scholarly journals Undrained creep behavior of CO2 hydrate-bearing sand and its constitutive modeling considering the cementing effect of hydrates

2022 ◽  
Vol 62 (1) ◽  
pp. 101095
Author(s):  
Masaki Yoshimoto ◽  
Sayuri Kimoto
Keyword(s):  
Creep Behavior ◽  
Constitutive Modeling ◽  
Undrained Creep

Modified Singh-Mitchell Creep Model for EPS Composite Soil

2011 ◽  
Vol 311-313 ◽  
pp. 339-343 ◽  
Author(s):  
Hong Mei Gao ◽  
Guo Xing Chen
Keyword(s):  
Creep Test ◽  
Creep Behavior ◽  
Engineering Properties ◽  
Creep Model ◽  
Deviator Stress ◽  
Fill Material ◽  
Confining Pressures ◽  
Lightweight Fill ◽  
Eps Composite Soil ◽  
Undrained Creep

EPS composite soil is a new kind of lightweight fill material. Its engineering properties have been widely studied. However, the creep behavior has not been well investigated. In this study, triaxial undrained creep test is conducted on EPS composite soil regarding various confining pressures. Based on the testing results, a modified Singh-Mitchell creep model is established for EPS composite soil considering the influence of the deviator stress on the parameter m. Compared with the original Singh-Mitchell model, the modified creep model can well describe the creep behavior of EPS composite soil. It can provide references for engineers to design the project using EPS composite soil.

scholarly journals Effect of Pre-Stretching on Microstructures and Mechanical Behaviors of Creep-Aged 7055 Al Alloy and Its Constitutive Modeling

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 584
Author(s):  
Duquan Zuo ◽  
Zengqiang Cao ◽  
Yuejie Cao ◽  
Guo Zheng
Keyword(s):  
Mechanical Properties ◽  
Constitutive Model ◽  
Creep Strain ◽  
Creep Behavior ◽  
Constitutive Modeling ◽  
Al Alloy ◽  
Mechanical Behaviors ◽  
Optimal Scheme ◽  
Strength Alloy

The rational pre-stretching can contribute to obtaining better mechanical properties. This paper studies the effect of creep stain, mechanical properties, and microstructures of 7055 alloy under different pre-stretching conditions. The results show that compared with solid-quenched alloy, the 7055-T6 alloy is the optimal scheme to attain more creep strain, and the range of pre-stretching from 1.6% to 3.3% is suitable for creep-aged 7055-T6 alloy to obtain better mechanical properties. Further examination by TEM test shows that pre-stretching promotes the formation of dislocations, which provides superior nucleation regions for ή phase resulting in a higher strength alloy. Meanwhile, a unified creep-aging constitutive model for 7055-T6 alloy is established which can be used to accurately predict its creep behavior under the different pre-stretching.

Interpretation of undrained creep tests in terms of effective stresses

1995 ◽  
Vol 32 (2) ◽  
pp. 373-379 ◽  
Author(s):  
Thomas C. Sheahan
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Strain Rate ◽  
Creep Behavior ◽  
Creep Rupture ◽  
Peak Shear Stress ◽  
Stress Levels ◽  
Static Yield ◽  
Undrained Shear ◽  
Undrained Creep

The paper provides an effective stress-based interpretation technique for undrained creep behavior in cohesive soils. This technique could ultimately be used to predict whether a particular applied shear stress level will lead to failure or creep rupture. During the primary phase of undrained creep at constant shear stress, the soil's strain rate decreases, which in turn leads to a decrease in the undrained shear strength. However, it has been shown for a number of soils that a minimum undrained strength, or upper yield strength (suy), is eventually reached regardless of further strain rate decreases. It has been postulated that this phenomenon is part of a time-dependent behavior framework in which the yield locus shrinks with decreasing strain rate until some limiting surface, the static yield surface (SYS), is reached. Such a surface has been the basis for a number of constitutive models in which it represents the inviscid, or rate independent, behavior. The peak shear stress on the SYS corresponds to suy. Data from previous experimental programs are presented to show the existence of the surface and its role in undrained creep behavior. Undrained creep shear stress levels above suy lead to creep rupture on the failure envelope; stress levels below suy cause creep to the SYS, where the stress state apparently stabilizes without failure. The value of suy can be used in a number of analyses in creep susceptible soils, and the static yield condition can be used in the field to determine whether measured pore pressures are exceeding predicted nonrupture levels. A method is proposed for simple determination of the SYS using constant strain rate undrained shear tests. Key words : clays, consolidated-undrained tests, creep, rate effects, rheology, shear strength.

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