碩士 / 大葉大學 / 醫療器材設計與材料碩士學位學程 / 106 / With the development trend of ship design and manufacturing, the opportunities for composite materials and metals will become more and more extensive under the requirements of light weight and disappearance. The sea environment is very harsh, with harsh conditions such as salt, fog and high temperature, which will have serious corrosion effects on the material. In particular, the "composite + steel" joint portion is the region with the fastest corrosion rate and the most severe tidal region in the marine environment.
This research project includes: natural aging, and accelerated aging tests for salt spray, temperature and humidity resistance and high temperature oxidation. The accelerated aging test time is planned to be 0 hr~30 days (the salt spray test is equivalent to the number of days of natural exposure in the next year); if the corrosion of the joint is not severe after macroscopic observation, the tensile properties of different accelerated aging times are compared. The results showed that the glued test piece (joined structural adhesive: 1152-PA) and the "glued + bolt" test piece began to crack on the surface of the structural adhesive after 48 hours of various accelerated aging tests, and the glue-steel interface lost. Most of the bonding power. In particular, the interface of the salt spray test specimen has been left in the liquid and a partial oxidation phenomenon on the steel surface has been found, which is caused by the infiltration of the corrosive liquid along the interface. Moreover, after various accelerated aging tests, the tensile test of the "glued + bolt" specimens showed that the bolt was the final strength, and the difference in tensile failure strength was probably in the degree of hydrolysis of the composite.
In order to improve the defects in accelerated aging, such as: adding a layer of interface glue (Araldite AV138 M-1 + HV998) between the structural adhesive and the metal joint, improving the protective treatment of the joint test piece, etc., and based on the experimental results The evaluation method is carried out: natural aging and salt spray, accelerated temperature and humidity accelerated aging test, as the basis for the lightweight design of the ship superstructure with FRP composite material, the maintenance period and the whole life period assessment during service.
At the same time, in order to achieve good surface protection ability, this study refers to the US military specification MIL-PRF-23236 as the accelerated aging test protection for the purpose of increasing the anti-aging and joint surface protection, and solving the corrosion of the joint surface by corrosive moisture. Phenomenon and structural rubber are cracked after aging, and it is desirable to increase the tensile (pressing) strength of the test piece.
The shear tensile test of the test piece without the surface of the test piece found that the overall joint ability was greatly improved by 60% after the addition of the interface glue, and most of the interface adhesive remained on the metal damage surface, indicating that the improvement effect was good. Moreover, the breaking method is to cut the bolt from the interface of the metal plate, and the joint strength is determined by the material strength of the bolt, and the hardening strength of the structural rubber is also quite supported, and the composite material is not damaged. The surface-treated test piece has a 86% better joint ability than the unsurfaced test piece, and maintains a good joint ability after prolonged accelerated aging, effectively improving the penetration of the joint surface by corrosive moisture. The good protection of the structural adhesive enables the structural adhesive to produce a post-cure phenomenon that enhances the overall tensile (pressing) strength.
| Identifer | oai:union.ndltd.org:TW/106DYU00747010 |
| Date | January 2018 |
| Creators | WANG, HSIU-CHE, 王秀哲 |
| Contributors | LI,YI GANG, 李義剛 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 115 |
Page generated in 0.0016 seconds