Potential of DSP Method for Strain Distribution Analysis on Damaged Laminates

• Main Author: Dufaix, Guillaume
• Format: Bachelor Thesis
• Language: English
• Published: 2007
• Subjects: Technology; Laminates; Composites; Damage; DSP; Microcracking; Strain; distribution; Teknik; Luleå
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-51371

At Luleå University of Technology, the Division of Polymer Engineering wants to find a way to observe the strain and stress distribution on a damaged laminate. That’s why this work investigates the potential of DSP method (Digital Speckle Photography Method) for this analysis. The goal of this work is to determine the limit of this system and so find a solution in order to use DSP method for strain field calculation. The first part of this project is modelling of a damaged laminate with FE-method. The second part of this thesis is to analyse the strain distribution with a DSP system and the limit of this project. To summarize, the main problem of this system is the difficulties to correlate because of the large displacement of the specimen. The second point is the smallness of the strain variation. So in order to solve this problem, three proposals are made: to use thermal load instead of a structural load, use a tensile machine with symmetric displacement, and to modify the DSP program in order to permit large displacement thanks to pre-programmed displacement. Validerat; 20101217 (root)