Thickness Dependence of crack initiation and propagation in stacks for piezoelectric microelectromechanical systems

Kathleen Coleman , Raul Bermejo (1, 2) , Dominique Leguillon (3) , Susan Trolier-Mckinstry (2)

1 MUL - Montanuniversität Leoben
2 Penn State - Pennsylvania State University
3 DALEMBERT - Institut Jean Le Rond d'Alembert

The coupled criterion (CC) of finite fracture mechanics (FFM) is extended to assess crack initiation in PMMA specimens with holes under quasi-static loading considering nonlinear elastic (NLE) material model and considering the kinetic energy variation in the energy balance. If dynamic aspects are disregarded, the failure stress predicted using the CC for either linear elastic (LE) material model or NLE material model is underestimated compared to the one measured experimentally. A better representation of the failure stress variation as a function of the hole size is obtained considering constant crack velocity profiles and velocities in the range [550–900] m/s (LE material model) or [400–600] m/s (NLE material model). The predicted failure stresses also depend on the crack velocity profile.

Domaines: Mécanique [physics.med-ph]

Kathleen Coleman, Raul Bermejo, Dominique Leguillon, Susan Trolier-Mckinstry. Thickness Dependence of crack initiation and propagation in stacks for piezoelectric microelectromechanical systems. Acta Materialia, 2020, 191, pp.245-252. ⟨10.1016/j.actamat.2020.03.030⟩. ⟨hal-04691486⟩