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Engineering and Scientific Consulting


   Milwaukee Area Lab
N144 W6466 Pioneer Rd
Cedarburg, WI 53012



Water Fitting Fracture  
An inexpensive bathroom faucet fitting cracked and caused around $20,000 damage to a finished basement. Synergy Technologies was asked to perform a failure analysis for this loss. This fracture was analyzed using stress analysis techniques. Exemplars were lab tested to duplicate the failure, and it was found that the sharp corners on the inside of the fitting, shown by the arrows in the photo, were the cause of the fracture. The sharp corners allowed the finger--tightened nut to fracture when torqued to a normal level. What occurred is called the stress riser effect, which causes the stress level to be much higher than normal if the radius of the corner is very small. The smaller or sharper the corner, the more the stress is magnified.



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