17. Sandwich Panels
Vložit
- čas přidán 12. 09. 2024
- MIT 3.054 Cellular Solids: Structure, Properties and Applications, Spring 2015
View the complete course: ocw.mit.edu/3-0...
Instructor: Lorna Gibson
This session introduces sandwich panels, stress, strain, failure modes and optimum design.
License: Creative Commons BY-NC-SA
More information at ocw.mit.edu/terms
More courses at ocw.mit.edu
1:00 Sandwich panel definition
6:35 General information about sandwich material
14:00 Sandwich beam deflection study starts
20:03 Bending deflection calculation
29:00 Shearing deflection calculation
32:20 Introduction of the formula that gives the foam core shear modulus as a fonction of foam density
33:28 Minimum weight design for a given stiffness study starts
41:40 Results of the minimum weight study (most weight/deflection ideally in the core)
45:06 Comparison of the minimum weight study with the experiment
49:45 Strength of sandwich beams
50:15 Normal stress in the faces
51:27 Normal stress in the core (negligible)
54:40 Shear stress (mostly in the core)
58:32 Failure mode
1:02:58 Face yielding
1:03:45 Face wrinkling (buckling)
1:08:00 Failure mode map
Wonderful and relaxing to listen to her talk about sandwich panels.
Do you have a document for calculating the concentration force for the beams of honeycomb structure, please?
Great explanation, thanks for sharing this.
thanks a lot. But, i think there is something missing. when faces are composite laminates stiffness is represented by the matrix A. Which element of the matrix should i take when calculating flexural rigidity ?
The fact all these MIT courses are online truly baffles me
This should help: czcams.com/video/XUM4lLbG5UY/video.html. 😋
Thank you very much, it was an excellent explanation. ☺️ While watching, I wanted to go and hug the teacher. 🌸
Sandwich panels sounds like something i have to learn about 😋
Or eat
Great video and course, and truly helping, thanks a lot for sharing it !
so great, thank you so much,
she is precious ... !
Can Steel SIPs be applied as external wall on circular buildings?
Im trying to figure out what the Bi constant values are. Is there a reference to them somewhere? If im trying to predict the deflection and dont know what those are, the equations are pretty useless.
I get that B1 is dependent on the boundary conditions and I know how to derive those because that is typical beam mechanics. Im not familiar with the B2 term. In the lecture all the other Bi terms are defined, just not B2.
This lecture beyond WhatsApp University students.They can not understand simple glass panel.
thanks
So all of this is just for beams? Can I apply it to panels too or is there another video for that?
Thank you. But the Format of this lecture is not suitable for CZcams
we offer sandwich panel glue spraying machine
Anyone have any ideas for calculating deflection for asymmetric sandwich panels? I am struggling to implement two different Ef as two different laminates are used for the inner and outer sheets.
You calculate the EI terms for the two face panels separately and apply the parallel axis theorem for each of them and add them up.
generically;
(EI)eq = (Ec bc^3/12)+ (Ef1(bt1^3/12 + bt1y1^2))+ (Ef2(bt2^3/12 + bt2y2^2))
where Ef1 and Ef2 are the different elastic moduli of the face sheets and y1 and y2 are the respective distances from the neutral axis to the respective centroids (the neutral axis would not be at the geometric center of the core if the faces were different)
Thanks for info, the chalk board tapping sound driving me crazy
Dad, What’s a chalkboard???
Wow! I feel stupid now!
Z
Format of this lecture is not good for CZcams