Quality of CFRP Cross-Sections by Cutting at the Situation of Resin Infiltration and their Defects Suppressing

2014 ◽  
Vol 912-914 ◽  
pp. 490-494
Author(s):  
Yu Qin Guo ◽  
Zhao Meng ◽  
Min Hang Sun ◽  
Wei Chen ◽  
Long Chen
Keyword(s):  
Carbon Fiber ◽  
Cross Sections ◽  
Automobile Industry ◽  
Process Conditions ◽  
Experimental Conditions ◽  
Resin Infiltration ◽  
Edge Geometry ◽  
Series Of Experiments ◽  
The Impact

As a kind of promising lightweight material, CFRP (Carbon Fiber Reinforcement Polymers) have been widely concerned in automobile industry in last decades. In the present work, series of experiments are conducted to investigate the impact of key process conditions, including the cutting edge geometry, curing process and cutting manner, on the CFRP cross-sections quality by cutting at resin infiltration during implementing the CFRP parts integrated manufacturing processes based on RFI process. For the typical cross-section defect such as the debunching of carbon fiber, chippings of carbon fiber and resin salivation, authors explain why that happens and propose the corresponding suppressing measures. Research results show that, under the existing experimental conditions, the optimal process scheme is to combine the large arc edge with curing before punch returns back and press cutting to obtain the desired CFRP cross-sections.

Pressure Effects of Foreign Gases on the 535.0 nm Fluorescence Line of Thallium

1985 ◽  
Vol 40 (8) ◽  
pp. 800-809 ◽  
Author(s):  
E. Lisicki ◽  
A. Bielski ◽  
J. Szudy ◽  
J. Wolnikowski
Keyword(s):  
Cross Sections ◽  
Pressure Effects ◽  
Pressure Broadening ◽  
Fluorescence Line ◽  
Series Of Experiments ◽  
The Cross ◽  
The Impact

Results of a series of experiments on pressure effects caused by various foreign gases on the 535.0 nm Tl fluorescence line emitted due to the photodissociation of TlI-molecules are summarized and some aspects of the Doppler and pressure broadening of this line are discussed. The impact broadening- and shift-cross sections are determined for two sets of mean relative velocities ū of the emitter-perturber pair. An attempt is made to analyse the cross-sections for different perturbers by investigating their dependence on the quantity (α/ū)2/5, where α is the polarizability of the perturber.

Learning Relations: An Evaluation of Search Strategies

1993 ◽  
Vol 18 (2-4) ◽  
pp. 221-232
Author(s):  
Cristina Baroglio ◽  
Marco Botta ◽  
Attilio Giordana
Keyword(s):  
Information Gain ◽  
A Priori ◽  
Search Strategies ◽  
Test Cases ◽  
Experimental Conditions ◽  
Description Languages ◽  
The Impact ◽  
Learning Relations ◽  
Learning Data

Inducing concept descriptions in first order logic is inherently a complex task; then, heuristics are needed to keep the problem to manageable size. In this paper we explore the effect of alternative search strategies, including the use of information gain and of a-priori knowledge, on the quality of the acquired relations, intended as the ability to reconstruct the rule used to generate the examples. To this aim, an artificial domain has been created, in which the experimental conditions can be kept under control, the “solulion” of the learning problem is known and a perfect theory is available. Another investigated aspect is the impact of more complex description languages, such as, for instance, including numerical quantifiers. The resultS show that the information gain criterion is too greedy to be useful when the concepts have a complex internal structure; however, this drawback is more or less shared with any purely statistical evaluation criterion. The addition of parts of the available domain theory increases the obtained performance level. Similar results have been previously obtained on a number of real applications and of test-cases taken from standard machine learning data bases.

scholarly journals Estimation of Critical Uncertainty Sources in Discharge Measurements using Controlled Experimental Conditions

2018 ◽  
Vol 40 ◽  
pp. 06046
Author(s):  
Dongsu Kim ◽  
Aurélien Despax ◽  
Marian Muste ◽  
Jérôme Le Coz
Keyword(s):  
Acoustic Doppler Velocimeter ◽  
Experimental Facility ◽  
Experimental Conditions ◽  
Uncertainty Sources ◽  
Wide Range ◽  
Discharge Estimation ◽  
Sampling Duration ◽  
The Impact ◽  
Natural Scale

Providing experimental results along with associated uncertainties is essential not only for ensuring confidence in the quality of the final results but also for guiding improved instrument design and the protocols for measurement acquisition. Moreover, if the uncertainty analysis is conducted in a controlled manner and over a wide range for the measured variables its results can serve as a decision-making aid in conducting new experiments. This paper provides three examples of end-to-end assessments of the impact of uncertainty sources involved in the discharge estimation in open channels using point velocities measured with Acoustic Doppler Velocimeter. The analyzed uncertainty sources are: a) the sampling duration for velocity measurement, b) the number of points in the verticals, and, c) the number of verticals across the measurement cross-section. The raw data for the uncertainty estimations were acquired at the KICT River Experiment Center (South Korea), an experimental facility designed for facilitiating quasi natural-scale experiments. The three sources of uncertainties are assembled in practical visualization means that can be used for planning the acquisition of new experiments with similar instruments.

