Thesis
Effects of drilling parameters and hole quality on pinned joint bearing performance of carbon fiber reinforced plastics laminate
Washington State University
Master of Science (MS), Washington State University
05/2020
DOI:
https://doi.org/10.7273/000004031
Handle:
https://hdl.handle.net/2376/124876
Abstract
Carbon fiber reinforced plastic composite materials (CFRP) are characterized by a combination of high properties specific like strength stiffness and lightweight, which make them popular especially for aircraft and aerospace applications. Machining of CFRP is difficult due to their material discontinuity, inhomogeneity, and anisotropic nature, so collecting and analyzing the mechanism of CFRP drilling and the correlation between the drilling parameters and factors is needed. In this research, the effects of drilling parameters on the hole quality of CFRP laminate are studied through the CFRP drilling experiment. The effects of hole qualities on the CFPR pinned joint bearing performance is studied through the bearing test. The different feed rates of 10 [mu]m/rev, 250 [mu]m/rev, 350 [mu]m/rev and 500 [mu]m/rev at the spindle of speed 6000 rpm and two types of the tool of uncoated carbide and diamond-coated drill bits are discussed hole qualities of hole surface roughness, hole diameter, hole roundness, and hole delamination. The bearing performance is based on the maximum bearing strength, bearing stiffness and critical displacement data that acquired and calculated from the bearing test. The bearing dependency on the CFRP drilling hole qualities is investigated through the comparison of each hole qualities and bearing performance variables and extreme value analysis. The results show that the increasing feed rate makes the decreasing hole diameter for both diamond-coated and uncoated carbide drilled holes. For the hole diameter at a range of 6.35 mm to 6.4 mm and the hole roundness at the range of 0.005 mm to 0.01 mm, higher hole diameter and hole roundness will provide higher maximum bearing strength. The range of surface roughness is quite small at 10 [mu]m/rev and 250 [mu]m/rev, and the largest range of surface roughness occurs at 350 [mu]m/rev for both types of tools. The delamination occurs only at the 350 and 500 [mu]m/rev feed rate and for uncoated carbide drilled holes only.
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Details
- Title
- Effects of drilling parameters and hole quality on pinned joint bearing performance of carbon fiber reinforced plastics laminate
- Creators
- Ziang Zhou
- Contributors
- Dae-Wook Kim (Advisor) - Washington State University, School of Engineering and Computer Science (VANC)
- Awarding Institution
- Washington State University
- Academic Unit
- School of Engineering and Computer Science (VANC)
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Identifiers
- 99900890794901842
- Language
- English
- Resource Type
- Thesis