Creep Property of Reticulate Red Clay under Stepped-Load Creep Tests

2012 ◽  
Vol 446-449 ◽  
pp. 1412-1416
Author(s):  
Jian Zhong Li ◽  
Yan Fu Cao ◽  
Ya Jun Qing
Keyword(s):  
Creep Property ◽  
Creep Tests ◽  
Red Clay ◽  
Reticulate Red Clay

Creep Property of Reticulate Red Clay under Stepped-Load Creep Tests

2012 ◽  
Vol 446-449 ◽  
pp. 1412-1416 ◽  
Author(s):  
Jian Zhong Li ◽  
Yan Fu Cao ◽  
Ya Jun Qing
Keyword(s):  
Creep Deformation ◽  
Empirical Formula ◽  
Creep Property ◽  
Test Results ◽  
Creep Tests ◽  
Red Clay ◽  
Reticulate Red Clay ◽  
Study Test ◽  
Previous Loading

Stepped-load creep tests of undisturbed and remodeled specimens of reticulate red clay was performed in the present study. Test results and analyses of the results show that: (1) Both undisturbed and remodeled specimens showed significant creep deformation in primary loading, unloading and reloading stage, and the creep deformation of remodeled specimen is much bigger than that of undisturbed one in primary loading and reloading stage; (2) The effect of a previous loading stage on the deformation induced at a succeeding stage is significant in primary loading and reloading stage; (3) The amount of the creep deformation can be calculated accurately by an empirical formula.

Simulation on Triaxial Compression Creep Deformation of Reticulate Red Clay

2011 ◽  
Vol 261-263 ◽  
pp. 1414-1418 ◽  
Author(s):  
Jian Zhong Li ◽  
Xi Qing Tang ◽  
Lu Chao Yan
Keyword(s):  
Creep Deformation ◽  
Triaxial Compression ◽  
Lake Area ◽  
Compression Tests ◽  
Creep Tests ◽  
Red Clay ◽  
Creep Stress ◽  
Compression Creep ◽  
Reticulate Red Clay ◽  
Laboratory Test Results

Triaxial compression creep tests were performed on the undisturbed specimens of reticulate red clay from Dongting Lake area (China) under different confined stress. By analyzing the laboratory test results, following conclusions were drawn: (1) creep deformation occurred in all compression tests; (2) creep deformation increases as the increasing of the creep stress (compress stress) slightly; (3) the creep deformation occurred in the triaxial compression creep tests can be well simulated with Singh-Mitchell model.

Creep Property of Boron Added 9Cr Heat Resistant Steels after Welding

2018 ◽  
Vol 941 ◽  
pp. 340-345
Author(s):  
Tetsuya Matsunaga ◽  
Maaouia Souissi ◽  
Ryoji Sahara ◽  
Hiromichi Hongo ◽  
Masaaki Tabuchi ◽  
...  
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Rapid Heating ◽  
Boundary Migration ◽  
Creep Property ◽  
Creep Tests ◽  
Precipitate Morphology ◽  
Premature Failure ◽  
Heat Resistant ◽  
Type Iv

Although welding results in premature failure by type IV fracture under high temperature creep conditions, the alloy design of light elements such as boron addition and nitrogen reduction enhances the creep lifetime of 9Cr heat resistant steel. In particular, the simulated heat affected zone (SHAZ) sample of new 9Cr steel (called TA steel) shows about 10 times longer creep lifetime than that of the standard Gr. 91 steel. The welded TA steel is thus expected to exhibit good creep properties because its SHAZ sample has coarser grains and suppresses type IV fracture. The preservation of base metal’s microstructure after welding results from the precipitate morphology, such as high grain boundary coverage by precipitates and low amount of MX being nucleation sites of ferrite grains during the a-g phase transformation. In addition, the increase of stability of M23C6 affects high pinning pressure toward grain boundary migration upon rapid heating during welding. First-principles calculations confirm the increased stability when boron is absorbed by M23C6. Moreover, the calculations reveals that boron decreases the coherency between matrix and M23C6, suppressing grain coarsening during creep tests in TA steel. It is concluded that the increased microstructural stability during welding and long high temperature exposure generates the elongated creep lifetime in welded TA steel including about 0.01 wt% boron and less than 0.01 wt% nitrogen.

Experimental Study on Creep Property of Similar Material for Jin Tan Salt Rock Gas Storage Medium

2012 ◽  
Vol 170-173 ◽  
pp. 772-776
Author(s):  
Kang Duan ◽  
Qiang Yong Zhang ◽  
Bing Cai ◽  
Xiao Bin Xu
Keyword(s):  
Uniaxial Compression ◽  
Rock Salt ◽  
Creep Property ◽  
Gas Storage ◽  
Salt Rock ◽  
Similar Material ◽  
Creep Tests ◽  
Deformation And Failure ◽  
Original Rock ◽  
Stress Dependent

Uniaxial compression creep tests have been performed on a kind of rock salt similar material and laminated salt rock similar material on the base of salt rock gas-storage in Jintan. The creep tests show that the rheological property of the similar material is basically the same with the original rock. Under the uniaxial compression, the deformation gradually approaches to be constant after the early short stage of creep attenuation. The similar material shows stress-dependent behavior obviously under different stress stage, the greater the load the higher the creep ratio and creep deformation. A creep constitutive equation which is suitable to rock salt is used to the similar material, and it fits with the obtained creep data very well. The results show that the similar material developed in this passage has the same creep property as the original salt rock,and this material can be used to simulated the deformation and failure of underground gas storage constructed in bedded salt deposits.

