Thickness and Fiber Content Optimization in VARTM Method for High Speed Craft

2013 ◽  
Vol 789 ◽  
pp. 412-416 ◽  
Author(s):  
Sunaryo ◽  
Gerry Liston Putra ◽  
Sri Maharani Lestari
Keyword(s):  
High Speed ◽  
Production Efficiency ◽  
High Strength ◽  
Fiber Content ◽  
Optimum Number ◽  
Material Efficiency ◽  
Hull Structure ◽  
The Matrix ◽  
Improve Production Efficiency

To improve production efficiency and quality of fiber-glass boatyards many research have been done both through technological as well as management aspects. One of these developments is Vacuum Assisted Resin Transfer Molding (VARTM) which is claimed to have high strength and material efficiency. This method has not much been applied in Indonesian boatyards, most of them are still using conventional hand lay-up. The research is aimed to investigate the strength of the composite and the optimum amount of materials to obtain the required strength for its application on boat buildings. Experimental approach was conducted in the research using 800 biaxial and 900 unidirectional E-glass for reinforcement, and vinylester (RIPOXY R-802-EX-1) resin for the matrix. The ultimate tensile strength and Youngs modulus of the composites are obtained through tensile and flexural test based on ASTM D 3039 and ASTM D 790 standards. The data obtained are used to determine the optimum number of layers and fiber content on certain locations of the boat hull structure in order to comply with the requirements of classification rules.

MODELING THE ACCUMULATION OF DAMAGES AND THE FAILURE OF CERAMIC COMPOSITES Al2O3-ZrO2, OBTAINED BY ADDITIVE TECHNOLOGIES, UNDER HIGH-SPEED LOADING

2021 ◽  
pp. 140-157
Author(s):  
V.V. Promakhov ◽  
◽  
M.V. Korobenkov ◽  
N.A. Schultz ◽  
A.S. Zhukov ◽  
...  
Keyword(s):  
Crack Resistance ◽  
High Speed ◽  
High Strength ◽  
Nonlinear Effects ◽  
Ceramic Composites ◽  
Additive Technologies ◽  
The Matrix ◽  
Mesoscopic Level ◽  
Martensitic Phase Transformations ◽  
Strengthening Particles

Functional ceramic composite materials are widely used in industry due to their high strength, hardness, high operating temperature, and chemical inertness. Among the most famous types of functional ceramics are the ceramic composites based on the Al2O3-20% ZrO2 system. In this work, the effect of the loading rate on the crack resistance is studied as well as the effect of the crack resistance of ceramic composites Al2O3-20% t-ZrO2 with a mass content of submicron tZrO2 particles on the high-speed compression of model specimens in shock waves and on the high-speed tension in the region of interaction of unloading waves. It is established that nonlinear effects of the mechanical behavior of ceramic composites ZrO2-Al2O3 with a transformationhardened matrix obtained by additive technologies are manifested at shock loading amplitudes close to or exceeding the Hugoniot elastic limit. Nonlinear effects under intense dynamic impacts on the considered composites are associated with the processes of self-organization of deformation regimes at a mesoscopic level, as well as with the occurrence of martensitic phase transformations in the matrix volumes, which are adjacent to strengthening particles. The modeling approach presented in this work can be used to determine the dynamic characteristics of ceramic composites up to shock loads of 1000 m/s.

Affect of Application of Hairiness Reduction Equipment on Winding Quality

2011 ◽  
Vol 331 ◽  
pp. 437-443
Author(s):  
Jian Ping Lin ◽  
Hong Jun Cui
Keyword(s):  
High Speed ◽  
Production Efficiency ◽  
Standard Test ◽  
Appearance Quality ◽  
Yarn Quality ◽  
Test Conditions ◽  
Yarn Hairiness ◽  
The Given

In order to reduce yarn hairiness of spooling procedure and improve the quality of knotless yarn, contrast experiments, under the given standard test conditions, is performed among several cheese with or without airflow hairiness reduction equipment (HRE); analyzing and discussing the application effect and affect of HRE on yarn quality indexs. It is found from the investigation that the application of airflow HRE can effectively reduce yarn hairiness and also reduce yarn’s CV value of tenacity and improve its minimum tenacity, which can decrease ends’ breakage and machine suspension during high speed warping and high speed weaving production and improve weaving efficiency and appearance quality of fabric. Through analytic comparison, the application of airflow HRE will slightly increase yarn neps, but it’s still an effective method for reducing yarn hairiness and improve fabric appearance quality and weaving production efficiency.

