alexa Software for Optimizing Stop Hole Shape | OMICS International
ISSN: 2168-9873
Journal of Applied Mechanical Engineering
Make the best use of Scientific Research and information from our 700+ peer reviewed, Open Access Journals that operates with the help of 50,000+ Editorial Board Members and esteemed reviewers and 1000+ Scientific associations in Medical, Clinical, Pharmaceutical, Engineering, Technology and Management Fields.
Meet Inspiring Speakers and Experts at our 3000+ Global Conferenceseries Events with over 600+ Conferences, 1200+ Symposiums and 1200+ Workshops on
Medical, Pharma, Engineering, Science, Technology and Business

Software for Optimizing Stop Hole Shape

Awad M*
Department of Production Engineering and Mechanical Design, Mansoura University, Egypt
Corresponding Author : Awad M
PhD in Production Engineering and Mechanical Design
Mansoura University, Egypt
Tel: +20 50 2244426
E-mail: [email protected]
Received: June 16, 2015 Accepted: August 18, 2015 Published: August 27, 2015
Citation: Awad M (2015) Software for Optimizing Stop Hole Shape. J Appl Mech Eng 4:176. doi:10.4172/2168-9873.1000176
Copyright: © 2015 Awad M. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Related article at Pubmed, Scholar Google

Visit for more related articles at Journal of Applied Mechanical Engineering

Abstract

The stop-hole method is investigated previously with creating a non-circular hole. That hole defines as an optimum stop hole shape that gives maximum initial fatigue life. Optimum stop hole shape decreases stress concentration without increasing the nominal stress, by using optimization technique. The effect of this optimum hole shape on crack reinitiating life for different model geometries is studied. The aim of this work is to introduce a software program to make it easy for everybody to determine optimum shape of stop hole suitable for user’s geometry. This program is called OHS (Optimum Hole Shape). The input of that program will be only the specimen width, length, and crack length in addition to applied load. Then OHS outputs global optimum hole shape parameters. The optimum hole shape for different models are saved as database for OHS program. OHS can be linked directly with EDM machines to create optimum hole with one click.

Keywords
Optimization; Optimum stop hole shape; MATLAB GUI
Introduction
Design optimization using finite element analysis procedures is not a new idea [1-7]. The development of a numerical technique to compute initial fatigue life taking into account the material mechanical properties and true local stresses and strains by using the analysis results from a created nonlinear model was been studied by Fanni [8]. This work aims to introduce a complete software to give the user the ability to design the optimum stop hole shape considering his case without doing any complex optimization programs. The user needs only to apply geometrical configuration of his specimen and the mechanical properties of specimen material to OHS in order to get the optimum hole shape that gives maximum crack reinitiation life.
Modeling and Methodology
Finite element analysis and optimization programs
In order to get the required database for OHS software, forty two different models are studied. These models are sorted according to the (crack length/specimen width) ratio into eight groups. These groups are 0.1, 0.15, 0.2, 0.225, 0.3, and 0.344 for edge crack and two group for center crack with (crack length/specimen width) ratios 0.1 and 0.2. Each group consists of six different geometries with different (lengths/width) ratios 1, 1.2, 1.4, 1.6, 1.8, 2, and 3. For each specimen an elastoplastic finite element analysis is performed to determine maximum local stress/strain at circular stop hole boundary. The circular stop hole is the initial shape of stop hole that will be changed during optimization process. To save simulation time half model is studied. The stop hole is modeled by a spline connecting seven points distributed at hole boundary at constant angular distance equal to 30 degree. Every point of that spline is defined by angular coordinate (θ ) which is held constant during optimization program, and radial coordinate (R) which will be changed during optimization program. Then an optimization program is performed to obtain the optimum hole shape to reduce these maximum stress/strain values without increasing stop hole size. The shapes of these models are saved as a database of OHS software. The optimum hole shape is saved in the OHS as a contour connecting seven points with polar coordinates (R,θ ) . For example the first group is illustrated in Figures 1 and 2.
OHS software
MATLAB GUI is used to design OHS. The program is performed through two stages. The first stage calculates the circular stop hole needed to arrest that cracks according to formulas of Dexter [9] equation (1):
image             (1)
image             (2)
Where: Δσ is the range of applied stress σy is material yield stress (MPa), a is crack length, and R is circular stop hole radius.
The OHS asked user to input crack length, applied stress range and material yield stress. The OHS outputs the hole diameter D which is calculated internally by OHS using equations (1,2). The second stage of OHS selects the appropriate optimum hole shape for the user from the saved data. In this stage OHS asks user to input specimen configuration (width and length). According to specimen configuration OHS selects hole shape from saved data then mapping it with calculated diameter of circular hole. A screen shot of OHS program run is illustrated in Figure 3.
Conclusion
OHS simplifies the complex optimization programming and give the user the opportunity to get optimum hole shape within several seconds instead of performing optimization programs which take 8 hours at least. OHS is a collection of forty two complete optimization program for different models which could be sufficient to cover most kind of specimen and that save a lot of many and times consumed in optimization programs. OHS could be easily connected to CNC or EDM machines to create optimum hole shape just in time.
References









Figures at a glance

Figure Figure Figure
Figure 1 Figure 2 Figure 3
Select your language of interest to view the total content in your interested language
Post your comment

Share This Article

Relevant Topics

Recommended Conferences

Article Usage

  • Total views: 11767
  • [From(publication date):
    August-2015 - Sep 26, 2018]
  • Breakdown by view type
  • HTML page views : 7972
  • PDF downloads : 3795
 

Post your comment

captcha   Reload  Can't read the image? click here to refresh

Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2018-19
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

bornova escort

Datta A

[email protected]

1-702-714-7001Extn: 9037

Business & Management Journals

Ronald

[email protected]

1-702-714-7001Extn: 9042

Chemistry Journals

Gabriel Shaw

[email protected]

1-702-714-7001Extn: 9040

Clinical Journals

Datta A

[email protected]

1-702-714-7001Extn: 9037

Engineering Journals

James Franklin

[email protected]

1-702-714-7001Extn: 9042

Food & Nutrition Journals

Katie Wilson

[email protected]

1-702-714-7001Extn: 9042

General Science

Andrea Jason

[email protected]

1-702-714-7001Extn: 9043

Genetics & Molecular Biology Journals

Anna Melissa

[email protected]

1-702-714-7001Extn: 9006

Immunology & Microbiology Journals

David Gorantl

[email protected]

1-702-714-7001Extn: 9014

Materials Science Journals

Rachle Green

[email protected]

1-702-714-7001Extn: 9039

Nursing & Health Care Journals

Stephanie Skinner

[email protected]

1-702-714-7001Extn: 9039

Medical Journals

Nimmi Anna

[email protected]

1-702-714-7001Extn: 9038

Neuroscience & Psychology Journals

Nathan T

[email protected]

1-702-714-7001Extn: 9041

Pharmaceutical Sciences Journals

Ann Jose

[email protected]

1-702-714-7001Extn: 9007

Social & Political Science Journals

https://www.gaziantepescort.info

Steve Harry

[email protected]

1-702-714-7001Extn: 9042

 
© 2008- 2018 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version