Determination of creep properties of frozen soils by means of the borehole stress relaxation test

1993 ◽  
Vol 30 (1) ◽  
pp. 170-186 ◽  
Author(s):  
B. Ladanyi ◽  
M. Melouki
Keyword(s):  
Stress Relaxation ◽  
Strength Properties ◽  
Frozen Soil ◽  
Relaxation Test ◽  
Test Results ◽  
Stress Relaxation Test ◽  
Frozen Soils ◽  
Frozen Sand

The objective of this investigation was to evaluate the potential use of the borehole stress relaxation test to determine the creep and strength properties of frozen soils in situ. The paper presents the results of a series of laboratory pressuremeter relaxation tests performed in frozen sand and compares three possible interpretation methods for deducing from the test results the creep and strength parameters of frozen soils. Key words : borehole relaxation, pressuremeter, in situ testing, creep and strength properties, frozen soil.

Triaxial relaxation testing of a frozen sand

1995 ◽  
Vol 32 (3) ◽  
pp. 496-511 ◽  
Author(s):  
Branko Ladanyi ◽  
M.B. Benyamina
Keyword(s):  
Triaxial Compression ◽  
Strength Properties ◽  
Test Results ◽  
Stress Relaxation Test ◽  
Strength Parameters ◽  
Frozen Soils ◽  
Ottawa Sand ◽  
Frozen Sand ◽  
Laboratory Stress ◽  
Potential Use

The objective of this investigation was to evaluate the potential use of the laboratory stress relaxation test to determine the creep and strength properties of frozen soils. This paper presents the results of a series of laboratory step-loaded relaxation tests performed on frozen Ottawa sand under triaxial compression conditions and compares three different interpretation methods for deducing from the test results the creep and strength parameters of frozen soils. Key words : frozen sand, triaxial test, relaxation, creep parameters.

scholarly journals Effect of Different Jackfruit Puree Concentrations on the Mechanical Properties of Jackfruit Frozen Confection

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Amiruddin Mat Johari ◽  
Nur Aliaa Abd Rahman ◽  
Roseliza Kadir Basha ◽  
Azhari Samsu Baharudin ◽  
Mohd Afandi P. Mohammed ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
Room Temperature ◽  
Relaxation Test ◽  
Compression Stress ◽  
Compression Tests ◽  
Stress Relaxation Test ◽  
Test Device ◽  
Mindstorms Ev3

Jackfruit frozen confection has been mechanically characterised in situ by using compression tests. There are no available studies on the mechanical behaviour of jackfruit frozen confection.   The aim of this study is to identify the mechanical properties of jackfruit frozen confections formulated with different concentrations of jackfruit puree. In this study, the experimental analyses are conducted using a compression test device made from LEGO Mindstorms EV3. The portable device is placed inside a freezer to enable the measurements to be done in low temperatures (-20oC). This is to overcome the limitation of an actual texture analyser which can only be operated at room temperature. The mechanical properties of jackfruit frozen confections at different jackfruit puree concentrations (10%, 20% and 30%) are obtained using the tester and analysed. The tests conducted are uniaxial compression, stress relaxation test and multi-step stress relaxation test. It has been observed that frozen confection with 20% jackfruit puree concentration (JF20) is able to withstand a higher force of compression (27.79kPa) compared to the ones with 10% (JF10) and 30% (JF30) concentrations, at 21.15kPa and 10.48kPa, respectively. For stress relaxation test, JF30 has the highest increasing stress for a strain of 0.05 to 0.2 but it decreases at a strain of 0.3 to 0.4. The results of the multi-step relaxation test on JF30 show agreement with the other two tests where the stress decays starting from the 3rd step until the 5th step of the test. This study provides information on the behaviour of jackfruit frozen confection when subjected to compression and stress that imitates the movement during consumption.

