Fea Definition and 124 Threads

Hi, My name is Gordon Mutten. I have been a stress engineer for 40 years working on aircraft, spacecraft , and several other products involving metals and composites etc. I would like to offer my help with simple stress analysis questions. I am soon to start a website for this subject so I...

I'm new to Abaqus and FEA in general, but my professor asked the class to do a simple analysis on a beam using Abaqus, just to introduce us into FEA methods. I've managed to do almost everything he asked for, but I'm confused about some notations when I get the results. I understand that s11...

I'm exploring a possible research project involving numerical simulations of knots. For example, I would like to be able to determine from simulations what is the lowest coefficient of friction for which a square knot holds under load. (Pencil-and-paper calculations by Maddocks and Keller with...

Hi guys, Working on a 50-ton hydraulic press design using a standard H-frame design, like this: I'm working on the design of the vertical members. Similar to the photo above, the verticals have 1.25" diameter holes drilled for pins that support the horizontal bed. The problem: while...

Could the orbit filling order of electrons be more classical and less quantum? I attached a jpeg and need someone to do a electrostatics analysis of the CAD model version of it. Does anyone have an electrostatics software package and have time to do a finite element analysis on a 3-D part to...

Bonjouro! Firstly, as this is my first post here, I would like to say thank you to everyone who is a part of the site and Hello! I've used this forum a number of times, but this is the first time I've posted here as this user! If the flexural stiffness of a beam is 25 MNm^2, and the beam is...

Hello. Consider the model shown below. The problem is to be solved by FEA. The plane element is constrained from moving at the red line. A concentrated load P is applied at the red point and pointing downward. We solve the problem using the following meshes. Same elements are being used and...

I've forgotten a lot of field theory so I've been rereading it in a couple of electric field theory textbooks. What seems like a simple problem falls between the cracks. I hope some readers can help - it will be appreciated. My application seems simple (solution will require numerical FEA but...

I have been given a structure to verify but I personally don't see a way of calculating the reactions & capacity of the parts without delving into a FEA analysis. I welcome any suggestions & help that you can give or insight, i am only trying to confirm the capacity & efficient sections & sizing...

Homework Statement The potential energy of an element in terms of local displacements q1 and q2 is given by the expression: Π = 3(q1^2) - 6q1q2 + 9(q2^2) + 9q1 Write down the expressions for element stiffness matrix k and element force f. I am at a complete loss as to what...

Hi! I am new to ANSYS and I am trying to understand a simulation done by some one else. I have a disk with a spiral in it, and it looks like there is a remote force being applied at the centre of the disk, but spread over the entire face. I don't understand how this force is being spread...

Hi, I am trying to simulate a moving load in ansys 15. Could anybody guide me on how I could do it? A typical example: Calculating stress across a steel Rope ( assume solid circular c/s) between point A to B while a pulley load moves over it between the 2 points with a certain velocity. I will...

Homework Statement Hi there. I have to do this excercise for my exam and I am kinda lost with the verification of data, more precisely calculations. Can you guys help me out? I set 100N load right above the hole... the distance between centers of the hole and nut is 190mm. the max distance...

The title of the project is as follows: A study of the effect of imperfections on the buckling capability of a soda can under axial loading. My group and I are aiming to carry out the following: Linear buckling analysis of soda can to gain first 5 eigenvalues Riks buckling analysis with...

I would like to figure out Mcr(elastic critical moment) and Mpl (Maximum plastic moment) in a beam due to buckling in abaqus. How to model material non linearity. How to model geometric imperfection (slightly crooked beams) Is there any way to import I section (rolled) profiles instead of...

Hey all, So in relation to another question I've posted, I need to apply a distributed pressure in Abaqus on a compressor nozzle. Up to now I was just applying a uniform pressure throughout but I'm wondering how I would apply a pressure distribution? Also would it be simpler to just apply the...

