The Influence of Cure Time Restrictions on Minimum-Weight Design of Double-Layer SMC Panels

1979 ◽  
Vol 101 (1) ◽  
pp. 22-26 ◽  
Author(s):  
M. R. Barone ◽  
D. A. Caulk ◽  
D. C. Chang
Keyword(s):  
Double Layer ◽  
Minimum Weight ◽  
High Volume ◽  
Manufacturing Cost ◽  
Minimum Weight Design ◽  
Molding Compound ◽  
Sheet Molding Compound ◽  
Time Restrictions ◽  
Cure Time ◽  
Weight Design

In this paper, minimum-weight design of double-layer panels made from sheet molding compound is related to cure time—a critical indicator of manufacturing cost. This is done by incorporating cure time restrictions in the optimization analysis. Depending on the design constraints imposed on the panel, the least-weight design can require cure times which are unacceptably long for economical high volume production. Nevertheless, we show that cure time can be brought within acceptable bounds by design changes that incur only modest increases in weight.

Influences of Uncertainties on Mechanical Behavior of a Double-Layer Space Truss

1992 ◽  
Vol 7 (3) ◽  
pp. 223-235 ◽  
Author(s):  
Akira Wada ◽  
Zhu Wang
Keyword(s):  
Mechanical Behavior ◽  
Double Layer ◽  
Human Error ◽  
Minimum Weight ◽  
Initial Imperfection ◽  
Minimum Weight Design ◽  
Space Truss ◽  
The Monte Carlo Method ◽  
Weight Design ◽  
Statistical Studies

A space truss, as all other structures, is constantly subject to various types of uncertainties. For the purpose of estimating, and furthermore, ensuring the safety of a space truss, it is important to investigate its mechanical behavior with consideration of the influences of uncertainties. A 6 × 6 square-plan, double-layer space truss is designed in accordance with minimum weight design concept and used as an example to study. A computer program is written to analyze the truss structure, with an ability to simulate member buckling. The Monte Carlo method is applied for statistical studies with trial number of each study set to 100. The variation of member strength, initial imperfection of member length are chosen for component uncertainties, and the error in assembly process is chosen for human error. The mechanical behavior of the space truss influenced by these uncertainties is studied. A comparison between the influences of the component's uncertainties originating in human error, is made to determine where the most critical uncertainties lie.

Minimum Weight Design of Ring Stiffened Cylinders Under External Pressure

1961 ◽  
Vol 5 (03) ◽  
pp. 44-49 ◽  
Author(s):  
George Gerard
Keyword(s):  
Yield Strength ◽  
Minimum Weight ◽  
External Pressure ◽  
Compressive Yield Strength ◽  
Minimum Weight Design ◽  
Weight Design

Minimum weight analyses for unstiffened and ring-stiffened cylinders under external pressure are presented for designs based on stability and compressive yield-strength considerations. The results for both types of cylinders are compared in terms of a common set of parameters to establish the efficiency of the stiffening system. The results are then compared on a somewhat different basis to establish the relative efficiencies of various classes of materials. Finally, certain conclusions are drawn of particular pertinence to deep submersibles.

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