An Empirical Constitutive Correlation for Regular Jugged Discontinuity of Rock Surfaces

2013 ◽  
Vol 5 (2) ◽  
pp. 258-268 ◽  
Author(s):  
Bin Yang ◽  
Sihao Mo ◽  
Ping Wu ◽  
Chaoqing He
Keyword(s):  
Deformation Property ◽  
Creep Property ◽  
Shear Stresses ◽  
Test Results ◽  
Creep Tests ◽  
Shear Creep ◽  
Burger Model ◽  
Structural Plane ◽  
Creep Velocity

AbstractThis paper presents a physical investigation and mathematical analysis on mechanical behavior of the regular jugged discontinuity. In particular, we focus on the creep property of structural plane with various slope angles under different normal stress through shear creep tests of structural plane under shear stresses. According to the test results, the shear creep property of structural plane was described and the creep velocity and long-term strength of the structural plane during shear creep were also investigated. An empirical formula is finally established to evaluate shear strength of discontinuity and a modified Burger model was proposed to represent the shear deformation property during creep.

Behavior of Cemented Reticulate Red Clay

2012 ◽  
Vol 446-449 ◽  
pp. 1666-1669 ◽  
Author(s):  
Jian Zhong Li ◽  
Li Chun Zhuo ◽  
Xi Ni
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Cement Content ◽  
Axial Strain ◽  
Test Results ◽  
Compression Tests ◽  
Red Clay ◽  
Reticulate Red Clay ◽  
Strain Deviator ◽  
Relationship Of

Mechanical properties of cemented reticulate red clay were studied in present research. Test results show that: (1) shear strength of cemented reticulate red clay increase exponentially as the increasing of cement content; (2) shear strength of cemented reticulate red clay decrease polynomially as the increasing of water content; (3) mechanical properties of cemented reticulate red clay affected significantly by curing time and curing confined pressure. In order to study viscous properties of cemented reticulate red clay, cemented reticulate red clay specimens were compressed in triaxial chamber at different shear rate. Results of the compression tests show that it is obvious that the axial strain-deviator stress relationship of cemented reticulate red clay affects by the strain rate.

scholarly journals Structure analysis and enhancement of creep resistance and thermal properties of eutectic Sn-Ag lead free solder alloy by Ti and Cd - addition

2017 ◽  
pp. 5092-5099
Author(s):  
Amal Mohamed Yassin ◽  
Berlent Abd El Hamed Khalifa ◽  
Reda Afify Ismail
Keyword(s):  
Thermal Properties ◽  
Solder Alloy ◽  
Creep Property ◽  
Axial Ratio ◽  
Tensile Creep ◽  
Creep Tests ◽  
X Ray ◽  
Temperature Range ◽  
Morphological Studies ◽  
Residual Strains

Eutectic (Sn-3.5wt.%Ag) solder alloy is used in electronic circuits in which the creep property of the solder joints is essential for their applications. The study of creep, structure and thermal properties of three solder alloys (Sn-3.5wt.%Ag,Sn-3.5wt.%Ag-0.27wt.%Ti and Sn-3.5wt.Ag-0.27wt.%Cd) is characterized by the presence of (Ag3Sn-IMC) beside the phase (β-Sn). The microstructure parameters obtained from the X-ray analysis represented by, lattice parameters (a, c), the axial ratio (c/a), the residual strains (Δa/a0, Δc/c0) and peak height intensities (hkl) of some crystallographic planes are given. All parameters were found to be sensitive to the additions of (Ti or Cd), applied stresses and working temperatures in the range (298-373K).The crystallite size of the (211) reflection was found to increase from (61-132nm) with the additions and to decrease from (115-79nm) with the working temperatures. The morphological studies show a remarkable decrease in the size of (β-Sn) grains with the addition of (Cd) content which confirms the X-ray data. The obtained results show a decrease in melting temperature with the additions. The creep properties are notably improved by the addition of either (Ti) or (Cd). In order to reveal the creep characteristics such as stress exponent (n) and activation energy (Q), the tensile creep tests were performed within the temperature range (298-373K) at constant applied stress (17.27MPa). Based on the obtained stress exponents and activation energies, it is explained that the dominant deformation mechanism is dislocation climb over all temperature range.  

Sign in / Sign up

Export Citation Format

Share Document