I am doing FEA analysis using Abaqus and I need to get the average/min/max Von Mises stress for a section rather than the Von Mises stress for each individual element. I have tried using python scripts such as http://www.eng-tips.com/viewthread.cfm?qid=184288 however I have had no success as of...

Homework Statement Hi, I need some help analysing this frame. First of all i bellive its hard, if not impossible, to get as detailed results by hand calculations as my softwear CSI Sap2000. Becourse of shear and axial deformation. Is it possible to obtain the stiffness matrix of this frame at...

Hi, I want to understand how stress concentration factor or notch factor is considered in FEA method. Lets assume a case of stepped shaft which has got the left end of the shaft fixed with rigid wall and the other end being pulled by an axial load. In the case of conventional calculation...

Recently I created a structural vibrations simulation and would like to hear some feedback or suggestions.

Hi Guys I am trying to figure out what stresses in different planes mean physically for composite laminates. Say S stands for stress then SXX SYY SZZ would be longitudinal/axial stresses in respective Axes. (If we take the laminates to be in XY plane, failure stress SZZ would be equal to...

Hi all, I am attempting to model an artery under internal pressure in ANSYS APDL.. This is my current attempt.. 1. select solid 8 node 183 element type (and specify thickness) 2. select 5 parameter Mooney-Rivlin (for which I have constants) 3. create quarter area model dimensions 4. map mesh...

I am curious as to how finite element analysis software(like Hypermesh) go about superposition of loadcases(applied on the same model). I constrain my vehicle body for 1.loadcase (say bending) with the standard SPC's and constrain my 2.loadcase(say torsion) with Inertia relief constraints...

Dear Members, The existing design for the pressure vessel is an end cap bolted to the body which is not designed to any pressure vessel code. Currently I'm trying to qualify this pressure vessel to PD5500 code. Due to the derated allowables in the code i couldn't go with the bolted...

I'm working on a group project where we test a bicycle frame on ABAQUS. The test is as follow Where F is a static load. It was suggested for us to consider it as 4G*120kg to simulate a laboratory test. We're having a hard time knowing what is the maximum deflection (or stifness) we should...

I'm working on a student design project building a multirotor UAV to host a sensor array. The airframe supports arm beams with motors producing thrust at the end, a battery, a flight controller, payload, ESC's and needs to be custom made so that it is of a size that can support large blades and...

Hi Why are displacements calculated on integration points but not directly over the nodes. The whole purpose of discretizing a structure in FEA is to have fewer degrees of freedom, then why add integration points when there are well defined nodes. Also, can somebody please explain having...

Hi everyone, I have a 100 mm long, solid cylinder (shaft) with a diameter of 20 mm. The base circular surface at one end is fixed and the other end gets a torque of 100Nm. The SolidWorks simulator (URES) results show that the diameter of this shaft increases by about 0.1 mm due to the...

Hi Everyone I have been working on FEA for past 2 years. However my work has always been academic ( either assignments or validating certain experiments). I have never been exposed to any industry work in FEA. I am curious on how FEA is used in the industry ( specially in engineering...

We currently are running PTC Creo 2.0 for our CAD software and are looking into bringing some basic FEA capabilities in house. Should we just bite the bullet and get Creo Simulate extension? Or so I bother to spend the time looking into other packages? I have used Algor in the past, but they...

Hi Guys I'm analysing a heat exchanger based on an existing commercial model in SolidWorks Simulation. The same materials etc have been applied to it in the Static analysis. Deflection on the heat exchanger is very small. The one thing that baffles me though is how, regardless of even...

Hey all, I have a question that has been bothering my quite a bit lately. Please excuse my relative ignorance of the topic too while I babble :smile: I am an BSME senior at Cal Poly with one year to go. Part of our curriculum is FEA done with FEMAP and I have yet to take the course (next year...

Hi:in a linear spring model for materials, the governing matrix equation is K * U = F where K is the material stiffness AE/l , u is the displacement at each nodes and F is the force in the discretized elements.but this is only true for a linear spring, what if I have some non linear spring? I...

