Materials (Jul 2024)

Strain Measurement during Quasi-Static and Cyclic Loads in AL-6XN Material Using Digital Image Correlation Technique

  • Donovan Ramírez-Acevedo,
  • Ricardo Rafael Ambriz,
  • Christian Jesús García,
  • Cesar Mendoza,
  • David Jaramillo

DOI
https://doi.org/10.3390/ma17153697
Journal volume & issue
Vol. 17, no. 15
p. 3697

Abstract

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A customized digital image correlation (DIC) system was implemented to monitor the strain produced in a cold-rolled AL-6XN stainless steel plate, 3.0 mm thick, subjected to quasi-static and cyclic loading tests. A comparison of the DIC strain measurements was made against those provided by conventional extensometers. Furthermore, the DIC system was used to monitor the fatigue crack initiation in low-cycle fatigue tests. The true stress–strain behavior for the AL-6XN material was properly captured by the DIC measurements. For low-cycle fatigue tests (strain control), the strain mapping generated by DIC allowed for identifying zones with higher strain than the nominal strain amplitude applied (εa) since the first stages of the fatigue life (FL). These zones become potential fatigue crack initiation sites.

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