OOF: Finite Element Analysis of Microstructures

trigonalCrack

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Subsections

trigonalCrack

A trigonalA element (Section 4.5.7) with the griffith2 fracture criterion (Section 4.5.11).

orientation: The orientation of the trigonal element before it mutates. See Section 4.3.
thermoelastic coefficients: Before mutation, the components of the stiffness matrix are those of the trigonalA element (Section 4.5.7): c11, c12, c13, c14, c15, c33, and c44. The two independent coefficients of thermal expansion are alpha11 and alpha33.
gamma: The surface energy of the crack.
knockdown1: The factor which multiplies the rotated stiffness matrix's $C_{zzzz}$ component during a mutation. [dimensionless]
knockdown2: The factor which multiplies the rotated stiffness matrix's remaining $C_{ijkl}$ components for at least one of ijkl=z during a mutation. [dimensionless]
only_once: If true, an element which has been damaged during one mutate command will not be damaged further on subsequent mutate commands. If false, the knockdown factors may be applied multiple times. Default: false

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