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We use the steady-state solutions as the starting point before imposing a yield stress to simulate plastic yielding.
The flow rule relates the direction of plastic strain rate to the direction of strain rate, and yields the reduction of shear modulus after plastic yielding.
The mudcake is very soft/flexible compared to the rock and has a very small yield strength so that it undergoes perfectly plastic yielding under wellbore pressure.
The von-Mises criterion is used for plastic yielding.
The outrigger containing the maximum nodal displacement undergoes the largest plastic yielding at collapse.
High compressive force and density simultaneously reduced the share of elastic deformation and promoted plastic yielding.
Plastic yielding in magnesium alloys frequently involves the initiation of both slip and twinning events.
Budrovic et al. [12] observed very limited strain-hardening in nano-Ni due to suppressed accumulation of dislocations after the plastic yielding.
The obtained solutions allow to assess the time of the initial yielding at the bore of the tube and the time of fully plastic yielding.
Microscopic failure modes differ depending on the loading state: shear failure is due to global plastic yielding while plastic localization occurs under uniaxial loads.
Compared to the ambient air cell structures, the composites of internally pressurized or fluid-filled cells show increased compressive stiffness and delayed onset of plastic yielding.
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