall fatigue and fracture performance of FRP composites when they employ such brittle epoxy matrices. One of the ways to enhance the mechanical properties of FRPs is to improve the properties of the epoxy matrix by incorporating second-phase fillers in the resin.
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Surface structural relaxation of silica glass a possible
Oct 15 2004 · This mechanical fatigue of silica glasses is an important concern when long time usage of a silica glass product is intended as in the case of silica glass optical fibers. Various different mechanisms of mechanical strength degradation have been proposed but questions still remain.
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Fracture and toughening mechanisms of silica- and core
The highly cross-linked thermosetting polymers used as adhesives and as the matrices of fibre composites for the construction of lightweight vehicles are very brittle and finding effective toughening solutions for such engineering applications is a long-standing problem. An anhydride-cured thermosetting epoxy polymer has been modified by the addition of different wt of silica nanoparticles
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The fatigue behaviour of a glass fiber-epoxy composite
The tensile fatigue behaviour of a silica nanoparticle-modified glass fibre whereby the polymer is relatively brittle and haa poor resistance to crack initiation and growths . 14 . E-glass fibre noncrimp fabric- pieces about 330 mm square were cut and laid up in a qua- si
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Fracture mechanicsWikipedia
Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material s resistance to fracture.. Theoretically the stress ahead of a sharp crack tip becomes infinite and cannot be used to
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Advancements in Mechanical Strength and Reliability of
measured fatigue values.24 25 The effects of material properties flaws and stress on fatigue will continue to be an area of research and discussion. Figure 5. Dynamic fatigue and inert strength of T08 silica glass with different fictive temperatures18 2.2. Flaw Characterization Flaws in optical fiber have been studied for many years.26 27
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Frontiers Deformation and Fracture of Silica Glass Fiber
May 29 2020 · Deformation and Fracture of Silica Glass Fiber Under Sharp Wedge-Indentation. Fiber or fiber tapers are the material of choice when studying the mechanical properties and intrinsic load-response of glasses at highest sample quality and experimental repeatability. However surface curvature strongly complicates meaningful analysis using local
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Improved variable amplitude fatigue behavior of a glass
Improved variable-amplitude fatigue behavior of a glass-fiber particles and 10 wt. of silica nanoparticles. Glass-fiber reinforced plastic (GFRP)ite compos from Fig. 6 and Fig. 7 that the GFRP-neat composite is subject to the initiation and growth of matrix cracks to a far greater extent
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(PDF) Mechanical performance of composite structures with
Specimens are tested in tensile condition in order to measure their mechanical strength and to analyze crack initiation fracture paths and delamination. At the same time a FEM model is developed to compare with the experimental observations and to optimize the variables related to patch configuration.
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The tensile fatigue behaviour of a silica nanoparticle
Jan 01 2010 · Crack density of ±45° cracks vs. number of fatigue cycles for GFRP composite with neat and 10 wt. silica nanoparticle-modified matrix. The initiation and growth of interlaminar delaminations particularly from the free-edges of the test specimens was observed with continued fatigue
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The Mechanical Properties of Glass
Introduction to Glass Technology 3 • σ= failure stress i.e. strength of the material • c = flaw size in meters • KIC = Critical stress intensity factor for mode I crack propagation. • KIC has low values for brittle materials high values for tough materials • Value = 0.751.0 MPa-m0.5 for glass Practical Strength of Glass
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Stress Corrosion and Static Fatigue of Glass
Crack velocities in water were measured as a function of applied stress intensity factor and temperature and apparent activation energies for crack mo- tion were obtained. Data were consistent with the universal fatigue curve for static fatigue of glass which depended on glass composition. Of the glasses tested silica glass was most
Get PriceFatigue Failure Behavior of Al2O3–SiO2 System Bricks under
silica brick mainly increased as a result of crack growth while crack growth in the high-alumina and agal-matolite 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.
