California failure analysis expert witness examines two distinct fracture surfaces for tempered glass failures. According to the tempered glass expert witness, the surfaces of tempered glass are under compressive stress. This stress is balanced by an “equivalent” tensile stress in the center of the glass. Tempered glass failures are really the end result of self destruction. […]
California Glass Expert Witness Discusses Bending Failure of Tempered Glass
California Glass Expert performs a failure analysis on a tempered glass oven door that failed in bending. Normally the fracture surface of tempered glass shows two sets of Wallner lines that are separated by a band of mist hackle. However if the tempered glass window failure is due to bending, the band of mist hackle […]
California Glass Expert Examines the Edge of Tempered Glass
California glass expert uses a grazing angle surface profilometer (GASP) to study the compressive stresses at the edge of a tempered glass oven door. The edge effects during the air quench step of the thermal temper process are said to lower the surface stress to zero near the edge of the glass article. In fact, […]
Rubber Failure Analysis: Inner Tube Failure
California failure analysis lab performs rubber failure analysis on a failed bicycle inner tube. The rider was braking while descending a long steep hill. Toward the bottom of the hill his inner tube failed, and he heard a loud pop. The wheel rim was too hot to touch. A failure analysis was performed and the failure originated […]
California Failure Analysis Lab Examines Stainless Steel Corrosion Failure
Stainless steel corrosion failures often result from grain boundary sensitization. Many 300 series stainless steel alloys come in two grades or more. For example 304 stainless steel comes as 304, 304L and 304H. Each grade has a different amount of carbon (C). the 304 grade allows up to .0.08% C; whereas 304 L allows a […]
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