TY - GEN
T1 - Characterization and modeling of PEEK in histories with reverse loading
AU - Li, Wenlong
AU - Gazonas, George
AU - Brown, Eric N.
AU - Rae, Philip J.
AU - Negahban, Mehrdad
N1 - Funding Information:
Acknowledgement Authors appreciate the supported from the US Army Research Laboratory (Contract Number W911NF-11-D-0001-0094). The tests were conducted in the Stress Analysis Center of University of Nebraska-Lincoln.
Publisher Copyright:
© 2018, The Society for Experimental Mechanics, Inc.
PY - 2018
Y1 - 2018
N2 - Traditional viscoelastic models for describing polymer response during large deformations are normally designed to capture the response during monotonic loading and typically have difficulty capturing the response after a reversal of the deformation process. In particular, most models pay little attention to capturing the equilibrium stress, the anisotropy developed after plastic flow in the elastic response, and the characteristics of the yield and subsequent flow after reversal of the loading. To characterize these events, the thermo-mechanical response of PEEK is studied during shear histories that have one or more points at which the strain rate is reversed. In particular, using digital image correlation (DIC) methods, the response of PEEK is captured during processes that subject the material to histories that reverse the straining direction one or more times. These studies show that the response of PEEK in monotonic loading is very different from that observed after reversing the loading, and also from that observed in further cycling. Yet, after multiple cycles of loading and reverse loading, if the loading is then continue beyond the point that loading reversal was initiated in the cycling, the response after this point returns to that of the initial monotonic loading.
AB - Traditional viscoelastic models for describing polymer response during large deformations are normally designed to capture the response during monotonic loading and typically have difficulty capturing the response after a reversal of the deformation process. In particular, most models pay little attention to capturing the equilibrium stress, the anisotropy developed after plastic flow in the elastic response, and the characteristics of the yield and subsequent flow after reversal of the loading. To characterize these events, the thermo-mechanical response of PEEK is studied during shear histories that have one or more points at which the strain rate is reversed. In particular, using digital image correlation (DIC) methods, the response of PEEK is captured during processes that subject the material to histories that reverse the straining direction one or more times. These studies show that the response of PEEK in monotonic loading is very different from that observed after reversing the loading, and also from that observed in further cycling. Yet, after multiple cycles of loading and reverse loading, if the loading is then continue beyond the point that loading reversal was initiated in the cycling, the response after this point returns to that of the initial monotonic loading.
KW - Cyclic loading
KW - Plastic flow
KW - Poly-ether-ether-ketone (PEEK)
KW - Reverse loading
KW - Shear
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U2 - 10.1007/978-3-319-63393-0_11
DO - 10.1007/978-3-319-63393-0_11
M3 - Conference contribution
AN - SCOPUS:85033491980
SN - 9783319633923
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 65
EP - 69
BT - Challenges in Mechanics of Time Dependent Materials - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics
A2 - Silberstein, Meredith
A2 - Arzoumanidis, Alex
A2 - Amirkhizi, Alireza
PB - Springer New York LLC
T2 - Annual Conference and Exposition on Experimental and Applied Mechanics, 2017
Y2 - 12 June 2017 through 15 June 2017
ER -