## Abstract

Mechanical balance laws for micropolar materials stage-2 are discussed on the basis of results of the previous report. The balance equations for mass, force and moment in stage-2 are derived by averaging the balance laws of stage-zero up to stage-2. It is indicated that one more balance law has to be considered, which is those of second-order moment, in order to let the balance equation system be a complete set. The missing equation is gives as the average of the balance equation for the above second-order moment of stage-zero. The authors define a new internal force characterizing the materials of stage-2 and name it “bicouple stress”. This is a second order moment due to the geometric mechanism of multimicrostructures of higher-stage micropolar materials. Furthermore, it is discussed that the bicouple stress extends the concept of bimoment in the theory of thin-walled structures to three-dimensional ones.

Original language | English |
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Pages (from-to) | 2363-2369 |

Number of pages | 7 |

Journal | Transactions of the Japan Society of Mechanical Engineers Series A |

Volume | 55 |

Issue number | 519 |

DOIs | |

Publication status | Published - 1989 |

Externally published | Yes |

## Keywords

- Balance Laws
- Bimoment
- Continuum Mechanics
- Higherstage
- Internal Rotation
- Microtorsional Rotation
- Polar Material
- Second-order Moment of Force

## ASJC Scopus subject areas

- General Materials Science
- Mechanics of Materials
- Mechanical Engineering