17. Sandwich Panels

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

[@74hdo]

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

[@flutist218]

Wonderful and relaxing to listen to her talk about sandwich panels.

[@ridwansetiadi8393]

Great explanation, thanks for sharing this.

[@menh7670]

Do you have a document for calculating the concentration force for the beams of honeycomb structure, please?

[@ilaydanuratam6469]

Thank you very much, it was an excellent explanation. ☺️ While watching, I wanted to go and hug the teacher. 🌸

[@valentiniallonardi1956]

Great video and course, and truly helping, thanks a lot for sharing it !

[@riadelhamoud8224]

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 ?

[@lucianchevvy97]

The fact all these MIT courses are online truly baffles me

[@mitocw]

This should help: kzbin.info/www/bejne/joawZZ-Cl6xoi7s. 😋

[@FocusMrbjarke]

Sandwich panels sounds like something i have to learn about 😋

[@josefierro5981]

Or eat

[@MBDina]

she is precious ... !

[@GuenfoudLoubna]

so great, thank you so much,

[@SohanLal-ci3gx]

This lecture beyond WhatsApp University students.They can not understand simple glass panel.

[@clintshook9254]

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.

[@clintshook9254]

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.

[@adithyaarun9981]

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.

[@SunilSundar]

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)

[@rikomine2388]

Can Steel SIPs be applied as external wall on circular buildings?

[@ressy673]

So all of this is just for beams? Can I apply it to panels too or is there another video for that?

[@gluedispensingmachine]

we offer sandwich panel glue spraying machine

[@mattwright7042]

Thanks for info, the chalk board tapping sound driving me crazy

[@freefinancialadvice]

Dad, What’s a chalkboard???

[@suadabbassali9504]

thanks

[@MohammadrezaIzadineshat]

Thank you. But the Format of this lecture is not suitable for KZbin

[@4230020]

Wow! I feel stupid now!

[@shahidbaig7827]

Z

[@andreysorokovikov5542]

Format of this lecture is not good for KZbin