The Materials Analyst, Part 110: The interaction of design, material selection, and processing in the failure of a gear—Part 3The Materials Analyst, Part 110: The interaction of design, material selection, and processing in the failure of a gear—Part 3
When a molded part fails, a search inevitably begins for the cause. But there may not be one. That is, there may be several, plus relationships between them that can add layers to the problem.
October 20, 2009
As outlined in the first two parts of this case study, some detailed examination of failed gears as well as a thorough engineering analysis of the stresses in the application and the long-term behavior of the polymer used had produced a reasonable explanation for the root cause of the failures. However, the model used to characterize the material’s long-term properties still predicted a time to failure that was two to three times the actual lifetime of the parts coming back from the field.
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