Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 200, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2020.108453
Keywords
Secondary bending; Three-dimensional digital image correlation (3D DIC); Multibolted single-lap composite joints; Neutral line model (NLM)
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Consortium for Research and Innovation in Aerospace in Quebec (CRIAQ)
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In this paper, an extensive experimental study was performed to quantify and understand secondary bending (SB) in multi-bolt single-lap joints composed of quasi-isotropic (QI) and cross-ply (CP) carbon/epoxy laminates for two laminate thicknesses. The out-of-plane displacement (OPD), which represents SB, was measured experimentally using a 3D digital image correlation (DIC) system. The SB ratio was quantified as the ratio of out-of-plane displacement (delta(OPD)) to in-plane displacement (d(t)). It is found that delta(OPD)/d(t) ratio measured in CP is approximately 30% higher than in QI. It has also been observed that for a given laminate configuration (CP & QI), the delta(OPD)/d(t) ratio decreases as the tensile load increases. The analytical Neutral Line Model (NLM), which was used in this work, also predicts this trend. Moreover, 3D-DIC measurements show that although delta(OPD) decreases with increasing modulus of elasticity, it increases with increasing thickness of the laminate.
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