All Discussions Tagged 'bending' - Grasshopper2024-03-28T17:18:47Zhttps://www.grasshopper3d.com/group/kangaroo/forum/topic/listForTag?tag=bending&feed=yes&xn_auth=noBending membrane with different warp and weft strengthtag:www.grasshopper3d.com,2019-01-28:2985220:Topic:19597822019-01-28T09:37:35.108ZAgata Khttps://www.grasshopper3d.com/profile/AgataK
<p>Hello!</p>
<p>I'm trying to simulate tensile membranes with elastic boundary and different warp and weft strength. The result with the same tension in both directions should look like the the one on the picture below. At the moment the geometry still stays 2D. Could anyone give an advise how to proceed?……</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/906934656?profile=original" rel="noopener" target="_blank"><img class="align-full" src="https://storage.ning.com/topology/rest/1.0/file/get/906934656?profile=RESIZE_710x"></img></a></p>
<p>Hello!</p>
<p>I'm trying to simulate tensile membranes with elastic boundary and different warp and weft strength. The result with the same tension in both directions should look like the the one on the picture below. At the moment the geometry still stays 2D. Could anyone give an advise how to proceed?…</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/906934656?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/906934656?profile=RESIZE_710x" class="align-full"/></a></p> Plywood Strips Bending Simulationtag:www.grasshopper3d.com,2018-10-29:2985220:Topic:19414092018-10-29T10:48:40.154ZAgata Korzeniewskahttps://www.grasshopper3d.com/profile/AgataKorzeniewska
<p>Hi,</p>
<p></p>
<p>I<span> have set up the ply strip bending analysis in Kangaroo to match roughly what I can observe in the physical material but I was wondering whether anyone has done it before and could help find the most optimal starting point in terms of the hierarchy of strengths of goals and general ply behaviour. I am aware that thickness of the material would be one of the parameters as well but was just looking for a good settings to start with before adding the thickness…</span></p>
<p>Hi,</p>
<p></p>
<p>I<span> have set up the ply strip bending analysis in Kangaroo to match roughly what I can observe in the physical material but I was wondering whether anyone has done it before and could help find the most optimal starting point in terms of the hierarchy of strengths of goals and general ply behaviour. I am aware that thickness of the material would be one of the parameters as well but was just looking for a good settings to start with before adding the thickness variable.</span></p>
<p></p>
<p><span>I attach the script showing my primary assumptions.</span></p>
<p></p>
<p><span>Thanks a lot,</span></p>
<p><span>Agata</span></p> Bending rods and auxeticstag:www.grasshopper3d.com,2017-06-06:2985220:Topic:17648742017-06-06T22:27:49.018ZClaudio Campanilehttps://www.grasshopper3d.com/profile/ClaudioCampanile
<p>Hi Daniel and everyone</p>
<p></p>
<p>I am trying to simulate auxetic structures in K2 that are based on elastic materials (<a href="https://it.pinterest.com/pin/530861874809875565/" target="_blank">this is a very good example</a>). To replicate this, I based the script on an elastic, bendable rod with circular section (no goals allow for controlling torsion for what I know). The rods are set with two options, with straight rest position or the (initial) bent one. The calibration integrated…</p>
<p>Hi Daniel and everyone</p>
<p></p>
<p>I am trying to simulate auxetic structures in K2 that are based on elastic materials (<a href="https://it.pinterest.com/pin/530861874809875565/" target="_blank">this is a very good example</a>). To replicate this, I based the script on an elastic, bendable rod with circular section (no goals allow for controlling torsion for what I know). The rods are set with two options, with straight rest position or the (initial) bent one. The calibration integrated with the model is more about giving a scale between the forces rather than the will to accurately simulate them (at the moment). Anyway, I am trying to do it on a macro scale, instead of a micro, with elements which are rather thin.</p>
<p></p>
