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  1. Burner2k

    MSC Patran Composite Question & a Vibration Analysis Question

    Hello, I have a basic question regarding modeling composite laminates using MSC Patran. I need to edit input deck files that I receive from my colleagues and I use MSC Patran to do the same. I use the PCOMP editor and I have asked this question to our MSC seller as well but I am not convinced by...
  2. Burner2k

    Help with FEA Verification

    Hello, I am looking to some help (references) about verification of FEA methodology. Specifically for transient dynamic analysis. I am thinking of a simple tensile load or pointed transverse load on cantilever as shown below. I will first try with axial since it will be a single DOF system &...
  3. Burner2k

    Strain Gauging Instrumentation Help

    Hello, We are planning to strain gauge instrumenting our birds during ground static tests and flights. I am looking for some references & pointers on how to accomplish the same. I need help in the following: 1. Determine suitable locations on Wings/Fuselage from Finite Element Models. If I am...
  4. Burner2k

    Help with Inertia Relief & RBE Issue

    Here is the setup of my problem. I have a projectile which is being launched from a tube. I need to do a static analysis on the projectile. Objective is to ascertain integrity of the structure during launch. I have quasi-static loads (in terms of Gs) which the projectile will experience at the...
  5. Burner2k

    MSC Nastran - Help in Modeling this Setup

    Hello, I need some help in trouble shooting/modeling this setup. I am using MSC Nastran as solver. The setup is shown below with the cross-section shows the arrangement of the beam. The outer skin is made from Carbon Fiber laminate and the core is made of foam. I have modeled the the...
  6. Burner2k

    Young's Modulus & Shear Modulus Calculation

    I have a beam with the following cross-section (due to drawing in paint, the internal circle looks slightly crooked) As shown, the outer circle is made of Carbon Fibre layers while the inner region is filled up with foam and cured together. I know the mechanical properties of individual...
  7. Burner2k

    Defect Characterization for NDT

    One of the components in our product is of Carbon Fibre-Sandwich construction. We have to get NDT done on our initial parts. Before carrying out NDT, we need to characterise the defects by training the machine. Are there any open-source guidelines available on introducing different types of...
  8. Burner2k

    NX Nastran Buckling Analysis with Manual Inertia Relief

    Hello, I am trying to learn on how to do Buckling Analysis using Inertia relief in MSC/NX Nastran. Trying to learn on a simple plate and progress in to more complex problems. Currently, I using Femap and I am able to run Static Solution successfully but in 105, I am getting Fatal errors. I am...
  9. Burner2k

    Basic GD&T Concept Question

    Hi, I am new to GD&T and learning from mainly Youtube videos (a couple of references I found from this site including Mr. R Dean Odell's excellent playlist). I am yet to invest in a good GD&T book (I keep on hearing Bruce A Wilson as an excellent one but $100 is not something I can afford...
  10. Burner2k

    I Beam or C-Channel Question

    This is quite a basic conceptual knowledge an experienced structural engineer should have by now but recently I realized that my understanding may not be a solid as I want it to be. If I need to select a cross-sectional shape for a beam like Spar, which one would be better? An I or a...
  11. Burner2k

    Modeling a Wire in Non-Linear FEM

    Trying out a simple model in Nastran. Basically intent is to demonstrate geometric non-linear effects on a wire subjected to transverse load. The wire is hinged in both sides. I want to capture the membrane stiffening effects due to geometric non-linearity. Initially, I was modeling using CROD...
  12. Burner2k

    Pressure Distribution Equation Help

    I think this is more of a FEA question but related to Aerospace...hope its OK posting here. As of now, the problem is hypothetical but I believe this format of FEA input is common in many places. Lets say I have a cone shell as shown in the figure below. A custom cylindrical coord system with...
  13. Burner2k

    Question regarding using Laws in V5

    My basic need is to generate a curve based on an equation (4th order polynomial). I understand one can use FOG laws & parallel curve command to generate curves to follow an equation. To test & get a better feel, I tried a simple equation y=x^2. My reference line (for parallel curve) length is...
  14. Burner2k

    Fastener Flexibility Application for this Scenario

    Folks, Let's say I want to calculate Shear Flexibility of a fastener/rivet in a joint using equation such as Huth for FE input. The joint shown below is hypothetical but I want to learn on how to tackle a joint made of dissimilar materials & different thicknesses. In the above joint, the...
  15. Burner2k

    Analysis Physics Question

    Recently, I did a linear static (SOL 101) & linear buckling (SOL 105) analyses of an air intake using Nastran solver. Due to proprietary nature, I won't be able to post any screen shots. However, I will try to give some generic info to help define the setup & questions. The air intake is...
  16. Burner2k

    Caita V5 Surfaces Clean Up

    What I am showing here is a very simple case for illustration/clarity purposes. Anyways, I have a sketch which is made off two different curves (in this case two arcs) internally. When I perform any surface generation operation from this sketch, a black line appears (this case in the...
  17. Burner2k

    Question about specific design choices of joints.

    I received a "design" of a rib-spar joint from our design group (for whom the design inputs were received from client). The design contained staggered riveted joints. I was curious to learn about their choice of staggered instead of a usual in-line patterned riveted joint. Our design folks had...
  18. Burner2k

    Help with Flow Area Knockdown Factor (?) Research

    Hi Folks, I am looking for some pointers on where to start my research. I am not a CFD/Aerodynamics Engineer. Currenltly providing Design/CAD support under the guidance of Aerodynamics Engineers. I have extracted several sections along the X-axis of a system. The sections are essentially...
  19. Burner2k

    A rudimentary BC Question

    Wanted to get some additional information on how to model the following in FEM. If I want to simulate a plate with biaxial loading with or without shear acting along the edges, what are the different possible boundary conditions which can be specified to capture the deformation pattern...
  20. Burner2k

    Creating Louvers on a Curved Surface

    Hello, I need to create a set of louvers on a curved surface. Here are the set of problems I am running into: 1. General Sheet Metal Design cannot create walls on curved surfaces. 2. So used Aerospace Sheet Metal Design (ASL) to create "web" on a curved surface. 3. But ASL doesn't seem to have...

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