Prediction of the nonlinear creep and long-term strength of isotropic and anisotropic polymer materials

1986 ◽  
Vol 18 (7) ◽  
pp. 878-885
Author(s):  
V. V. Shcherbak ◽  
A. Ya. Gol'dman
Keyword(s):  
Polymer Materials ◽  
Nonlinear Creep ◽  
Term Strength

Long term strength and safety in steep soil slopes reinforced by polymer materials

1988 ◽  
Vol 7 (1-2) ◽  
pp. 81-118 ◽  
Author(s):  
R JEWELL ◽  
J GREENWOOD
Keyword(s):  
Polymer Materials ◽  
Term Strength ◽  
Soil Slopes

Problems in the prediction of the long-term strength of polymer materials. A review

1980 ◽  
Vol 15 (4) ◽  
pp. 440-449
Author(s):  
A. G. Adamovich ◽  
Yu. S. Urzhumtsev
Keyword(s):  
Polymer Materials ◽  
Term Strength

Machine for investigating creep and long-term strength of polymer. Materials in liquid media at elevated temperatures

1972 ◽  
Vol 6 (1) ◽  
pp. 86-87
Author(s):  
Yu. V. Kolevatov ◽  
A. I. Soshko ◽  
N. G. Kalinin ◽  
T. Yu. Stefyuk ◽  
A. N. Tynnyi
Keyword(s):  
Elevated Temperatures ◽  
Polymer Materials ◽  
Term Strength ◽  
Liquid Media

scholarly journals A Nonlinear Creep Damage Model of Layered Rock under Unloading Condition

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ruihong Wang ◽  
Yuzhou Jiang ◽  
Chao Yang ◽  
Fei Huang ◽  
Yuxuan Wang
Keyword(s):  
Rock Specimen ◽  
Damage Model ◽  
Creep Damage ◽  
Nonlinear Creep ◽  
Term Strength ◽  
Layered Rock ◽  
Rock Creep ◽  
Creep Time ◽  
Creep Damage Model

Triaxial unloading creep tests of layered rock specimen of Jinping II hydropower station were carried out using the rock creep testing machine; thus the creep deformation curves under different confining pressures were acquired. The test results showed that, in addition to the obvious unloading creep characteristics of rock specimen, the nonlinear accelerating creep deformation emerged under the last stage confining stress condition, and the whole creep curves presented the typical rock creep three stages. On the other hand, the Burgers creep model constitutive equations under the three-dimensional stress state were also deduced. Based on the creep test data, through identifying the creep parameters using the optimized algorithm, the corresponding parameters of triaxial creep constitutive model were obtained. By comparative analysis of creep parameters, it can be concluded that creep parameters nonlinearly degraded with the decrease of confining pressure gradually. Moreover, when the load is below the long-term strength of rock, the creep parameters are only related to the unloading ratio, while in the case that the load is larger than the long-term strength of rock, the unloading creep parameters are related to both unloading ratio and creep time. According to the creep parameters under the first-stage stress level, and through introducing unloading ratio damage factor to describe the degrading rule of creep parameters on other stress levels, the method of uniformity determining the creep parameters was proposed. It was assumed that the damage degree in rock interior was relative to both unloading ratio and creep time; a nonlinear creep damage model of rock under unloading was proposed, which could better reflect the nonlinear characteristics of rock creep. The results showed that rock nonlinear creep damage model achieved perfectly consistent results with the creep test.

Estimation of the long-term strength of polymer materials under arbitrary loading histories

1999 ◽  
Vol 35 (5) ◽  
pp. 389-394
Author(s):  
Yu. Potapov ◽  
S. Yermolov
Keyword(s):  
Polymer Materials ◽  
Term Strength ◽  
Arbitrary Loading

Subcritical Crack Growth and Long-Term Strength in Rock and High-Strength and Ultra Low-Permeability Concrete

2009 ◽  
Vol 58 (6) ◽  
pp. 525-532 ◽  
Author(s):  
Yoshitaka NARA ◽  
Masafumi TAKADA ◽  
Daisuke MORI ◽  
Hitoshi OWADA ◽  
Tetsuro YONEDA ◽  
...  
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
High Strength ◽  
Low Permeability ◽  
Term Strength
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