<p>The system at the moment is not stable. In fact, besides the rods' characteristics is quite fundamental to keep them planar when they intersect. I am lacking something but also probably missing some parameters. In the script, there are two goals to define this: impose 90° between vertical and horizontal, as well as between these and a normal to their intersection. For my understanding, angle goal works tri-dimensionally without a preferred plane and this (hopefully) should address it.</p>
<p></p>
<p>Just wondering if anyone can give me a hint on this. After this step, it would be great to understand if the system can get out of its plane (through a pull force out of its plane, simulated in the script through point loads in the joints). I am still not entirely sure about the possibility of doing this. By looking at <a href="http://lalvanistudio.com/architecture/xurf-purf/" target="_blank">how other auxetic patterns</a> have been used to generate freeform surfaces, I am giving it a try.</p>
<p></p>
<p>Thank you</p>
<p>Claudio</p>
<p></p>
<p>PS: I noticed also <a href="https://www.shapeways.com/forum/t/bistable-auxetic.7895/" target="_blank">this post</a> and <a href="https://spacesymmetrystructure.wordpress.com/2012/10/15/variation-from-uniformity/" target="_blank">this</a>, really interesting. I see the problematic over the stability and the necessity to separate the states with an energetic hill in the first, as well as some potential in using auxetics in the latter.</p> Kangaroo surface inflection paperliketag:www.grasshopper3d.com,2012-10-23:2985220:Topic:7112022012-10-23T06:30:28.572ZAgnieszkahttps://www.grasshopper3d.com/profile/Agnieszka
<p>Hi Everyone</p>
<p></p>
<p>I'm trying to simulate a surface inflection like in the image below</p>
<p></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654774630?profile=original" target="_self"><img class="align-center" height="405" src="http://storage.ning.com/topology/rest/1.0/file/get/2654774630?profile=original" width="538"></img></a></p>
<p>I tried a simple definition that I found in the forum and adjusted it with kangaroo collide surf component to simulate the applied pressure</p>
<p>but:</p>
<p>1. the mesh comes out very edgy and behaves more like fabric than parer</p>
<p>while I need it as…</p>
<p>Hi Everyone</p>
<p></p>
<p>I'm trying to simulate a surface inflection like in the image below</p>
<p></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654774630?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/2654774630?profile=original" width="538" class="align-center" height="405"/></a></p>
<p>I tried a simple definition that I found in the forum and adjusted it with kangaroo collide surf component to simulate the applied pressure</p>
<p>but:</p>
<p>1. the mesh comes out very edgy and behaves more like fabric than parer</p>
<p>while I need it as stiff as the paper model</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654774720?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/2654774720?profile=original" width="471" class="align-center" height="307"/></a></p>
<p>2.another problem is that when I move around the collision brep the surface suddenly tears apart</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654774817?profile=original" target="_self"><img src="http://storage.ning.com/topology/rest/1.0/file/get/2654774817?profile=original" width="467" class="align-center" height="343"/></a></p>
<p>any ideas to any of these problems?</p>
<p>also please refer to the attached definition- maybe I'm missing any important settings?</p>
<p></p>
<p>thanks in advance for help! </p>
<p></p>
<p></p> curved / kinked folding of papertag:www.grasshopper3d.com,2012-04-06:2985220:Topic:5715142012-04-06T22:18:42.253ZMartin Siegristhttps://www.grasshopper3d.com/profile/MartinSiegrist
<p>I'm trying to simulate kinked bends in paper or thin plywood. How can I create a triangle mesh with edges of equal length? I guess I need something like this pseudo physical material equilateralization thing here: </p>
<p></p>
<p><a href="http://www.grasshopper3d.com/photo/equilateralization-1">http://www.grasshopper3d.com/photo/equilateralization-1</a></p>
<p></p>
<p>thanks</p>
<p>I'm trying to simulate kinked bends in paper or thin plywood. How can I create a triangle mesh with edges of equal length? I guess I need something like this pseudo physical material equilateralization thing here: </p>
<p></p>
<p><a href="http://www.grasshopper3d.com/photo/equilateralization-1">http://www.grasshopper3d.com/photo/equilateralization-1</a></p>
