Question: A tension test is conducted to determine the stress-strain behaviour of rubber. The experimental data of o in MPa and strain & are given

A tension test is conducted to determine the stress-strain behaviour of rubber. The experimental data of o in 

A tension test is conducted to determine the stress-strain behaviour of rubber. The experimental data of o in MPa and strain & are given as: 3 a 2 5.8 2.3 6.0 2.7 7.1 3.1 9.2 3.5 15.3 4 20.7 4.4 26.7 4.6 31.1 Using the third-order polynomial interpolation for stress calculation, find the stress at & = 0.3.

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