Manufacturing processes interaction over the final residual stress state of crankshasfts

Abstract:

Different residual stress magnitude and profile are generated after every crankshaft manufacturing stage. The
processes are often investigated separately, regardless of their possible interaction. The acknowledgement of such interactions can be useful when investigating crankshaft fatigue behavior. This study contributes to the matter by evaluating the resultant residual stress generated at the fillet region after crankshaft’s machining and deep rolling processes. Prior to it, a procedure was developed to guarantee the position of the samples in the X-ray diffractometer after surface electropolishing and depth measurement. Repeatability and reproducibility analyses attest the measurements’ accuracy. An in-depth profile assessment was made at the crankpin top and bottom regions in two stress directions. The influence of the machining process over the residual stress left after deep rolling can be inferred. Moreover, unexpected residual stress results, and consequently fatigue behavior, can be better understood with more data regarding the whole manufacturing chain.

Reference:
FONSECA, Luiz G. Aun; BATALHA, Mario Henrique Fernandes; FARIA, Alfredo R. de; JAHED, Maid. Manufacturing processes interaction over the final residual stress state of crankshasfts. In: THE JOINT CONGRESS OF THE CANADIAN SOCIETY FOR MECHANICAL ENGINEERING AND CFD SOCIETY OF CANADA, 2019, London, Ontario, Canada. Proceedings… 8 p.

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