AutoCAD Inventor :: Set Pin Constraint In Stress Analyses Doesn't Function Properly
Apr 20, 2012
I've got a problem with simulating a benchframe. The frame is attached to the car's body with 4 flat braces. I now want to attach the braces to the benchframe, but leave them to be able to rotate from each other.
I have fixed them to the body using a pin constraint, which works pretty straight forward but I'm not able to get this working on the side of the benchframe.
I have placed 4 pins, to allign the components and assigned manual contacts with "sliding/no separation" but now the whole construction doesnt move sideways in the X-direction and enormous stresses are developed because the benchframe is not deforming either. I have assigned every contact point and surfaces between the benchframe and the braces as "sliding/no separation".
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Jul 27, 2012
adding constraints to assemblies, in particular which choice of force constraint to add when using a bolted connection.
My scenario - I have a steel tube bolted to a plate which I have performed a stress analysis on. I have opted for the pin constraint where the tube is bolted to the plate and selected the bolt this option to add the constraints. This to me would seem like the best choice as the bolt is held by this constraint.
Autodesk Inventor Professional 2013 SP2 64-Bit Edition
Windows 7 HP Z400, Intel Xeon W3550 3.07GHz
12.0GB RAM, ATI FirePro V4800 (FireGL)
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Oct 11, 2012
I am using Inventor 2009 professional and I have to run a stress analysis on a beam. I put the constraints and the forces I need and when I hit the calculate button, the results so up, but when I click on the results, nothing appears. I need to run this calculation and do not want to resort to hand calculations.
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May 11, 2013
I have an assignment in school in which we are going to calculate the number of needed rivets and their dimensions to join two pieces of aluminum with the dimensions 5x50x200mm together.
I've created the sheet metal and imported two of them into an assembly along with 8 rivets from the content center with the appropiete dimensions. In comes my problem. I planned on running a stress analysis and pasting the pictures of the results in my report. However, I have a feeling that the stress analysis tool isn't working as it should.
No matter what force I'm applying to the sheet metals, and no matter what material I assign to the different parts, including the rivets, the results, the deformation and force applied to the rivets, are roughly the same.
I've applied a force of 12700N to the two short sides of the sheet metals:
The two sheet metals are also fixed on the opposite side of the forces:
[URL]
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Dec 14, 2013
When I paste an item in the assembly, the item is thrown off in space. It places it so far away that it is not even in the view window. I have to stop what I doing, do a find in window and then drag it close to where I need it. Then I can start constraining it.
Why does it not place the item at my coursor location like it used to?
I am using SP1.
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Dec 27, 2013
I've been doing a lot of work with the Stress Analysis recently, and I have wondered if a certain feature exits. When I am interpreting the results of a simulation, I'll use the probe to find out the stress in certain areas. The problem is that I can't be certain that I've picked the point of highest stress in a certain area. I know that I can find the highest overall stress, but it's hit or miss finding the 'highest local stress' as I've come to call it. I need to be able to prove that a certain member's stress is below the allowable stress, and I can't be certain of the member's highest stress unless y'all know of some way.
I am running Autodesk Inventor Professional 2014, 64-bit.
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Jul 30, 2012
I am designing a vertical axis wind turbine just for some practice (just started using Inventor) and everything was going smoothly until I tried to "animate" it spinning. First, I set up a work plane that goes through the center of the structure, and then I clicked angle constraint "explicit reference vector." After watching several youtube videos, I figured that I should click on the work plane, click on another reference point, and then click another point that would be orthogonal to those two (right?). Well after I choose the first point, Inventor will only allow me to choose the center axis as the second option (which I think should be the third option).
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Feb 26, 2014
I am trying to get the hand to write with a pencil. I pose the hand and fingers holding the pencil and constrain (parent constraint with offset) the pencil to the hand's wrist controller and freeze the pencil's translation attributes. When moving the wrist controller creating key frames or translating in the UI, the pencil does not follow the hand/fingers. There seems to be an offset with the pencil that get worse the farther I translate or rotate the wrist controller. I tried doing the same with just the fingers and getting the same result.
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Nov 25, 2012
when importing in Lightroom 4, the auto tone adjustment function does not work properly. Most images come out strongly overexposed and there is no way to stop it
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Dec 21, 2012
I have and array that looks fine in model space but when viewed in a viewport from paperspace, sections of the array look like they are wiped out. Going back to model space everything looks fine. The only way I can get it to fill in is to delete the viewport and create another one. It's then fine for awhile but before long, areas are missing again. I've redone the viewport three times and it's starting to drive me nuts.
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Oct 22, 2013
I'm using ACAD (2011) most of the time in 3D. I like to work that way and it goes really fast!
