scholarly journals The Possibilities of Improving the Fatigue Durability of the Ship Propeller Shaft by Burnishing Process

Machines ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 63
Author(s):  
Stefan Dzionk ◽  
Włodzimierz Przybylski ◽  
Bogdan Ścibiorski
Keyword(s):  
Fatigue Strength ◽  
Cold Rolling ◽  
Processing Parameters ◽  
Numerical Control ◽  
Automatic Process ◽  
Structural Elements ◽  
Fatigue Durability ◽  
Burnishing Process ◽  
Seawater Environment ◽  
Ship Propeller

Heavily loaded structural elements operating in a corrosive environment are usually quickly destroyed. An example of such an element is a ship propeller operating in a seawater environment. This research presents a fatigue resistance test performed on elements operating in seawater. Different processing parameters applied on the samples in particular were compared with the specimens whose surface had been burnished differently and they were compared to specimens with a grinded surface. The research shows that the structural elements whose surface has been burnished can have up to 30% higher fatigue strength in a seawater environment than the elements whose surface has been grinded. During burnishing, an important feature of the process is the degree of cold rolling of the material. The resistance of the component to fatigue loads increases only to a certain level with increasing the degree of the cold rolling. Further increasing the degree of cold rolling reduces the fatigue strength. Introducing additional stresses in the components (e.g., assembly stresses) reduces the fatigue strength of this component in operation and these additional stresses should be accounted for while planning the degree of the cold rolling value. A device that allows for simultaneous turning and shaft burnishing with high slenderness is presented in the appendix of this article. This device can be connected to the computerized numerical control system and executed automatic process according to the machining program; this solution reduces the number of operations and cost in the process.

scholarly journals The influence of Mg and Mn content on abnormal grain growth in AA5182 type alloys

10.30544/463 ◽  
2020 ◽  
Vol 25 (04) ◽  
pp. 315-323
Author(s):  
Tamara Radetić ◽  
Miljana Popović ◽  
Bojan Gligorijević ◽  
Ana Alil ◽  
Endre Romhanji
Keyword(s):  
Cold Rolling ◽  
Grain Growth ◽  
Processing Parameters ◽  
Abnormal Grain Growth ◽  
Strong Anisotropy ◽  
Grain Boundary Mobility ◽  
Zener Pinning ◽  
Cold Rolling Reduction ◽  
Mn Content ◽  
Aa5182 Alloy

The occurrence of abnormal grain growth (AGG) in AA5182 alloy during annealing imposes severe restrictions on processing parameters and deteriorates mechanical properties. In this work, we investigated the effect of chemical composition on the appearance of abnormal grain growth by varying Mg and Mn content in the range of composition limits for standard AA5182 alloy, 4.0-5.0% Mg, and 0.2-0.5% Mn, respectively. Thermo-mechanical processing of alloys included cold rolling with reductions ranging from 40 to 85%, followed by annealing in the temperature range from 350 to 520 °C. The results showed that the rise in alloying elements content drives the onset of abnormal grain growth toward higher temperatures. The increase in the cold rolling reduction degree promotes abnormal grain growth and lowers its onset temperature. Abnormal grain growth and grain boundary mobility showed strong anisotropy related to rod-like shape and alignment of Al6Mn(Fe) dispersoids through Zener pinning.

Texture Evolution and Earing in Aluminium Can Sheet

2005 ◽  
Vol 495-497 ◽  
pp. 1565-1572 ◽  
Author(s):  
Jürgen Hirsch
Keyword(s):  
Fourier Series ◽  
Cold Rolling ◽  
Series Expansion ◽  
Deep Drawing ◽  
Recrystallization Texture ◽  
Texture Evolution ◽  
Processing Parameters ◽  
New Method ◽  
Fourier Series Expansion ◽  
Hot And Cold Rolling

The texture evolution during hot and cold rolling of AlMg1Mn1 can body sheet is described and the related anisotropy effects during deep drawing are analysed quantitatively. The typical textures of rolled aluminium show the transition between ß-fibre orientations and cube recrystallization texture, depending on rolling temperature and strain. These correlate with transitions between 45° and 0°/90° ear heights in deep drawn cups which are described by a new method of Fourier series expansion. Processing parameters to achieve low anisotropy are discussed.

