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Measuring Stress and Strain Fields in Connecting Rods Using Laser Interferometry (ESPI)

[+] Author Affiliations
Bruno F. Vaz, Auteliano A. S. Junior

University of Campinas, Campinas, SP, Brazil

Rafael A. L. e Silva

ThyssenKrupp Metalurgica de Campo Limpo, Campo Limpo Paulista, SP, Brazil

Paper No. IMECE2011-63936, pp. 253-262; 10 pages
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 9: Transportation Systems; Safety Engineering, Risk Analysis and Reliability Methods; Applied Stochastic Optimization, Uncertainty and Probability
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5495-2
  • Copyright © 2011 by ASME


The understanding of how mechanical stresses influence in the behavior of automotive components is of great interest to the automotive industry. The design of products must be performed considering these efforts, always aiming to ensure smooth operation and no failures. To learn more about these efforts, numerical simulation can be done. However, the results obtained from these simulations must be confirmed by carrying out physical experiments. Many methods are available to obtain the stress/strain fields of the object been tested, among which the best known and widespread is the use of strain-gauges. This technique requires a relatively long time of preparation as well as several measurement places to obtain the full stress/strain field. The laser interferometry technique, on the other hand, reduces considerably the testing time to obtain the full stress/strain field, and no intervention on the object is required. This work aims to present a methodology for measuring stress/strain fields in connecting rods using an Electronic Speckle Pattern Interferometry (ESPI) device. In this work we will focus on obtaining the stresses in a flat surface of the rod. The region corresponds to the inner portion of the rod body, excluding only the edges of it that are slightly higher. In this region it’s easier to obtain the stress and strain fields than in the whole rod, which has many non-planar regions with a relatively complex geometry, especially near the ends. To plan the experiments, an experimental design was developed, based mainly on the concepts of Design of Experiments — DOE, to eliminate or at least reduce the influence of the noise over the results. The tests were performed with a forged connecting rod from a local manufacturing, which was submitted to compressive efforts. Finally we present the results of the measurements of the stress and strain fields obtained by the ESPI technique.

Copyright © 2011 by ASME



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