Modeling of shock propagation and attenuation in viscoelastic components

Protection from the potentially damaging effects of shock loading is a common design requirement for diverse mechanical structures ranging from shock accelerometers to spacecraft. High damping viscoelastic materials are employed in the design of geometrically complex, impact-absorbent components. Since shock transients are characterized by a broad frequency spectrum, it is imperative to properly model frequency dependence of material behavior over a wide frequency range. The Anelastic Displacement Fields (ADF) method is employed herein to model frequency-dependence within a time-domain finite element framework. Axisymmetric, ADF finite elements are developed and then used to model shock propagation and absorption through viscoelastic structures. The model predictions are verified against longitudinal wave propagation experimental data and theory

Journal of Vibration and Acoustics Reliability of the Piezoelectric Layer Application to Vibration and Noise Controls

In this Tech Brief, the local curvature induced peeling tensile stress within the piezoactuator patch is qualitatively estimated, and the detailed stress analysis for an ACLD beam is conducted to show the high stresses concentration at the edges of a piezoactuator patch