Thanks William. I might add that in your example below, the resulting strain is of type compression since the rib is measured to be shorter after your 150 psi stress. Cheers RicB --------- Stress = unit force, the amount of force, or, load acting on a unit of area Stress = P/A P = load; A = area. Usually in pounds per square inch (psi). Strain = unit deformation, deformation per unit of original length. Strain is measure at a particular load, and expressed in Inches per Inch, without canceling the units. For example, we take a rib of original length 39 inches. When subjected to a load of 150psi stress the rib then is measured to be 38.99 inches. The strain would be: .01 inches/39 inches = 0.0003 in./in. I honestly hope that might help things, not just add to the esoterics of this one. Regards, William R. Monroe
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