Under dynamic loads, structures experience stress both on the outer fibers and internally. The main objective of this thesis is the numerical and experimental analysis of the stress state in the internal fibers of 3D printed PLA structures and the detection of fractures under prolonged cyclic loading, also known as fatigue. Parametric modeling was conducted in Ansys using the finite element method (FEM) to analyze the mechanical properties of 3D printed PLA structures under dynamic loads and assess the impact of parametric changes on these properties. A comprehensive approach was used, combining parametric modeling, simulations, experimental testing, and modal analysis to determine natural frequencies and modes. Experimental testing with a high-speed camera at points of maximum stress enabled the detection of fractures. The results revealed key points of stress and fractures within the structure.
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