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Shear deformation under impact conditions
Author(s) -
Sjoerdsma S. D.,
Boyens J. P. H.,
Mooij J. J.
Publication year - 1985
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760250408
Subject(s) - materials science , simple shear , plasticity , shear (geology) , shear rate , falling (accident) , yield (engineering) , deformation (meteorology) , composite material , mechanics , shear stress , structural engineering , geotechnical engineering , rheology , geology , engineering , medicine , physics , environmental health
The deformation behavior that results from falling weight impact testing with flat‐headed darts is analyzed in terms of elasticity and plasticity. From a comparison of the time and temperature dependence of the yield stress that is observed during a falling weight test with the same dependences of the yield stress during simple shear tests, it is concluded that the use of flat‐headed darts results in strong shear loading. Consequently most of the plastic deformation takes place by shear flow. Of practical interest is that this leads to a simple dependence of the yield stress during the impact test and the impact energy on the plate thickness. Furthermore, for a number of cases this result allows a direct conversion of temperature effects to time effects. In practice this means that it is possible to simulate the impact behavior at very high impact rates simply by performing impact tests at lower temperatures.