碩士 / 國立中央大學 / 機械工程研究所 / 82 / Pullout test has been widely utilizing in evaluating desi- ng
parameters of screws. This is due to its simplicity in the
experimental procedure. However, simple test creats some diff-
icult problems. For example, no discussions has been made in
the following topics: (1) effect of insertion position and di-
rection, (2) effect of pullout direction, (3) effect of varia-
riation of cancellous bone structures. Insertion position and
direction are relative to the geometric orientation of cancel-
lous structures. Pullout direction can also contribute to pul-
lout strength. Thinking differently, in this study, we use two
kinds of trabecular structures : isotropic rod-type from bovine
femoral condyle and plate-rod type structure from bovine spine
vetebral body C2~C6, to check how this structural variation
affecting the maximum pullout force in the pullout test.
Finally, finite element modeling for pullout test is important
based on several points: (1) how accurate can be obtained, (2)
local deformation pattern around threads, (3) convergence cha-
racteristics. In the finite element analysis the strain energy
density criterion will be used to define failure condition in
the pullout simulation.
| Identifer | oai:union.ndltd.org:TW/082NCU00489059 |
| Date | January 1994 |
| Creators | Eddy Gong, 龔耀春 |
| Contributors | Wai-Hee Lo, Hang-Chung Kao, 鄔蜀威,郭榮富 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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