A new barn built with galvanized and painted steel demonstrated the type of defect shown in the photograph on the left. After less than one year verticle lines of white spots appearedon the painted surface. These spots were examined by a coating engineer to determine the root cause of the defect. Associated […]
Glass Failure Analysis of Vehicle Windows
Glass Failure Expert reminds users that there are two types of windows in automobiles. All the side and rear windows are made with fully tempered glass. This is required for safety. These windows will break into small “cubes”, and they are less likely to cut the occupants during an accident. The windshield is made from […]
Failure Analysis of Broken Soda Bottle
Glass Failure Expert Performs a Failure Analysis Broken Soda Bottle; The subject bottle had not yet been opened; it failed as it was being loaded into a cooler. The failure analysis photograph above shows the fracture origin. It shows that this bottle failed as a result of a defect on the interior wall of […]
Glass Failure Analysis of Wine Bottle
A recent failure analysis performed on a wine bottle revealed a manufacturing defect. The initiating manufacturing defect is a piece of unmelted glass (see photo above). More information on this can be found in my failure analysis blog There is a recent white paper that discusses the failure analysisi in detail.
Weld Failure on Crane
While studying a weld failure on a tower crane section, it was discovered that the weep(drain) holes were plugged. As a result, there was standing water that froze and split the weld. The failure mode was ductile overload that started at a stress concentrator created by the weld meniscus The destructive force is created by […]