scholarly journals Tack measurement of bindered rovings for the dry fiber winding process

2021 ◽  
Author(s):  
Stefan Neunkirchen ◽  
Ralf Schledjewski
Keyword(s):  
Fiber Winding

Bulging bifurcation of inflated circular cylinders of doubly fiber-reinforced hyperelastic material under axial loading and swelling

2015 ◽  
Vol 22 (4) ◽  
pp. 666-682 ◽  
Author(s):  
Hasan Demirkoparan ◽  
Jose Merodio
Keyword(s):  
Potential Benefit ◽  
Arterial Wall ◽  
Axial Loading ◽  
Circular Cylinders ◽  
Orthotropic Materials ◽  
Aneurysm Formation ◽  
Inner Radius ◽  
Fiber Winding ◽  
Hoop Stresses ◽  
Winding Angle

In this paper, we examine the influence of swelling on the bulging bifurcation of inflated thin-walled cylinders under axial loading. We provide the bifurcation criteria for a membrane cylinder subjected to combined axial loading, internal pressure and swelling. We focus here on orthotropic materials with two preferred directions which are mechanically equivalent and are symmetrically disposed. Arterial wall tissue is modeled with this class of constitutive equation and the onset of bulging is considered to give aneurysm formation. It is shown that swelling may lead to compressive hoop stresses near the inner radius of the tube, which could have a potential benefit for preventing aneurysm formation. The effects of the axial stretch, the strength of the fiber reinforcement and the fiber winding angle on the onset of bifurcation are investigated. Finally, a boundary value problem is studied to show the robustness of the results.

On prismatic and bending bifurcations of fiber-reinforced elastic membranes under swelling with application to aortic aneurysms

2021 ◽  
pp. 108128652110587
Author(s):  
Murtadha J. Al-Chlaihawi ◽  
Heiko Topol ◽  
Hasan Demirkoparan ◽  
José Merodio
Keyword(s):  
Axial Loading ◽  
Material Constant ◽  
Exponential Model ◽  
Aortic Aneurysms ◽  
Orthotropic Materials ◽  
Fiber Direction ◽  
Fiber Reinforced ◽  
The Matrix ◽  
Elastic Membranes ◽  
Fiber Winding

The influence of swelling on prismatic and bending bifurcation modes of inflated thin-walled cylinders under axial loading is examined. The bifurcation criteria for a membrane cylinder subjected to combined axial loading, internal pressure, and swelling is provided. We consider orthotropic materials with two preferred directions which are mechanically equivalent and symmetrically disposed. The mechanical behavior of the matrix is described by a swellable isotropic model. The isotropic material is augmented with two functions that are equal, each one of them accounting for the existence of a unidirectional reinforcement. Two reinforcing models that depend only on the stretch in the fiber direction are considered: the so-called standard reinforcing model and an exponential one. The analysis of bifurcation modes for these models under the conditions at hand may establish the connection with modeling of the normal and diseased aorta in arterial wall tissue. The effects of the axial stretch, the strength of the fiber reinforcement and the fiber winding angle on the onset of prismatic and bending bifurcations are investigated. It is shown that for membranes without fibers, prismatic bifurcation is not feasible. On the other hand, bending bifurcation is more likely to occur for swollen cylinders. However, for a particular model of fiber-reinforced membranes, the standard model, there exists a domain of deformation values together with material constant values that may trigger prismatic bifurcation. The exponential model does not allow prismatic bifurcations. Both models allow bending bifurcation and may or may not trigger it depending on the deformation together with material parameters.

The Method for Real-Time Length Measurement of Fiber Winding

2013 ◽  
Vol 380-384 ◽  
pp. 919-922
Author(s):  
Chen Xia Guo ◽  
Rui Feng Yang
Keyword(s):  
Real Time ◽  
Detection Algorithm ◽  
Moving Target ◽  
Fiber Optic Gyroscope ◽  
Optical Encoder ◽  
The Real ◽  
Time Length ◽  
Fiber Coil ◽  
Fiber Winding ◽  
Coil Winding

The paper discusess mainly how to accurately measure the real-time length of fiber optic gyroscope sensing coil (fiber coil) in the process of FOG coil winding. First, using the improved moving target detection algorithm to process the fiber images collected by machine vision. Secondly, using software algorithm to calculate the real-time radius of fiber winding. Finaly, combining the incremental optical encoder with real-time radius to calculate real-time winding length of fiber coil.

The Numerical Simulation Research of Internal Curing Process for Fiber Winding Composite Shell

2011 ◽  
Vol 19 (4-5) ◽  
pp. 319-326 ◽  
Author(s):  
Jiazhong Xu ◽  
Xinying Wang ◽  
Ming Qiao ◽  
Ying Yu
Keyword(s):  
Numerical Simulation ◽  
Composite Shell ◽  
Internal Curing ◽  
Curing Process ◽  
Simulation Research ◽  
Fiber Winding

Torque-Fiber-Winding (TFW)-Procedure: Manufacturing of Textile-Based Unidirectional Prepreg for Raw Material and Material Development of Carbon Fibre Reinforced Thermoplastics

