Search results

  1. 5

    Simulating Bonded Contact from ANSYS Mechanical in ANSYS APDL

    Hi, So i solved the above problem. I had forgotten to change the contact settings from "Standard" to "Bonded (always)" in the contact wizard. However, that didnt solve my problem as i was still getting large errors. So i thought i would do a test to see if it was my contact settings. I had...
  2. 5

    Applying Load on an area - ANSYS APDL

    Ahh right, no didnt see that. I got around the problem by applying a negative pressure (as I knew the area the force was being applied over) on the surface. Thanks for the comment though!
  3. 5

    Applying Load on an area - ANSYS APDL

    Hi, Have been using ANSYS Mechanical to conduct some analyses, but am now moving to ANSYS APDL to investigate the effectiveness of Solid-Shell elements. However, I've run into a problem. I can't figure out how to apply a load to an area! I have been playing around with the SURF154...
  4. 5

    Simulating Bonded Contact from ANSYS Mechanical in ANSYS APDL

    Any suggestions? Been looking for some good contact tutorials... but couldnt find any :/ anyone got a link for one?
  5. 5

    ANSYS Mechanical APDL - How to scope results to specific elements of an assembly

    Hi, I have been using both ANSYS APDL and ANSYS Workbench (Mechanical) to run analysis on a structure. After loading the structure, in Mechanical i was able to scope my results for deformation and EQUIV stress to just the adhesive layer as this is what im interested in. However, I can't...
  6. 5

    Simulating Bonded Contact from ANSYS Mechanical in ANSYS APDL

    Hi, I created the model in SolidEdge and saved it as an iges file. Then using Workbench, i set up a Mechanical APDL module and assigned the iges model to it. Then i can right click and say "edit in Mechanical APDL" and it will start up ANSYS classic for me to do my meshing, add loads etc...
  7. 5

    Simulating Bonded Contact from ANSYS Mechanical in ANSYS APDL

    Simulating "Bonded Contact" from ANSYS Mechanical in ANSYS APDL Hi, Im looking into the accuracy of using different element types to model a particular structure. As a simple approximation think of it as a beam split into 3 horizontal sections. Shown in the diagram as top, middle & bottom...
  8. 5

    Area Calculations to find Jc energy Parmeter (simple maths)

    Hi, I tried it again by doing what you suggested and splitting the diagram further into 4 triangles and 1 rectangle. I got a positive area and solved the question :D Thanks for your help!
  9. 5

    Area Calculations to find Jc energy Parmeter (simple maths)

    Homework Statement I have been given the following load-displacement plots for the same specimin with two different crack lengths. The lines are identical up to a load od 750N i need to calculate the area of the blue shaded region to obtain a value of Jc using a separate equation...
  10. 5

    Calculating Nominal strain at which Necking Occurs

    Homework Statement Given two wires of guage length 100mm and 200mm They are loaded to fracture in tension The 100mm sample extends by 15mm The 200mm sample extends by 25mm. I need to use this information to calculate the nominal strain at which necking commences in the wires Homework...
  11. 5

    Effect of Temp on yield stress and fracture toughness

    ahh right. I think thats the question sorted then :) Again thank you very much, you've helped me out a great deal!! Appreciate it :D
  12. 5

    Effect of Temp on yield stress and fracture toughness

    Ahh i see. Yes i understand that. I can explain the yield graph very well now, thanks for your help. Really Appreciate it. Finally for the fracture toughness graph. Do i apply the same information about dislocations being less likely to move at lower temp? Or is it because at low temp the...
  13. 5

    Effect of Temp on yield stress and fracture toughness

    Ok Thanks, So the material has a low yield stress at higher temperature, because the disocations are easier to move? When you say thermally activated processes, what do you mean by that? A brittle fracture fails by rapid crack propagation, as is normally perpendicular to the applied stress...
  14. 5

    Effect of Temp on yield stress and fracture toughness

    Hi, Thanks for the reply. What is the temperature-dependant mechanism? Ive been looking through a few books and searching google for hours but cant find any difinitive answers. Perhaps my searches arent specific enough. i found this text though online ===================== The most...
  15. 5

    Effect of Temp on yield stress and fracture toughness

    Homework Statement I am given the trends for yield stress and fracture toughness as functions of temperature for steel. I need to explain the trends Homework Equations none The Attempt at a Solution I am guessing the yield stress is the stress that the material can withstand...
  16. 5

