iMechanica - Cyclic Plasticity
https://imechanica.org/taxonomy/term/2520
enNew Book in Cyclic Plasticity of Metals
https://imechanica.org/node/25615
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/128">education</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/12484">metal plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/169">Plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span><strong>New book: </strong><strong>Cyclic Plasticity of Metals: </strong><strong>Modeling Fundamentals and Applications (published by Elsevier)</strong></span>
</p><p><a href="https://www.elsevier.com/books/cyclic-plasticity-of-metals/roostaei/978-0-12-819293-1">https://www.elsevier.com/books/cyclic-plasticity-of-metals/roostaei/978-0-12-819293-1</a></p>
<p> </p>
<p>Table of Contents:</p>
<p><em><strong>Part One: Introduction</strong></em></p>
<p>1 Experimental observations in cyclic loading of metals</p>
<p>2 Fundamentals of cyclic plasticity models</p>
<p> </p>
<p><em><strong>Part Two: Cyclic plasticity models</strong></em></p>
<p>3 Multisurface cyclic plasticity</p>
<p>4 Two-surface cyclic plasticity</p>
<p>5 Nonlinear kinematic hardening cyclic plasticity</p>
<p>6 Distortional hardening cyclic plasticity</p>
<p>7 Computational methods for cyclic plasticity</p>
<p> </p>
<p><em><strong>Part Three: Applications of cyclic plasticity</strong></em></p>
<p>8 Cyclic plasticity applied to the notch analysis of metals</p>
<p>9 Application of cyclic plasticity for modeling ratcheting in metals</p>
<p>10 Application of cyclic plasticity to fatigue modeling</p>
<p>11 Cyclic plasticity of additively manufactured metals</p>
</div></div></div>Sat, 04 Dec 2021 20:53:14 +0000kourousis25615 at https://imechanica.orghttps://imechanica.org/node/25615#commentshttps://imechanica.org/crss/node/25615Exploring the Low Cycle Fatigue Performance of FFF Steel 316L [Talk at AM Industry Summit]
https://imechanica.org/node/25326
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/74">conference</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1966">low cycle fatigue</a></div><div class="field-item odd"><a href="/taxonomy/term/5115">ultra low cycle fatigue</a></div><div class="field-item even"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/3568">additive manufacturing</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span><em>[Talk at AM Industry Summit, 03 August 2021]</em></span></p>
<p><span><strong>Exploring the Low Cycle Fatigue Performance of FFF Steel 316L</strong></span></p>
<p>This talk, at the <a href="https://event.asme.org/AMIndustrySummit">AM Industry Summit powered by ASME</a><span>,</span> will cover the findings from an ongoing investigation aiming to characterise the cyclic elastoplastic behaviour of fused filament fabricated (FFF) Steel 316L. The elastoplastic characteristics under stress and strain controlled loadings will be analysed for this material, in an attempt to understand the material's performance in low cycle fatigue (LCF) conditions. </p>
<p>Attendees will have the opportunity to learn how this popular fused filmanet fabrication (FFF) metal material performs under various cyclic loading histories. Practical considerations for the enhancement of the low cycle fatigue (LCF) performance will also be discussed.</p>
<p> </p>
<p>Use code AMSPK199 to get one of the free passes</p>
<p><a href="https://l.feathr.co/AMIndustry/August/2021/Speakers/Dr-Kyriakos-Kourousis">https://l.feathr.co/AMIndustry/August/2021/Speakers/Dr-Kyriakos-Kourousis</a></p>
</div></div></div>Tue, 20 Jul 2021 23:11:47 +0000kourousis25326 at https://imechanica.orghttps://imechanica.org/node/25326#commentshttps://imechanica.org/crss/node/25326SLM Ti-6Al-4V Plastic Anisotropy
https://imechanica.org/node/21356
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/5109">anisotropic plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/7060">1D plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/4948">titanium alloy</a></div><div class="field-item odd"><a href="/taxonomy/term/6863">Titanium</a></div><div class="field-item even"><a href="/taxonomy/term/3568">additive manufacturing</a></div><div class="field-item odd"><a href="/taxonomy/term/4371">SLM</a></div><div class="field-item even"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span><strong>Cyclic Plasticity and Microstructure of As-built SLM Ti-6Al-4V: The Effect of Build Orientation</strong></span></p>
<p>D. Agius, K.I. Kourousis, C. Wallbrink, T. Song</p>
<p><strong><em>Materials Science & Engineering: A (2017) -- </em></strong><strong>Free access to the full article available at: <a href="https://authors.elsevier.com/a/1VHXL_Ky~FZJ6H">https://authors.elsevier.com/a/1VHXL_Ky~FZJ6H</a></strong></p>
</div></div></div>Tue, 27 Jun 2017 16:31:26 +0000kourousis21356 at https://imechanica.orghttps://imechanica.org/node/21356#commentshttps://imechanica.org/crss/node/21356Is the study of Low Cycle Fatigue (LCF) and cyclic plasticity useful for biomedical metals?
https://imechanica.org/node/21268
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>I would like to open a discussion in relation to the following question:</p>
<p><span><em><strong>"Is the study of Low Cycle Fatigue (LCF) and cyclic plasticity useful for biomedical metals?"</strong></em><em><strong><br /></strong></em></span></p>
<p><span>It appears that there is some level of misunderstanding around this issue. Thus, I would be very interested to find out the views of iMechanica community engineers and researchers working on biomedical metals and applications (i.e. implants) on this.</span></p>
<p>In your responses, I would appreciate if you could state if you have previous/current experience-involvement in biomedical engineering.</p>
<p>Regards,</p>
<p><span>K Kourousis</span></p>
<p> </p>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/109">Ask iMechanica</a></div></div></div><div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/1399">biomedical materials</a></div><div class="field-item even"><a href="/taxonomy/term/1966">low cycle fatigue</a></div></div></div>Tue, 30 May 2017 21:14:08 +0000kourousis21268 at https://imechanica.orghttps://imechanica.org/node/21268#commentshttps://imechanica.org/crss/node/21268A Look at the as-built 3D Printed Titanium: Is there Space for Plasticity?
https://imechanica.org/node/19401
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/3568">additive manufacturing</a></div><div class="field-item even"><a href="/taxonomy/term/6863">Titanium</a></div><div class="field-item odd"><a href="/taxonomy/term/4948">titanium alloy</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><a href="https://www.linkedin.com/pulse/look-as-built-3d-printed-titanium-space-plasticity-kourousis-phd">https://www.linkedin.com/pulse/look-as-built-3d-printed-titanium-space-p...</a></p>
</div></div></div>Thu, 28 Jan 2016 21:33:52 +0000kourousis19401 at https://imechanica.orghttps://imechanica.org/node/19401#commentshttps://imechanica.org/crss/node/19401Isotropic hardening law
https://imechanica.org/node/16594
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/128">education</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/233">power law</a></div><div class="field-item odd"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/7061">isotropic hardening</a></div><div class="field-item odd"><a href="/taxonomy/term/9793">exponential law</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all,
</p>
<p>
I have come across the two relations where aim to describe the isotropic hardening of a material
</p>
<p>
Power law:
</p>
<p>
R = Kεpn R is the variation in stress from initial yield, εp is the plastic strain where K is the strenght coefficient and n is the strain hardening exponent as observed in Ramberg Osgood equations.
</p>
<p>
Exponential law:
</p>
<p>
R = R∞ [1-e(-bεp)] where R∞ is the saturated value of the R variation, b is the rate at which the sauration is reached.
</p>
<p>
</p>
<p>
From all the literature I have read on combined hardening I have seen that the authors have used the exponential law for the isotropic hardening when considering cycic plasticity. Does anyone know the reasoning of this?
</p>
<p>
Looking forward to your comments
</p>
</div></div></div>Tue, 13 May 2014 10:50:17 +0000felton199016594 at https://imechanica.orghttps://imechanica.org/node/16594#commentshttps://imechanica.org/crss/node/16594Prager's Hardening Rule
https://imechanica.org/node/16476
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/128">education</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/169">Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/9720">Kinematic Harderning</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all
</p>
<p>
I am currently investigating Prager hardening room which is stated as the simplist linear kinematic hardening rule. I was wondering if anyone has worked with this model and if so if you have managed to identify how to determine the constant used for the back stress equation
</p>
<p>
</p>
<p>
dα =C * dεp ( this is epsilon dot p which is the equivalent plastic strain)
</p>
<p>
</p>
<p>
Please can you let me know how to determine the constant C from experimental results?
</p>
</div></div></div>Fri, 25 Apr 2014 20:59:35 +0000felton199016476 at https://imechanica.orghttps://imechanica.org/node/16476#commentshttps://imechanica.org/crss/node/16476modelling cyclic plasticity in abaqus
https://imechanica.org/node/7246
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
</p>
<p>
I have to model cyclic plasticity in ABAQUS. The method to use ( this is as per ASME Boiler and Pressure Vessel code) involves only a single loading ( rather the load range has o be applied) and using a stabilized cyclic stress strain data expresssed in Ramberg Osgood format. The parameters for Ramberg Osgood are specified in the equation to be used fpr stabilized cyclic stress strain curve.
</p>
<p>
Implementing the same in ABAQUS, gives me the following possibilities :
</p>
<p>
</p>
<p>
1) Hardening type Isotropic-which I believe should not be used with cyclic loading.
</p>
<p>
</p>
<p>
2) Hardening type Kinematic -where only 2 data points can be given as input-thereby making the graph a bilinear one. The first data point is yield stress at zero plastic strain. I think I can use this model with the second data point computed using the Ramberg Osgood type equation provided in the code . However I feel that since this input is only for two points, it does not represent the data in adequate form.
</p>
<p>
</p>
<p>
3) Use combined hardening where kinematic and isotropic components can be specified independently.In this option, the no. of data points for kinematic hardening is no longer confied to 2 points , thereby making the graph a nonlinear one. I think I can use the Ramberg Osgood type relationship from the code to generate data for multiple points. I am not sure how the stabilized stress strain data can be used to specify the isotropic hardening part of the input.
</p>
<p>
</p>
<p>
Kindly let me know if my above perception is correct or is there any better or more accurate way by which I can give apply the available data.
</p>
<p>
</p>
<p>
The basis for the single application of loading and using cycli stress strain data is somewhat like this: Many materials, after initial period of cyclic hardening/softening exhibit a stable behaviour when the hysteresis loops stablize.The cyclic stress strain curve is generated by using these stabilized loops.Thse stabilized loops have been considered to be representaive of the whole fatigue life and hence the applied loading in the form of range and using the cyclic stress strain data correctly simulates the cylic behaviour w/o having to do a cycle by cycle counting.
</p>
<p>
</p>
<p>
Regards
</p>
<p>
</p>
<p>
</p>
<p>
</p>
<p>
</p>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/109">Ask iMechanica</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/4625">ISOTROPIC</a></div><div class="field-item even"><a href="/taxonomy/term/4626">KINEMATIC</a></div></div></div>Mon, 14 Dec 2009 20:40:34 +0000ranababu7246 at https://imechanica.orghttps://imechanica.org/node/7246#commentshttps://imechanica.org/crss/node/7246Plasticity Model for Autofretage of a Cylinder in ANSYS
https://imechanica.org/node/3385
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2520">Cyclic Plasticity</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear All,
</p>
<p>
I am analyzing a steel pressure vessel with autofretage effect in ANSYS. This effect brings the vessel steel fully plastic in the first load step.After the remval of the load in the second step,a permant strain and residual stress remains in the vessel.The residual stress develops compressive stress in the vessel.
</p>
<p>
As the material has Bauschinger effect,thus the yield in compression is less than in tensiion. A bilinear kinematic hardening material model is used. This gives accurate results for the loading step but gives higher residual stress in unloading step because of not taking the Bauscinger Effect.
</p>
<p>
So Is there any material model which can be used for this problem.your help is required.
</p>
<p>
Thanks
</p>
<p>
Shewa
</p>
</div></div></div>Tue, 24 Jun 2008 05:36:11 +0000Himayat Ullah3385 at https://imechanica.orghttps://imechanica.org/node/3385#commentshttps://imechanica.org/crss/node/3385Error | iMechanica