TY - JOUR
T1 - Dynamic shear rheology and structure kinetics modeling of a thixotropic carbon black suspension
AU - Armstrong, Matthew J.
AU - Beris, Antony N.
AU - Rogers, Simon A.
AU - Wagner, Norman J.
N1 - Funding Information:
Acknowledgments The authors acknowledge the support of the National Science Foundation through grant no. CBET 312146, the funding assistance from the US Army, and the Department of Chemistry and Life Science, US Military Academy. The views expressed herein are those of the authors and do not reflect the position of the US Military Academy, the Department of the Army, or the Department of Defense.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - The rheological characterization of a model, nearly ideal thixotropic carbon black suspension first proposed by Dullaert and Mewis (JNNFM 139: 21–30, 2006) is extended to include large amplitude oscillatory shear (LAOS) flow, shear flow reversal, and unidirectional LAOS flow (UD-LAOS). We show how this broader data set is useful for validating and improving constitutive models of thixotropy. We apply this new data to further test a recently developed structure-kinetics model, the Modified Delaware Thixotropy Model (Armstrong et al., J Rheol. 60: 433–450, 2016a), as well as to better understand the microstructural basis and validity of strain-rate superposition methods proposed for soft solids. This comparison identifies the limitations of models based on a scalar description of microstructure, which cannot fully capture the reversal of flow directionality inherent in LAOS flow. Further, we use the model to identify a possible microstructural justification for the hypothesized technique of strain-rate frequency superposition in soft solids.
AB - The rheological characterization of a model, nearly ideal thixotropic carbon black suspension first proposed by Dullaert and Mewis (JNNFM 139: 21–30, 2006) is extended to include large amplitude oscillatory shear (LAOS) flow, shear flow reversal, and unidirectional LAOS flow (UD-LAOS). We show how this broader data set is useful for validating and improving constitutive models of thixotropy. We apply this new data to further test a recently developed structure-kinetics model, the Modified Delaware Thixotropy Model (Armstrong et al., J Rheol. 60: 433–450, 2016a), as well as to better understand the microstructural basis and validity of strain-rate superposition methods proposed for soft solids. This comparison identifies the limitations of models based on a scalar description of microstructure, which cannot fully capture the reversal of flow directionality inherent in LAOS flow. Further, we use the model to identify a possible microstructural justification for the hypothesized technique of strain-rate frequency superposition in soft solids.
KW - Carbon black
KW - Constitutive modeling
KW - Large amplitude oscillatory shear
KW - Thixotropy
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U2 - 10.1007/s00397-017-1038-8
DO - 10.1007/s00397-017-1038-8
M3 - Article
AN - SCOPUS:85028847633
SN - 0035-4511
VL - 56
SP - 811
EP - 824
JO - Rheologica Acta
JF - Rheologica Acta
IS - 10
ER -