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An analytic study of tensile and puncture test behavior as a function of large‐strain properties
Author(s) -
Nimmer Ronald P.
Publication year - 1987
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.760270405
Subject(s) - materials science , composite material , strain hardening exponent , tensile testing , ultimate tensile strength , hardening (computing) , uniaxial tension , modulus , drop (telecommunication) , deformation (meteorology) , tension (geology) , rotational symmetry , mechanics , mechanical engineering , physics , layer (electronics) , engineering
The mechanics of “cold‐drawing” in ductile thermoplastics are examined analytically. The fundamental postyield, strain hardening behavior of these thermoplastics as defined by a true stress versus true (natural) strain relationship is related to macroscopic, large deformation behavior in unidirectional tension tests arid axisymmetric puncture tests. The phenomena of load‐drop after yield and propagating necks are examined with respect to tension tests and are related to draw strain and large deformation strain hardening modulus. In addition, these same fundamental material properties are also shown to have a significant effect upon the energy absorption capability of thermoplastics as measured by puncture tests.