Research

Metal plasticity

Results of the simulations of the additively manufactured AlSi10Mg components: force–displacement curves with solid elements (a) and deformed shape at failure (b), and force–displacement curves with shells (c) and deformed shape at failure (d). Dots indicate failure.

Longitudinal and transverse logarithmic strain fields at the onset of fracture on the surface of the tensile specimens at 0, 45, and 90 degrees with respect to the printing direction, obtained by DIC.

Comparison of the von Mises and Hershey yield surfaces (a) and the fracture loci of the Cockroft–Latham criterion adopting one or another surface for the material calibrated at 90 degrees with the printing direction (b). Plane stress conditions are assumed in both figures .

Soft tissue biomechanics

Contour plots of the circumferential stresses in the intact and in three-layered models of idealized aneurysms for asymmetry values of β=1.0,β=0.6 and β = 0.2 during peak systolic (MPa).

Sagittal view of the typical mesh used for the simulations of the three-layered aneurysms. This geometry corresponds to β = 0.2.

Through-the-thickness circumferential stresses in the three-layered (solid curves) and intact (dashed curves) AAA wall

Injectable biologics

Schematic representation of an injection in the subcutaneous space. The simplified anatomic illustration shows the different layers of the tissue, including the epidermis, dermis, subcutaneous tissue, and muscle.

Cutlines of the numerical solution for the fluid pressure (A) and vertical displacement (B) along a line parallel to the z-axis that goes through the injection point at different times for a constant hydraulic conductivity of K=1000 mm2 MPa−1 s−1. The injection point is located at z=96.

Snapshots of the spatial distribution of fluid pressure and velocity for constant permeability taking E=10 kPa and K=1000 mm2 MPa−1 s−1. The rest of the parameters take the reference values. We also show the maximum vertical displacement at each time. The white dashed line depicts the position of the upper surface at t=0 s. A deformation scale factor of 5 has been applied to all the figures.

Fluid-Structure interaction

Coupled fluid-solid approach to modeling pulsatile blood flow in aneurysmal arteries using the Arbitrarian Lagrangian Eulerian (ALE) strategy. The solid part is modeled as an anistropic hyperelastic material by means of the HGO model with two families of collagen fibers helically arranged. The pressure and velocity boundary conditions are depicted on the right.

Fluid mesh

Solid mesh

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