Template:Glass physics see also: Difference between revisions
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'''Fracture mechanics''' |
'''Fracture mechanics''' |
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Unfortunately, the theory of [[fracture mechanics]] in [[brittle]] materials is quite laborious - though interesting. The good news is that we already have an excellent start on the subject in our article on [[fracture mechanics]]. In my opinion, the key texts in this field have been authored by [http://www.amazon.com/dp/1878907042 R.W.Davidge], [http://www.amazon.com/dp/0521409721 Brian Lawn] and [http://www.amazon.com/s?url=search-alias%3Dstripbooks&field-keywords=An+introduction+to+the+mechanical+properties+of+ceramics%5D%5D&x=13&y=22 David Green] as part of the Cambridge Solid State Science Series, with UCSB's [http://archive.sciencewatch.com/interviews/tony_evans.htm A.G 'Tony' Evans] from [http://www.princeton.edu/~cml Princeton] on the cutting edge in the field of [[composite material]]s. Based on the texts alone, we could easily double (or even triple) the size of the current article to include additional key factors, such as the movement of dislocations (and other microstructural features), the local chemistry in the vicinity of a crack tip, and their net impact on creep, fatigue, plastic deformation and [[crack]] tip propagation in glasses and glass-ceramics. In addition: |
Unfortunately, the theory of [[fracture mechanics]] in [[brittle]] materials is quite laborious - though interesting. The good news is that we already have an excellent start on the subject in our article on [[fracture mechanics]]. In my opinion, the key texts in this field have been authored by [http://www.amazon.com/dp/1878907042 R.W.Davidge], [http://www.amazon.com/dp/0521409721 Brian Lawn] and [http://www.amazon.com/s?url=search-alias%3Dstripbooks&field-keywords=An+introduction+to+the+mechanical+properties+of+ceramics%5D%5D&x=13&y=22 David Green] as part of the Cambridge Solid State Science Series, with UCSB's [http://archive.sciencewatch.com/interviews/tony_evans.htm A.G 'Tony' Evans] from [http://www.princeton.edu/~cml Princeton] on the cutting edge in the field of [[composite material]]s. Based on the texts alone, we could easily double (or even triple) the size of the current article to include additional key factors, such as the movement of dislocations (and other microstructural features), the local chemistry in the vicinity of a crack tip, and their net impact on creep, fatigue, plastic deformation and [[crack]] tip propagation in glasses and glass-ceramics. In addition: |
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'''Transformation toughening''' has emerged on the assumption that [[zirconia]] (ZrO<sub>2</sub>) undergoes several structural [[phase transformations]] between room temperature and practical [[sintering]] (or firing) temperatures (1000-1500°C). Thus, due to the volume restrictions induced by the glassy/ceramic matrix, metastable crystalline structures can become frozen in which impart an internal strain field surrounding each submicron zirconia inclusion upon cooling below the equilibrium transformation range. This enables a zirconia particle (or inclusion) to absorb the energy or [[stress intensity factor]] of an approaching [[crack]] tip front in its nearby vicinity, drastically increasing the [[fracture toughness]]. |
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