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The tensile fatigue behaviour of a silica nanoparticle
Jan 01 2010 · Crack density of ±45° cracks vs. number of fatigue cycles for GFRP composite with neat and 10 wt. silica nanoparticle-modified matrix. The initiation and growth of interlaminar delaminations particularly from the free-edges of the test specimens was observed with continued fatigue
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Effect of Silica-Particle Characteristics on Impact/Usual
The structure (crystalline or amorphous) and shape (globular or irregular) of silica fillers were varied and their effects on the impact fatigue and usual fatigue properties in the particle-filled epoxy resins were investigated. The fatigue crack extension process was discussed in terms of initiation and propagation processes. Furthermore the mechanical characteristics of the material were
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Effect of Stress on Water Diffusion in Silica Glass
Won-Taek Han Minoru Tomozawa Effect of residual water in silica glass on static fatigue Journal of Non-Crystalline Solids 10.1016/(91)90405-U 127 1 (97-104) (1991). Crossref Won-Taek Han Minoru Tomozawa Crack initiation and mechanical fatigue of silica glass Journal of Non-Crystalline Solids 10.1016/(90)90230-J
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Factors influencing the mechanism of superlong fatigue
Dec 24 2001 · Guocai Chai Tomas Forsman Fredrik Gustavsson Microscopic and nanoscopic study on subsurface damage and fatigue crack initiation during very high cycle fatigue International Journal of Fatigue 10.1016/j.ijfatigue.2015.10.024 83 () (2016).
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The fatigue behaviour of a glass fiber-epoxy composite
obtaining extended fatigue lives from components manufacture using such modified GFRP composites. The fatigue limit i.e. the maximum applied stress for a life of 106 cycles of the NR composite was about 95 MPa. The presence of the CTBN rubber or silica particles alone in the matrix raises this fatigue limit by about 15 to 110 MPa.
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Dynamics of Wing Cracks and Nanoscale Damage in Glass
We investigate initiation growth and healing of wing cracks in confined silica glass by molecular dynamics simulations. Under dynamic compression frictional sliding of precrack surfaces nucleates nanovoids which evolve into nanocrack columns at the precrack tip. Nanocrack columns merge to form a wing crack which grows via coalescence with nanovoids in the direction of maximum compression.
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The fatigue behaviour of a glass fiber-epoxy composite
The tensile fatigue behaviour of a silica nanoparticle-modified glass fibre whereby the polymer is relatively brittle and haa poor resistance to crack initiation and growths . 14 . E-glass fibre noncrimp fabric- pieces about 330 mm square were cut and laid up in a qua- si
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Fatigue and Fracture Behavior of Glasses Fatigue and
This article discusses the fracture behavior of silicate glasses more specifically soda-lime-silicate glass borosilicate glass and vitreous silica. It analyzes the testing and calculation of dynamic fatigue and slow-crack-growth for lifetime prediction of glasses. The article illustrates the phenomenon of static fatigue and concludes with a
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The Mechanical Properties of Glass
Introduction to Glass Technology 3 • σ= failure stress i.e. strength of the material • c = flaw size in meters • KIC = Critical stress intensity factor for mode I crack propagation. • KIC has low values for brittle materials high values for tough materials • Value = 0.751.0 MPa-m0.5 for glass Practical Strength of Glass
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Effect of ammonia on static fatigue of silica glass
Jun 01 1988 · Dynamic fatigue 7 and static fatigue 9 of both freshly abraded samples with sharp crack tips and treated samples with blunt crack tips of silica glass and high silica glass have already been investigated in various chemicals except ammonia and it was found that all the chemicals investi- gated can cause fatigue in freshly abraded glass
Get PriceStress–corrosion crack growth of Si–Na–K–Mg–Ca–P–O
Both glasses and glass/metal interfaces 23 are subject to environmentally assisted crack growth. The subcritical crack growth behavior of these glasses and their interfaces with Ti-based and CoCr-based implant alloys has to be characterized to assure long-term mechanical stability of the implant in the body. We report here the SCCG
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Improved variable amplitude fatigue behavior of a glass
Improved variable-amplitude fatigue behavior of a glass-fiber particles and 10 wt. of silica nanoparticles. Glass-fiber reinforced plastic (GFRP)ite compos from Fig. 6 and Fig. 7 that the GFRP-neat composite is subject to the initiation and growth of matrix cracks to a far greater extent
Get PriceFatigue Failure Behavior of Al2O3–SiO2 System Bricks under
silica brick mainly increased as a result of crack growth while crack growth in the high-alumina and agal-matolite 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.
Get PriceMechanism of mechanical fatigue of silica glass. Final
Feb 13 2020 · Water/NH3 can exhibit both adsorption and diffusion and the ability of water to initiate a crack appears related to its diffusion into the glass. Mechanical fatigue of pristine silica fibers takes place in water but is not expected in nonaqueous liquids. Water entry into silica glass
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