Data Mining for Estimating Fatigue Strength Based on Composition and Process Parameters

2019 ◽  
Author(s):  
Arvind Keprate ◽  
R. M. Chandima Ratnayake
Keyword(s):  
Data Mining ◽  
Fatigue Strength ◽  
Process Parameters ◽  
Fatigue Testing ◽  
Absolute Error ◽  
Processing Parameters ◽  
Coefficient Of Determination ◽  
Low Alloy Steels ◽  
Strength Based ◽  
Alloy Steels

Abstract Accurately estimating the fatigue strength of steels is vital, due to the extremely high cost (and time) of fatigue testing and often fatal consequences of fatigue failures. The main objective of this manuscript is to perform data mining on the fatigue dataset for steel available from the National Institute of Material Science (NIMS) MatNavi. The cross-industry process for data mining (CRISP-DM) approach was followed in the paper, in order to gain meaningful insights from the dataset and to estimate the fatigue strength of carbon and low alloy steels, using composition and processing parameters. Of the six steps of the CRISP-DM approach, special emphasis has been placed on steps 2 to 5 (i.e. data understanding, data preparation, modeling and evaluation). In step 4 (i.e. modeling), a range of machine learning (parametric and non-parametric) is explored to predict the fatigue strength, based on the composition and process parameters. Various algorithms were trained and tested on the dataset and finally evaluated, using metrics such as root mean square error (RMSE), Mean Absolute Error (MAE), Coefficient of Determination (R2) and Explained Variance Score (EVS).

Semi-automatic Process for Hybrid DTM Generalization based on Structural Elements Multi-analysis

2009 ◽  
Vol 46 (2) ◽  
pp. 146-154 ◽  
Author(s):  
María Teresa Martín ◽  
Jaime Rodríguez ◽  
Jesús Irigoyen ◽  
José Carlos Martínez-Llario ◽  
Pedro Arias
Keyword(s):  
Automatic Process ◽  
Structural Elements

scholarly journals Biocompuestos para perfiles avanzados adaptados a la edificación = Biocomposites for Advanced Profiles Adapted to Building Envelope

2016 ◽  
Vol 2 (1) ◽  
pp. 20
Author(s):  
I. Roig ◽  
S. Fita ◽  
O. Menes ◽  
N. Soriano
Keyword(s):  
Modular Design ◽  
State Of The Art ◽  
Processing Parameters ◽  
Building Envelope ◽  
Integrated System ◽  
Natural Fibres ◽  
Structural Elements ◽  
Building Envelopes ◽  
Natural Materials ◽  
Partition Walls

Resumen Compuestos alternativos en el sector de la envolvente se obtienen por extrusión de estirado de secciones y perfiles de panel de enclavamiento estrechas. Estos elementos estructurales, resistentes al impacto, tienen la ventaja de una instalación más rápida y segura, y su diseño modular les hace idóneos para muchos edificios y otras aplicaciones. Un desarrollo adicional en esta área puede ser la obtención de una alternativa sostenible a los perfiles compuestos actuales. Estudios anteriores han demostrado que los compuestos fabricados a partir de materiales naturales tales como fibras y polímeros bio-derivados, ofrecen una alternativa sostenible a los polímeros y materiales compuestos tradicionales. El objetivo de este desarrollo es reemplazar el típico perfil de acero ligero. Los perfiles de acabado también se pueden utilizar para terminar tabiques de mampostería existentes, revestimiento de ejes mecánicos y de extracción y revestimiento de la columna. Los perfiles se han diseñado utilizando bio-polímeros, reforzados con fibras naturales. Se han establecido los parámetros de procesamiento y las formulaciones apropiadas de bioresina y fibras naturales. También se ha evaluado la adaptación de las técnicas de procesamiento de pultrusión existentes a las características concretas de los nuevos biomateriales y fibras naturales. Como resultado, los perfiles de pultrusión adaptados a la construcción se han desarrollado con la incorporación de nuevos materiales y biomateriales basados en resina.Abstract An alternative composites answer in the envelope sector is the fabrication by pultrusion of narrow interlocking panel sections and profiles. These impact-resistant structural elements have the advantage of quicker, safer installation and their modular design equally answers many identical building and other applications¡Error! No se encuentra el origen de la referencia.. An additional development in this area can be the obtaining of a sustainable alternative to current composite profiles. Previous studies have shown that biocomposites manufactured from natural materials such as fibres and bio-derived polymers; offer a sustainable alternative to traditional polymers and composites. The goal of this development is to replace the typical light gauge steel profile with a state of the art bio-composite integrated system. The finish profiles can also be used to finish existing masonry partition walls, cladding mechanical and extraction shafts and column cladding. The profiles have been designed using bio-polymers, reinforced with natural fibres where possible and necessary. Proper formulations of the bioresin, natural fibres and processing parameters have been established. The adaptation of the existing processing pultrusion techniques to the specific characteristics of the new biomaterials and natural fibres has been also assessed. As a result, demonstrators of pultrusion profiles adapted to building envelopes have been carried out incorporating novel materials and bio based resin. 