Now, sometimes I want to flatten my 3D drawing and show my obscured lines and make them dashed afterwards. With the flatten command and explode it works fine... but... some lines just move! For example, a block with size 100,200,100 turns into a square with size 100.9 x 199.3, even if I use the command in 100% top view!
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Nov 13, 2012
I'm trying to be able to have a function run another function with the secondary function being passed as an argument to the first. I'm trying to create a recursive function and the recursive part works great. I just need to be able to have the recursive function run other functions to actually do stuff.
Here is something I found that should do what I need, mainly run a function from a function name in a variable.
Sub test() Dim ftnName As String Dim argument As String Dim result As String ftnName = "myFunction" argument = "cat" result = Application.Run(ftnName, argument) MsgBox resultEnd SubFunction myFunction(inString As String) As String myFunction = inString & " has " & Len(inString) & " letters."End Function
However I get the error "object required" on the "result = Application.Run(ftnName, argument)" line. So I'm guessing the Inventor VBA doesn't like this method of doing this. I'm just hoping there is a way to do this or this function will be useless or reduced to hardcoding functions which still defeats the purpose.
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Feb 18, 2011
I am a computer technician in a society that uses AutoCAD Architecture 2010.I'm having some problems with the software.
First problem:
On the computer of one of our users, the profile created in Autocad suddenly disappears :-(. We do not know why ... The user is obliged each time to recreate his profile, reconfigure all toolbars .Have you ever encountered this problem?
Second problem:
On another computer, from time to time the delete function of Autocad is no longer functional. We need each time between Pickfirst = 1 and that works.How to ensure that this function does not disappear?
Third problem:
On another computer, the user activates the 3D profile, he selects his palette, and when he clicks on the "more"window, autocad error appears "Error Report Autodesk,..." . Is it possible to display all palettes?
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Mar 22, 2012
I need to print this drawing and I cannot get either print to PDF or print to printer working properly.
I was asked to create a local area map of the site and i used a google map image as the map. I have a paper space layout with labels and the company title block, with a raster image reference in the model space viewport, when I go to print this drawing using plot PDF the image comes out so grainy it's useless. When I plot to printer the paper space layout comes out great but only a slice of the raster image is printed.
No indication of problems can be seen in autocad's preview mode, and this doesn't happen outside of Autocad- I can open the image and have it print to PDF clearly, and I can open the image and print to printer without problems.
Here's a link that explains what the printer is doing: [URL] .......
The image is supposed to fill the whole viewport, but most of the viewport is blank.
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May 8, 2012
previously i was using civil 3d 2010, now while i am using 2012. i want to create a grid of points with easting and northing. i have manually created a point but when i use array command it does not work properly. as u can see in this image.
i created point with proper values of easing and northing but after array easing northing values becomes just -19.
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Aug 17, 2013
i have problem with pan function, it doesn't work on scroll button, i have windows 7 (64 bit), microsoft wireless mobile mouse 4000 and autocad 2011, i have downloaded new software for mouse and changed wheel button to middle click and i have changed mbuttonpan to 1 in autocad, still not working.
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Oct 20, 2011
I`m trying to determine will Inventor satisfy the needs that I`m having regarding simulation options. So I started with some elementary stuff.
If it is possible in stress analysis to manually select which degrees of freedom body has.
"Fixed constraint" block all 6 DOF and I would like to block only transitional DOF so that I keep rotational degrees of freedom?
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Dec 11, 2011
My measure function doesn't displays anymore the result on screen but in the command lines. What must I do to make it back to normal again?
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Oct 8, 2013
I am trying to simulate the following:
I have an 8" OD/5.523" ID steel tube. A 5.5" OD/4.957"ID tube is placed inside. The 8" and 5.5" tubes are placed over a 4.9375"OD shaft. So basically you have a hollow shaft attached to a drive shaft, with a filler tube placed between them to fill the gap. Two 1-1/2" UNC bolts are placed in matching1.531" diameter holes in every component (thru bolted) with a nut. Tightening the nut will tend to flatten the pipes, taking up the clearance between then and creating a contact pressure on the drive shaft. I have having trouble getting all of the contacts correct since the components are not in contact at the beginning of the simulation due to the radial clearances.
Two axial bolt loads of 129,000 lbs will be placed on the tubes. I have used a sliding/no separation contact between the bolt and nut. Then I put a fixed constraint on the bottom face of the nut (not in contact with the tube) and put a 129,000 force on the top of each bolt head to simulate the axial load created by the bolt preload. What type of contact should I use between the tubes that have radial clearance?
I have attached the tubes and drive shaft. The 1-1/2" bolts and nuts (both heavy hex) were found in the library.
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May 9, 2013
How to set up a symmetric stress analysis?
I read about using symmetric analysis on a symmetric assembly, but no description of how it is done.
