Influence of Initial Stress and Deformation States on the Shear Creep Behavior of Rock Discontinuities with Different Joint Roughness Coefficients

The static shear creep behavior of asphalt mastic containing recycled red brick powder (RBP) is investigated in this paper. The used mastic consists of asphalt and filler at a mass ratio of 1:1. Dynamic Shear Rheometer (DSR) performed the static shear creep tests at 0°C. The static shear creep behavior of RBP asphalt mastic was analyzed and modeled based on Burgers model. It is concluded that the introduction of RBP results in smaller deformation, higher static shear creep stiffness modulus of asphalt mastic at 0°C. It was also indicated that Burgers model can well explain the static shear creep behavior of RBP asphalt mastic.

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Creep Behavior of PB-Free Solders

10.1115/imece2001/epp-24728 ◽

2001 ◽

Author(s):

F. Hua ◽

C. M. Garner ◽

H. G. Song ◽

J. W. Morris

Keyword(s):

Activation Energy ◽

Creep Behavior ◽

Solder Joints ◽

Creep Process ◽

Diffusion Activation Energy ◽

Air Cooling ◽

Shear Creep ◽

Self Diffusion ◽

Intermetallic Particles ◽

Stress Levels

Abstract This study reports results of shear creep behavior of four Pb-free solders, Sn-3Ag-0.5Cu, Sn-3.5Ag, Sn-0.7Cu and Sn-10In-3.1Ag at 95θC and 130θC. At the stress levels tested, all the four solders showed the stress components close or larger than 5, typical for matrix creep. The calculated activation energies for Sn-0.7Cu, Sn-3.5Ag and Sn-3Ag-0.5Cu are from 103kJ/mol to 117kJ/mol, which are very close to the pure Sn self-diffusion activation energy (107kJ/mol). It suggested that the creep process is controlled by Sn bulk self-diffusion rate. The creep activation energy for Sn-10In-3.1Ag is higher in the range of 173–193kJ/mol. The Sn-0.7Cu, Sn-3Ag-0.5Cu and Sn-10In-3.1Ag solder joints were also prepared with two different cooling rates, 3.5θC/min. (furnace-cooling) and 2.7θC/S (air-cooling) and tested at 130θC. It was observed that faster cooled solder joints have faster creep strain rates than slower cooled solder joints at the stress levels tested for all three solders, due to the fine and even distribution of intermetallic particles.

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Prediction and calculation of the shear creep behavior of amorphous polymers under progressive physical aging

Advances in Engineering Fluid Mechanics: Multiphase Reactor and Polymerization System Hydrodynamics ◽

10.1016/b978-088415497-6/50028-0 ◽

1996 ◽

pp. 683-709

Author(s):

R.O.E. Greiner ◽

J. Kaschta

Keyword(s):

Creep Behavior ◽

Physical Aging ◽

Amorphous Polymers ◽

Shear Creep

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Research on Creep Property of Cement Grouted Joint

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.2819 ◽

2011 ◽

Vol 243-249 ◽

pp. 2819-2824

Author(s):

Fu Ting Sun ◽

Cheng Xue She ◽

Kun Li

Keyword(s):

Normal Stress ◽

Creep Test ◽

Creep Property ◽

Test Results ◽

Shear Creep ◽

Joint Roughness ◽

Multi Stage ◽

Elastic Shear ◽

Theoretical Results ◽

Good Coincidence

The creep property of cement grouted joint is studied based on creep test and theoretical analysis. Firstly, the multi-stage shear creep test under constant normal stress, joint roughness and cement filled thickness is carried out to obtain the creep deformation. Then the conventional linear Nishihara model is used to fit the test results. Due to the big deviation of the theoretical results from the test, the instantaneous elastic shear stiffnesses under different loading stages are calculated. It is found that they vary with the shear stress. The reasons for the nonlinearity are analyzed. Finally the parameters of the Nishihara model are modified to be nonlinear and fit with the test results showing good coincidence between them. These researches release the creep property of the cement grouted joint, and will provide a good basis for further research considering more influencing factors such as normal stress, joint roughness and cement filled thickness.

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