Stored energy function and compressibility of compressible rubberlike materials under large strain

摘要: By using new invariants in the theory of finite elasticity an expression is obtained for stored energy function slightly compressible materials which effects distortional change (change shape) and volume are clearly separated. The volume‐related terms expressed as a third invariant Γ3, classical compressibility K0, induced anisotropy effective due to large deformations. After evaluating terms, data on pressure, volume, uniaxial stress‐strain, ΔV/V0 versus strain natural rubber from literature, it shown that contribution total stress observed simple tensile experiment can be separated contribution, even at strains.