Dynamic loading characteristics in metals and composites
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Authors
Tan, Kian Sing.
Subjects
Advisors
Kwon, Young
Date of Issue
2009-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
This study investigates the mechanical characteriztics of aluminum alloy AA3003-H14 when it is subjected to dynamical axial loads at low strain rates of less than 1s-1. The tensile experiments show that both the ultimate and yield stresses as well as the absorbed strain energy, increase with strain rate. Moreover, the strains at yield, ultimate load and fracture show positive sensitivity to strain rate. On the other hand, when the material is subjected to dynamic loading rates of more than 10-1 s-1, the elastic modulus diminishes as the strain rate increases, while both normalized yield and ultimate stresses increase noticeably. It is also appreciated that the amount of plastic strain energy accumulated in a ductile material in its loading time history is useful as a failure criterion for the prediction of failure. Finally, a failure criterion is proposed for loading with varying strain rates.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
xiv, 39 p. ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.