topic Re: Thermal Load in Robot Structural Analysis Forum

Thermal Load

Mustafa_AlNajmawiNA4QJ — Tue, 08 Aug 2023 09:31:38 GMT

Hi All,

I'm slightly confused on how to apply thermal gradient / thermal load.

I have a plate and i would like to just see the effects of the thermal gradient on this plate. This plate is basically a diaphragm wall. My soil temperature is +10 degrees and the exposed side the maximum temperature is 40 degrees. How do i approach this??

@Artur.Kosakowski

@mustafahesenow

@Rafacascudo

Re: Thermal Load

Simau — Tue, 08 Aug 2023 11:48:20 GMT

@Mustafa_AlNajmawiNA4QJ

Re: Thermal Load

Mustafa_AlNajmawiNA4QJ — Tue, 08 Aug 2023 10:34:59 GMT

could you please give me an explanation?

Re: Thermal Load

Rafacascudo — Tue, 08 Aug 2023 11:08:26 GMT

well explained here
https://forums.autodesk.com/t5/robot-structural-analysis-forum/temperature-gradient/m-p/6367487#M45245

Re: Thermal Load

Simau — Tue, 08 Aug 2023 11:11:38 GMT

Please take a look at this thread

https://forums.autodesk.com/t5/robot-structural-analysis-forum/thermal-load-application/m-p/10288542

Re: Thermal Load

Mustafa_AlNajmawiNA4QJ — Tue, 08 Aug 2023 11:15:24 GMT

Hi,

appreciate the quick reply, i dont seem to understand how the values you have given me, gives me the gradient of 30,

based on Robot manual, dT1 is the uniform temperature (we can consider it the operating temperature) and gT is the gradient.

Based on that the bottom surface will be [dT1 - gT/2 = 17.5 ] and the top surface is dT1 + gT/2 = 32.5. That does not give me the temp that i require (bottom surface 10 and top surface 40)

Re: Thermal Load

Simau — Tue, 08 Aug 2023 11:51:13 GMT

@Mustafa_AlNajmawiNA4QJ

You are right, my mistake.

Important: message #2 updated

Re: Thermal Load

Rafacascudo — Tue, 08 Aug 2023 16:43:32 GMT

Sorry to answer on a "accepted solution" thread but

"dT1 is the uniform temperature (we can consider it the operating temperature)"

Just to be clear , dT1 is the dfference between the assembling temperature and the maximum or minimum (or any)temperature that place can reach on a given moment . dT1 ,if positive or negative will have a stretching or retracting effect on the structure plane .

Gradient is just the difference between the temperatures above and below strucuture plane , and will give a bending effect on the structure.

If you want to analyse just the bending effect dT1 should be zero.
Below a test model with a slab with one fixed edge while the 3 others are free.

Case 1 uniform 20 degrees , case 2 gradient 20 and case 3 unif 20 + grad 20

Showing global X and global Z displacements for each load case

Re: Thermal Load

Simau — Tue, 08 Aug 2023 18:15:32 GMT

Hi @Rafacascudo

The goal is to fill the "temperature and gradient" tab in order to satisfy the requested requirements: temperature of the lower face = 10° and upper face = 40°.
In this thread we have
- dt1 = 25
- Gradient = 30° (equivalent to +15° in upper face and -15° in the lower one)
So we meet the requirement:
Upper side= 25°+15° = 40°
Face in = 25° -15° = 10°

Re: Thermal Load

Simau — Wed, 09 Aug 2023 17:12:33 GMT

@Mustafa_AlNajmawiNA4QJ @Rafacascudo

In message #2 i assumed that assembling temperaure is 0°.

Otherwise if assembling temperature is T0, dT1 will be dT1= 25°-T0, no change for the

gradient (30°)