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This paper describes the results of a series of fatigue studies relating the lives of several weld geometries. Rotating beam and axially loaded specimens were used. A comparison between steel and plastic (polyvinylchloride scale models is made. Using plastic scale models of welded structures for fatigue life determination is the ultimate goal of this work.

This paper presents a detailed explanation of the use of plastic models for the stress analysis of complicated structures similar to those encountered in the construction equipment industry. This explanation is supplemented by a specific consideration of the modeling and testing of a tractor-mounted ripper frame that was performed at Dynamics Research & Development Corporation in Toledo.