LIU WANG's blog
https://imechanica.org/blog/10018087
enHard-magnetic Elastica
https://imechanica.org/node/24286
<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-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Stroke is #1 cause of long-term disability and #4 cause of death in the US. Most of the patients are not treated in time due to unavailability of professional neurosurgeons on site. We have developed a ferromagnetic soft continuum robot for tele-operated and autonomous navigation and treatment of strokes. The foundation is the hard-magnetic elastica theory which offers a fast and accurate prediction of the large deformation of the ferromagnetic soft continuum robot. Please check our recent paper at JMPS. <a href="https://authors.elsevier.com/a/1bETm57Zjx1FL">https://authors.elsevier.com/a/1bETm57Zjx1FL</a></p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="Image icon" title="image/jpeg" src="/modules/file/icons/image-x-generic.png" /> <a href="https://imechanica.org/files/Figure%201_0.JPG" type="image/jpeg; length=119783" title="Figure 1.JPG">Schematic of the ferromagnetic soft continuum robot with a magnetically responsive tip</a></span></td><td>116.98 KB</td> </tr>
<tr class="even"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/Hard-magnetic%20Elastica.pdf" type="application/pdf; length=3267863">Hard-magnetic Elastica.pdf</a></span></td><td>3.12 MB</td> </tr>
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</div></div></div>Sun, 14 Jun 2020 15:42:18 +0000LIU WANG24286 at https://imechanica.orghttps://imechanica.org/node/24286#commentshttps://imechanica.org/crss/node/24286Effects of surface tension on the suction forces generated by miniature craters
https://imechanica.org/node/21712
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>There are emerging demonstrations that micro- or nano-craters engineered on polymer surfaces can enable enhanced adhesion. In the past, we have developed a framework for quantifying the suction forces produced by isolated macroscopic craters neglecting surface effects. In this paper, we take surface tension into consideration because it plays a significant role in miniature craters on soft polymers. We have derived linear and nonlinear elastic solutions for the elasto-capillary distortion in miniature hemispherical craters whentheyare demoldedfromthe template. Byimplementingauser-elementsubroutine in finite element modeling (FEM) software ABAQUS, wehave also simulated the demolding, compression,and unloading processes of the craters subjected to surface tension under large deformation. With the simulated volume changes of the crater, pressure drop and suction force can be deduced. We find that surface tension induced crater contraction has a negative effect on the generation of suction forces. We discover that reinforcing the crater surface by a thin and stiff shell can help sustain the crater shape after demolding. The effects of shell thickness and stiffness are quantitatively investigated through FEM and optimal parametric combinations are identified.</p>
<p>For further information about cratered surface, please go to Shutao Qiao (<a href="http://imechanica.org/blog/28819">http://imechanica.org/blog/28819</a>).</p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/Effects%20of%20surface%20tension%20on%20the%20suction%20forces%20generated%20by%20miniature%20craters.pdf" type="application/pdf; length=1790826">Effects of surface tension on the suction forces generated by miniature craters.pdf</a></span></td><td>1.71 MB</td> </tr>
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</div></div></div>Tue, 17 Oct 2017 01:48:24 +0000LIU WANG21712 at https://imechanica.orghttps://imechanica.org/node/21712#commentshttps://imechanica.org/crss/node/21712Conformability of a Thin Elastic Membrane Laminated on a Soft Substrate With Slightly Wavy Surface
https://imechanica.org/node/19459
<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/17">thin film</a></div><div class="field-item odd"><a href="/taxonomy/term/10733">conformability</a></div><div class="field-item even"><a href="/taxonomy/term/10967">bio-electronics</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>Conformability of a Thin Elastic Membrane Laminated on a Soft Substrate With Slightly Wavy Surface</p>
<p>Liu Wang, Nanshu Lu*</p>
<p>When laminating a thin elastic membrane on a substrate with surface roughness, three scenarios can happen: fully conformed (FC), i.e., the membrane completely follows the surface morphology of the substrate without any interfacial gap, nonconformed (NC), i.e., the membrane remains flat if gravity is not concerned, and partially conformed (PC). Good conformability can enhance effective membrane-to-substrate adhesion strength and can facilitate signal/heat/mass transfer across the interface, which are of great importance to soft electronics laminated on rough bio-tissues. To reveal governing parameters in this problem and to predict conformability, energy minimization is implemented after successfully finding the substrate elastic energy under partially conformable contact. Four dimensionless governing parameters involving the substrate roughness, membrane thickness, membrane and substrate elastic moduli, and membrane-to-substrate intrinsic work of adhesion have been identified to analytically predict the conformability status and the area of contact. The analytical prediction has found excellent agreement with experimental observations. In summary, an experimentally validated quantitative guideline for the conformability of elastic membrane on soft corrugated substrate has been established in the four-parameter design space.</p>
<p><a href="http://appliedmechanics.asmedigitalcollection.asme.org/article.aspx?articleid=2482749">http://appliedmechanics.asmedigitalcollection.asme.org/article.aspx?arti...</a></p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/jam_083_04_041007.pdf" type="application/pdf; length=1461005" title="jam_083_04_041007.pdf">Conformability of a Thin Elastic Membrane Laminated on a Soft Substrate With Slightly Wavy Surface</a></span></td><td>1.39 MB</td> </tr>
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</div></div></div>Wed, 10 Feb 2016 19:11:13 +0000LIU WANG19459 at https://imechanica.orghttps://imechanica.org/node/19459#commentshttps://imechanica.org/crss/node/19459Error | iMechanica