The failure process ahead of a mode I crack advancing in a ductile thin metal plate or sheet produces plastic dissipation through a sequence of deformation steps that include necking well ahead of the crack tip and shear localization followed by a slant fracture in the necked region somewhat closer to the tip. The objective of this paper is to analyze this sequential process to characterize the...

The fracture initiation in ductile materials is governed by the damaging process along the plastic loading path. A new damage plasticity model for ductile fracture is proposed. Experimental results show that fracture initiation in uncracked ductile solids is sensitive to the hydrostatic pressure and is dependent on the Lode angle. The damage plasticity model is established on a "cylindrical dec...

The identification of homologies between protein sequences is a central problem in molecular biology and several algorithms have been proposed for accomplishing this task. The Needleman-Wunsch Algorithm and its close variant, the SmithWaterman dynamic programming methods, solve the problem exactly in quadratic time and space. However, due to the massive amount of data involved in sequence-to-da...

Grid Computing is an emerging technology to provide high performance computing in a virtual organization composed of a large number of computers connected through web based technologies. We have implemented a parallel version of the Needleman-Wunsch algorithm for handling the DNA matching and alignment problem. We have presented the Needleman Wunsch algorithm for global alignments of sequences ...

Tensile and compression tests were carried out on a ductile cast iron for temperatures up to 1073 K. The damage caused inside and around graphite nodules was evaluated as a function of the local equivalent plastic strain by using microstructural quantifications. The mechanical properties are strongly dependent on a temperature above 773 K. Concerning tensile behavior, an evolutional law issued ...

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The intergranular crack propagation of the lamellar structure β titanium alloys is investigated by using a modified Gurson-type damage model. The representative microstructure of the lamellar alloy, which consists of the soft α phase layer surrounding the hard grain interiors, is generated based on an advanced Voronoi algorithm. Both the normal fracture due to void growth and the shear fracture...