A finite element method is employed to numerically evaluate the stiffness and energy absorption properties of an architecturally hybrid composite material consisting of unidirectional and random glass fiber layers. An ls-dyna finite element model of a composite hollow square tube is developed in which the position of the random fiber layers varies through the thickness. The assessment of the stiffness and energy absorption is performed via three-point impact and longitudinal crash tests at two speeds, 15.6 m/s (35 mph) and 29.0 m/s (65 mph), and five strain rates, = 0.1 s−1, 1 s−1, 10 s−1, 20 s−1, and 40 s−1. It is suggested that strategic positioning of the random fiber microstructural architecture into the hybrid composite increases its specific absorption energy and, therefore, enhances its crashworthiness. The simulation data indicate that the composite structure with outer layers of unidirectional lamina followed by random fiber layers is the stiffest due to the considerable superior specific energy absorption of the random fiber micro-architecture. Moreover, it is illustrated that the specific energy absorption increases with the increased ratio of impact contact area over cross-section area. Of all the parameters tested the thickness of the unidirectional laminate on the specific energy absorption does not appear to have a significant effect at the studied thickness ratios.
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October 2011
Research Papers
Numerical Evaluation of Stiffness and Energy Absorption of a Hybrid Unidirectional/Random Glass Fiber Composite
Wensong Yang,
Wensong Yang
Graduate Student
Mechanical and Aerospace Engineering Rutgers,
The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854
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Assimina A. Pelegri
Assimina A. Pelegri
Professor
Mechanical and Aerospace Engineering Rutgers,
e-mail: pelegri@jove.rutgers.ed
The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854
Search for other works by this author on:
Wensong Yang
Graduate Student
Mechanical and Aerospace Engineering Rutgers,
The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854
Assimina A. Pelegri
Professor
Mechanical and Aerospace Engineering Rutgers,
The State University of New Jersey
, 98 Brett Road, Piscataway, NJ 08854e-mail: pelegri@jove.rutgers.ed
J. Eng. Mater. Technol. Oct 2011, 133(4): 041018 (8 pages)
Published Online: October 27, 2011
Article history
Received:
March 11, 2011
Revised:
July 13, 2011
Online:
October 27, 2011
Published:
October 27, 2011
Citation
Yang, W., and Pelegri, A. A. (October 27, 2011). "Numerical Evaluation of Stiffness and Energy Absorption of a Hybrid Unidirectional/Random Glass Fiber Composite." ASME. J. Eng. Mater. Technol. October 2011; 133(4): 041018. https://doi.org/10.1115/1.4005253
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