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CiMMS Seminar

18.04.2018 16:00 - 18:00
Texas A&M University


A general overview on multiple necking and fragmentacion problems in ductile solids subjected to

CIMMS Seminar. Wednesday, April 18, 2018 | 4:00 p.m.

Understanding the fragmentation of ductile solids and structures subjected to high velocity impacts or blast loadings has importance in aerospace industry, military applications, civil engineering and geophysical applications. Meteoric cratering, explosive behaviour of projectiles or orbital debris impact on spacecraft structures are examples of situations in which to preserve the integrity of structures subjected to strain rates within the range >104 s-1 becomes crucial. From the early studies in this area –dating in the late 18th century– to the present time, an intense debate on the causes which reside behind the fragmentation of ductile solids

has been carried out. In this seminar we will discuss canonical problems of rings (bars) and cylinders (plates) subjected to dynamic radial expansion. The principal advantage of the rapidly expanding ring and cylinder tests is that, due to the symmetry of the problems, the effects of wave propagation are nearly eliminated before flow localization occurs in the form of multiple necks which ultimately lead to the fragmentation of the sample.

Within this framework, we have developed a combined analytical / numerical methodology based on linear stability analyses and finite element calculations that provides new insights into the critical factors that control the processes of multiple necking and fragmentation. Our results suggest that the combination of inertia and stress multiaxiality effects inside a necked section lead to the promotion of a finite number of wavelengths that, at sufficiently high strain rates, determine/control, at least up to some extent, the neck spacing and fragments size. These results argue for the inclusion of a deterministic component within the fragmentation

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Nonlinear Solid Mechanics Group

Nonlinear Solid Mechanics Group

The NSM group, formed by 3 researchers and 4 PhD students, is part of the Department of Continuum Mechanics and Structural Analysis at the University Carlos III of Madrid. Research lines include mechanical characterization at high strain rates, formulation of constitutive theories and analytical models for instabilities in ductile materials, nonlinear vibration in elastic structures, etc. The group has 5 on-going competitive grants, 2 National and 3 European, including an ERC Starting Grant.

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