Optimal design of reinforced cylindrical shells with corrosive wear taken into account

1988 ◽  
Vol 30 (3) ◽  
pp. 458-461 ◽  
Author(s):  
T. M. Krivoruchko ◽  
Yu. M. Pochtman
Keyword(s):  
Optimal Design ◽  
Cylindrical Shells ◽  
Corrosive Wear

Optimal design of ring stiffened cylindrical shells using multiple stiffener sizes

AIAA Journal ◽  
1980 ◽  
Vol 18 (8) ◽  
pp. 1020-1022 ◽  
Author(s):  
Michael Pappas ◽  
Jacob Moradi
Keyword(s):  
Optimal Design ◽  
Cylindrical Shells ◽  
Stiffened Cylindrical Shells

scholarly journals Optimal Design of Single-Layered Reinforced Cylindrical Shells

2021 ◽  
Vol 24 (1) ◽  
pp. 58-64
Author(s):  
Heorhii V. Filatov ◽  
Keyword(s):  
Optimal Design ◽  
Numerical Experiment ◽  
Wall Thickness ◽  
Random Search ◽  
Cylindrical Shells ◽  
Compressive Load ◽  
Mathematical Programming Problem ◽  
Feasible Region ◽  
Shell Weight ◽  
Longitudinal Stiffeners

This paper discusses the application of the random search method for the optimal design of single-layered reinforced cylindrical shells operating in a neutral environment. When setting a mathematical programming problem, the minimum shell weight is considered as an objective function. The critical stresses are determined according to the linear theory in the elastic region of the material. As the constraints imposed on the feasible region, the constraints on the strength, general buckling and partial buckling of a shell are accepted. The aim of this paper is to study the weight efficiency of various types of shell reinforcements and the influence of an optimum-weight shell on the parameters of an axially-compressed one. A numerical experiment was carried out. Dependencies of shell weight, wall thickness, and reinforcement parameters on the magnitude of a compressive load were investigated for shells with different types of reinforcement. As a result of the numerical experiment performed, it was found that with an increase in compressive load magnitude, there is a tendency to an increase in the wall thickness of an optimal shell, with an increase in the thickness of longitudinal stiffeners (stringers) and a slight decrease in the number of ribs. In addition, it should be noted that the general case of buckling and the first special one turned out to be decisive in choosing optimal shell parameters.

scholarly journals Design of circular flexible plates under of corrosion wear

2021 ◽  
Vol 263 ◽  
pp. 03007
Author(s):  
Vladimir Mavzovin ◽  
Igor Ovchinnikov
Keyword(s):  
Fatigue Life ◽  
Optimal Design ◽  
Service Life ◽  
Quadratic Programming ◽  
Sequential Quadratic Programming ◽  
Minimax Problem ◽  
Corrosive Wear ◽  
Optimal Thickness ◽  
Programming Technique ◽  
Metal Structures

The problems of optimal design of metal structures are usually formulated as the problem of finding such values of the selected parameters of structures that provide the smallest (or largest) value of the selected optimality criterion in the area of admissible design solutions. In most works on the optimization of metal structures, parametric problems are considered, limited by the preliminary assignment of a constructive form with the possibility of changing its parameters. To solve these problems, both deterministic and probabilistic optimization models can be used. A deterministic problem of optimal design of flexible round metal plates exposed to the combined action of a load and an aggressive environment causing corrosive wear of one of the plate surfaces is considered. A feature of the statement is that it takes into account the effect of the stressed state of the plates on the kinetics of their corrosive wear. Due to the insufficient efficiency of random search methods, the sequential quadratic programming technique is used. Two formulations of the optimal design problem are formulated, which are reduced to the minimax problem. 8 optimization projects were considered, their comparative analysis was carried out. It is shown that the realization of the found optimal thickness profiles leads either to a significant decrease in the stress level at the end of the plate’s service life, or to a significant increase in the service life. Calculation results show that maximum fatigue life designs are equal at end-of-life, and the maximum increase in fatigue life for hard- pinned inserts along the contour is 59%. As a result of the study, it was found that the problems of optimal design of flexible round plates under conditions of corrosive wear (the rate of which depends on the level of stresses in the plates), presented in the form of a minimax problem, can be effectively solved using the sequential quadratic programming technique, and the study of time evolution is intense -strain state can be carried out using a combination of the mesh method and the Adams method. Realization of the found optimal thickness profiles leads either to a significant decrease in the stress level at the end of the plate’s service life, or to a significant increase in the service life.

Optimal design of cylindrical shells

1991 ◽  
Vol 3 (4) ◽  
pp. 252-256 ◽  
Author(s):  
H. R. Yu ◽  
B. Liang ◽  
L. Li
Keyword(s):  
Optimal Design ◽  
Cylindrical Shells

Supporting power and optimal design of rigid plastic cylindrical shells

1984 ◽  
Vol 20 (5) ◽  
pp. 433-438
Author(s):  
A. S. Dekhtyar' ◽  
A. O. Rasskazov ◽  
V. S. Rublev
Keyword(s):  
Optimal Design ◽  
Cylindrical Shells ◽  
Rigid Plastic
Sign in / Sign up

Export Citation Format

Share Document