What is it about?
Non-conventional straight fiber laminates with any fiber orientation angle have demonstrated a higher load carrying capability than conventional 0, +45, -45, and 90 degree angles. In this paper, a two-step approach is used to optimize cylindrical shells. First, the optimum lamination parameters are found, then the fiber orientation angles are retrieved using a genetic algorithm subjected to industry design guidelines to provide robustness.
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Why is it important?
Optimization of non-conventional laminates is not a trivial task. By using lamination parameters, the designer tackled the issues of complexity and non-convexity of the problem. The two-step approach demonstrates the efficiency of the optimization in terms of the stiffness matrices of the laminate to attain the global optimum design. Demonstrating the improvements obtained by using non-conventional laminates compared to conventional ones can be a first step towards certification.
Perspectives
An important aspect in this paper is the global optimization of non-conventional laminates. The integration of the industry design guidelines in the design process is an important aspect in each design problem to ensure feasibility and robustness of a designed part. Including more design guidelines further restricts the design space available, and it demonstrates even further the advantage of using non-conventional laminates over conventional ones.
Mazen Albazzan
University of South Carolina System
Read the Original
This page is a summary of: Optimization of Cylinders with Holes under Bending using Nonconventional Laminates, January 2018, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2018-1377.
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