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As a conclusion, the silicone as an LED encapsulant could induce flaws, the material properties in larger coefficient of thermal expansion (CTE) and stronger adhesion should be considered in the package design stage, and the degradation of phosphor silicone composites led to a fast light energy loss during the initial high temperature aging test, and then reached up to steady.
The miscoding of these conditions may induce serious flaws in the inter-hospital comparison.
One may suspect that a milling process like the one used to make the Denzir copings, induce more flaws than a pressing and sintering technique as the one used to make Procera copings.
Failure of the composites was due to either oxidation-induced unbridged crack growth, which dominated the higher stress regime (⩾179 MPa) or controlled by degradation of the fibers, probably caused by intrinsic creep-induced flaw growth of the fibers or internal attack of the fibers via Si diffusion through the CVI SiC and/or microcracks at the lower stress regime (⩽165 MPa).
In the case of Procera, one cannot exclude the possibility that flaws are induced when copings are pressed and that these flaws may not heal completely during sintering.
The results demonstrate that the linear perturbation theory provides a very promising way in predicting frequency changes induced by small structural flaws.
This paper aims at developing a computationally efficient perturbation technique to quantify the frequency shifts induced by small structural flaws, based on the FE simulated resonance spectrum for the perfect part.
The influence of microstructure induced fracture properties (multiple-modal flaw size distribution, R-curve behavior and subcritical crack growth) on strength distributions is discussed.
Critical flaws may be induced in the structure requiring repair before the next scheduled inspection.
However, FE-based simulations can be time consuming in examining the spectrum shifts induced by all possible structural flaws.
After polishing, the diamond is reexamined for possible flaws, either remaining or induced by the process.
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