Abstract This paper presents an experimental and numerical study on quasi-static ductile tearing of thin plates the aluminium alloy AA6016 in three tempers. Depending temper, main fracture mechanism plate tests changes from grain boundary failure to coalescence voids nucleated at constituent particles. The experiments are complemented by nonlinear finite element simulations using enriched Gurso...

The nucleation of microvoids from second phase particles in an AlMgSi alloy has been investigated. The work has comprised detailed stress analyses of elastic particles situated in an elastic-plastic matrix as well as damage mechanics analyses of the ductile fracture behaviour of smooth and notched axisymmetric tensile specimens. Based on the micromechanical analyses of isolated particles, gener...

This work deals with the application of the micromechanical Gurson-Tvergaard (GT) model to the determination of the residual strength of analuminumflat stiffened panel (2024 T3) with a central through crack, by means of finite element simulations. The load condition is represented by a monotonic traction along the direction orthogonal to the crack plane. The used Finite Element code is WARP 3D,...

 To understand the value of aligning genes and recognize the practical applications of this technique.  To gain familiarity with the use of Web-based alignment tools to explore sequence similarity and understand how to modify their parameters.  To know how the Needleman-Wunsch algorithm optimally aligns any two sequences.  Understand how the Needleman-Wunsch algorithm can be modified to yie...

Herbert L. Needleman, MD, pediatrician, child psychiatrist, and hero for children’s environmental health, died in Pittsburgh, Pennsylvania, on 18 July 2017. Needleman was one of the world’s foremost researchers on lead poisoning. He conducted seminal studies that illuminated with great clarity the enduring impacts of lead on children’s health. He was a deeply moral man with a strong sense of so...

In this study, a numerical approach was proposed to predict the failure of resistance spot welds, into which theoretical and empirical models as well finite element (FE) model are integrated. approach, hardness welds first evaluated estimated then used determine local mechanical properties. The weld geometry boundary conditions were faithfully followed when generating FE model. A Gurson-type da...