scholarly journals Compression test of cold-formedsteel perforated profile with steel sheathing

Vestnik MGSU ◽  
2015 ◽  
pp. 43-52
Author(s):  
Aleksandr Yur’evich Shamanin
Keyword(s):  
Cross Sections ◽  
Oriented Strand Board ◽  
Axial Deformation ◽  
Plastic Properties ◽  
Steel Columns ◽  
Central Column ◽  
Series Of Experiments ◽  
The Stability ◽  
The Impact ◽  
Different Thickness

The subject of this paper is the stability and strength of cold-formed and perforated steel sigma-section columns with steel sheathing of different thickness. Ceilings with and without steel sheathing of different thickness are tested to failure in compression on a laboratory machine, which was based on a manual hydraulic jack. Series of 4 experiments with full-scale walls (2.5 m height) were carried out. Also, for examination of the role of boundary conditions, the sheet in a ceiling is either left free or connected to base with screws.In civil engineering there are many experiments and methodologies for calculating the strength and buckling of ceiling with the sheathing of various materials, such as oriented strand board and gypsum board. However, for producing superstructures of ships the materials with high plastic properties and strength characteristics are required. For example steel possesses such properties. It was the main reason for conducting a series of experiments and studying the behavior of cold-formed steel columns with steel sheathing. During the experiments the deformation of the cross-section of three equally spaced cross sections was determined, as well as the axial deformation of the central column in the ceiling with steel sheathing.The test results showed the influence of the thickness of sheathing and boundary condition of a sheet on the strength and buckling of ceiling. According to the results of the tests it is necessary to evaluate the impact of the sheathing made of different materials and if necessary to carry out further tests.

scholarly journals Pulse Ultrasonic Cure Monitoring of the Pultrusion Process

2018 ◽  
Author(s):  
Patrick Scholle ◽  
Michael Sinapius
Keyword(s):  
Carbon Fiber ◽  
Cross Sections ◽  
Ultrasonic Transducers ◽  
Adhesively Bonded ◽  
Carbon Fiber Reinforced Plastics ◽  
Pultrusion Process ◽  
Cure Monitoring ◽  
Reinforced Plastics ◽  
Series Of Experiments ◽  
Fiber Reinforced Plastics

This article discusses the results of a series of experiments on pulse ultrasonic cure monitoring of carbon fiber reinforced plastics applied to the pultrusion process. The aim of this study is to validate the hypothesis that pulse ultrasonic cure monitoring can be applied a) for profiles having small cross sections such as 7x0.5 mm and b) within the environment of the pultrusion process. Ultrasonic transducers are adhesively bonded to the pultrusion tool as actuators and sensors. The time-of-flight and the amplitude of an ultrasonic wave are analyzed to deduce the current curing state of the epoxy matrix. The experimental results show that ultrasonic cure monitoring is indeed applicable even to very thin cross sections. However, significant challenges can be reported when the techniques are used during the pultrusion process.

On the impact of architecture design decisions on the quality of blockchain-based applications

2020 ◽  
Vol 35 ◽  
Author(s):  
Diego Marmsoler ◽  
Leo Eichhorn
Keyword(s):  
Architectural Design ◽  
Development Process ◽  
Quality Attributes ◽  
Software Architectures ◽  
Simulation Environment ◽  
Design Decisions ◽  
Simulation Based ◽  
Series Of Experiments ◽  
The Impact

Abstract In software architectures, architectural design decisions (ADDs) strongly influence the quality of the resulting software system. Wrong decisions lead to low-quality systems and are difficult to repair later on in the development process. As of today, little is known about the impact of certain ADDs for the development of architectures for blockchain-based systems. Thus, it is difficult to predict the outcome of certain ADDs when developing architectures for such systems. In the following, we propose a simulation-based approach for blockchain architectures in which the impact of certain ADDs on certain quality attributes can be simulated. To this end, we first implemented a simulation environment for blockchain architectures. The simulation environment was then used to execute a series of experiments from which we derived a set of hypotheses about the impact of certain ADDs on quality attributes for blockchain architectures. Finally, we tested the hypotheses using statistical analyses and derived an empirical model for blockchain architectures based on the outcome of the analysis. The model can be used by architects to predict the effect of certain decisions in the design of blockchain architectures before implementing them.