2017 ◽  
Vol 742 ◽  
pp. 498-505
Author(s):  
Angelika Kolonko ◽  
Frank Helbig ◽  
Jürgen Tröltzsch ◽  
Daisy Nestler ◽  
Lothar Kroll
Keyword(s):  
Carbon Fibre ◽  
Degrees Of Freedom ◽  
Single Layer ◽  
Nonwoven Fabric ◽  
Fibre Volume ◽  
Raw Material ◽  
Laboratory Staff ◽  
Material Development ◽  
Fiber Winding ◽  
Reinforced Thermoplastics

There is the need to determine the process capability of available and novel carbon fibre (CF) roving with minimal material and reproducible procedures in the field of research and development of continuous fibre reinforced composites and structural components, as well as to identify the power delivery in thermoplastic laminate constructions. The innovative TFW procedure with the appropriate system technology allows the production of piece size variable unidirectional (UD) prepreg in a continuous sequential process of spiral winding. A flexible surface design, resulting in the partial fixation of a single highly spread CF roving on fine nonwoven fabric. By defined accumulating of composite components, the fibre volume content (FVC) is adjustable and correspond to the level of spreading and to the grammage of nonwoven fabric. Minimum single layer thickness promote compound homogeneity and thereby allow the generation of greatest possible degrees of freedom in load-oriented structural design of CF-reinforced thermoplastic lightweight products in the laboratory staff.

Analysis of the Influence of Tension on the Fiber Winding Track

2015 ◽  
Vol 8 (8) ◽  
pp. 133-142
Author(s):  
Huijun Li ◽  
Shuxiang Guo ◽  
Xiufen Ye
Keyword(s):  
Fiber Winding

EXPERIMENTAL INVESTIGATION OF QUALITY METRICS FORMATION PROCESS DURING PLASTIC MILLING

2016 ◽  
Vol 2016 (3) ◽  
pp. 129-136 ◽  
Author(s):  
Павел Черданцев ◽  
Pavel Cherdantsev ◽  
Андрей Марков ◽  
Andrey Markov ◽  
Софья Катаева ◽  
...  
Keyword(s):  
Composite Materials ◽  
Tool Wear ◽  
Cutting Speed ◽  
Experimental Investigations ◽  
Geometrical Parameters ◽  
Original Design ◽  
Transverse Fiber ◽  
Fiber Winding ◽  
Estimate Of Parameter ◽  
Cutting Modes

Composite materials are widely used in mechanical engineering, but at edge cutting machining, in particular, during milling these materials a number of peculiarities arise which must be taken into account at the definition of cutting modes and design-geometrical parameters of cutters. Besides, new composite materials machining does not allow using effectively the recommendations developed earlier. In such a way, to solve such a problem it is necessary to carry out experimental investigations on the analysis of the influence of milling mode characteristics and design-geometrical of a tool upon values of roughness of a surface processed and tool wear. As a cutter for investigations there were taken hardmetal endmilling cutters of TC-8 (tungstencobalt) type, the experimental samples – pipes made of composite material with oblique longi-tudinal-transverse fiber winding (OLTFW). As varied parameters were adopted cutting modes: cutting speed V, m/min, feed S, mm/tooth and milling depth t, mm. During the experiments were controlled the following parameters: tool wear Δ, mkm, roughness of the surface Ra, mkm and a depth of a faulty layer h, mkm. To carry out the experiments there was offered an original design of an assembly milling cutter which allows defining in an experimental way optimum geo-metrical parameters of a tools to achieve output milling parameters specified. On the basis of experiments data there are obtained dependences allowing the estimate of parameter modes influence upon the period of cutter duration at the same time a temperature is affected mostly by a milling depth and a feed on a tooth affects the wear of an end flank.

The Application of the Tension Online Detection and Control Technology

2012 ◽  
Vol 503-504 ◽  
pp. 171-173
Author(s):  
Xian Fang Wang ◽  
Xue Qin Ren ◽  
Wen Ya Li
Keyword(s):  
Optical Fiber ◽  
Production Process ◽  
New Technology ◽  
Tension Control ◽  
Control Technology ◽  
Practical Application ◽  
Online Detection ◽  
Fancy Yarns ◽  
Fiber Winding ◽  
And Control

The main contents of this article are the practical application of a new technology about the tension online detection and control, including the tension control in the production process and the winding process. For example, the optical fiber winding, the winding of roving, the winding of loose cone frame, special fancy yarns winding and so on. The new function is so strong that can be used in many aspects, which can meet the special production requirements and improve the product quality.

Design of Cotton-Picking Laptop Machine without Winding

2011 ◽  
Vol 467-469 ◽  
pp. 593-596
Author(s):  
Feng Luo ◽  
Ke Qiu
Keyword(s):  
Cotton Fiber ◽  
Gear Transmission ◽  
Transmission Mechanism ◽  
Labor Intensity ◽  
Direct Drive ◽  
Improve Efficiency ◽  
Cotton Picking ◽  
Fiber Winding

The cotton fiber winding has always been a problem for a picking cotton machine to conquer. This design theoretically pointed out the reasons, at the same time around launched a mechanical cotton-pickers laptop without transmission mechanism, but with a flexible helicopter. This machine is made of cotton picking a direct drive of micro-motors to rotate, the protection cover to picking cotton, and gear transmission by the wind, thus instantly complete cotton flower of picking cotton, improve efficiency, but also greatly reduce the labor intensity of cotton.

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