Study on Mechanical Model of Balance and Stiffness Characteristics of Fiber Reinforced Bellows Type Rubber Hose

2020 ◽  
Vol 12 (7) ◽  
pp. 981-993
Author(s):  
Gao Hua ◽  
Shuai Changgeng ◽  
Xu Guomin
Keyword(s):  
Internal Pressure ◽  
Mechanical Model ◽  
Tensile Deformation ◽  
Structural Parameters ◽  
Curvature Radius ◽  
Mechanical Equilibrium ◽  
Rubber Hose ◽  
Equilibrium Angle ◽  
Stiffness Characteristics ◽  
Winding Angle

The mechanical model related to the balance and stiffness characteristics of the bellows type rubber hose under internal pressure was studied. Based on the thin shell theory without considering bending moments and shear force, the equilibrium equation of the bellows type hose was established to obtain the mechanical equilibrium angle under different mechanical environments. Considering the deformation characteristics of the rope structure and the mechanical equilibrium angle of the hose, the deformation of the bellows type rubber hose was divided into two stages, including winding angle deflection and tensile deformation of fiber. Then the constitutive model of anisotropic material was introduced, and the physical equation of the bellows type hose was established to obtain the mechanical model of the balance and stiffness characteristics. According to the mechanical model, the influence of initial fiber winding angle, fiber layer thickness, the radius at the two ends of the hose, the length of hose, the curvature radius and internal pressure of hose on the balance and stiffness characteristics of hose was studied. Eventually, the structure of the hose was designed based on the mechanical model, to optimize the balance and stiffness characteristics of hose. The balance and stiffness characteristics of the optimized hose were verified by experiments. The theoretical and experimental results indicated that, the mechanical model of the balance and stiffness characteristics of the hose can be the theoretical basis for the optimization of structural parameters.

Study on theoretical model of burst pressure of fiber reinforced arc-shaped rubber hose with good balance performance

2020 ◽  
pp. 096739112094948
Author(s):  
Gao Hua ◽  
Shuai Changgeng ◽  
Ma Jianguo ◽  
Xu Guomin
Keyword(s):  
Theoretical Model ◽  
Mechanical Model ◽  
Tensile Deformation ◽  
Structural Parameters ◽  
Internal Force ◽  
Burst Pressure ◽  
Rubber Hose ◽  
Balance Performance ◽  
Good Balance ◽  
Braiding Angle

This paper focus on the optimum design of the arc-shaped rubber hose, so that the hose has a good balance performance and a higher burst pressure. Based on the thin shell theory without considering bending moments and shear force, the equilibrium equation was established to obtain the internal force of the arc-shaped hose under internal pressure, and the burst pressure of the arc-shaped rubber hose was obtained by using Tsai-Hill failure criterion. According to the mechanical model of burst pressure, the influence of structural parameters on the burst pressure and distribution of vulnerable positions of arc-shaped rubber hose was studied. Then, in order to determine the structural parameters of the hose satisfying the balance performance, the deformation of the arc-shaped rubber hose was divided into two stages, including braiding angle deflection and tensile deformation of fiber, and the mechanical model of balance performance of the arc-shaped rubber hose was established. Eventually, on the basis of satisfying the balance performance of the hose, the hose was optimized for higher burst pressure. The correctness of the theoretical model and the optimization results were verified by experiments.

Establishment and verification of theoretical model for forming design of balanced curved rubber hose

2020 ◽  
pp. 096739112092592
Author(s):  
Gao Hua ◽  
Shuai Changgeng ◽  
Xu Guomin
Keyword(s):  
Theoretical Model ◽  
Simulation Model ◽  
Structural Parameters ◽  
Axial Direction ◽  
Element Model ◽  
Rubber Hose ◽  
Balance Performance ◽  
Equilibrium Angle ◽  
Calculation Results ◽  
Thin Shell Theory

This article focuses on the establishment of theoretical model for the formation of balanced curved rubber hose under pressure. According to the rotation angle of the cord along the axial direction in the curved rubber hose is the same as that in the straight hose before forming, the theoretical model of the straight hose length was established. Then based on the thin shell theory without considering bending moments and shear force, and considering the deformation characteristics of the rope structure and the mechanical equilibrium angle of the hose, the theoretical model of the balance performance was established. According to the theoretical model, the influence of structural parameters of curved hose on the length of the straight hose and the balance performance of hose was studied. Eventually, the finite element model was established to simulate the deformation process of the curved hose. Based on the calculation results of the theoretical and simulation model, the experiment of forming and balance performance of the curved hose was carried out. The experimental results are in good agreement with the theoretical and simulation model.

scholarly journals Axial and lateral stiffness of spherical self-balancing fiber reinforced rubber pipes under internal pressure

