Journal
COMPOSITE STRUCTURES
Volume 127, Issue -, Pages 411-419Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2015.03.028
Keywords
Countersunk composite joints; Single-lap; Bolt-hole clearance; Bolt torque; Bearing tests; 3D Digital Image Correlation
Categories
Funding
- National Natural Science Foundation of China [51205014]
- China Postdoctoral Science Foundation [2013M540841, 2013T60053]
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An experimental study on the effect of bolt-hole clearance and bolt torque on single-lap, single-bolt, countersunk composite joints are presented. The specimens were manufactured from carbon fiber/epoxy unitapes with quasi-isotropic lay-ups. Bearing stress/bearing strain behavior, bearing strength and joint stiffness were obtained according to ASTM standard D5961. The interaction between bolt-hole clearance and bolt torque on bearing response was evaluated by varying multiple parameters. One focus was to evaluate the surface strain distribution and the out-of-plane deformation of the joints by using a commercial 3D Digital Image Correlation (DIC) system. It is found that there is interaction between bolt-hole clearance and bolt torque on joint stiffness loss and 2% offset bearing strength. Furthermore, bolt-hole clearance intensifies the surface strain concentration and the out-of-plane deformation of the joints. Bolt torque alleviates the surface strain concentration, but has little effect on the out-of-plane deformation. (C) 2015 Elsevier Ltd. All rights reserved.
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