Assumption tests regarding the 'narrow' rectangles dimensions of the open thin wall sections

4th ModTech International Conference - Modern Technologies in Industrial Engineering

Oanta, E.^1,2 ; Panait, C.^1 ; Sabau, A.^1 ; Barhalescu, M.^1 ; Dascalescu, A.E.^2

Constanta Maritime University, Faculty of Naval Electro-Mechanics, 104 Mircea cel Batran Street, Constanta

900663, Romania^1

Politechnica University of Bucharest, Faculty of Power Engineering, 313 Splaiul Independentei, Sector 6, Bucharest

060042, Romania^2

关键词: Analytic method;    Analytic models;    Open section;    Rectangular section;    Shape sections;    Thin wall sections;    Thin walls;    Twisting moment;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/145/8/082010/pdf
DOI  :  10.1088/1757-899X/145/8/082010

来源: IOP

【 摘 要 】

Computer based analytic models that use the strength of materials theory are inheriting the accuracy given by the basic simplifying hypotheses. The according assumptions were rationally conceived hundreds of years ago in an age when there was no computing instrument, therefore the minimization of the necessary volume of calculi was an important requirement. An initial study was an attempt to evaluate how 'thin' may be the walls of an open section in order to have accurate results using the analytic calculus method. In this initial study there was compared the calculus of the rectangular sections loaded by twisting moments vs. a narrow section under the same load. Being compared analytic methods applied for a simple shape section, a more thorough study was required. In this way, we consider a thin wall open section loaded by a twisting moment, section which is discretized in 'narrow' rectangles. The ratio of the sides of the 'narrow' rectangles is the variable of the study. We compare the results of the finite element analysis to the results of the analytic method. The conclusions are important for the development of computer based analytic models which use parametrized sections for which different sets of calculus relations may be used.