Mechanical Behavior of Carbon and Glass Fiber Reinforced Composite Materials Under Varying Loading Rates

Fiber reinforced composites;Quasi static tensile testing;High strain rate testing;Open hole tensile testing;Digital image correlation;Mechanical engineering;Mechanical Engineering, College of Engineering & Computer Science

Pariti, Venkata Naga Prakash MallikJayaraman, Tanjore V. ;

University of Michigan

关键词: Fiber reinforced composites;    Quasi static tensile testing;    High strain rate testing;    Open hole tensile testing;    Digital image correlation;    Mechanical engineering;    Mechanical Engineering, College of Engineering & Computer Science;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/140761/VenkataPrakashPariti_FinalThesis_V2.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Composite materials reinforced by carbon and/or glass fibers offer a set of attractive properties such as high strength and stiffness, excellent corrosion resistance and improved fatigue properties, making them suitable for a variety of structural applications. The use of these composites is becoming critical for applications where the structures may be subjected to dynamic loading conditions. Therefore, it is important to investigate the effect of strain rate on the mechanical response of these lightweight composite materials when subjected to dynamic loading conditions. In this thesis, woven carbon and glass fiber reinforced composites based on an epoxy matrix were tested under tensile loading using a screw-driven Instron universal testing machine, a high-speed servo-hydraulic MTS test system and an in-house pneumatic system in order to achieve strainrates of 0.0025 s-1, 0.25 s-1, 10 s-1,100 s-1, 500s-1 and 1000s-1. Furthermore, to investigate the mechanical behavior of these materials under such loading conditions a high-speed DIC (Digital Image Correlation) system was also used consisting of two high-speed cameras capable of recording over 200,000 frames per second. Experimental results revealed that these materials maintained their high strength properties even under high strain rates and could be the material of choice for lightweight structures that may be subjected to dynamic loading conditions. Furthermore, the high speed DIC system revealed local and global strain distributions within the woven composites highlighting their failure mechanisms.