<正> With respect to small deformation gradient tensor,the displacement gradientmoduli Φ_(iLjM)~* at the reference system are introduced by taking into account the rela-tion of the first Piola-Kirchhoff stress ...<正> With respect to small deformation gradient tensor,the displacement gradientmoduli Φ_(iLjM)~* at the reference system are introduced by taking into account the rela-tion of the first Piola-Kirchhoff stress tensor T_(iL) and displacement gradient tensor u_(jM)in the paper.Then the specific expression of Φ_(iLjM) is derived by the comparison of theexpansion terms of Helmholtz free energy H.Finally,the coefficients (?)_(iLjM) related toΦ_(iLjM) are obtained by using ultrasonic measurement and the elastic tensor C_(iLjM) whichdepends on (?)_(iLjM) and initial stresses in the reference system are given.展开更多
文摘<正> With respect to small deformation gradient tensor,the displacement gradientmoduli Φ_(iLjM)~* at the reference system are introduced by taking into account the rela-tion of the first Piola-Kirchhoff stress tensor T_(iL) and displacement gradient tensor u_(jM)in the paper.Then the specific expression of Φ_(iLjM) is derived by the comparison of theexpansion terms of Helmholtz free energy H.Finally,the coefficients (?)_(iLjM) related toΦ_(iLjM) are obtained by using ultrasonic measurement and the elastic tensor C_(iLjM) whichdepends on (?)_(iLjM) and initial stresses in the reference system are given.
