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Given the random appearance and extent of hot tearing, what reliable predictive model can be developed for magnesium alloy AZ 91?
Hot tearing criteria can be roughly compiled in several main groups: stress-based, strain-based, strain rate-based and nonmechanical.
As such, the significant variation of the molecular structure during the tear process should be considered to fully understand tearing in PE films.
The reason you need moisture for eyes that already "water" is that tearing is frequently due to irritation.
Predicting the changes in the tearing energy as ar elastomer ages over long periods of time would be useful in predicting failures of many automotive elastomeric components.
If you have one, the Tearscope is a useful device for observing the lipid layer (Figure 3) as it utilises a cold light source to minimise reflex tearing and evaporation, but it is no longer commercially available: for most practitioners the slit lamp (high magnification) is sufficient for this purpose.
However, the alloy is used almost exclusively in the sand casting process because it exhibits poor hot tearing resistance when poured into metal molds.
To prevent tearing in a nail that has been loose for a while, cut all the loose nail away at the attachment site.
Laboratory tests indicate that MPE-B may provide improved performance against tearing and abrasion in hiking boots.
However, when Kaswan and her colleagues tested cyclosporine eye drops in dogs, they found the drug substantially restored tearing, reduced corneal scar tissue and speeded the healing of corneal ulcers.
Although the problem of hot tearing has been known for many years, and the relationship between melt chemistry, temperature and stress has been investigated, only recently have unified solidification and stress simulations been used to predict hot tearing problems in steel castings.
The low-lead tin bronze (alloy C83450) was the most difficult to cast in a permanent mold because of its high drossing tendency and proneness to hot tearing.