How to extract correct outer cap frame fastener loads by a Global FEM rapresenting aircraft in the current manner:
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|=frame as cbeam
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___= skin panel 1 stringer bay CQUAD
In general for frame fastener load i use cquad xy shell force extraction for left and...
Pre-tension not simulated in fem is a good question.
The real loads and stress will be higher than those seen as results.in fem you can simulate it only in one way.in fem you can use a preload at both nodes at each side.tension load.but in general is useful to proceed analitically.Use ESDU.pay...
Pressure or force applied beetween part connected by bolts on the flanges connection line is not relevant for bolts. If beam give compression is because you cannot simulate contact of flange but bolts will be surely unloaded in reality.Bolts have not to be sized for this case.In general for this...
FOR Static
Niu - Airframe ..... Stress and Design
FOR F&DT
AFGROW : http://www.siresearch.info/projects/afgrow/index.php
HANDBOOK OF DT DESIGN USAF:
http://www.siresearch.info/projects/dtdh/pdfs.php
with nastran and patran you have 2 choice:
1) try using mpc rbe2 with 1dof and node edited to analisis cid so that 1dof is allined with this axis. than you can simulate contact with an iterative procedure so to remove to your analysis group all mpc constraing your flanges.your aim is to obtain a...
Can MPC RBE2 with 6 d.o.f. be used correctly to simulate bolt in FEM instead of bar and other things.....The mpc shape i'm talking is to create from a 3d model an indipendent node at one face and all dipendent connected in an umbrella shape...the other face of the same solid the other node and...
I'm trying to simulate flanges contact in patran using gap element for 2d element. can someone help me to find another way? even connecting not allined nodes?
To make a good correlation predicting test results by FEM forecasting don't forget mohr theory and how stress are related to strain. i suggest to you before checking your model to see strain theory because gauges give apparent stresses and fem gives real stress.
For analysis of thin plate the best thing is to perform by nastran the sol105 to reach first buckling mode and then sol106 by large displacement and no follower force so to define using non linear geometrical analysis the behaviour of your structure and the maximum load for investigation.The...
Ok. But how simulate rosettes? Can I use rod? I'm tring A=0.001 And material E=1. ni=0.3 dens=0. th-exp=0 also for rosette but i think that it is not correct because this don't take in account the shell z1 or z2 face and so on.
pbeam seems to me more correct i'm tring also I1=I2=0.001....but is...
