کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
308746 513564 2015 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inflation and bending of an orthotropic inflatable beam
ترجمه فارسی عنوان
تورم و خمش یک پرتو تورم پرتو ارتوتروپیک
کلمات کلیدی
پرتو تورم لوله غشایی، ارتوتروپی، تورم، خم شدن
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


• The paper investigates the inflation and the bending of a cylindrical inflatable beam made of an orthotropic membrane, with the orthotropy directions parallel to the beam axis and the beam circumference.
• The analytical solution for the inflation stage is given.
• The bending of the beam is modeled according to the Timoshenko kinematics. The constitutive law used in the bending stage – which is not the same as in the natural state – is given.
• The analytical solution for the bending of a cantilever inflatable beam is obtained as an example and compared with numerical finite element results.

An inflatable beam is an airtight structure made of a soft technical fabric and subjected to an internal pressure which gives it a final cylindrical shape, a pre-stress in the membrane and a bearing capacity. Against all appearances, it is not a standard beam and it requires a specific formulation in order to take account of the internal pressure which plays a key role in its mechanical response.This work deals with inflatable beams made of orthotropic materials. The first part of the paper is concerned with the inflation of the membrane tube, an important stage which is often neglected so far in the literature. As preliminaries of the bending problem studied in the next part of the paper, the constitutive law related to the inflated state of the tube – not the natural state – is investigated. It will be shown that the constitutive law related to the inflated pre-stressed state is not the same as the constitutive law related to the natural state. Expressions of the material coefficients involved in the former constitutive law will be established from the material coefficients defined on the natural reference configuration which are the only ones supposed to be known. The second part of the paper deals with the bending of the inflatable beam. The Timoshenko beam kinematics will be chosen because of the significant shear effect in the tube wall and the problem will be formulated in finite deformations in order to account for all the nonlinear effects, in particular the action due to the internal pressure which is a follower load. The nonlinear system of equations obtained will then be linearized around the pre-stressed configuration and will result in a more tractable linear system. The proposed formulation allows a comprehensive study of the influence of the internal pressure on the geometry and material properties of orthotropic inflatable beams. The analytical results will be compared with numerical results obtained from a nonlinear membrane finite element code.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin-Walled Structures - Volume 88, March 2015, Pages 129–144
نویسندگان
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