2021 ◽  
Vol 28 (1) ◽  
pp. 96-106
Author(s):  
Guo-min Xu ◽  
Chang-geng Shuai
Keyword(s):  
Internal Pressure ◽  
Vibration Suppression ◽  
Structural Parameters ◽  
Axial Stiffness ◽  
Lateral Stiffness ◽  
Fiber Reinforced ◽  
Investigation Methods ◽  
Nonlinear Stress ◽  
Relationship Of ◽  
Winding Angle

Abstract Fiber reinforced rubber pipes are widely used to transport fluid at locations requiring flexible connections in pipeline systems. The spherical self-balancing fiber reinforced rubber pipes with low stiffness are drawing attention because of their vibration suppression performance under high internal pressure. In this paper, a theoretical model is proposed to calculate the axial stiffness and lateral stiffness of spherical self-balancing fiber reinforced rubber pipes. The inhomogeneous anisotropy of the reinforced layer and the nonlinear stress-strain relationship of the reinforced fiber are considered in the model. The accuracy of the model is verified by experimental results. Theoretical calculation finds that both the axial and lateral stiffness are influenced significantly by the key structural parameters of the pipe (the axial length, the circumferential radius at the end, the meridional radius, and the initial winding angle). The stiffness can be reduced remarkably with optimal meridional radius and initial winding angle, without any side effect on the self-balance of the pipe. The investigation methods and results presented in this paper will provide guidance for design of fiber reinforced rubber pipes in the future.

Effects of Thickness and Winding Angle of the Laminate on Internal Pressure Capacity of Thermoplastic Composite Pipes

2021 ◽  
Author(s):  
Heping Xia ◽  
Chen Shi ◽  
Jialu Wang ◽  
Xingxian Bao ◽  
Hongwei Li ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Thermoplastic Composite ◽  
Composite Pipes ◽  
Winding Angle

The Effect of Structural Parameters on Response Characteristics of Aeroelastic System in the Presence of Dynamic Stall

2021 ◽  
Author(s):  
Zhan Qiu ◽  
Fuxin Wang
Keyword(s):  
Limit Cycle ◽  
Structural Parameters ◽  
Dynamic Pressure ◽  
Angle Of Attack ◽  
Dynamic Stall ◽  
System Response ◽  
Structural Stiffness ◽  
Aeroelastic System ◽  
Equilibrium Angle ◽  
Minimum Angle

Abstract The effect of structural paramters on the response and aerodynamic stiffness characteristics of the free aeroelastic system under the influence of dynamic stall is investigated adopting CFD (Computational Fluid Dynamics) method. The equilibrium angle of the spring and the structural stiffness are taken as parameters of interest. Systems with small equilibrium angles enter the symmetric limit-cycle state more quickly after a Hopf bifurcation and experience dynamic stall in both directions, rather than slowly decreasing in minimum angle of attack and remaining in the asymmetric limit-cycle state before dynamic stall in the opposite direction, as is the case with systems with large spring equilibrium angles. Thus, aerodynamic stiffness of system with large equilibrium angles can be more significantly influenced by the change in aerodynamic moment characteristics at the minimum angle of attack. Furthermore, by increasing the initial angular velocity, we find that the system response all becomes symmetric limit cycle and therefore the aerodynamic stiffness appears to have a monotonically increasing characteristic. As to the effect of structural stiffness, it is found that the limit cycle amplitude first increases with structural stiffness after bifurcation, then the amplitude is unchanged with varying structural stiffness at higher Mach number. Energy maps show that the parametric distribution of the energy transfer contributes to this phenomenon. Moreover, when entering the symmetric limit cycle state, the structural stiffness no longer has a significant effect on the aerodynamic stiffness of the system, as the increase in the aerodynamic stiffness is determined solely by the increase in dynamic pressure without the effect of changes in moment characteristics.

Effects of Thickness and Winding Angle of the Laminate on Internal Pressure Capacity of Thermoplastic Composite Pipes

2020 ◽  
Author(s):  
H. Xia ◽  
C. Shi ◽  
J. Wang ◽  
X. Bao ◽  
H. Li ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Oil And Gas ◽  
Solid Wall ◽  
Three Dimensional ◽  
Oil And Gas Industry ◽  
Thermoplastic Composite ◽  
Critical Parameters ◽  
Element Analysis ◽  
Composite Pipes ◽  
Winding Angle