Study of the Knife-Gap Adjustment for Rolling-Cut Bilateral Shear

2013 ◽  
Vol 364 ◽  
pp. 57-60
Author(s):  
Yu Bao Zhang ◽  
Da Zhi Zhang ◽  
Meng Jin
Keyword(s):  
Linear Regression ◽  
Production Efficiency ◽  
Plate Thickness ◽  
High Strength ◽  
Regression Equation ◽  
Linear Regression Equation ◽  
Key Factors ◽  
Matlab Toolbox ◽  
Adjustment Time ◽  
Improve Production Efficiency

The knife-gap accuracy of rolling-cut bilateral shear is one of the key factors influencing the cutting quality. This paper through the site of a high strength low alloy steel shear test, a linear regression equation for the relation between knife-gap and plate thickness is obtained and optimize by using MATLAB Toolbox, after optimization of the linear regression equation can be conveniently used, reduce knife-gap adjustment time, improve production efficiency, reduce shearing defects.

Maintenance of Hydraulic Systems on Machine Tools

2013 ◽  
Vol 717 ◽  
pp. 375-377
Author(s):  
Huan Yun Wang ◽  
Chun Hui Pan
Keyword(s):  
Machine Tools ◽  
Production Efficiency ◽  
Good Condition ◽  
Reference Value ◽  
Workplace Safety ◽  
Production Costs ◽  
Hydraulic Systems ◽  
Systems Maintenance ◽  
Improve Production Efficiency

Proper maintenance of hydraulic equipments has a great significance to increase ratio of perfectness and utilization, ensure the quality of the project, extend service life, improve production efficiency and reduce production costs. The authors in this paper discuss the scientific measures to keep equipments in good condition and ensure workplace safety from the angle of hydraulic systems maintenance. It has reference value for proper care and maintenance of hydraulic systems on machine tools in the factorys.

scholarly journals The movement and forces of spinning solution in the nozzle during high-speed centrifugal spinning

2019 ◽  
Vol 14 ◽  
pp. 155892501982820 ◽  
Author(s):  
Yaoshuai Duan ◽  
Zhiming Zhang ◽  
Binbin Lu ◽  
Boya Chen ◽  
Zilong Lai
Keyword(s):  
Rotational Speed ◽  
High Speed ◽  
Large Scale ◽  
Production Efficiency ◽  
Critical Value ◽  
Parametric Model ◽  
Rotating Speed ◽  
Centrifugal Spinning ◽  
Novel Method

High-speed centrifugal spinning is a novel method to fabricate nanofiber. It has the potential to fabricate nanofiber on a large scale because its production efficiency is much greater than traditional methods. Nozzle is an important part of high-speed centrifugal spinning equipment because its length, shape, and diameter all will affect the morphology and quality of nanofiber. It is useful to study the movement and forces of spinning solution in the nozzle. In this article, the principle and equipment structure of high-speed centrifugal spinning are briefly introduced at first. Then the movement and forces of spinning solution are analyzed by establishing parametric model at nozzle. It can be found that the spinning solution is ejected from nozzle when the rotating speed reaches a critical value. The critical rotating speed is inversely proportional to the radius of nozzle and directly proportional to the viscosity of spinning solution. There are several nozzle structures proposed and compared for nozzle optimization. Finally, the effects of nozzle parameters, concentration of spinning solution, and rotational speed on the morphology of nanofiber are verified by high-speed centrifugal spinning experiments. It lays the foundation for optimizing spinning equipment.

scholarly journals Weaning Ages Do Not Affect the Overall Growth or Carcass Traits of Hu Sheep

Animals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 356
Author(s):  
Huiling Mao ◽  
Chong Wang ◽  
Zhongtang Yu
Keyword(s):  
Meat Quality ◽  
Production Efficiency ◽  
Age Groups ◽  
Carcass Characteristics ◽  
Stress Indicators ◽  
Weaning Age ◽  
Oxidative Stress Indicators ◽  
Hu Sheep ◽  
Improve Production Efficiency

This study aimed to determine effects of weaning ages on growth, rumen development, and carcass characteristics and meat quality of Hu lambs. Thirty male Hu lambs were randomly divided into two weaning age groups: Weaned at 30 (W30) or 45 (W45) d of age. Blood samples were collected on the day of weaning before lambs (n = 5) were slaughtered, and then rumen sample was collected immediately after they were slaughtered. The intake of all feeds increased with age (p < 0.05), but were not affected by weaning age (p > 0.05). Oxidative stress indicators and immune variables, the plasma biochemical parameters did not differ between the two different weaning ages (p > 0.05). The two weaning age groups also had similar (p > 0.05) concentration of ruminal total volatile fatty acid. The two weaning age groups did not differ in body weight, carcass characteristics, or meat quality (p > 0.05) at d 120. These results indicate that weaning half a month earlier than the typical weaning age does not significantly affect the growth, ruminal development, or carcass characteristics of Hu lambs, and they can be weaned at 30 d of age to improve production efficiency.

