Contact residual stress relaxation in soda-lime glass

Kese, Kwadwo; Li, Z. C.; Bergman, Bill

doi:10.1016/j.jeurceramsoc.2004.12.018

Cited by 11 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the six standard deviations σ Ge defining the tetrahedra are represented as a function of the Ge content (Fig. 33, left), it is found, indeed, that the angular motion involving the fourth neighbour (PBADs 104,204,304) exhibits a substantial increase once the system is in the stressed rigid phase, while the others (102,103,203) are left with a similar angular excursion close to the one found for the oxides (SiO 2 , GeO 2 ) where it was concluded [310] that tetrahedra were rigid. This underscores the fact the quantity σ Ge is an indicator of stressed rigidity [289].…”

Section: Topological Constraintsmentioning

confidence: 91%

“…Such stress relaxation measurements have some importance in field of ion exchange glasses (e.g. sodium borosilicates) because of the strengthening of the glass surface that is steadily improved [100,101], while it has also been considered for soda-lime [102,103,104] or borosilicate glasses [105]. For the latter [105], a long-time study has permitted the first detectable signatures of glass relaxation far below T g (T /T g ≃0.3), and the measure of strain with time, in other words, the relaxation of the glass, follows a stretched exponent with a Kohlrausch exponent β=0.43 that has been predicted from dimensional arguments [106].…”

Section: Stress Relaxationmentioning

confidence: 99%

“…Right: Distribution of Ge angular standard deviations using individual constraints [287]. The total distributions have been split, depending on the neighbor rank : angles involving the first three neighbors (102,103,203, black symbols), and the fourth neighbor (104,204,304, red symbols). The solid curves are Gaussian fits which serve to estimate the population of broken constraints at high x content.…”

Section: Topological Constraintsmentioning

confidence: 99%

“…Right: Distribution of Ge angular standard deviations using individual constraints. The total distributions are split, depending on the neighbor rank : angles involving the first three neighbors (102,103,203), and the fourth neighbor (104,204,304, shifted).…”

Section: Topological Constraintsmentioning

confidence: 99%

See 3 more Smart Citations

Relaxation and physical aging in network glasses: a review

Micoulaut

2016

Rep. Prog. Phys.

View full text Add to dashboard Cite

Abstract. Recent progresses in the description of glassy relaxation and ageing are reviewed for the wide class of network-forming materials such as GeO 2 , Ge x Se 1−x , silicates (SiO 2 -Na 2 O) or borates (B 2 O 3 -Li 2 O), all of them having an important usefulness in domestic, geological or optoelectronic applications. A brief introduction of the glass transition phenomenology is given, together with the salient features that are revealed both from theory and experiments. Standard experimental methods used for the characterization of the slowing down of the dynamics are reviewed. We then discuss the important role played by aspect of network topology and rigidity for the understanding of the relaxation of the glass transition, while also permitting analytical predictions of glass properties from simple and insightful models based on the network structure. We also emphasize the great utility of computer simulations which probe the dynamics at the molecular level, and permit to calculate various structure-related functions in connection with glassy relaxation and the physics of ageing which reveals the off-equilibrium nature of glasses. We discuss the notion of spatial variations of structure which leads to the picture of "dynamic heterogeneities", and recent results of this important topic for network glasses are also reviewed.PACS numbers: 61.43. Fs, 64.70.kj Relaxation and physical ageing in network glasses 2 Figure 1. Typical network-forming glasses: a) A stoichiometric glass former (SiO 2 , B 2 S 3 ) whose structure and network connectivity can be altered by the addition (b) of 2-fold coordinated atoms (usually chalcogens, S, Se) that lead to cross-linked chains. The structure can also be depolymerized (c) by the addition of a network modifier (alkali oxides or chalcogenides, Na 2 O, Li 2 S, etc.). Glassy dynamics depends strongly on the network topology, i.e. the way bonds and angles arrange to lead to a connected atomic network. Note that only chalcogenides can produce a mixture of these three kinds of basic networks, e.g. (1-x)Ge y Se 1−y -xAg 2 Se [2], and for the latter system x=0 corresponds to case (b), y=33% corresponds to case (c), and both conditions together (x=0,y=33 %) to case (a).

show abstract

Section: Topological Constraintsmentioning

confidence: 91%

Section: Stress Relaxationmentioning

confidence: 99%

Section: Topological Constraintsmentioning

confidence: 99%

Section: Topological Constraintsmentioning

confidence: 99%

See 2 more Smart Citations

Relaxation and physical aging in network glasses: a review

Micoulaut

2016

Rep. Prog. Phys.

View full text Add to dashboard Cite

show abstract

“…1a, b) are widely used to model the flaws produced in manufacturing processes such as grinding, cutting, and polishing [36]. Cracks induced by Vickers indentation are also used as model cracks for thermal shock studies [37,38], crack healing studies [39][40][41][42], R-curve evaluation [43], residual stress studies [44], and in the design of dental crowns [45].…”

Section: Introductionmentioning

confidence: 99%

The effect of indentation-induced microcracks on the elastic modulus of hydroxyapatite

2012

View full text Add to dashboard Cite

The presence of microcracks in materials affects a wide range of mechanical properties including elastic modulus, Poisson's ratio, fracture strength, and fracture toughness. The microcrack-induced reductions of the Young's modulus, E, and Poisson's ratio, t, are functions of the size, geometry, and number density of microcracks. In this study, an array of Vickers indentation-induced microcracks was placed on the surfaces of two hydroxyapatite (HA) specimens with totals of 391 and 513 indentations per specimen. This study tests the validity of theoretical studies of microcrack damage-induced changes in E and t, where the changes are expressed either by (i) the volumetric crack number density, N and (ii) the crack damage parameter, e. All elasticity measurements were done via resonant ultrasound spectroscopy. For both the HA specimens included in the study and alumina specimens indented in an earlier study [J Mater Sci 38:1910. doi: 10.1007/BF00595764, 1], E and t decreased approximately linearly with increasing microcrack damage. The slopes of the E and t versus N and e are also computed and compared to the available theoretical models.

show abstract