CREEP OF INHOMOGENEOUS POLYMER CYLINDRICAL SHELL DURING HEATING

2021 ◽  
pp. 33-39
Author(s):  
V.I. Andreev ◽  
◽  
S.A. Sereda ◽  
Keyword(s):  
Differential Equation ◽  
Cylindrical Shell ◽  
Temperature Field ◽  
Stress State ◽  
Nonlinear Problem ◽  
Plane Deformation ◽  
Elastic Solution ◽  
Layer By Layer ◽  
Layer Method ◽  
Significant Difference

Abstract. The article deals with the problem of creep of a polymer thick-walled cylindrical shell under the action of an uneven temperature field. The calculation is based on the nonlinear Maxwell – Gurevich equation, which is widely used in the calculations of polymer structures. To solve a quasi-stationary nonlinear problem, a "layer-by-layer" method is used, where a layer means a certain time of the process. Such methods for solving creep problems are also called step, sequential loading, incremental, etc. The problem is solved in an axisymmetric formulation under conditions of plane deformation. The use of the Maxwell – Gurevich differential equation allows solving rheology problems when exposed to a timevarying temperature field. The change in the stress state with time and its significant difference from the elastic solution are shown.

Stress State of a Thick-Walled Cylindrical Shell under the Combined Action of Radiation and Temperature Field

2014 ◽  
Vol 1006-1007 ◽  
pp. 177-180 ◽  
Author(s):  
Vladimir I. Andreev ◽  
Daniil A. Kapliy
Keyword(s):  
Differential Equation ◽  
Cylindrical Shell ◽  
Temperature Field ◽  
Strain State ◽  
Axisymmetric Problem ◽  
Neutron Fluence ◽  
Variable Coefficients ◽  
Accurate Solution ◽  
Combined Action ◽  
Mutual Action

There is a solution of the problem of stress-strain state determining in a concrete thick-walled tube, when the temperature field and the neutron fluence at the inner face are set. The mutual action of the specified factors is identified in this axisymmetric problem, as well as influence of inhomogeneity of shell materials, which is due to radiation and heat impact. The problem reduces to a differential equation with variable coefficients. The allowance for the mutual action of the specified factors and the variable Young’s module lets to arrive to a more accurate solution.

Elasto-plastic state of curve beam system subjected to complex loading

1996 ◽  
Vol 18 (4) ◽  
pp. 14-22
Author(s):  
Vu Khac Bay
Keyword(s):  
Cylindrical Shell ◽  
Solution Method ◽  
Complex Loading ◽  
Numerical Results ◽  
Elastic Solution ◽  
Plastic State ◽  
Curve Beam ◽  
Elastic State ◽  
Elastic Plastic ◽  
Beam System

Investigation of the elastic state of curve beam system had been considered in [3]. In this paper the elastic-plastic state of curve beam system in the form of cylindrical shell is analyzed by the elastic solution method. Numerical results of the problem and conclusion are given.

TECHNOLOGICAL CONTROL OF THE CONTACT PRESSURE ON THE CYLINDRICAL SUBSTRATE FROM THE SIDE OF THE COATING ADDITIVELY FORMED ON ITS EXTERNAL SURFACE

2020 ◽  
Author(s):  
Dmitriy Parshin
Keyword(s):  
Stress State ◽  
Contact Pressure ◽  
Mechanical Model ◽  
External Surface ◽  
Layer By Layer ◽  
Layer Formation ◽  
Technological Control ◽  
Manufactured Products ◽  
Arbitrary Thickness

The article gives an example of controlling the stress state parameters of additively manufactured products. The study was carried out on the basis of a developed non-classical mechanical model of the process of layer-by-layer formation of a coating of arbitrary thickness on a cylindrical substrate. The model is based on modern concepts of the mechanics of continuously growing bodies and allows one to obtain fairly simple analytical dependencies. On the basis of the latter, the problem of technological control of the evolution of contact pressure at the substrate – coating interface is solved in the article. A number of practically significant conclusions have been made.

scholarly journals Fabrication of cyanine dye thin films grown by a layer-by-layer method

2015 ◽  
Vol 2 (7) ◽  
pp. 076402 ◽  
Author(s):  
Junpei Nagauchi ◽  
Osamu Kojima ◽  
Takashi Kita ◽  
YongGu Shim
Keyword(s):  
Thin Films ◽  
Cyanine Dye ◽  
Layer By Layer ◽  
Layer Method

Synthesis of fly-ash cenospheres coated with polypyrrole using a layer-by-layer method

2011 ◽  
Vol 44 (44) ◽  
pp. 445301 ◽  
Author(s):  
Qin Li ◽  
Bing Wang ◽  
Chuang Li ◽  
Jianfeng Pang ◽  
Jianping Zhai
Keyword(s):  
Fly Ash ◽  
Layer By Layer ◽  
Layer Method ◽  
Fly Ash Cenospheres

scholarly journals Effect of Sepiolite-Loaded Fe2O3 on Flame Retardancy of Waterborne Polyurethane

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Tong Xu ◽  
Di Qian ◽  
Yelei Hu ◽  
Yuanzhao Zhu ◽  
Yi Zhong ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Waterborne Polyurethane ◽  
Layer By Layer ◽  
Solution Deposition ◽  
Good Thermal Stability ◽  
Layer Method ◽  
Combustion Tests ◽  
Microscopic Morphology ◽  
Coated Cotton ◽  
Thermal Stability Of

In this study, a kind of inorganic composite flame retardant (Sep@Fe2O3) was prepared by combining solution deposition and calcination methods using sepiolite microfiber material as carrier. This inorganic compound flame retardant was combined with waterborne polyurethane (WPU) through layer-by-layer method to prepare WPU composites. The SEM and EDS, TEM, and XRD were used to characterize the microscopic morphology and crystal structure of WPU composites. Thermogravimetric analysis tests confirmed the good thermal stability of WPU/Sep@Fe2O3 composites; at the temperature of 600°C, the carbon residual percentage of WPU/Sep, WPU/Fe2O3, and WPU/Sep@Fe2O3 composites is 7.3%, 12.2%, and 13.4%, respectively, higher than that of WPU (1.4%). Vertical combustion tests proved better flame-retardant property of WPU/Sep@Fe2O3 composite-coated cotton than noncoated cotton. The microcalorimeter test proved that the PHRR of WPU/Sep@Fe2O3 composites decreased by 61% compared with that of WPU. In addition, after combining with Sep@Fe2O3, the breaking strength of WPU increased by 35%.

Pressurized Cylindrical Shell With a Rigid Circular Inclusion

1978 ◽  
Vol 100 (2) ◽  
pp. 158-163 ◽  
Author(s):  
D. H. Bonde ◽  
K. P. Rao
Keyword(s):  
Differential Equation ◽  
Cylindrical Shell ◽  
Shallow Shell ◽  
Circular Inclusion ◽  
Hankel Functions ◽  
Curvature Parameter ◽  
Shell Equations ◽  
Limiting Case ◽  
Rigid Circular Inclusion ◽  
Good Agreement

The effect of a rigid circular inclusion on stresses in a cylindrical shell subjected to internal pressure has been studied. The two linear shallow shell equations governing the behavior of a cylindrical shell are converted into a single differential equation involving a curvature parameter and a potential function in nondimensionalized form. The solution in terms of Hankel functions is used to find membrane and bending stressses. Boundary conditions at the inclusion shell junction are expressed in a simple form involving the in-plane strains and change of curvature. Good agreement has been obtained for the limiting case of a flat plate. The shell results are plotted in nondimensional form for ready use.

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