Optimum design of composite laminates for frequency constraints

2007 ◽  
Vol 81 (4) ◽  
pp. 587-597 ◽  
Author(s):  
Behrooz Farshi ◽  
Reza Rabiei
Keyword(s):  
Optimum Design ◽  
Composite Laminates ◽  
Frequency Constraints

Probabilistic Optimum Design of Composite Laminates

1998 ◽  
Vol 32 (1) ◽  
pp. 68-82 ◽  
Author(s):  
S. Mahadevan ◽  
X. Liu
Keyword(s):  
Objective Function ◽  
Optimum Design ◽  
Composite Laminates ◽  
Plate Theory ◽  
Limit State ◽  
Strength Criterion ◽  
System Level ◽  
State Function ◽  
Practical Procedure ◽  
Reliability Method

This paper proposes a procedure for the optimum design of composite laminates under probabilistic considerations. The problem is formulated to consider the minimization of laminate weight as the objective function and the reliability requirements as the constraints. Both system-level and element-level reliabilities are considered. The first-order reliability method (FORM) is used to estimate the reliability of each ply group, and system reliability is computed based on series or parallel system assumptions. The Tsai-Wu strength criterion is adopted to derive the limit state function of individual ply groups in the laminate. The gradient and sensitivity information of the objective function and the constraints with respect to the design variables are obtained by using sensitivity analysis based on the composite plate theory. Thus the proposed procedure brings together modern concepts of reliability analysis, composite laminate behavior and nonlinear optimization to develop a rational and practical procedure for the optimum design of composite laminates. Numerical examples are presented to demonstrate the effectiveness of the proposed method.

Optimum design of composite laminates for minimum thickness

2008 ◽  
Vol 86 (21-22) ◽  
pp. 1974-1982 ◽  
Author(s):  
Mustafa Akbulut ◽  
Fazil O. Sonmez
Keyword(s):  
Optimum Design ◽  
Composite Laminates ◽  
Minimum Thickness
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