Stress Strain Curve: Converting Psi and In/In to MPa and mm/mm

AI Thread Summary
The discussion focuses on converting a stress-strain curve from Psi and in/in to MPa and mm/mm. It confirms that while stress in Psi can be converted to MPa by multiplying by 0.00689475729, strain is a unitless quantity and does not require conversion. Participants agree that strain can be represented in various units without affecting its value. The conversation emphasizes the straightforward nature of this conversion process. Overall, the key takeaway is that only the stress value needs conversion, while strain remains unchanged.
shinoy
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Hi All,

I have a stress strain curve, which have strain(in/in) on x-axis and stress in Y axis(Psi).
Here I want to conver the curve to stress(MPa) and strain (mm/mm). I know that Psi can be converted by multiplying the digit by 0.00689475729. But in this case I need to change the strain value? As strain is a unitless quantiy I can use as it is?
 
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Hi shinoy, welcome to PF.

You are correct; strain has no units, so it doesn't need to be converted (equivalently, it can be labeled mm/mm, yard/yard, or anything you like).
 
Mapes said:
Hi shinoy, welcome to PF.

You are correct; strain has no units, so it doesn't need to be converted (equivalently, it can be labeled mm/mm, yard/yard, or anything you like).

Hi Mapes,

Thank your swift reply.
 

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