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strain (ε)= (σ/E)-μσ/E, where E is Young's Modulus and μ is Poisson's ratio. However, I do not know how to obtain the strain. I have tried to use the arc-length, calculating strain as (l-lo)/lo where l is the measured arc length at a given pressure and lo is the arc-length at zero pressure. But this gives me a value for E that is about 5-fold larger than that obtained using the strip-stretch method. Please, please help. Is it possible to solve this without the use of tensor calculus? Desperately looking forward to a response. Many thanks.