عنوان

Weight and cost multi-objective optimization of hybrid composite sandwich structures

Number

TL49207

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Weight and cost multi-objective optimization of hybrid composite sandwich structures

General Material Designation

[Thesis]

First Statement of Responsibility

Adel Issa Salem

Subsequent Statement of Responsibility

Denoldson, Steven

Name of Publisher, Distributor, etc.

University of Dayton

Date of Publication, Distribution, etc.

2016

Specific Material Designation and Extent of Item

198

Text of Note

Committee members: Hoffman, Rebecca; Islam, Muhammed; Whitney, Thomas

Text of Note

Place of publication: United States, Ann Arbor; ISBN=978-1-369-51838-2

Dissertation or thesis details and type of degree

Dr.Ph.

Discipline of degree

Mechanical Engineering

Body granting the degree

University of Dayton

Text preceding or following the note

2016

Text of Note

Producing a light structure with relatively affordable cost without sacrificing strength has always been a challenging task for designers. Using a hybrid material approach provides an expanded methodology to combine materials having different costs and properties (for example, combining fibers with high cost and high stiffness such as carbon with low cost, less stiffness fibers such as glass). Hence, a comparative approach is useful for the evaluation of design solutions in terms of weight and cost. In this study, a methodology for a combined weight and cost optimization for sandwich plates with hybrid composite facesheets and foam core is presented. The weight and cost of the hybrid sandwich plates considered are the objective functions subject to required equality constraints based on the bending and torsional stiffnesses. The hybrid sandwich plates considered consisted of thin hybrid composite facesheets, symmetric with respect to the mid-plane of the sandwich plates. The facesheets considered consisted of carbon/epoxy and E-glass/epoxy fiber reinforced polymer. The layup of the fibers of the facesheets was restricted to some discrete sets of plies layup having orientation angles of 0, ±45 and 90. Two different densities (with two difference costs) of polyisocyanurate closed-cell foam core were studied. Single and multi-objective optimization techniques were performed to obtain the optimum design values. An Interior-Point Algorithm was used to perform the single objective optimization. For the multi-objective cases, both the weight and the cost of the hybrid sandwich plate were minimized simultaneously. The normalized normal constraint method with Pareto filter was used to generate the Pareto frontier trade-off curve. The Pareto trade-off curve was constructed by optimizing a sequence of combining weight and cost objective functions, while every function was minimized using the Active Set Algorithm. Only the cost of the fibers and the core materials were considered in this study. A key finding is that design curves can be created showing that hybrid solutions can be preferred when both cost and weight are considered simultaneously.

Civil engineering; Mechanical engineering

Subject Term

Applied sciences;Cost and weight;Hybrid;Multi-objective optimization;Normalized normal constraint method;Sandwich structure

Shaheem, Samineh

Denoldson, Steven

Subdivision

Mechanical Engineering

University of Dayton

Call Number

1868806149; 10307260

Electronic name

p

[Thesis]

276903

a

Y