Load Displacement to stress strain

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Discussion Overview

The discussion revolves around the process of creating a stress-strain curve from tensile data, specifically focusing on the conversion of load and displacement measurements into stress and strain values. The context is a homework problem involving material properties of PVC.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant describes their method of calculating stress by multiplying load by 9.8 and dividing by the cross-sectional area, and calculating strain by dividing displacement by gauge length.
  • The same participant reports obtaining a maximum stress of around 65,000,000 pascals at approximately 40% strain for PVC and questions the validity of this result.
  • Another participant notes that the reported stress seems low compared to steel's weakest strength, suggesting a comparison with independent sources for verification.
  • A further reply encourages checking material specifications for PVC on a specific website to validate the results.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the accuracy of the calculated stress value, with some suggesting that the results may not align with known material properties. No consensus is reached on the correctness of the calculations or the reported values.

Contextual Notes

Limitations include potential discrepancies in material properties, dependence on accurate measurements, and the need for careful interpretation of tensile data.

8-)
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Hello, so here is my problem.

Homework Statement



I am given tensile data, which is displacement (mm) and load (kgf). also I am given width(mm), thickness(mm), gauge length (mm) and cross-head speed (mm/min). How do i make a stress strain curve from this?


The Attempt at a Solution



So far i have multiplied width by thickness to find cross sectional area (in metres squared). Then i divide load (kgf) *9.8/cross sectional area (m^2) to find stress. and displacement (metres) over gauge length (metres) to find strain. I am getting around 65,000,000 pascals for maximum stress at around 40% strain. its for PVC. does that make sense?

thanks!
 
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not compared with steel whose weakest strength would be around 250,000 pascals. (Check this yourself from some independent source)
 
Yeah it seemed off, where am i messing up?
 
If you search www.matweb.com for PVC, and read the material specs carefully, you may find data to compare with your results.
 

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