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中文核心期刊

关于时空标架变换和物质标架无关性原理

On Euclidean transformations of Space-Time Frames and Principle of Material Frame Indifference

  • 摘要: 建立了欧几里德标架无关性的一般表述与某一参考标架\phi下作相对刚体运动的一般曲线坐标、分量表述之间的关系,从而使欧几里德标架无关性的张量表述有相应的分量表述形式.建立这种联系的基础是, 参考标架\phi^\ast 下描述的运动在参考标架\phi 中某坐标系下的分量结果, 对应于\phi下另一相对该坐标系作相同刚体运动的坐标系下描述\phi观测的运动的分量结果. 通过例子说明了Truesdell和Noll用等价动力过程,关于物质标架无关性原理的陈述,比Svendsen和Bertram及Liu的本构关系在参考标架变换下的形式不变性更合理且方便,尤其是对微分方程形式的本构关系更是如此.

     

    Abstract: The main purpose of the present paper is to obtain the relation between the abstract presentation of Euclidean objectivity and its component representation with respect to the general curvilinear coordinate systems with a relative rigid motion under a fixed frame of reference, so that the tensor representation of Euclidean objective quantity has its component form. This relation is based on the fact that an objective quantity under the frame of reference with respect to the fixed coordinate system of frame of reference has the same component with the objective quantity under the frame of reference relative to another coordinate system of with the same relative rigid motion as that of and to the fixed coordinate system of . On the other hand, it is exemplified in the present paper that the principle of material frame – indifference with the admissible equivalent dynamic processes of a body by Truesdell and Noll (1965) 14 is more convenient than the form-invariance of constitutive functionals by Svendsen and Bertram (1999) 13 and Liu (2004)4, especially for the rate-form constitutive equations.

     

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