Abstract Thermoplastic composite pipes (TCPs) are increasingly used to transport hydrocarbons and water in the oil and gas industry due to their superior properties including corrosion resistance, thermal insulation, light weight, etc. The cross-section of TCPs generally consists of three layers: inner liner, composite laminate, and outer jacket. Three layers are bonded together and form a solid-wall construction. Inner liner and outer jacket made of thermoplastic polymer provide protective barriers for the laminate to against the inner fluid and outer environment. The laminate is constructed by an even number of helically wounded continuous fiber reinforced thermoplastic composite tapes. In this study, mechanical behaviors of a TCP under an internal pressure were investigated by using analytical and finite element analysis (FEA) methods. The analytical method which is based on the three-dimensional (3D) anisotropy elastic theory can take account of non-uniformly distributed stress and strain through the thickness of the pipe wall. FEA models were setup by using the software ABAQUS to predict the stress distribution of the pipe. 3D Tsai-Wu failure criterion was used to predict the maximum internal pressure of the pipe. Effects of some critical parameters, such as the winding angle of composite tapes and the number of reinforced plies, on the internal pressure capacity of TCPs were studied. Results obtained from the analytical and FEA methods were fairly agreed with each other, which showed that with the increasing of the number of reinforced plies the internal pressure capacity of a TCP gradually increases and approaches to an extreme value. In addition, the optimal winding angle which results the maximum internal pressure is not a constant value, instead, it varies with the increasing thickness of the laminate layer. This study provides useful tools and guidance for the design and analysis of TCPs, and is currently under validation through experiments.

Comparative study of tubular composite structure subjected to internal pressure loading: Analytical and numerical investigation

2020 ◽  
pp. 002199832096979
Author(s):  
Ammar Maziz ◽  
Saïd Rechak ◽  
Mostapha Tarfaoui
Keyword(s):  
Internal Pressure ◽  
Layered Composite ◽  
Tubular Structure ◽  
Shear Stresses ◽  
Working Pressure ◽  
Angle Variation ◽  
Composite Pipe ◽  
D Model ◽  
Winding Angle ◽  
Composite Carbon

The purpose of this paper is to study the mechanical behaviour of a multi-layered composite tubular structure with various orientations subjected to internal hydrostatic pressure. The first part of this paper is devoted to studying stress analysis using the analytical approach. The 3 D analysis of the composite pipe originally made with carbon/epoxy is studied and compared with a pipe made of E-glass/epoxy; each layer is examined with five orientations. The hoop, axial, longitudinal, transversal, and shear stresses are obtained for each layer of the composite pipe simultaneously. The hybrid composite pipe is done to take advantage of the properties of each fiber and the studied hybridisation. `To validate some cases of the presented results, a numerical model is developed in ANSYS workbench software; this particular model is characterized by very close to the theoretical results. Throughout the investigation, it is observed that the behaviour of composite carbon/epoxy is the most resistant compared to glass/epoxy, and the results obtained in the case of hybrid shows that the variability of the stacking sequences generates the variation of the behaviour on composite hybrid pipe. It can be increased the design material utilisation and working pressure level by winding angle variation or hybridized between stacking sequences. The ability of this new 3 D model to simulate the stress evolution in the full-scale composite tubular structure under internal pressure events were demonstrated.

A refined stiffness model of rolling lobe air spring with structural parameters and the stiffness characteristics of rubber bellows

Measurement ◽  
2021 ◽  
Vol 169 ◽  
pp. 108355
Author(s):  
Jun-Jie Chen ◽  
Zhi-Hong Yin ◽  
Xian-Ju Yuan ◽  
Guang-Qi Qiu ◽  
Kong-Hui Guo ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Air Spring ◽  
Stiffness Model ◽  
Stiffness Characteristics

scholarly journals A predator-prey optimization for structural health monitoring problems

2019 ◽  
Vol 281 ◽  
pp. 01004
Author(s):  
Christelle Geara ◽  
Rafic Faddoul ◽  
Alaa Chateauneuf ◽  
Wassim Raphaël
Keyword(s):  
Genetic Algorithm ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Mechanical Model ◽  
Structural Parameters ◽  
Bayesian Updating ◽  
Frame Structure ◽  
Structural Elements ◽  
Predator Prey ◽  
Concrete Frame

Monitoring a structure using permanent sensors has been one of the most interesting topics, especially with the increase of the number of aging structures. Such a technique requires the implementation of sensors on a structure to predict the condition states of the structural elements. However, due to the costs of sensors, one must judiciously install few sensors at some defined locations in order to maximize the probability of detecting potential damages. In this paper, we propose a methodology based on a genetic algorithm of type predator-prey with a Bayesian updating of the structural parameters, to optimize the number and location of the sensors to be placed. This methodology takes into consideration all uncertainties related to the degradation of the elements, the mechanical model and the accuracy of sensors. Starting with two initial populations representing the damages (prey) and the sensors (predator), the genetic algorithm evolves both populations in order to converge towards the optimal configuration of sensors, in terms of number and location. The proposed methodology is illustrated by a two-story concrete frame structure.

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