An interesting failure of steel tubing was observed when 1 3/4″ diameter A513 Type 5 steel tubing was being bent in a tubing bender. In this case the tube was clamped into the bender in the wrong location. At this time the clamp bolt had made an indentation (nick) in the pipe surface. The pipe […]
Brass Plumbing Failure Analysis Stress Corrosion Cracking (SCC)
California failure analysis expert witness has analyzed numerous plumbing failures involving yellow brass (i.e. brass with more than 30% Zn in the alloy). The two major brass failure modes in yellow brass are dezincification and stress corrosion cracking. Above are two samples of stress corrosion cracking. Sress corrosion of yellow brass commonly involves the presence of ammonia along with the […]
California Failure Analysis Expert Witness Examines Window Damage
Window cleaning is an important final step in finishing off construction of a building. This fact is sometimes ignored, and improper cleaning results in significant damage to the new windows. This in turn leads to a lawsuit. The glass association of North America (GANA) has published a bulleton to instruct as to the proper window cleaning […]
Failure Analysis of Glass Pot: Visions Cookware
A failure analysis was performed on a broken 5 quart stove top glass pot. The origin was determined with optical microscopy, and the broken pot was assembled to show how cracking proceeded. The re-assembled pot is shown upside down in the upper left photograph. The failure originated at a preexisting “chip” on the interior at […]
Rubber Failure Analysis Demonstrates Rubber Fatigue
California rubber failure analysis expert performs a failure analysis on a rubber paddle. This piece failed as a result of fatigue. The fatigue failure initiated on the outer surface at a stress riser and progressed inwards. This is demonstrated by the photomicrographs above. Upper left is taken at 10X. Upper right is taken at 40X. […]
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