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  • Users: WK95
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  1. WK95

    Good Practice in Keeping Links?

    I've read elsewhere that it's generally not a good idea to create any external references (part to other part references) to anything that isn't published. So in CATIA's Part Infrastructure Settings, should I keep enabled the "Keep Link with selected object" and "Restrict External selection...
  2. WK95

    UAV Belly Landing Loads?

    I'm a student working on designing a UAV and I'm currently working on figuring out preliminary estimates for most structural loads. I'm looking for reference for the load factors experienced by UAVs designed to belly land. Examples of UAVs that belly land are the Lockheed Martin Stalker, and...
  3. WK95

    Best Practice for Publishing Elements

    In a given CATIA assembly, I have my master geometry in a part. 1) When publishing sketches, lines, and edges for other parts to use, should I publish into the master geometry part level or publish to the assembly level?
  4. WK95

    Deflection of simply supported plate with multiple points of application

    How can I estimate the deflection at the center of a simply support plate (and a sandwich one) with multiple points but same intensity of load application? The points of application are symmetrical and form the shape of a rectangle and the loading at each point is the same. An approximation by...
  5. WK95

    Merging lines in fillet?

    Shown above is the fillet of two surfaces. There's a small surface in between the two curves designated by the red arrows. How can I remove that small surface by merging the two curves?
  6. WK95

    Modeling smoothly blended fuselage and vertical tail

    I want to create an aircraft empennage which is blending in with the vertical tail as illustrated by the following picture. I tried doing something similar but the surface isn't smooth as shown by the attache picture with zebra stripes. What am I doing wrong? Ideally, I want to model an...
  7. WK95

    Composite structure analysis by hand

    There are lots of resources for structural analysis using FEA but I don't want to even dabble with FEA until I can confidently get ballpark answers the old fashioned ways (Microsoft excel, pen and paper, calculator, etc). Any resources for that? Here's what I'm looking for 1) Resources for...
  8. WK95

    Focus on unidirection composites in intro texts?

    Yes, total beginner question. Why do many introductory or overview texts on composite materials focus primarily on unidirectional fabrics while giving minimal coverage to bidirectional? They focus a lot on undirectional composites and base a lot of the derivations and calculations on the...
  9. WK95

    Joggles with composite structures

    How do you folks make a joggle with composite materials in CATIA? What I have so far are surfaces defining an airplane wing's leading edge. I've split the surface into two parts, top and bottom. I've set up the layup on the top half already. On the bottom half, that's where I need to create a...
  10. WK95

    Importing airfoil data, making a curve, and manipulating curve?

    Using the following tutorial and the macros that came with CATIA, I was able to import airfoil data points into CATIA from which I created a curve in a sketch. How can I manipulate the curve and scale it. https://www.youtube.com/watch?v=nP_gErfA5IQ For example, while preserving the shape, I...
  11. WK95

    Plies draping in wrong direction?

    In my model made in CATIA V5-6R2015, I've set the draping direction for the Plies Group to up along the positive z axis of my axis system. However, when I create a ply, then explode it, I notice that its draping in the wrong direction. When I double click on the explode plied it says "Ply...
  12. WK95

    Composites: Can't select Rosette for Plies Group

    I've already created a rosette in the bottom left corner but when I am making a Plies Group, the Rosette selection box is grayed out.
  13. WK95

    Preliminary design of a composite fuselage?

    I've just started studying composites design. To get a better idea of how the stuff I learn fits into the big picture, it'd be great if someone could give me just a brief overview of the process of designing a fuselage with an arbitrary shape (not necessarily a simple circle). 1) Starting from...
  14. WK95

    Drawing a line to a spline

    So I have a spline in a sketch. I then want to draw a line from a point to that spline. Alternatively, I draw a line then make one point of that line coincident with the spline. But when I zoom in to the point where the line should be touching the spline, I notice that in actuality, the line...
  15. WK95

    Resources for learning about aircraft structural design using composites?

    Some of you especially those who do work in aircraft structures may be familiar with Bruhn's Analysis and Design of Flight Vehicle Structures. I've heard great things about the book but was also told that it was written for metal structures. Is anyone familiar with any books written in a...
  16. WK95

    Error w/ multisection surfaces"Invalid Element Type: The element ... does not have expected typ

    I am modeling a aircraft fuselage for conceptual design work. First, I make the side view sketch to act as guide cures. Then I made a top view sketch for just the left side of the fuselage. After I make the relevant lines, I mirror them to the other side. Following this, I make cross curves that...
  17. WK95

    Using CAD to help with Aircraft Conceptual Design

    I am working on a aircraft conceptual design project and am at the stage where I need to work on the layout and configuration design of the aircraft. To help out with this, I'm been using CATIA however probably not as well as it should be used. Note that because I am only in the conceptual...
  18. WK95

    Problem selecting cross sections for Multi-Section Surfaces

    When I try to select the first curve, I instead end up selecting the entire sketch of that cross curve. When I then select the second curve, I select just the curve I need and not the entire sketch. Why is this happening?
  19. WK95

    Selecting a feature's edge or points while sketching?

    I'm a novice in CATIA right now. In CATIA while working a sketch, I can't have my cursor snap to a point or edge on other sketches or features. Is there some button I have press while sketching if I want to do this? Alternatively, I'd want to be able to select edges and points of other sketches...
  20. WK95

    What combination of computer hardware?

    i5-5200U with Nvidia 840M VS. i7-5500U with Intel HD Graphics 5500? For Siemens NX, should I prioritize graphical or processing capabilities?

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