naa a22 4500 510823866 CHVBK 20180411083547.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s12541-013-0187-7 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0187-7 Cho Hee-Keun Department of Mechanical Engineering Education, Andong National University, 1375 Gyeongdong-ro, Andong-si, 760-749, Gyeongsangbuk-do, South Korea aut Design optimization of laminated composite plates with static and dynamic considerations in hygrothermal environments [Elektronische Daten] [Hee-Keun Cho] Motivated by needs such as those in the aerospace industry, this paper develops and demonstrates a method for optimizing laminated composite shell components considering the natural frequency, damping and deflection subjected to a concentrated load on the center of the plate in hygrothermal environments by manipulating individual ply angles and thicknesses. Optimization is performed by synergizing an FEA with a gradient-based modified feasible direction optimization algorithm. The objective is to minimize the weight of the plates within the given design space via the constraint of the first natural frequency, dampings of the first vibration modes and deflections caused by the applied hygro-thermo-mechanical loads. Illustrative applications involve six-ply symmetric rectangular laminated panels simply supported along four edges, although the method is applicable to more complicated laminates, geometries and boundary conditions. The panel geometry is discretized into specially-developed, 3D-degenerated eight-node shell isoparametric layered composite elements. Through a numerical example, it is shown that hygro-thermal effects play an important role in the optimal design of laminated composites. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Laminate nationallicence Composite nationallicence Optimization nationallicence FEA nationallicence Hygrothermal nationallicence er, es, et : shell element directional unit vectors nationallicence N k : shape function nationallicence V n k : normal vector to the shell mid-surface nationallicence [ C sh ] : shell element material stiffness matrix nationallicence [ T sh ] : shell element transformation matrix nationallicence α xx : x-direction thermal expansion coefficient nationallicence β xx : x-direction hygro coefficient nationallicence R I : thermally induced equivalent nodal force nationallicence ɛ th : thermal strain nationallicence ɛ hy : hygro strain nationallicence Ψ : damping capacity nationallicence U e : total strain energy nationallicence [ K s ] : static stiffness matrix nationallicence [ K th ] : temperature stiffness matrix nationallicence [ K hy ] : moisture stiffness matrix nationallicence [ B ] : strain-displacement matrix nationallicence [ M ] : mass matrix nationallicence International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/8(2013-08-01), 1387-1394 2234-7593 14:8<1387 2013 14 12541 https://doi.org/10.1007/s12541-013-0187-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0187-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Cho Hee-Keun Department of Mechanical Engineering Education, Andong National University, 1375 Gyeongdong-ro, Andong-si, 760-749, Gyeongsangbuk-do, South Korea aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Springer Berlin Heidelberg 14/8(2013-08-01), 1387-1394 2234-7593 14:8<1387 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer