iMechanica - Comments for "Failure by simultaneous grain growth, strain localization, and interface debonding in metal films on polymer substrates"
https://imechanica.org/node/3320
Comments for "Failure by simultaneous grain growth, strain localization, and interface debonding in metal films on polymer substrates"enDear Nanshu,
I see that
https://imechanica.org/comment/10182#comment-10182
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<p><em>In reply to <a href="https://imechanica.org/node/3320">Failure by simultaneous grain growth, strain localization, and interface debonding in metal films on polymer substrates</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear Nanshu,
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I see that you have a very good experience with ABAQUS. I hope you can help me with the following very simple problem.
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I have a problem simulating earthquake effect on a very simple structure. The structure is a 2 story steel plan frame structure. with lumped mass at its corners.
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I am applying the Northbridge earthquake on it but I am getting very strange results.
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I am applying the Material density beside the lumped mass at corners. I do not know if using lumped masses is correct like this or not.
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Both, eignvalues and frequencies and also responses are not correct.
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I attached the input file and also the acceleration time history for the earthquake.
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The input file extension was changed to txt so the server can accept it.
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Here is the link
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<a href="http://imechanica.org/node/5090">http://imechanica.org/node/5090</a>
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Looking forward to hearing from you.
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Regards for all,
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Maher Elabd
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</ul>Thu, 19 Mar 2009 13:35:29 +0000maherelabdcomment 10182 at https://imechanica.orgSorry for the late reply.
https://imechanica.org/comment/7884#comment-7884
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<p><em>In reply to <a href="https://imechanica.org/node/3320">Failure by simultaneous grain growth, strain localization, and interface debonding in metal films on polymer substrates</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>Sorry for the late reply. EBSD is a good method to monitor the texture of the film. By the EBSD, the grain size of the Cu could be clearly investigated. Especially, the <em>in-situ</em> SEM loading with the EBSD could check the grain growth when the Cu film is under tension. Such a <em>in-situ</em> SEM with EBSD method has been successfully applied to investigate the equal channel angular extruded Mg-3Al-Zn magnesium alloy. However, as you say, the indexing rate is very low for nano grains.</span> </p>
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Ying Li Department of Engineering Mechanics Tsinghua University Beijing, 100084, P. R. CHINA
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</ul>Tue, 24 Jun 2008 08:56:10 +0000Ying Licomment 7884 at https://imechanica.orgThe size effect on failure modes of metal thin films
https://imechanica.org/comment/7744#comment-7744
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<p><em>In reply to <a href="https://imechanica.org/comment/7740#comment-7740">Effect of film thickness</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi, Teng,
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Thanks for pointing this out. Actually it is what I am doing now.
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Basically the film failure mode exhibits a ductile-brittle transition as film thickness reduces. But we found that neither the thickness nor the grain size alone will be sufficient to understand the phenomenon. I am trying to take both factors into consideration to give better explanations now.
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I'll send you some preliminary results through email.
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Nanshu
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</ul>Thu, 12 Jun 2008 17:26:26 +0000Nanshu Lucomment 7744 at https://imechanica.orgDifficulty with grain size distribution
https://imechanica.org/comment/7743#comment-7743
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<p><em>In reply to <a href="https://imechanica.org/comment/7737#comment-7737">Interesting work!</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Ying, thanks for your interest and comment.
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We haven't found any efficient way to determine the statistical distribution of nano grains so that we are trying to show straightforward micrographs at this point.
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TEM is not suitable because the film microstructure is very unstable and easy to change during sample preparation.
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EBSD works well for annealed films with micron-sized grains but the indexing rate is very low for nano grains.
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XRD does not show much broadening because our grain size is not small enough.
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I will try AFM to see if it can give reasonable results.
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Manually sketching grain boundaries will always work but I will keep it as the last choice.
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Do you have any experience or suggestions on this to share with us? Many thanks.
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Nanshu
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</ul>Thu, 12 Jun 2008 17:10:00 +0000Nanshu Lucomment 7743 at https://imechanica.orgEffect of film thickness
https://imechanica.org/comment/7740#comment-7740
<a id="comment-7740"></a>
<p><em>In reply to <a href="https://imechanica.org/node/3320">Failure by simultaneous grain growth, strain localization, and interface debonding in metal films on polymer substrates</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Nanshu,
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Neat experiments! The paper reveals another critical mechanism governing the failure of metal films on polymer substrates.
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The films reported in paper are about 1 micron thick. I'm curious about the effect of film thickness on the deformation-induced grain growth. For example, does similar phenomenon occur in a thinner film (say, a few hundred nm thick) on a polymer substrate.
</p>
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</ul>Thu, 12 Jun 2008 15:08:49 +0000Teng Licomment 7740 at https://imechanica.orgInteresting work!
https://imechanica.org/comment/7737#comment-7737
<a id="comment-7737"></a>
<p><em>In reply to <a href="https://imechanica.org/node/3320">Failure by simultaneous grain growth, strain localization, and interface debonding in metal films on polymer substrates</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>Have you done the detailed work on the grain size distribution according to your SEM or FBI imagines? I think the statistical data may be more helpful to understanding the deformation-induced grain growth.</span> </p>
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Ying Li Department of Engineering Mechanics Tsinghua University Beijing, 100084, P. R. CHINA
</p>
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</ul>Thu, 12 Jun 2008 12:26:24 +0000Ying Licomment 7737 at https://imechanica.orgError | iMechanica