Adding fibers to a liquid thread increases the viscosity, hence slows early stretching of thread, but it also alters later breakup dynamics and induces considerable variability in necking shapes.

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A unified experimental-computational study on ductile fracture initiation and propagation during small punch testing is presented. Tests are carried out at room temperature with unnotched disks of different thicknesses where large-scale yielding prevails. In thinner specimens, the fracture occurs with severe necking under membrane tension, whereas for thicker ones a through thickness shearing m...