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Jan 6, 2014
I am trying to properly stress test a steel aircraft fuselage. I can easily model the estimated weight of the pilot, copilot, etc as loads on the airframe. However, when it comes to simulating a high-G situation, (a load factor of around 7.5 times the force of gravity), I am not sure what to do. On one hand, I can simply multiply the loads on the airframe by the load factor and see if the frame can take it. In most cases, it performs very poorly, (safety factor less than 1). However, if I model all the loads under normal conditions, (normal pilot weight, etc.), then add a gravity load equal to 7.5 G, the airframe performs well. Yet I am not sure if the loads on the airframe, (such as pilot weight), are being adjusted along with the increased gravitational load.
My question is, what is the best way to accurately simulate real world loading for high-G situations?
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Dec 31, 2012
I am trying to determine how to properley constrain the assembly below, so that the compression of the rubber gasket will be properly indicated.
Currently I am seeing the deflection of the shelf in the downward direction, but I do not see any indication of stress in the gasket behind.Currently the gasket is "bonded" to the steel tube the screws are bonded to the shelf bracket and the steel tube.
I put in "work axis" at the center line of the shelf bracket and the CL of the gasket, but I can't find a way to constrain to a work axis.The file is too large to upload here...
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Mar 6, 2012
inventor 2012
64 bit machine
12gig ram
and it says I don't have enough memory! How can this be? Its not that complicated of an assembly. I have done bigger. I excluded all the part I'm not using and they are all basic plate and tube parts. There are less than 20 parts in the assembly.
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Nov 13, 2013
I have used a few times 'Stress analysis' before. Today I discovered it is disabled. I applied a software update (SP1, build 222), after which I could run a Stress analysis again. However, Inventor crashed soon, and after restarting it, Stress analysis is disabled again. In 'Add-In Manager' the 'Simulation: Stress analysis' is shown as 'Automatic/Loaded'.
UPDATE: I have unchecked the 'Load Automatically' option for this module, quit Inventor, started it again, loaded the module and now it seems to work. I don't know yet for how long...
UPDATE2: well I could start a Stress analysis, but everything is disabled there, I can not create a simulation for example.
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May 8, 2013
I have just installed Inventor 2012 on a clients machine and the stress analysis tab is missing.
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Oct 14, 2012
is their a possibility to applay stress like dynamic i have a shaft that has a pully on it , its conectet on an old way
not with a tight fit so it shrinks on it but it works wit a small cut in the shaft where its bolted with just a tiny metal plate.
at this place will be a stress concentration and i wanne see how the noth effect is when their is a dynamic load on it cause if i put a static load on it i know the shaft can handel it but i real life it has broken couple of times so this is what i want to investigate.
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Sep 19, 2013
I work for a tank building company and we are starting to use Inventor for stress analysis. We have a tank that we are designing that has a tank inside of another tank. The internal tank will be holding product while the outside tank is there to prevent product leakage in the event that the internal tank has a leak. There is piping that is welded to both the inside tank and the outside tank.
So here's my question: We know the radial deflection of the piping on the internal tank due to pressure, but we want to know what the stress is going to be on the external tank shell. Is there a way that I can input the amount of deflection and so that inventor will calculate the stresses involved?
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Feb 22, 2012
I'm a student working on a team project to build a vehicle and we're required to do a stress analysis to make sure if the vehicle (chassis, supports, etc) can withstand the weight of the driver, etc.
The problem is that the analysis that I did doesn't seem to make any sense at all, like there was no stress between the joints, the frame bent when the applied force was only 5 kg...
The metal used is mild, steel.
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May 14, 2013
I'm trying to run a simulation on a part to test it's resistance to explosive forces and pressures. All the tutorials I find on stress analysis seem to be grader toward mechanical parts or tables.
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Aug 15, 2013
I'm trying to create a report on a stress analysis I've made. Reading the report I don't find any result on safetyfactor. When I was browsing the forum I found a thread concerning safety factor and a report file attached. My report is missing some of the information that I found in this attached report (such as "result summary".
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Apr 16, 2012
I'm performing a static stress analysis on a benchframe. The benchframe is imported out of a STP file and I assume that's where the problems begin.
When I start the simulation, everything goes well. When I see the results, almost the whole part is blue, and only a really small part in a corner is shown red, with extremely high stresses.
The corner is actually not what I wanted to test, but it is messing up the other visible results because now I have to place probes all over the part to see the stresses (because the colors are calibrated with the high peak).
I have tried working with local mesh control and convergences, but I can't control the results in the small corner. I also tried rebuilding surfaces and adding fillets.
Is it possible to set a maximum stress, so that the other colors are visible in the important areas. It is not possible to exclude the corner from the simulation because it's part of a substantial part.
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