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Analysis Of Laminated Composites: A Web Based Computer Program Based On Classical Lamination Theory

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2005 Annual Conference


Portland, Oregon

Publication Date

June 12, 2005

Start Date

June 12, 2005

End Date

June 15, 2005



Conference Session

Undergraduate Aerospace Labs/Design II

Page Count


Page Numbers

10.201.1 - 10.201.10

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Paper Authors

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Francisco Aguiniga

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Hector Estrada

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NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Analysis of Laminated Composites: A Web-based Computer Program Based on Classical Lamination Theory

*Dr. H. Estrada, P. E. (corresponding author) and *Dr. F. Aguiniga

*Civil Engineering Program Texas A&M University – Kingsville MSC 194 Kingsville, Texas 78363


This paper presents the description of a web-based computer program for the analysis of laminated composites using Classical Lamination Theory. The program was developed using an object-oriented programming methodology, Java, and runs from any web page. The program is intended for educational purposes, but it can also be used in industry. It is currently used in a mechanics of composites course taught at Texas A&M University-Kingsville. The response from the students after using the program has been very positive and encouraging. The students primarily complement the program’s interface, which is very user-friendly. Furthermore, the program is practical and can be used to compute the stresses and strains in any laminated composites. The main objective of the paper is to present the program to other potential users in academia and industry.


In order to design a structure (after the design loads have been determined) it is necessary to conduct an analysis to find the internal forces in each structural element, which are then used to determine the strains and stresses. These stresses are then used to assess the capacity of the system. This process is straightforward for structures composed of isotropic materials; however, for structures composed of fiber reinforced plastic materials (composites), the process can be much more involved, particularly the step where the internal forces are converted to strains and stresses. A number of theories have been developed to convert internal forces to strains and stresses; the most practical of which is Classical Lamination Theory 1,2 - from hereon referred to as CLT. The computer program described in this paper calculates the stresses at a point in a composite structure given the internal forces (axial and shear forces and bending moments) and the material properties. The program is based on CLT.

The CLT analysis to determine strains and stresses is complex, involving tedious calculations. Students in Engineering Mechanics of Fiber Composites at Texas A&M University-Kingsville

Proceedings of the 2005 American Society for Engineering Education Annual Conference & Exposition Copyright © 2005, American Society for Engineering Education

Aguiniga, F., & Estrada, H. (2005, June), Analysis Of Laminated Composites: A Web Based Computer Program Based On Classical Lamination Theory Paper presented at 2005 Annual Conference, Portland, Oregon.

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