The Technology of Positional Detection in Automatic Wheelset Assembly Machine

2012 ◽  
Vol 184-185 ◽  
pp. 595-598
Author(s):  
Jun Xiao ◽  
Xin Cheng ◽  
Rong Fang ◽  
Jian Bin Han
Keyword(s):  
Control Systems ◽  
Real Time ◽  
Production Efficiency ◽  
Position Control ◽  
High Accuracy ◽  
Position Measurement ◽  
And Control ◽  
Measurement And Control ◽  
Improve Production Efficiency

This paper introduces a kind of position measurement and control systems in automatic wheelset assembly machine. This system adopts direct close-loop position control in the process of pressing and real time monitor position of wheel and axle with high accuracy. Compared with traditional wheelset assembly machine, it can improve production efficiency and ensure the quality of pressing through control the distance between backs of wheel flange and the position difference of two wheels accurately.

Basic Studies on the Production Technology for Application of Large Extrusion Profiles of Aluminum A6005A Alloy to Ship Structures

1999 ◽  
Vol 15 (03) ◽  
pp. 156-163
Author(s):  
Seung Il Seo ◽  
Chan Suk Lee ◽  
Sang Rok Lee
Keyword(s):  
Production Technology ◽  
High Speed ◽  
High Strength ◽  
Cost Effective ◽  
Production Method ◽  
Fatigue Tests ◽  
Ship Structures ◽  
Latent Defects ◽  
Basic Studies

Aluminum is the preferred metal fabric for high speed vessels due to its light weight and high strength. Among various aluminum alloys, A6005A alloy has enough strength and good extrudibility, so large hollow extrusion profiles of A6005A alloy may be applied to high speed vessels for cost effective design. In this paper, for application of large extrusion profiles of aluminum A6005A alloy to ship structures, production technology required in constructing the ship structure is studied, and the usefulness of the material is described. A structural design process, welding and a production method for hollow extrusion profiles of A6005A alloy have been proposed. To investigate fatigue strength of the weld joint with latent defects, tensile and bending fatigue tests have been performed. Possible painting schedules for the surface of the extrusion profiles have also been proposed and the quality of the painted surface has been proven by test. From this study it can be concluded that the large aluminum extrusion profile of A6005A alloy is a useful structural material for high speed vessels.

Edge Shape Control Technology Research of Very Thin Specifications DI Tinplate in Baosteel Cold Rolling

2012 ◽  
Vol 572 ◽  
pp. 171-175
Author(s):  
Jie Wen ◽  
Qing Dong Zhang ◽  
Xiao Feng Zhang ◽  
Kang Jian Wang
Keyword(s):  
Shape Control ◽  
Production Efficiency ◽  
Work Roll ◽  
Flatness Control ◽  
Control Capability ◽  
Tandem Cold Mill ◽  
Cold Mill ◽  
Edge Drop ◽  
Improve Production Efficiency

This paper study the key technique of very thin specifications DI tinplate based on 1420 tandem cold mill in Baosteel, to improve the strip edge shape quality. In our paper we put forward the idea to improve the DI tinplate edge drop control performance using the work roll contour technology, enhance the flatness control ability using the intermediate roll contour technology. The mill type of this CVC tandem cold mill is improved by these technologies, and its edge shape control capability is significantly increased. Production trial show that the improved mill type can effectively improve the edge shape quality of the very thin specifications DI tinplate, improve production efficiency and have a good application.

Development and production experience of the multilayer curtain-coated linerboard of Ji’an PM No. 3,

TAPPI Journal ◽  
2014 ◽  
Vol 13 (2) ◽  
pp. 17-25
Author(s):  
JUNMING SHU ◽  
ARTHAS YANG ◽  
PEKKA SALMINEN ◽  
HENRI VAITTINEN
Keyword(s):  
Titanium Dioxide ◽  
High Speed ◽  
Food Packaging ◽  
Production Efficiency ◽  
Positive Impact ◽  
Low Cost ◽  
Board Structure ◽  
Flexographic Printing ◽  
Curtain Coating ◽  
Coating Formulations

The Ji’an PM No. 3 is the first linerboard machine in China to use multilayer curtain coating technology. Since successful startup at the end of 2011, further development has been carried out to optimize running conditions, coating formulations, and the base paper to provide a product with satisfactory quality and lower cost to manufacture. The key challenges include designing the base board structure for the desired mechanical strength, designing the surface properties for subsequent coating operations, optimizing the high-speed running of the curtain coater to enhance production efficiency, minimizing the amount of titanium dioxide in the coating color, and balancing the coated board properties to make them suitable for both offset and flexographic printing. The pilot and mill scale results show that curtain coating has a major positive impact on brightness, while smoothness is improved mainly by the blade coating and calendering conditions. Optimization of base board properties and the blade + curtain + blade concept has resulted in the successful use of 100% recycled fiber to produce base board. The optical, mechanical, and printability properties of the final coated board meet market requirements for both offset and flexographic printing. Machine runnability is excellent at the current speed of 1000 m/min, and titanium dioxide has been eliminated in the coating formulations without affecting the coating coverage. A significant improvement in the total cost of coated white liner production has been achieved, compared to the conventional concept of using virgin fiber in the top ply. Future development will focus on combining low cost with further quality improvements to make linerboard suitable for a wider range of end-use applications, including frozen-food packaging and folding boxboard.

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