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  • Users: vorwald
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  1. vorwald

    Simulating Landing Accelerations in NASTRAN for Fatigue

    I have carrier landing acceleation data of a pod, and have created a NASTRAN model of the pod. I would like to a) represent the landing accel data in NASTRAN for fatigue analysis b) evaluate the landing accel data vs airspeed to identify trends for extending to other landing speeds. So...
  2. vorwald

    S99 Properties

    Can someone provide me with S99 (C 0.36/0.44 Si 0.10/0.35 Mn 0.45/0.70 Cr 0.50/0.80 Mo 0.45/0.65 Ni 2.30/2.80) fatigue properties, preferable S-N.
  3. vorwald

    newbie: Exterior / cross sect drgs frm assbly

    OK, I took a week of CATIA V training a while back (maybe six years). And I know I have a workbook somewhere, but .... I need to generate dimensioned drawings of assemblies built up from v4.2 models. I need both exterior and cross section views. Can someone give me enough detailed steps so I...
  4. vorwald

    Evaluation Copy of CATIA v5

    How can I obtain an evaluation copy of CATIA v5 for viewing / creating dimensioned drawings of v4.2 parts / assemblies
  5. vorwald

    CATIA v4.2 to IGES Conversion

    Is there a proceedure for converting CATIA v4.2 to IGES or cgr formats? Are there any issues to be careful with?
  6. vorwald

    NASTRAN Composite Modeling Test Data

    In order to develop confidence in a modeling approach to composites, it is useful to have experimental data available. Particularly if the experimental setup can be simulated in NASTRAN, and the measured results predicted. One experiment that I've used to demonstrate NASTRAN's ability to...
  7. vorwald

    Object / person recognition

    Has anyone used the video processing capabilities to recognize objects or people? How well does it work?
  8. vorwald

    Damage from modal amplificaiton of stress

    I have a metal structure that consists of webs and caps (beams). I also have a detailed NASTRAN model. The structure is subjected to periodic loading (17.5 Hz). The load consists of large amplitude, short duration pulses. I have data from 28 strain gauges throughout the operating conditions...
  9. vorwald

    3d model of aircraft , jeeps, howitzer

    I have a simulation of cargo under a helicopter support via slings. I would like to improve the visualization of the model via 3d visualization. Does anyone have a vertices / nodes / faces model for any helicopters, humvee, or howitzer.
  10. vorwald

    Sling load stability data

    Does anyone have any data on sling load instabilities. Flight test data would be load / vehicle / airspeed information and possibly a description of the load motion, and if the test was instrumented there could be time histories of controls and hook loads. Wind tunnel data would be load...
  11. vorwald

    Extracting loads from measured strains

    I have a NASTRAN model, and will be recieving time histories of a number of strain gages for a number of tests. The objective is to calculate the fatigue life thoughout the part. Has anyone correlated their NASTRAN FEM with time history without having the applied load? Can you send me...
  12. vorwald

    Shear Moment Diagram

    Does anyone have suggestions / experience with generating shear moment diagrams for a plate / rod elements. I've applied the external loads and constraints, and now I would like to plot shear / moment of an internal part.
  13. vorwald

    Converting Beam Forces to Stresses

    Question: What is the formula for calculating combined stress at a point in beam element NASTRAN? Below is my hand calculation of the combined stress, and it is quite a bit different from the calculation from NASTRAN. I am modeling an angled beam with force in the axial direction. My input...
  14. vorwald

    Mech Properties of 3M S-2 Glass/1003 Tape

    Does anyone have the properties of this tape. In particular, I need the compressive strength, 0 and 90 degree.
  15. vorwald

    V4 Finite Element

    For V4, I'm looking for suggestions on how to do finite element analysis (structural). I have had limited sucess translating the CATIA model to NASTRAN through FEMAP. The problem is the large number of definitions that are in the CATIA model. I currently don't have the V4 FEM Analysis...
  16. vorwald

    NATRAN MAT8 vs PSHELL/MAT2

    I have a mat 8 card derived from a composite laminate properties (inverse of the A matrix of the ABD), and I have PSHELL/MAT2 generated from the PCOMP card. The answers are quite a bit different. Can some explain how to compare a MAT8 card to a set of PSHELL/MAT2 cards.
  17. vorwald

    NASTRAN PCOMP/PSHELL

    I would like to convert PSHELL/MAT2 cards generated by a PCOMP card (CSA NASTRAN) into a form like stress = stiffness * strain in order to compare the stiffness matrix with an ABD matrix from laminate theory. Does anyone know how to generate a stress/strain relationship from information on a...
  18. vorwald

    LWINS data Longitude/Latitude

    Does anyone know how to convert LWINS data (Long/Lat) to degrees/minutes/seconds.
  19. vorwald

    Control System Binding Testing & Requirements

    I am looking at a proposed mechincal control system linkage that has two inputs, a mixer bar, and about 15 linkages. Does anyone have any guidelines on the testing / analying linkages for binding. I am aware that Adams and Working Model are used for evaluating linkage motion. Do they also...
  20. vorwald

    Is NACA TR 824 digitized and available?

    On the web site http://www.icemcfd.com/cfd/naca.html#02, I see that NACA TR 824 was digitized. Does anyone know if this data is available somewhere? NACA is the paper that gave rise to Abbott and Doehoff's book "Theory of Wing Sections"

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