Simulation of the transient behavior of matter with characteristic geometrical variations and defects irradiated by nanosecond laser pulses using FEASimulation of the transient behavior of matter with characteristic geometrical variations and defects irradiated by nanosecond laser pulses using FEA Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2018-11-022016enThe thermomechanical transient response of matter illuminated by nanosecond laser pulses is modeled and simulated using the Finite Element Analysis (FEA). Matter's behavior is numerically described by a three-dimensional (3D) multiphysics, coupled thermal-structural, transient FEA, experimentally validated, model. FEA offers substantial insights into the materials' micro-mechanical behaviour providing detailed information for the spatiotemporal evolution of acoustic waves. In this computational approach the impact of the geometric characteristics of the modeled metallic films to the generation and propagation of the ultrasonic waves, in relation to temperature, is investigated. The study is expanded to the dynamic reactions of matter in the presence of surface and solid volume defects and enclosures e.g.: gaps, holes or bubbles. The transient behavior of matter in the time and the space solution domains is obtained by the FEA model and presented.http://creativecommons.org/licenses/by/4.0/157-16014th International Conference on Fracture and Damage MechanicsKey Engineering Materials Kaselouris Evangelos Κασελουρης Ευαγγελος Skarvelakis Emmanouil Σκαρβελακης Εμμανουηλ Nikolos Ioannis Νικολος Ιωαννης Stavroulakis Georgios Σταυρουλακης Γεωργιος Orphanos Yannis Bakarezos Efthimios Papadogiannis, Nikolaos 1982- Tatarakis Michael K. Papadimitriou Vasileios Παπαδημητριου Βασιλειος Trans Tech Publications Finite Elements Laser-matter interactions Matter defects Metallic films