scholarly journals Combination of Acoustic Emission and Vibratory Measurements to Characterize an Ultrasonic Vibration Assisted Ball Burnishing Tool for a Lathe

2021 ◽  
Author(s):  
Ismael Fernández-Osete ◽  
Aida Estevez-Urra ◽  
Eric Velázquez-Corral ◽  
David Valentin ◽  
Jordi Llumà ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Ultrasonic Vibration ◽  
Numerical Control ◽  
Resonance Problem ◽  
Ultrasonic Frequency ◽  
Ball Burnishing ◽  
Burnishing Process ◽  
Vibration Assistance ◽  
Low Amplitude

In this paper, a resonant system that produces a movement of low amplitude and ultrasonic frequency is used to achieve the vibration assistance in a ball-burnishing process. A full vibration characterization of this process performed in a lathe was done. It is carried out by a new tool designed in the research group of the authors. Its purpose is to demonstrate that the machine and the tool do not have any resonance problem during the process and to prevent possible failures. The analysis of this dynamic behaviour permits to validate the suitability of the tool when it is anchored to a numerical control lathe. This is very important for its future industrial implementation. It is also intended to confirm that the system adequately transmits vibrations through the material. To do this, a methodology to validate the dynamic tool behaviour was developed. Several techniques that combine the usual and ultrasonic vibration ranges through static and dynamic measurements were merged: vibration and acoustic emission measurements. An operational deflection shape (ODS) exercise has been also performed. Results show the suitability of the tool used to transmit the assistance vibrations, and that no damage is produced in the material in any case.

scholarly journals A Model of Surface Residual Stress Distribution of Cold Rolling Spline

2017 ◽  
Vol 2017 ◽  
pp. 1-21 ◽  
Author(s):  
Z. H. Ding ◽  
F. K. Cui ◽  
Y. B. Liu ◽  
Y. Li ◽  
K. G. Xie
Keyword(s):  
Residual Stress ◽  
Cold Rolling ◽  
High Reliability ◽  
Processing Parameters ◽  
Multiple Regression Model ◽  
Tooth Profile ◽  
Contour Method ◽  
Forming Process ◽  
Surface Residual Stress ◽  
Cold Roll

Residual stress is an important parameter in the evaluation of the performance of a cold rolling spline surface. However, research on cold rolling spline is rare. To improve the surface property of a spline, an involute spline is selected as the object of this study. The contour method for determining cold roll-beating residual stress involves measuring the force spatial distribution, performing a statistical analysis of the experimental results, establishing the parameters for the tooth profile for different positions (dedendum, pitch, and addendum) of residual stress, and determining the effect of pressure on the relationship between stress and the depth of the cold roll-beating. A response surface method is used to establish the spline tooth profile of the dedendum, pitch, and addendum of the residual stress and different depths of the stress layer to obtain the parameters of a multiple regression model and perform a comparative analysis of the experimental and prediction results. Research indicates that the prediction results have high reliability. The establishment of this model has important guiding significance to control the residual stress in the cold roll-beating forming process, optimize the cold roll-beating processing parameters, and improve the surface properties of cold rolling spline.

Sign in / Sign up

Export Citation Format

Share Document