    Fortran Gaussian Elimination in Fortran

    Hi, Thanks for the reply. Yes i do need to find the solution vector X(IN). I think the problem is actually the last print statement that i have. The one i have used is for a set 3x3 matrix. Do you know how to code it so that it will print "N" solutions? i tried this: but get the...
  17. 5

    Fortran Gaussian Elimination in Fortran

    Hi, I am trying to recreate the naive gauss elimination method in fotran 95 but am having a few problems with it. The idea is to read in a nxn matrix of equations, so you can type in any number when u start the program and then the program will ask you to enter the relavant amount of...
  18. 5

    MATLAB Matlab Error: Undefine Variable

    Hi, Sorry for the late reply, i have been caught up doing other coursework. I have provided a screen shot of the code for "'HC1/Transfer Fcn" I will look into changing the global variable. Thanks
  19. 5

    MATLAB Matlab Error: Undefine Variable

    Hi, I am trying to model a simple 1DOF suspension system [mass(ms) 300kg, stiffness(k) 15000N/m, damping coefficient(c) 2500Ns/m. Its subjected to different inputs and then needs to simulate the dynamic response of the system to a road surface that has the characteristics of a flat road, a...
  20. 5

    Guassian Elimination (Row reduction) of 3 simultaneous eqn.

    Homework Statement I have been given the 3 following simultaneous equations and the question is: "(a) Solve the equations using Gaussian elimination, showing all your working." fairly simple topic i know, but i cant get the answer :/ The Attempt at a Solution Had a few attempts...
  21. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    No problem... Turns out i was making a big error with the momentum equations... have to take into account the P*A forces acting on each end of the control volume. so i get U1 = 2.55 m/s U2 = 5.1 m/s U3 = 5.1 m/s P2 = P3 = 190.2 kPa Fx = -132.6 kN Fy = 12.4 kN which makes much...
  22. 5

    Fluid mechanics

    Just expand the brackets and re-arrange... i typed it in, got 11mm but i might have put it in wrong give it a go... 8405.208-133416(z-0.063)=9810*z 8405.208 -133416*z +(133416*0.063) = 9810*z 8405.208 +(133416*0.063) = 9810*z + 133416*z 8405.208 +(133416*0.063) = (9810 + 133416)*z solve for Z
  23. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Cool, thanks for you help... appreciate it. One last thing, the Fx and Fy we worked out is for the force on the control volume right? So is the force that must be absorbed by the support system the opposite? i.e Fx = 1495 Fy = -1495 Might be worth a mark... not sure...
  24. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    OK here are my final answers... i get: U1 = 2.55 m/s U2 = 5.1 m/s U3 = 5.1 m/s P2 = P3 = 190.2 kPa Fx = -1495N Fy = 1495N
  25. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Ahhh right! Yeah got it... they gave us the volume flow rate in the question...so http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Pressure/FlowGifs/FluidFlow05.gif [Broken] So i get U1 = 2.55 m/s Is that what you got? As i remember, the "v" in that equation stands for volume and not...
  26. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Thanks for the reply. hmm.. i can't spot my mistake.. For the velocity at the inlet (U1) I used the equation mass flowrate = Velocity x Density x Area We're given the mass flowrate 2 m^3/s. Density of water is 1000 kg/m^3 and the area of the inlet pipe is 0.25*Pi so, Velocity = (m-dot)/...
  27. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Ok, thanks for the explanation :) About to work through what you said, one thing though... The problem statement said the mass flow rate was 2 m^3/s, so is it correct to take the velocity as 2m/s? I tried to calculate it as ashown here...
  28. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Hi, lol true, fluid mechanics isnt really my favourite module :p In answer to your question: As the area of the pipe decreases, for the same mass flow rate... the velocity would increase along with the pressure. right? But seeing as the flow is being split in two, the mass flowing through each...
  29. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Right, this is what ive got with what you both said. Is this what you meant i should do? http://img149.imageshack.us/img149/8679/dsc00440cf3.th.jpg [Broken]http://g.imageshack.us/thpix.php [Broken] http://img149.imageshack.us/img149/3536/dsc00441mq8.th.jpg...
  30. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Nothing in the problem statement about inviscid flow.... Ok, thanks for your input... will give it a go, will post up what i get in a little bit :) Thanks 2 both of you btw, should i be taking density to be 1000 kg/m^3??
Top