Weight/Strength of aluminum versus plastics

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around comparing the weight and strength of aluminum and various plastics, particularly in the context of their performance under applied forces. Participants explore the conditions under which each material deforms or breaks, considering factors such as thickness and material properties.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions which material, aluminum or plastic, would weigh more when both are designed to withstand a specific force before deforming or breaking.
  • Another participant suggests that understanding the density and strength of the specific materials in question is necessary for a proper comparison.
  • A different participant emphasizes the need for specificity regarding the types of plastic and aluminum, noting that variations in preparation methods could affect their properties.
  • One participant claims to have solved the issue by looking at flexural strength, indicating that it can be calculated with standard dimensions regardless of material density.
  • A suggestion is made to consult Materials Web for more detailed material properties.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the comparison of aluminum and plastic, as there are multiple viewpoints regarding the need for specificity in material types and properties.

Contextual Notes

The discussion highlights limitations in assumptions about material properties and the need for specific definitions of the types of aluminum and plastics being compared.

Bern123
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At parity of maximum resistance before failure (in the case of aluminum, deformation), weighs less aluminum or plastic?
Let me explain better: if i apply a force of 1000N on one end of a rectangular plate with a fixed fulcrum on other side, beyond this force both materials deforms / break. The plastic will obviously have a greater thickness of aluminum to counter the force. Now, will weigh more the plate of plastic or aluminum?

p.s. between all plastics, plexiglass have a good resistance?
 
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I think you'd need to look up the density and strength for whatever materials you're interested in.
This isn't really something that would be well known here on PF.
 
There are many different kinds of plastic you'd have to be specific about which one. I suspect there are different ways of preparing aluminum also (heat treating, peening etc.). You need to be more specific.
 
I've solved, I looked to the flexural strength that is calculated with standard dimensions independently of the material and density of material.
 

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