The result of a failure analysis, a glass expert presents several views of a 180µ diameter origin (nickel sulfide particle) of a failed tempered glass door. The upper left photomicrograph is taken with a low power optical microscope and it includes the NiS particle and the initial Wallner lines. Upper right and lower left are […]
Failure Analysis Expert shows Nickel Sulfide Particle
Failure analysis expert observed a nickel sulfide particle using Nomarski optics. The various colors show different elevations of the surface around the particle. This particle was at the origin of a failed tempered glass door. This is an interesting result of a glass failure analysis performed on the door. […]
Glass Expert Analyzes Wine Bottle Defect
A glass expert was asked to examine poor quality bottles received by a winery. The issue was whether this product defect would significantly lower the strength of the bottle and would present a product liability problem. The photo on the upper left is a photograph of the manufacturing defect. It is a 4 inch horizontal […]
Glass Expert Analyses a Broken Bottle
Glass failure analysis expert witness performs a root cause failure analysis on a broken bottle. This bottle broke into pieces (lowerleft figure). A failure analysis determined that the failure origin was in the bottle neck under the plastic cap (lower right figure). The glass expert removed the cap and the the residual polish (top left figure). […]
Tempered Safety Glass
California glass failure expert discusses the safety aspects of tempered glass; Tempered glass is safer than standard (i.e. annealed) glass because “dices” into small pieces under certain failure modes. In reality, the overall glass failure is driven by residual stresses put into the glass by the tempering process. That is, tempered glass “destroys” itself. If […]