Need someone with engineering background to assist with statics calculation

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Discussion Overview

The discussion centers around the calculations needed to design a lighter and smaller aluminum tray for a tablet that can be supported by a tripod. Participants explore the structural requirements and potential design modifications to achieve this goal, including considerations of material thickness and shape.

Discussion Character

  • Technical explanation
  • Exploratory
  • Debate/contested

Main Points Raised

  • One participant seeks assistance with calculations related to the thickness and design of an aluminum tray to support a tablet, expressing uncertainty about the necessary specifications.
  • Another participant clarifies that the goal is to determine the appropriate thickness of aluminum to support a specific weight without bending.
  • A participant suggests that a current tray thickness of 1/8" supports a nearly 5-pound laptop and questions whether a 1/16" thickness could also be viable.
  • There is a suggestion to perform a finite element elastoplasticity simulation to test different tray shapes, requiring specific material properties as input.
  • A participant raises a question about the force applied to a tablet's touch screen, suggesting that additional weight from resting arms or hands could affect the design requirements.
  • Another participant proposes empirical testing and design modifications, such as adding curvature or rolled edges, and recommends sourcing aluminum sheets for experimentation.

Areas of Agreement / Disagreement

Participants express various viewpoints on the design and calculation methods, with no consensus reached on the optimal approach or specifications for the tray. The discussion remains unresolved regarding the exact requirements and methods for achieving the desired design.

Contextual Notes

Participants highlight the need for specific material properties and empirical testing, indicating that assumptions about weight distribution and structural integrity are not fully established. The discussion also reflects a lack of consensus on the complexity of the calculations involved.

dmehling
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I am looking for someone with mechanical engineering background who can assist me in making some calculations. I have an aluminum tray that is connected to a tripod and that supports a laptop. I want to get a lighter and smaller aluminum tray that can accommodate a tablet, but I don't know exactly how small and thin I could get it. I have spent countless hours attempting to find the answer and I asked a version of my question in both the physics and engineering sections of this forum but no luck. I tried to use a free fea cad program but it was a bit too complicated for me. I'm sure that an engineering student could easily figure this out and I would be willing to hire one for a reasonable rate. Better yet would be someone willing to volunteer a little bit of their time. I don't know how complicated this is, but I'm guessing that it shouldn't take more than 30 minutes to make some approximate calculations.
 
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You mean you want to calculate how thick a sheet of aluminum should be to be able to support a certain weight without bending?
 
Yes, that's basically it. If you do a Google image search for aluminum laptop tripod you will see many examples of what I'm trying to do. Right now I have an aluminum tray for my old laptop that sits on a tripod mount. I want the same thing for my tablet, but I want to reduce the weight of the tray as much as possible. The current aluminum tray is about 1/8" in thickness and easily supports my nearly 5 pound laptop, and I imagine it could probably support double that weight. Based on that, I would like to see if a 1/16" tray could work. Furthermore, I would like to know if I could make other changes in regard to the shape of the tray and any other weight reducing techniques.
 
If you want to test different shapes of the tray, you need to do a finite element elastoplasticity simulation on a computer, and input the shear modulus and yield stress of aluminum as parameters.
 
I really need someone who can do that for me, since I definitely don't have any experience with engineering. I played around with a free program called Lisa for the last hour, and I really have no idea what I'm doing.
 
How much force do people apply to the touch screen of a tablet? Perhaps more than the tablet weighs sometimes? They may even rest their arms/hands on the tray?
 
Some things are best determined empirically.
Stiffness without thickness .let's think here ...
Cardboard is corrugated for a reason. Cooking trays have a lip for a reason. Eggshells are curved for a reason.
Can you put some curvature in your design ? or roll an edge ?
I'd go to local hardware store and buy some aluminum sheet for experimentation. Or a metal salvage yard - mine gets a lot of interesting aircraft structural parts...

old jim
 

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