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  1. VN1981

    MSC Dytran & Stress Question

    Hello, I am learning MSC Dytran through our MSC reseller. The problems we are going through are explicit non-linear cases (like a dropping ball tearing through a thin plate). The stress output being referred is "Equivalent Stress". Up on further reading, it seems that Dytran is referring the...
  2. VN1981

    Help with Recommendation for Basic Drafting Tutorials?

    Hello folks, I am looking for good introductory drafting/drawing tutorial or courses per ASME standards? Most of the courses I've seen are courses of GD&T per AMSE standards. I am looking for more basic drafting tutorials. Also any good resources which would illustrate differences between ISO &...
  3. VN1981

    Separating Fairing Loads Estimation

    Hi, We are gonna use a container which will need to separate after launching. The concept we've arrived at is similar to Rocket Payload Fairing separation i.e. the two halves held together will separate. We are not using pyro-bolts due to safety reasons but something similar mechanism. Now we...
  4. VN1981

    Is this Corrent?

    We received a drawing from a vendor...the drawing below is just for illustration of what I wanted to ask I noticed the hole on the right is not dimensioned...he explained that since he has drawn a centreline in the middle (I forgot to dimension it), it automatically means that all dimensions...
  5. VN1981

    Cutaway Diagram of Small Drones

    Hello, I am looking for cutaway diagram for small tube launched drones/munitions like Switchblade 300 (could be a drone of any class)...basically want to get an idea of internal structures arrangement for drones which have folded wing mechanism. Any open source papers or thesis recommendations...
  6. VN1981

    CPE - Few Questions

    I got a couple of questions in Catia V5 CPE... Firstly, I am trying to generate a solid laminate using Grid methodology for a UAV wing skin. Typical wing skin with "pads" (beefed up region) at locations where ribs & spars attach & "pockets" between the stiffeners. I using a combination of Catia...
  7. VN1981

    Question about modeling practices in GSD

    I wanted to get some tips on good modeling practices in Catia V5 (or 3DExperience as well)... Let me ask my question through an issue I am facing. Firstly, I am using mainly Generative Shape Design and some part design workbenches to accomplish my model. Trying to model some custom gills like...
  8. VN1981

    Need Help Modelling Tips

    Trying to model a pressure bulkhead like this one Basically, need some tips on modelling web stiffeners with minimal effort & time. I want to make the stiffener spacing parametric so if I need to make any changes in spacing, it would be easier. I am thinking of drawing all the stiffener lines...
  9. VN1981

    Boundary Surface (Solidworks) equivalent in Catia

    I was exploring surfacing options in Solidworks when I came across an improved loft tool called Boundary Surface. A kinda longish article on what it does: Link A Youtube video explaining the tool: Link Wondering if Catia has an equivalent tool. The major appeal in Boundary Surfaces is the...
  10. VN1981

    Editing STEP Files

    Primarily a Catia user here...kinda have to work on Solidworks as well...probably will work on both CAD packages as needed. So we receive a lot of assemblies in STEP format and after importing in to SW, if I need to edit individual parts within assembly, how do I go about it? In Catia, I just...
  11. VN1981

    Aircraft Control Surfaces to Fixed Surface Gap Question

    We want to minimize the gap between the control surface & fixed surface of the wing. Currently, our Control surface leading edge has round shape as shown above and the wing shroud (or closeout shroud connecting the top & bottom skins) is also similarly shaped. Our control surface acts as an...
  12. VN1981

    Sketching Question

    Is there any feature in Catia to enforce curvature continuity between arcs/curves inside sketcher environment? Tangency is readily available...been searching the web but could not find any helpful answers. I am using R28 version...
  13. VN1981

    Control Surfaces Hinge Moment Calculation

    Firstly, this isn't my area but got dragged into this project. In these hard and lean times, you have to do what is needed to survive. Primary objective is to find a way to optimize control surfaces hinge moments and ultimately bring down size of Control Surfaces. Currently, for prelim...
  14. VN1981

    Patterning a Feature in Part Design

    Hello, I need to model a stiffened cylinder...basically a cylindrical shell with lots of horizontal & circumferential stiffeners. The stiffeners will be integral i.e. machined...I need to radius any exposed edges of the stiffeners. Initially I thought, I will radius one of the stiffeners and...
  15. VN1981

    Rapid Populating as Assembly Help - Catia V5

    Hello Folks, I have received a small aircraft assembly which has all the major structural items (Skins, Ribs, Spars, Brackets etc.) expect for fasteners. However, all parts do contain holes where fasteners are supposed to go. I also know which fastener to use...So I need to populate the assembly...
  16. VN1981

    Creating Multiple Lines Rapidly

    Let me give some background before I put up my question. Typically fasteners are represented using 1D elements in FEM and our practices are no different. We got a new functionality in our FE pre-processing tool, where automatic fastener elements can be created for hundreds of them at a time and...
  17. VN1981

    Bulk Fill of Holes?

    Have received an assembly of multiple panels which are joined by rivets. The solid model contains rivet holes numbering in hundreds. I have to extract outer surface and fill up the holes to get a water tight geometry. Very hard to do fill individually for each hole. I did explore in GSD and was...
  18. VN1981

    Catia V5 - ICEM Aero Expert Lofting Issue

    Hi, Saw a few videos of Catia V5 ICEM Aero Expert lofting feature and seemed lot more capable compared to Multi-Section Surfs from GSD. May be I am doing it wrong but after lofting a surface using ICEM Aero Expert, I am noticing small gaps (deviation from profiles/guides curves) between...
  19. VN1981

    V5 - Multi-Section Surfaces Area Law Help

    Folks, I need to create a surface loft with area law (change ratio) and I just discovered that V5 offers to accommodate such a law during lofting. I went through the help and tried following similar procedure to my sections and Catia is giving me error. The help manual is not comprehensive as in...
  20. VN1981

    Structural Config Studies Question

    Hi, I am looking for some pointers on how to get started estimating preliminary structural aspects while doing configuration studies. Without giving out too much about the project, we will be doing some config studies on a Flying Wing. The aero folks will be playing around with Aspect Ratio...

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