Results 211 to 220 of about 3,857 (239)

Gradient damage models applied to dynamic fragmentation of brittle materials

International Journal of Fracture, 2019
This paper is devoted to the use of gradient damage models in a dynamical context. After the setting of the general dynamical problem using a variational approach, one focuses on its application to the fragmentation of a brittle ring under expansion. Although the 1D problem admits a solution where the damage field remains uniform in space, numerical ...
Arthur Geromel Fischer, Jean-Jacques Marigo   +1 more
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Predicting the fragmentation survival probability of brittle spheres upon impact from statistical distribution of material properties

International Journal of Rock Mechanics and Mining Sciences, 2021
Abstract Fragmentation of rocks upon impact during rockfall is a phenomenon that is poorly understood, scarcely researched and difficult to predict. However, to adequately predict the outcomes of rockfall events, it is essential to know whether a given block is likely to fragment given the impact conditions and what will be the outcome of the ...
Guccione, David Ettore, Buzzi, Olivier, Thoeni, Klaus, Fityus, Stephen, Giacomini, Anna   +4 more
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A finite deformation continuum\discrete model for the description of fragmentation and damage in brittle materials

Journal of the Mechanics and Physics of Solids, 1998
Abstract A dynamic finite element analysis of large displacements, high strain rate deformation behavior of brittle materials is presented in total Lagrangian coordinates. A continuum\discrete damage model capable of capturing fragmentation at two size scales is derived by combining a continuum damage model and a discrete damage model for brittle ...
Espinosa, Horacio D., Zavattieri, Pablo D., Dwivedi, Sunil K.   +2 more
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Strain Rate Effects on Fragment Size of Brittle Materials

2008
A one-dimensional (1D) analytic model was developed to study the fragmentation phenomenon of ceramics under dynamic loading. The model integrates the elastic stress wave propagation with the cohesive crark initiation and growth process. Both the average fragment size and the fragment size distribution can be calculated using this model.
Fenghua Zhou, Jean-Francois Molinari, Kt Ramesh   +2 more
openaire   +1 more source

Space-time scale invariance in dynamically fragmented quasi-brittle materials

Physical Mesomechanics, 2016
The paper reports on a study to investigate the influence of load intensity and material structure on statistical regularities of fragmentation in ZrO2-based ceramics differing in porosity. The study was performed on a modified split Hopkinson pressure bar system and allowed a comparative analysis of dynamic stress-strain curves and statistical ...
M. M. Davydova, S. V. Uvarov, O. B. Naimark   +2 more
openaire   +1 more source

A micro-mechanical modeling approach for dynamic fragmentation in brittle multi-phase materials

International Journal of Solids and Structures, 2018
Abstract Understanding the response of structures exposed to high rate mechanical loading is important for improved protection and security. Modeling the behavior of these structural materials and components can be performed at different scales. However, a detailed picture of the behavior of the material under high strain rates can only be gained by ...
David Cereceda, Dmitriy Kats, Nitin Daphalapurkar, Lori Graham-Brady   +3 more
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Rock-like brittle material fragmentation under coupled static stress and spherical charge explosion

Engineering Geology, 2017
Abstract Theoretical analysis and laboratory tests were performed to investigate the fragmentation of rock-like materials under coupled static stress and spherical charge explosion. The variations of the explosion crater shape and volume were studied.
Fengpeng Zhang, Jianyu Peng, Zhaoguo Qiu, Qingkai Chen, Yuanhui Li, Jianpo Liu   +5 more
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High Performance Computing Simulations of Dynamic Fragmentation in Brittle Materials

2015
The aim of this thesis is to investigate the mechanisms behind dynamic fragmentation. This phenomenon occurs in a material when a blast or impact loading nucleates multiple cracks, whose propagation and coalescence break the specimen into fragments. Although since the beginning of the last century this topic has been well studied in many fields ranging
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Dynamic Strength and Fragmentation Experiments on Brittle Materials Using Theta-Specimens

2016
Characterization of the strength and fragmentation response of brittle materials poses unique challenges related to specimen gripping and alignment. These challenges are often exacerbated when the characterization is to be conducted at elevated strain rates.
Jamie Kimberley, Antonio Garcia
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One 3D adaptive fragmentation procedure for the explicit simulation of brittle material cracking

2008
Realistic modeling of fragmentation procedures is one of the fundamental tasks in modern computational engineering simulations. In particular, 3D crack propagation with minimal incorporation of restrictions to the crack path is still a challenge. The approach presented in this work will be used to model failure and cracking of brittle materials like ...
S. H. Reese, P. Wriggers
openaire   +1 more source