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Impact and Fatigue Failure of Resistance Spot Welds

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WIL is a Mechanical Engineer, Theoretical and Applied Mechanics Expert with world-class expertise in structural mechanics, fatigue and impact failure of welds, resistance spot welds, root cause failure analysis, fracture of structures, fuel cell durability, bio-engineering, computer vision in metrology, structural integrity, nuclear reactors, pressure vessels and piping stress analysis, and welding modeling.

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Resistance spot welds are used extensively in every modern vehicle to connect sheet metal pieces together. During normal operation of a vehicle, spot welds fatigue and finally fail. In the event of crash, spot welds are often the weakest link in separation of the vehicle structure. Fatigue life of spot welds from different grades of steels, aluminums and other materials, various welding schedules and layout were determined in our laboratory and analysis was provided for vehicle design. Characteristics in impact failure of spot welds under different impact speed were also studied in detail both theoretically and experimentally. Strain rate effect in impact failure strength of spot welds was the main focus. Failure mode of spot welds, e.g. interfacial mode or pull-out mode which could be due to inferior welding design, was investigated as well. The results provide invaluable technical information to auto industry.

Read other articles by this KKAI Associate:

Failure of Composite Cylinder Under Implosion

Forensic Study on a Car Accident

Mechanical Engineer, Theoretical and Applied Mechanics Expert, structural mechanics, fatigue and impact failure of welds, resistance spot welds, root cause failure analysis, fracture of structures, fuel cell durability, bio-engineering, computer vision in metrology, structural integrity, nuclear reactors, pressure vessels and piping stress analysis, and welding modeling.
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Kevin Kennedy & Associates, Inc.
Rapid Response Engineering® Solutions
3905 Vincennes Road, Suite 320
Indianapolis, Indiana 46268
(317) 536-7000 voice
(317) 536-7220 fax

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