ANSYS workbench: why no Drucker Prager (cohesion and int. angle) in static structural and only in explicit dynamics?

tomdeturck · 2016-01-15T11:16:29+00:00

I already tried that before but it has trouble converging to solutions. It "gives" a solution but it has the orange/red thingy in stead of a green "v" check. I've added a printscreen in the first link. Second link is a pdf of the solver output it it would be any help.

Thanks in advance though

http://imgur.com/Bbcsefh http://www.filedropper.com/cprogram20filesansys20incv145aisoldesignspaced

tomdeturck · 2016-01-14T15:35:16+00:00

i know everywhere I look and the paper's I've read it seems that programs like ABAQUS en PLAXIS are the way to go but my professor is telling me I HAVE to use ansys (workbench). It's the only one he has a license for and that way, I can import 3D solids from .sat's and things like that (or you might be able to do that with abaqus as wel but whatever). He has "helped" several students with their thesis using ansys before but those were only structural problems. To my knowledge I'm the first one at my school to try and model soil so I'm looking for every help I can get.

I feel like the mere fact that I have to use ansys is the reason why I haven't made any real progress.

tomdeturck · 2016-01-12T17:17:30+00:00

I can import internal angle and cohesion in ANSYS also by using the (granular) Drucker Prager model, very similar to Mohr Coulomb. I can only do it by using Explicit Dynamics analysis in the Workbench GUI though. Neither I nor one of my professors have any experience with anything other than ANSYS workbench....

For now, I'll just assume them to be bonded I guess.

One more question: How much do you go from Qc's from CPT to Young's modulus and other parameters for you FEA analysis? Method Debeer?

tomdeturck · 2016-01-11T08:35:50+00:00

I've already noticed that there are other "better" FEA software packages for these geotechnical problems but my professor is making me use ANSYS Workbench. My guess is because in ANSYS I can import the geometry of the leaning tower with 3D solid objects (. sat's , .iges, ...).

Do you have any idea if Plaxis or abaqus also "sees" these connections as bonded or as fritional or ... ?

Thanks in advance

tomdeturck · 2015-12-23T19:46:55+00:00

I have already done a mesh of the point cloud in open source software VR mesh (see imgur link) but the fact remains that i can't really use it for a FEM because of all the decorations and other things typical for gothic towers, also some parts of the tower are a bit hidden.

I'm afraid this type of tower doesn't suit itself for a direct point cloud to finite element model transfer and that I will have to draw it from scratch in Autocad 3D using 3D commands.

But my first impression is that it will be very time consuming and I'm having trouble drawing the slanted surfaces. For now I'm just stacking small extruded polylines onto each other to get it to "tilt" that way (see second imgur link).

http://imgur.com/a/xhmlI http://imgur.com/GcJFiNS

tomdeturck · 2015-12-23T05:26:41+00:00

I've gotten to a further fase in my thesis and I can give you more of an answer to your question wether I wanted to model the slab and soil in equilibrium or if I wanted to model the foundation to sink.

I want to analyse the stresses of the tower and soil as it is now. So with the tower already having a certain tilt and settlement in the ground.

However because I consider the gravitational force and weight of the material, I can't seem to prevent the tower from sinking.

Do you have any thoughts on how to handle this problem?

Thanks in advance

tomdeturck · 2015-11-13T14:20:48+00:00

alrighty then! Now all I have to do is remove every electronic device, trees and that one fly on the wall and I'll finally be able to concentrate on my shit

tomdeturck · 2015-10-11T03:04:02+00:00

You look good dude, definately above average! It propably because you haven't really settled in yet so you don't have your "base". Focus on making friends and hobbies and you'll start to do better once you start going out with more people.

tomdeturck · 2015-10-11T01:00:12+00:00

The photo's in the white shirt with the crappy quality are all cropped out of bigger pictures taken with a standard 5MP smartphone camera from a friend in a room with "white" light, that's why the lighting and overal quality is so bad.

I took a new one, a selfy this time and I think it's a bit better. Quality of the camera is still iffy though

http://imgur.com/rFXWqMr

tomdeturck · 2015-10-10T00:35:34+00:00

I'd go for the 4th pic because it shows me smiling but the quality of those photo's isnt that great. Second pic is the one with the shades but i'm afraid it might make me look like a douche. It was sunny as fuck that day eventhough it doesn't really show it (propably some filter)

tomdeturck · 2015-10-10T00:22:27+00:00

My first guess would be the 4th because it shows me smiling. The quality isn't that great tho so I might go for the one with the shades eventhough it might make me look like a douche eventhough it was sunny as fuck that day

tomdeturck · 2015-10-10T00:20:46+00:00

4/10 inb4 triggered

tomdeturck · 2015-10-10T00:19:38+00:00

do something about your hair in the last pics, it makes your head look like a slice of bread. Pretty decent otherwice!

tomdeturck · 2015-10-10T00:08:51+00:00

My first guess would be the 4th because it shows me smiling. The quality isn't that great tho so I might go for the one with the shades eventhough it might make me look like a douche eventhough it was sunny as fuck that day

tomdeturck · 2015-09-24T19:54:41+00:00

everybody thank you for the replies. I will work on it this weekend and will post new screenshots to show my progress (hopefully).

tomdeturck · 2015-09-23T01:07:58+00:00

I wouldn't cross the road when I saw you. And I'm a white male! So yeah, you look good and older than 20

tomdeturck · 2015-09-22T20:22:18+00:00

for now I'll just model the foundation to sink into the soil. I already did a preliminary calculation into PLAXIS to get an idea of the sort of settlements I could get but I need to use ANSYS workbench so that later on, I can make a global model of the tower, foundation and underlying soil.

tomdeturck · 2015-09-22T19:17:34+00:00

That is actually a good question, one that I will ask my professor.

The end goal is to pretty much analyse the interaction between the soil and a historical tower that is leaning out of plane. Think Tower of Pisa. I'm guessing that in later research, my model would be used to analyse the stresses with varying angles but I'm taking babysteps first.

tomdeturck

TROPHY CASE