Numerical modeling of acoustic emission in laminated tensile test specimens (Q5945380)

The author examines the transient wave motion in laminated tensile test speciments due to transverse matrix cracking and fiber fracture. The fiber fracture is modeled using a time-dependent volume force, and matrix cracking is described by a volume force depending on both position and time. Wave propagation is modeled by dividing the cross-section into finite elements, leading to a system of ordinary differential equations in nodal displacements, which are functions of the axial coordinate and time. The system is solved by using Fourier transforms, and the solution of the resulting algebraic problem is written as a superposition of eigenmodes. Contour integration, residue calculus and fast Fourier transform are used to invert the transforms.