Hi all, This is my first post on this forum. I am located in Australia working as a mechanical engineer. Our Ansys License has expired (Technical support no longer available- Product purchased outright), and for some reason it doesn't allow the setting of 'large deflections' to be turned on...

I'm trying to get a constitutive model for a material based on some uniaxial test results obtained from one of my professors. However, I'm not able to obtain a working model with the data. I get a warning message about the model becoming unstable at the following: UNIAXIAL TENSION: 0.210E+00...

I have to run a FEA analysis on a nozzle check valve body DN700... Its been to a professional engineer and he has completed the study so I am trying to do it myself to get to know the software better... I'm using PTC CREO 2 mechanica as the software... Attached find a picture of the valve...

Hi Guys, I'm new to the forum so please be gentle with me. I am a final year mechanical engineering student in Ireland and i am doing my final year project on reduceing solidification cracks that are occurring in a weldment of a NI-Super alloy during the welding process. I believe that a...

Folks, Can anyone point me to an online source detailing an example of the static condensation process in finite elements. I believe sub structuring is another term used to describe the same process. Regards Bugatti

Last night I tried answering a question I've had for a while- can you really do a proper FEA analysis using free (or at least very cheap) software? I've found myself recommending a couple of times to find a free FEA package for running an analysis on simple geometries, but I don't actually have...

I have gone through Beam Element analysis in several books on FEA. 80% of books have a particular Stiffness matrix, while a very small number of books have a matrix which is subtly different in sign. http://www.flickr.com/photos/66943862@N06/7195680680/in/photostream/lightbox Most books have...

Hello, I was wondering if anyone can help me with my FEA approach. I want to check that my boundary conditions for a simple quarter torus (representing a section of a helical spring) are correct. I'm neglecting the helical angle at this stage. I have fixed one end in all axes, and applied...

I am trying to use FEA with space frame element. I know that for rotating an angle a around the z-axis, the translational displacements of the local and global coordinates are related through the rotation matrix: \begin{bmatrix}cos(a) & sin(a) & 0 \\ -sin(a) & cos(a) & 0 \\ 0 & 0 &...

Hi all. I am a mechanical engineering student and I know a bit of Finite element method. But I don't clearly appreciate the need for studying the course. Why is it important or rather why is it really needed? Also is there a need for mechanical engineers to know compulsorily know a modeling...

Hi everyone, I was wondering if anyone had or knew where to get a good FEA program for my ti89. My homework has begun to take forever what with defining mass matrices and all this nonsense. Any help at all would be much appreciated!:smile:

FEA meshing - why not 2d mesh -> 3d mesh ? Well, I have just realized why the people do not use FEA (finite elements analysis) as often as they should do: FEA preprocessing phase is a disaster! Simply speaking - there is no simple, efficient meshing software available on the market. Existing...

I want to learn/practice using Solidworks' FEA tools. My version only has the SimulationXpress (2011) package which seems weak. I want to know if it is possible to specify roller/slider/pin conditions when using the structural analysis tools. So far I've only seen fixture condition, so is...

Homework Statement http://www.imageupload.org/thumb/thumb_62195.jpg Homework Equations KQ = PKGQ where K = stiffness matrix, Q = displacement vector, P = buckling load, KG = geometric stiffness matrix det(K-PKG)=0 The Attempt at a Solution Elements 1 (A-B), 2 (B-C) and 3 (vertical) each...

Hi all, I was speaking to a design engineer and he mentioned that he uses Classical Finite Element Analysis in his work designing valves and cylinders. Can someone explain to me what is Classical FEA, and how does it differ from FEA that you use in a computer program (Ansys, abaqsus,...)...

hi can anybody please suggest me the good textbooks or references to study the Finite Element Analysis for undergraduate program level...

Hi everybody, I am designing conical shells in the aim to better understand the launch vehicle adapter and what changing thickness of conical shells will do to buckling load and natural frequency. I have an issue with certain equations I have characteristic equations with a critical axial...