<p></p>
<p>thanks</p> Bending resistance + twisting resistance?tag:www.grasshopper3d.com,2011-03-06:2985220:Topic:1768912011-03-06T22:23:36.038ZMårten Nettelbladthttps://www.grasshopper3d.com/profile/MNettelbladt
<p>Dear Group (and Daniel in particular I guess),</p>
<p> </p>
<p>I'm trying to use Kangaroo for simulating 3d-bending of a developable ribbon surface.</p>
<p>Kangaroo <a href="http://thegeometryofbending.blogspot.com/2011/02/kangaroo-physics-drop-shape.html" target="_blank">has proved to be amazingly correct</a> for 2d-bending (and 3d-bending of rods), but so far I haven't been able to get it right in 3d for a developable ribbon surface.</p>
<p>I've made a sketch (image + ghx-file) for a way…</p>
<p>Dear Group (and Daniel in particular I guess),</p>
<p> </p>
<p>I'm trying to use Kangaroo for simulating 3d-bending of a developable ribbon surface.</p>
<p>Kangaroo <a target="_blank" href="http://thegeometryofbending.blogspot.com/2011/02/kangaroo-physics-drop-shape.html">has proved to be amazingly correct</a> for 2d-bending (and 3d-bending of rods), but so far I haven't been able to get it right in 3d for a developable ribbon surface.</p>
<p>I've made a sketch (image + ghx-file) for a way to simulate bending AND twisting in Kangaroo. Rather than making a network of springs and bending-resistance-joints, this method creates a series of planes and rotates each step in two ways. The first rotation is <em>bending</em>. The other one is the <em>direction</em> of the bending (=twisting).</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654703002?profile=original" target="_self"><img width="700" src="http://storage.ning.com/topology/rest/1.0/file/get/2654703002?profile=RESIZE_1024x1024" width="700" class="align-full"/></a></p>
<p>I'm thinking it would be possible to set something like this up with Kangaroo. Both bending and twisting would be series of "bending resistance" values fed into the Kangaroo. </p>
<p>The definition looks a bit messy, but it's really quite simple. The <a href="http://www.grasshopper3d.com/profiles/blogs/tapeworm-a-script-for-creating" target="_blank">tapeworm</a> is a scripted version of this.</p>
<p>From physical testing, my <em>impression</em> is that the twisting resistance is much more powerful in a material than the bending resistance. A twisted material will most of all try to become a 2d-bend, and then it tries to become flat. With this in mind it could be interesting to set the amount of bend and twist resistance individually somehow...</p>
<p> </p>
<p>Thanks a lot for any help!</p>
<p> </p>
<p>Best</p>
<p>/Mårten</p>
<p><a href="http://thegeometryofbending.blogspot.com/">http://thegeometryofbending.blogspot.com/</a></p>
<p> </p> Arduino, FireFly + Kangaroo, why do I get this error? SOLVEDtag:www.grasshopper3d.com,2011-02-22:2985220:Topic:1686882011-02-22T22:35:52.125ZMårten Nettelbladthttps://www.grasshopper3d.com/profile/MNettelbladt
<p>Hi!</p>
<p>I'm moving a Kangaroo anchor point with a slider (x value) and it's working fine.</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654702401?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2654702401?profile=RESIZE_1024x1024" width="500"></img></a> When I replace the slider with values from FireFly (Arduino Uno) there is an error. Any ideas why? <a href="http://www.grasshopper3d.com/video/bending-simulation-in-kangaroo" target="_blank">Video here</a>.…</p>
<p></p>
<p>Hi!</p>
<p>I'm moving a Kangaroo anchor point with a slider (x value) and it's working fine.</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654702401?profile=original" target="_self"><img width="500" src="http://storage.ning.com/topology/rest/1.0/file/get/2654702401?profile=RESIZE_1024x1024" width="500" class="align-full"/></a>When I replace the slider with values from FireFly (Arduino Uno) there is an error. Any ideas why? <a href="http://www.grasshopper3d.com/video/bending-simulation-in-kangaroo" target="_blank">Video here</a>.</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654702587?profile=original" target="_self"></a><a href="http://storage.ning.com/topology/rest/1.0/file/get/2654702808?profile=original" target="_self"><img width="500" src="http://storage.ning.com/topology/rest/1.0/file/get/2654702808?profile=RESIZE_1024x1024" width="500" class="align-full"/></a></p>