24-DOF quadrilateral hybrid stress element for couple stress theory.

*(English)*Zbl 1398.74365Summary: A 24-DOF quadrilateral hybrid stress element for couple stress theory is proposed in this study. In order to satisfy the equilibrium equation in the domain of the element, the \(21\beta\) Airy stress functions are chosen a assumed stress interpolation functions, and beam functions are adopted as the displacement interpolation functions on the boundary. This element can satisfy weak \(\mathrm C^0\) continuity with second-order accuracy and weak \(\mathrm C^1\) continuity simultaneously. So the element can pass the enhanced patch test of a convergence condition. Moreover, the reduced integration and a stresses smooth technique are introduced to improve the element accuracy. Numerical examples presented show that the proposed model can pass the \(\mathrm C^{0-1}\) enhanced patch test and indeed possesses higher accuracy. Besides, it does not exhibit extra zero energy modes and can capture the scale effects of microstructure.

##### MSC:

74S05 | Finite element methods applied to problems in solid mechanics |

74B99 | Elastic materials |

74C99 | Plastic materials, materials of stress-rate and internal-variable type |

74A30 | Nonsimple materials |

##### Keywords:

couple stress theory; quadrilateral hybrid stress element; enhanced patch test; scale effect
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\textit{X. Ma} and \textit{W. Chen}, Comput. Mech. 53, No. 1, 159--172 (2014; Zbl 1398.74365)

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