Effect of diffusion on composite material properties

• Main Author: Yeoh, Wu Lieh
• Other Authors: Seah Leong Keey
• Format: Final Year Project
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
• Online Access: http://hdl.handle.net/10356/60914
• Institution: Nanyang Technological University

The need for a material with better enhancement has always been there ever since the advances of technology in the marine-time applications. In the past, most of the materials that were used in marine-time applications were super-alloys. Steel is the most commonly used material as it is known for its strength. As of now, deep oil harnessing is much deeper as compare to the past and this pushed the limit of steel to its limit. As the deepness for harnessing increases, the anchors can no longer undergo the natural weight of the pipeline and it result in additional loading within the structure. Thus, this will lead to a burst in pipeline as seen from majority of the oil-spills. Therefore, there is a high demand for new materials to substitute steel with a lighter weight and at the same time providing a stronger mechanical strength. This material is the fiber reinforced composite. In this project, the main focus will be on the tensile and fatigue testing of the wet and dry sample of Bismaleimide. This is to find out the properties of the Bismaleimide such as the maximum stress, the yield point, young modules of Bismaleimide. This project also includes the comparing of both the wet and dry Bismaleimide sample to understand its mechanical properties. Further on, fatigue test will be done on different stress ratio and use to determine the failure cycle of each ratio. If possible, a forecast could also be done to find out about other ratio’s failure cycle Bismaleimide samples undergo the testing in a room temperature of 25 degree Celsius with the same MTS machine in the aerospace laboratory. Hydraulic systems for the MTS machine were shared in the lab. A total of 52 dry Bismaleimide samples were used to undergo fatigue testing. From the tensile testing, it shows that the dry sample’s yield point and maximum stress is much higher as compare to the wet sample. However, the wet Bismaleimide sample seems to have a higher young modulus as compare to the dry Bismaleimide sample.