What is THEORETICAL STIFFNESS?

Estimate of the stiffness of any material from atomic/molecular data. For example it can be done for completely oriented polymer chains from a knowledge of chain structure, bond lengths and angles, and force constants. For high-density polyethylene, calculation gives a theoretical tensile modulus along the chains of 31 GPa and about 9 GPa perpendicular to the chains. See theoretical strength and panel on High- performance polymers,


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