The influence of collecting date, temperature and moisture regimes on the germination of epiphytic bromeliads

2014 ◽  
Vol 24 (4) ◽  
pp. 353-363 ◽  
Author(s):  
Siouxsie Correa ◽  
Gerhard Zotz
Keyword(s):  
Consistent Difference ◽  
Spatial And Temporal Patterns ◽  
Experimental Conditions ◽  
Vascular Epiphytes ◽  
Temperature Regimes ◽  
Epiphyte Communities ◽  
Ecological Realism ◽  
Series Of Experiments ◽  
The Impact ◽  
Fluctuating Temperatures

AbstractThe understanding that many aspects of the spatial and temporal patterns of epiphyte communities may be explained by the comportment of early life stages has given rise to a considerable number of germination studies in recent years. Unfortunately, protocols frequently use unproven assumptions and arbitrary experimental conditions. To make future studies as ecologically meaningful as possible we address a number of potential pitfalls with a series of experiments with seeds from a total of 16 species. We show that it is safe to collect capsules for experiments before natural dehiscence – there is afterripening even in the case of very early collections. The application of fluctuating temperatures is not imperative, because there is no consistent difference in the germination response under constant versus fluctuating temperatures. The effects of different osmotic potentials and intermittent drought of varying intensity on germination are qualitatively, but not quantitatively, comparable. Due to the greater ecological realism, we encourage the use of the latter. However, care must be taken to use realistic temperatures – the impact of intermittent drought on germination is modulated by temperature. This highlights the need for data on the in situ temperature regimes during germination as an important prerequisite towards more realistic experiments in the field of germination ecology of vascular epiphytes.

Experimental Research on Impact Line of Hyperboloid Shallow Shell

2010 ◽  
Vol 139-141 ◽  
pp. 567-570
Author(s):  
Li Hong Zhao ◽  
Zheng Yi Ren ◽  
Shu Yong Jiang ◽  
Nan Yang
Keyword(s):  
Process Conditions ◽  
Forming Process ◽  
Shape Accuracy ◽  
Test Analysis ◽  
Shallow Shells ◽  
Blank Holding Force ◽  
Auto Body ◽  
Design And Manufacture ◽  
The Impact

Impact line is one of important factors to affect the shape accuracy and surface quality of auto body panel design and manufacture. It is difficult to study because of the complexity shape of auto body panels. The system of test analysis on impact line is established by analyzing the shapes and forming processes of auto-body panels, of which based on hyperboloid shallow shells. The criterion and research technique of impact line are introduced. Extensive experiment results, which show the effects of forming process conditions, such as blank holding force, draw bead arrangement, and lubrication on impact line, are achieved. It can be concluded that the draw bead arrangement significantly influence the impact line, the displacement of impact line is different with difference of blank holding force and the friction coefficient.

Homogeneity of Aluminum Castings and Dependency on Increasing Pressure

2015 ◽  
Vol 669 ◽  
pp. 134-141
Author(s):  
Stefan Gaspar ◽  
Jan Pasko
Keyword(s):  
Automobile Industry ◽  
Die Casting ◽  
Mold Temperature ◽  
Melt Temperature ◽  
Aluminum Castings ◽  
Number Of Factors ◽  
Die Cast ◽  
Die Castings ◽  
The Impact

The production of die castings cast into a metal mold has in recent years achieved an expansive growth in the volume as well as the range of production and that is particularly in aviation and automobile industry. In the process of die casting the final quality of a cast is influenced by a great number of factors. The main factors of die casting are: pressing velocity, increase pressure, the melt temperature and the mold temperature. A primary criterion for achieving reliability, efficiency and quality of production is to ensure minimization of the castings defects occurrence in castings correct setting technological factors of die casting. The presented paper deals with the experimental assessment of the impact of increase pressure on the mechanical properties and homogeneity of a die cast.

scholarly journals Optimization of Production Parameters in Oriented Strand Board (OSB) Manufacturing by Using Taguchi Method

2021 ◽  
Vol 72 (4) ◽  
pp. 347-352
Author(s):  
Ahad Furugi ◽  
Fatih Yapici
Keyword(s):  
Taguchi Method ◽  
Oriented Strand Board ◽  
Orthogonal Design ◽  
Process Conditions ◽  
Taguchi Technique ◽  
Effective Parameters ◽  
Pressure Time ◽  
Verification Test ◽  
The Impact

Optimization of process conditions in oriented strand board (OSB) manufacturing is a very important issue for both reducing cost and improving the quality of panels. Taguchi experimental design technique was applied to determination and optimization of the most influential controlling parameters of OSB panels such as press condition (pressure-time-temperature) and the ratio of adhesive parameters on modulus of elasticity (MOE). The value of the MOE is one of the very important mechanical properties of OSB panels. For this purpose, several experiments were conducted according to Taguchi L27 orthogonal design. The signal-to-noise (S/N) and the analysis of variance (ANOVA) were used to find the optimum levels and to indicate the impact of the controlling parameters on MOE. A verification test was also performed to prove the effectiveness of Taguchi technique. Since the predicted and the measured values were very close to each other, it was concluded that the Taguchi method was very successful in the optimization of effective parameters in OSB’s manufacturing.

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