1. 제 목 : Assessment of Durability of Carbon/Epoxy Composite Materials after Exposure to Elevated Temperatures and Immersion in Seawater for Navy Vessel Applications

2. 연 사 : 홍순국 교수 (해군 사관학교 기계조선공학부)

3. 일 시 : 2010년 10월 8일 (금) 13:30 -14:30

4. 장 소 : 301동 1512-2호

5. 내 용 :

Carbon Fiber-Reinforced Polymer (CFRP) composites with epoxy matrices offer many advantages over conventional materials in terms of high strength-to-weight and high stiffness-to-weight ratios, design flexibility, corrosion resistance, and electromagnetic shielding for naval vessels in marine environments. However, the risk of fire and related structural degradation represent a challenge to the structural assessment of high performance composite structures. The accurate assessment of the deterioration and degradation of a composite structure subjected to elevated temperatures is vital in the planning for maintenance of mission critical components.
In this research, carbon/epoxy composite materials have been thermally aged at nine (9) different temperatures for up to 72 hours of ageing time. In order to determine the residual mechanical properties of the specimens exposed to elevated temperatures, tensile, flexure, off-axis shear, and short beam shear tests were conducted in accordance with ASTM test procedures. In addition, the viscoelastic behavior and dynamic properties of these composites at varying ageing times and temperatures were found using Dynamic Mechanical Thermal Analysis (DMTA) and Differential Scanning Calorimetry (DSC). ThermoGravimetric Analysis (TGA) was performed to analyze the characteristics of thermal decomposition and Scanning Electron Microscopy (SEM) images were taken to investigate failure mechanisms such as interfacial debonding, delamination, and fiber fracture.

6. 연사약력 :
- Assistant Professor: Naval architecture and Mechanical Engineering, Naval Academy(Present)
<Educations >
Ph.D.: Mechanical Engineering, University of California, San Diego (2010)
M.S. : Mechanical Engineering, Seoul National University (2005)
B.S. : Mechanical Engineering, Seoul National University (1997)
B.S. : Mechanical Engineering, Naval Academy (1994)

7. 문 의 : 기계항공공학부 김민수 교수 (880-8362, minskim@snu.ac.kr)