Improving DIC Accuracy in Experimental Setups. Issue 7 (17th April 2019)

• Record Type: Journal Article
• Authors: Reis, Martin; Adorna, Marcel; Jiroušek, Ondřej; Jung, Anne
• Is Part Of: Advanced engineering materials. Volume 21:Issue 7(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-04-17
• Subjects: digital image correlation -- experimental mechanics -- measurement noise -- metal foam -- three‐point bending; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201900092
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Digital image correlation (DIC) is a common software tool to measure displacement and strain fields on the surface of a specimen during mechanical testing. Due to its low requirements on the experimental setup and the simple usability it is widely spread in the community of applied mechanics. Nevertheless, the real noise of the method often stays uninvestigated. Therefore, this work shows different approaches to measure errors in DIC. The present contribution proves lighting as the main error source and it shows that a series of static images allows to estimate the error level of the DIC before performing the experiment. To give a proof of concept of the improved DIC setup, three‐point bending tests on single struts of aluminum foam are performed and evaluated. Abstract : Error estimation in digital image correlation (DIC) often remains unobserved. Therefore, the present contribution proves lighting as the main error source and it shows that a series of static images allows to estimate the error level of the DIC from before performing the experiment. Three‐point bending tests on single struts of aluminum foam are performed and evaluated as proof of concept.