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= Fatigue of a Welded Joint (DRAFT) = |
= Fatigue of a Welded Joint (DRAFT) = |
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[[Welding]] is a manufacturing method used to join various materials together to form an assembly. During welding, joints are formed between two separate pieces of material. If this welded joint is subjected to cyclic loading, failure due to fatigue could result.<ref name=":0" /> Throughout a welded assemblies life, cracks could initiate, propagate, and grow causing the assembly to fail even if these cyclic stresses are low and |
[[Welding]] is a manufacturing method used to join various materials together to form an assembly. During welding, joints are formed between two or more separate pieces of material. If this welded joint is subjected to cyclic loading, failure due to fatigue could result.<ref name=":0" /> Throughout a welded assemblies life, cracks could initiate, propagate, and grow causing the assembly to fail even if these cyclic stresses are low and smaller than the base material and weld filler material yield stress.<ref name=":0" /> Hence, the fatigue strength of a the welded joint does not correlate to the fatigue strength of the base material.<ref name=":0" /> Incorporating design rules in the development phase can reduce failures due to fatigue in welded joints.<ref>{{Cite journal|last=Maddox|first=Stephen|date=January/March 2000|title=Fatigue Design Ruled for Welded Structures|url=http://onlinelibrary.wiley.com/wol1/doi/10.1002/(SICI)1528-2716(200001/03)2:1%3C102::AID-PSE12%3E3.0.CO;2-A/abstract|journal=Progress in Structural Engineering and Materials|volume=2, Issue 1|pages=102-109|via=John Wiley & Sons, Ltd.}}</ref> |
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Brief Introduction<ref>{{Cite journal|last=Maddox|first=Stephen|date=January/March 2000|title=Fatigue Design Ruled for Welded Structures|url=http://onlinelibrary.wiley.com/wol1/doi/10.1002/(SICI)1528-2716(200001/03)2:1%3C102::AID-PSE12%3E3.0.CO;2-A/abstract|journal=Progress in Structural Engineering and Materials|volume=2, Issue 1|pages=102-109|via=John Wiley & Sons, Ltd.}}</ref> |
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Links to fatigue |
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== Calculations and S-N Curves == |
== Calculations and S-N Curves == |
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Nominal Stress vs. Endurance (Number of Cycles) |
Nominal Stress vs. Endurance (Number of Cycles) |
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Types |
Types |
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== Fatigue Design Rules == |
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=== Welding Residual Stresses === |
=== Welding Residual Stresses === |
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Revision as of 22:34, 5 November 2017
Article Evaluation (Week 3)
Article Chosen: Conductive Heat Transfer
- Is everything in the article relevant to the article topic? Is there anything that distracted you?
- I would agree that everything in this article is relevant to the topic however I was distracted a little bit when the article spoke about detailed classifications in regards to smooth and solid surfaces.
- Is the article neutral? Are there any claims, or frames, that appear heavily biased toward a particular position?
- No, the article appears neutral to me.
- Are there viewpoints that are overrepresented, or underrepresented?
- I feel like the Free or Natural convection section went into a little more detail than the forced convection section.
- Check a few citations. Do the links work? Does the source support the claims in the article?
- The links do work and the items that I could check seem to support the article.
- Is each fact referenced with an appropriate, reliable reference? Where does the information come from? Are these neutral sources? If biased, is that bias noted?
- No not all of the facts are referenced however some are. The sources appear to be neutral.
- Is any information out of date? Is anything missing that could be added?
- No I feel the article encompass everything as far as my knowledge.
- Check out the Talk page of the article. What kinds of conversations, if any, are going on behind the scenes about how to represent this topic?
- There are a lot of conversations going on behind the scenes. Some back and fourth in regards to the opening paragraph and definition of convection.
- How is the article rated? Is it a part of any WikiProjects?
- The project is rated as Start-Class and is within scope of the WikiProject Meteorology.
- How does the way Wikipedia discusses this topic differ from the way we've talked about it in class?
- This article goes a lot deeper than our classroom discussions but not in a bad way. What we have leaned in class is just relevant to the welding topic.
Potential Topics (Week 4)
Fatigue of a Welded Joint
I was not able to find information regarding fatigue of a welded joint. Ideally this would be a subheading under the Welded Joint page. I would be able to speak a little but about metallurgy plus information which will be presented in lecture on 11/29.
Welding Distortion
I was not able to find any information on this topic either in Wikipedia. This may be a topic in itself where as my previous topic would be an add on. I would be able to link some topics such as Welding and Distortion. I do not have many sources on this topic to they will have to be researched but it is a fairly well known topic within manufacturing. We have not covered this topic in class but it is coming. I have discussed it in other classes as well as in application at work/industry.
Thermal Conduction
Thermal Conduction subheading "Applications" can be updated to include welding. Here we can expand a little but from the earlier portion of class and how it applies to welding and review various papers/studies.
Welding Cooling Rate
This may be a good topic because it is not represented on Wikipedia, however I do not have any good references other than class notes at this time so I will keep this as a low priority.
Instructor Comments
Adding an article on fatigue of welded joints would be excellent.
Fatigue of a Welded Joint (DRAFT)
Welding is a manufacturing method used to join various materials together to form an assembly. During welding, joints are formed between two or more separate pieces of material. If this welded joint is subjected to cyclic loading, failure due to fatigue could result.[1] Throughout a welded assemblies life, cracks could initiate, propagate, and grow causing the assembly to fail even if these cyclic stresses are low and smaller than the base material and weld filler material yield stress.[1] Hence, the fatigue strength of a the welded joint does not correlate to the fatigue strength of the base material.[1] Incorporating design rules in the development phase can reduce failures due to fatigue in welded joints.[2]
Calculations and S-N Curves
Nominal Stress vs. Endurance (Number of Cycles)
Obtained from statistical analysis and experimental data.
Fatigue Limit (5-10 million cycles)
Classification System:
- Joint Type
- Weld Geometry
- Loading Direction
- Mode of fatigue cracking
Types
Fatigue Design Rules
Welding Residual Stresses
Member Thickness
Material Type
Welding Process
Surrounding Environment
Prevention
Finite Element Analysis
- ^ a b c d Tom., Lassen, (2013). Fatigue Life Analyses of Welded Structures : Flaws. Récho, Naman. Somerset: Wiley. ISBN 9781118614709. OCLC 929525641.
{{cite book}}: CS1 maint: extra punctuation (link) CS1 maint: multiple names: authors list (link) - ^ Maddox, Stephen (January/March 2000). "Fatigue Design Ruled for Welded Structures". Progress in Structural Engineering and Materials. 2, Issue 1: 102–109 – via John Wiley & Sons, Ltd.
{{cite journal}}: Check date values in:|date=(help) - ^ Khatib, Hamza (2016). "Using an Experimental Approach Based on Static Characterization Tests" (PDF). Contemporary Engineering Scienves. 9, no. 11: 513–530 – via Hikari Ltd.
- ^ Martin, T. "Fatigue Design of Welded Joints Using the Finite Element Method and the 2007 ASME Div. 2 Master Curve". Department of Industrial Engineering, University of Pharma (Italy).