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MegaDeth
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Calculating Young's Modulus from a range of values
- Thread starter MegaDeth
- Start date
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- Tags
- Modulus Range Young's modulus
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Discussion Overview
The discussion revolves around calculating Young's Modulus (E) from a range of load and displacement values for different materials, specifically steel and aluminum. Participants explore the implications of material properties on the calculation, including the presence or absence of a linear stress-strain relationship.
Discussion Character
- Homework-related
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- One participant seeks guidance on the best method to calculate Young's Modulus from load and displacement values, noting a decreasing trend in calculated values.
- Another participant mentions that the method of calculation may depend on the material being tested.
- A participant clarifies they are calculating E for both steel and aluminum and realizes they need to use the maximum load for their calculations.
- Discussion highlights that mild steel exhibits a linear stress-strain relationship, while aluminum does not have a clear yield point, complicating the calculation for aluminum.
- One participant asks how to calculate Young's Modulus for aluminum without a linear portion on the stress-strain graph.
- A suggestion is made to use the formula: Force divided by area times length divided by displacement.
- Further clarification is provided that aluminum does have a linear stress-strain relationship for small strains, but its behavior can be nonlinear at higher stress levels, affecting the calculation of Young's Modulus.
- A reference to measured stress-strain data for aluminum and other materials is shared for additional context.
Areas of Agreement / Disagreement
Participants express differing views on the behavior of aluminum under stress, particularly regarding its linearity and yield point. There is no consensus on the best method to calculate Young's Modulus for aluminum without a linear portion in the data.
Contextual Notes
Participants note the importance of understanding material properties and the implications of loading conditions on the calculation of Young's Modulus. The discussion reflects the complexity of determining E for materials that do not exhibit a clear linear relationship.