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Strength enhancement in particulate solids under high loading rates
Author(s) -
Chandra Dipankar,
Krauthammer Theodor
Publication year - 1995
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290241205
Subject(s) - elastic modulus , strain rate , materials science , structural engineering , component (thermodynamics) , modulus , matrix (chemical analysis) , composite material , cement , mechanics , engineering , physics , thermodynamics
The so‐called ‘strain‐rate effect’ in any material has been investigated here from a structural dynamics point of view. Starting with lumped‐mass models (SDOF and 2‐DOF) and assuming a rate‐independent failure criterion, it is shown here how a high loading rate produces an effect of strength enhancement in any massive elastic material and how failure takes place in a stronger component of a system as the loading rate increases. Extrapolating the concept of an equivalent elastic modulus as introduced in lumped‐mass models and extending the analysis to a semi‐infinite elastic continuum, an algorithm has been schematized to evaluate an overall equivalent elastic modulus of a concrete body under the influence of high loading rate treating the concrete as a two‐component solid mixture consisting of cement paste matrix and aggregates.