Load Displacement to stress strain

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SUMMARY

The discussion focuses on creating a stress-strain curve from tensile data involving displacement and load for PVC material. The user successfully calculated the cross-sectional area and derived stress using the formula: stress = (load * 9.8) / cross-sectional area. They reported a maximum stress of approximately 65,000,000 pascals at 40% strain, which raised concerns about the accuracy of their results compared to known values for PVC. Participants suggested verifying the calculations against material specifications from sources like MatWeb.

PREREQUISITES
  • Understanding of tensile testing and stress-strain relationships
  • Familiarity with unit conversions (kgf to pascals)
  • Knowledge of material properties, specifically for PVC
  • Ability to use online material databases like MatWeb
NEXT STEPS
  • Review the calculation of stress and strain in tensile testing
  • Explore the properties of PVC using MatWeb for accurate comparisons
  • Learn about the significance of cross-sectional area in stress calculations
  • Investigate common errors in stress-strain curve generation
USEFUL FOR

Students in materials science, engineers conducting tensile tests, and professionals analyzing the mechanical properties of polymers like PVC.

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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