Validación teórico-experimental de la metodología digital image correlation (DIC) para la determinación de desplazamientos y deformaciones en distintos tipos de ensayos cuasi estáticos y dinámicos.

Abstract

The present theoretical-experimental validation study is carried out with the purpose of evaluating the possible applicability of a new methodology for measuring displacements and deformations using only photographic equipment accompanied by extremely simple equipment that works with software for digital image correlation (DIC ), and without the need for the use of conventional instrumentation such as LVDT's or Strain Gauges within the CIV laboratory, for this purpose the comparison of results using both methods on four tests with different characteristics, three quasi-static and one dynamic, is proposed. The use of three different programs with different origins that go according to the processing of digital images, GOM Correlate, Ncorr and DICe, is proposed, these together with the LVDT's analyze the quasi-static tests: post-tensioned masonry resistant to lateral and vertical loads, mixed structural walls concrete – steel and fiber cement masonry; and to the dynamic test: metal structure to scale on a vibrating table in two scenarios, the first directly embedded in the table and the second placed on sand. Finally, a visual analysis of the results obtained from all the programs and the LVDT's is carried out using the displacement vs. time curves and a precision analysis based on statistical parameters that indicate the accuracy of the proposed programs, comparing them with each other and globally as DIC relating it to traditional instrumentation, validating its use for its application within the CIV.