Journal Published Online: 08 May 2019
Volume 49, Issue 1

Prediction of Dynamic Parameters of Variable Diameter Shell Composite Structure via 2-D Subscale Modeling

CODEN: JTEVAB

Abstract

Prediction of possible vibration responses for a composite structure via subscale modeling is discussed in this article. The analytical correlations for three-dimensional (3-D) subscale modeling for metallic structures cannot be directly used for composite structures. In such structures, change in thickness can alter the mechanical properties of a composite structure and its prototype; therefore, vibration characteristics can only be predicted via two-dimensional (2-D) subscale modeling. For this purpose, the 3-D analytical relations are customized for 2-D subscale modeling along with an additional parameter, i.e., rigidity factor (RF), avoiding violation of dimensional consistency of the structure. They are also validated experimentally for variable diameter glass fiber shell composite structure. Three different approaches were used to develop these empirical correlations, which were then compared to determine the best one, closely matching the experimental results. It is found that empirical relations obtained for the 2-D subscaling technique produces better results against their counterpart 3-D subscale correlations. The dynamic behavior of shell structure can be predicted within a 10 % error band. Moreover, it was found that the research can be applied to all the composite shell structures that are difficult to scale in the third dimension.

Author Information

Zai, Behzad Ahmed
Pakistan Navy Engineering College, National University of Science and Technology, Pakistan - Mechanical Engineering, Karachi, Pakistan
Sami, Saad
Structural Design and Development Directorate, Pakistan Space & Upper Atmosphere Research Commission (SUPARCO), Karachi, Pakistan
Amir Khan, M.
Structural Design and Development Directorate, Pakistan Space & Upper Atmosphere Research Commission (SUPARCO), Karachi, Pakistan
Anwer, Azeem
Creative Dynamics Engineering, Karachi, Pakistan
Ur-Rehman, Tanzeel
Structural Design and Development Directorate, Pakistan Space & Upper Atmosphere Research Commission (SUPARCO), Karachi, Pakistan
Pages: 11
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Details
Stock #: JTE20180521
ISSN: 0090-3973
DOI: 10.1520/JTE20180521