A method for strain analyses of surfaces with curved boundaries based on measured displacement fields. (2019)

• Record Type: Journal Article
• Authors: Lehmann, Thomas; Stockmann, Martin; Ihlemann, Jörn
• Is Part Of: Materials today. Volume 12:Part 2(2019)
• Page Start: 200
• Page End: 206
• Publication Date: 2019
• Subjects: Electronic Speckle Pattern Interferometry -- Strain field -- Displacement field -- Approximation -- Parametrization -- Curved boundaries; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2019.03.114
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: This contribution deals with investigations of strain fields at the specimen surface. A notched cantilever beam made of epoxy was analyzed. In the notch-surrounding area inhomogeneous strain distributions with large gradients occur. For the detection of these strain fields, high-performance measuring methods and special evaluation methods are required. The detection of in-plane displacement fields was performed using Electronic Speckle Pattern Interferometry (ESPI). Based on B-spline approximation of the displacements, strains were determined. Besides a global evaluation, a parametrization of the notch-surrounding area was performed. The results show significant improvement compared to analyses without using the parametrization.