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Advisor(s)
Abstract(s)
This paper presents an innovative ‘strain acceleration method’ for determining the onset of diffuse necking in
sheet forming tests using data obtained from digital image correlation (DIC). The method identifies the onset
time of diffuse necking and provides the corresponding in-plane principal strain values by detecting a local
extreme in the second derivative of the minor principal in-plane strain with respect to time at the edges of the
sheet surface region where diffuse necking occurs. Results obtained from applying the method to tensile testing on two different materials and comparisons with available methods based on force-time or principal strain rate evolutions confirm its accuracy and validity. The new method was implemented in a computer software to be used for research and education that also enables determination of localized necking and fracture and plotting the strain loading paths in principal strain space.
Description
Keywords
sheet forming diffuse necking experimentation digital image correlation software education
Citation
Sampaio RFV, Pragana JPM, Bragança IMF, Silva CMA, Martins PAF. A strain acceleration method to identify the onset of diffuse necking. Advances in Industrial and Manufacturing Engineering. 2024; 9, 148, https://doi.org/10.1016/j.aime.2024.100148
Publisher
Elsevier