The theoretical analysis of thrust-induced delamination in hemispherical drilling composite materials was investigated in this study. The theoretical analysis indicated that the thrust force of hemispherical drill at drill and delamination ratio (s) about 0.8 has a significant effect on prevention of delamination damage in drilling composite materials. The maximum thrust force of hemispherical drill at α = 2, however, was about 36% of that of twist drill. In other words, hemispherical drill has a correspondence with lower bearing stresses on drilling-induced delamination, which is liable to cause separation of plies at the exit as the interlaminar bonding yields.
Theoretical Analysis of Thrust-Induced Delamination in Hemispherical Drilling Composite Materials
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Tsao, C, & Kuo, K. "Theoretical Analysis of Thrust-Induced Delamination in Hemispherical Drilling Composite Materials." Proceedings of the ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. Volume 1: Applied Mechanics; Automotive Systems; Biomedical Biotechnology Engineering; Computational Mechanics; Design; Digital Manufacturing; Education; Marine and Aerospace Applications. Copenhagen, Denmark. July 25–27, 2014. V001T01A012. ASME. https://doi.org/10.1115/ESDA2014-20633
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