Bending stress and Von Mises stress for shell elements?

Discussion created by Xiao Shang on Feb 3, 2020
Latest reply on Feb 13, 2020 by Jay Seaglar

Like • Show 0 Likes0
Comment • 2

Hi Community,

I'm running a simple simulation of a rectangular vacuum chamber subjected to external ambient pressure using shell elements, just to verify my calculation with the ASME VIII code. However, I got really confused when trying to plot the bending stress.

For shell elements, when generating a stress plot, I have the option to select the stress component (Von Mises, principal etc.) but also bending/membrane. My question is, how can a stress be Von Mises stress and bending stress at the same time?

Also, I set up my simulation as indicated in the attached picture but the result does not make sense comparing to my hand calculation. I basically applied gravity and external pressure on the out side of the box while fixing the bottom face.

Could anyone provide insight on what I'm doing wrong?

TIA

Attachments

Capture.JPG58.9 KB

Outcomes

S. Y. Feb 13, 2020 11:50 AM

Please upload your model (in STEP) here, maybe some guy can give you a hand.

Actions

Jay Seaglar

Feb 13, 2020 4:18 PM

Some customers find it easiest to understand membrane stress by starting with a unaxial tensile load case on a plate modeled using shell elements. Compare that to the same study using solid elements, and focus on directional stress components (normal and shear). Add a bending load and additional complexity from there. The following SOLIDWORKS Knowledge Base (KB) solutions may help:

S-019633: "What are shell elements and why should I use them?"

S-019591: "For shell elements, what are membrane and bending stress, and how does it relate to the top and bottom faces?"

S-018603: "What is Stress linearization and what are the Available Stress Linearization results?"

And if your forum post does not yield enough assistance from the community to help you move forward with your analysis, please be sure to contact your SOLIDWORKS Value Added Reseller (VAR) for assistance.

Actions

2 Replies

S. Y. Feb 13, 2020 11:50 AM
Please upload your model (in STEP) here, maybe some guy can give you a hand.
Like • Show 0 Likes0
Actions
Jay Seaglar Feb 13, 2020 4:18 PM
Some customers find it easiest to understand membrane stress by starting with a unaxial tensile load case on a plate modeled using shell elements. Compare that to the same study using solid elements, and focus on directional stress components (normal and shear). Add a bending load and additional complexity from there. The following SOLIDWORKS Knowledge Base (KB) solutions may help:

S-019633: "What are shell elements and why should I use them?"
S-019591: "For shell elements, what are membrane and bending stress, and how does it relate to the top and bottom faces?"
S-018603: "What is Stress linearization and what are the Available Stress Linearization results?"

And if your forum post does not yield enough assistance from the community to help you move forward with your analysis, please be sure to contact your SOLIDWORKS Value Added Reseller (VAR) for assistance.
Like • Show 0 Likes0
Actions

Bending stress and Von Mises stress for shell elements?

Attachments

Outcomes

Related Content

Recommended Content