Sharp cone testing of creep properties of frozen sand

1992 ◽  
Vol 29 (5) ◽  
pp. 757-764 ◽  
Author(s):  
B. Ladanyi ◽  
J. Sgaoula
Keyword(s):  
Field Testing ◽  
Frozen Soil ◽  
Theoretical Interpretation ◽  
Creep Properties ◽  
Frozen Sand ◽  
Cone Field ◽  
Sharp Cone ◽  
Constant Axial Load

The paper describes a new field testing method, called the sharp cone test, intended for in situ determination of creep properties of frozen soils and ice. The method consists of pushing a smooth, low-angle, cone into a predrilled conical portion of a borehole. The creep properties of the material are determined by applying a constant axial load on the cone, and by observing its time-dependent axial displacement as it penetrates and enlarges the conical hole. The paper describes the test, gives its theoretical interpretation, and shows the results of a series of tests carried out in a frozen sand. Key words : frozen soil, ice, sharp cone, field testing, creep properties.

In-situ Determination of Undrained Stress-strain Behavior of Sensitive Clays with the Pressuremeter

1972 ◽  
Vol 9 (3) ◽  
pp. 313-319 ◽  
Author(s):  
B. Ladanyi
Keyword(s):  
Direct Determination ◽  
Strain Curve ◽  
Strength Properties ◽  
Test Results ◽  
Stress Strain ◽  
Strain Behavior ◽  
Expansion Curve ◽  
Laboratory Test Results

A theory originally proposed by Gibson and Anderson (1961) has been extended to enable a direct determination of the whole undrained stress-strain curve of the clay from the pressure-expansion curve obtained in a conventional pressuremeter test.When applied to some pressuremeter tests carried out in Leda clay in the Ottawa area, the method enabled us to determine the undrained stress-strain behavior of the clay up to axial strains of about 20%. It is thought that, when properly performed, the test is able to furnish the data on the undrained stress-strain and strength properties of sensitive clays comparable to the laboratory test results obtained on block samples. Its particular feature is that it also furnishes a true picture of the post-peak strength decrease in terms of shear strain which is usually difficult to obtain by any other type of test.

Analysis on the Creep Mechanism of 12Cr-Mo-W-0.25V Steel Based on Long-Term Stress Relaxation Test Data

2016 ◽  
Vol 853 ◽  
pp. 158-162
Author(s):  
Jie Zhao ◽  
Tie Shan Cao ◽  
Cong Qian Cheng ◽  
Hui Fang Li
Keyword(s):  
Stress Relaxation ◽  
Test Data ◽  
Activation Volume ◽  
High Stress ◽  
Relaxation Curve ◽  
Relaxation Test ◽  
Dislocation Slip ◽  
Stress Relaxation Test ◽  
Steel Base

The current paper investigates on the creep behavior of 12Cr-Mo-W-0.25V heat resistant steel base on the long-term stress relaxation test data. It is shows that the stress relaxation curve can be divided into 2 stages: the high stress stage has higher apparent activation volume of 79~350 b3 and the low stress stage is 35~78 b3. Besides, the Helmholtz free energy at the high stress stage is 827~1034 kJ/mol which is higher than 210~252 kJ/mol of the low stress stage. Taking both apparent activation volume and activation energy into account, it is assumed that the high stress stage is mainly controlled by dislocation slip and the low stress stage is more related to diffusion.

Comparison of the Trueness of Fits of the Biphasic Transverse Isotropic and Kelvin Models to the Tensile Behavior of Temporomandibular Joint Disc

2021 ◽  
Vol 143 (6) ◽  
Author(s):  
Wuyang Li ◽  
Sara Trbojevic ◽  
Alejandro J. Almarza
Keyword(s):  
Experimental Data ◽  
Stress Relaxation ◽  
Temporomandibular Joint ◽  
Second Order ◽  
Relaxation Test ◽  
Stress Relaxation Test ◽  
Kelvin Model ◽  
Biphasic Model ◽  
Tmj Disc ◽  
Transverse Isotropic

Abstract This technical brief explores the validity and trueness of fit for using the transverse isotropic biphasic and Kelvin models (first and second order generalized) for characterization of the viscoelastic tensile properties of the temporomandibular joint (TMJ) discs from pigs and goats at a strain rate of 10 mm/min. We performed incremental stress-relaxation tests from 0 to 12% strain, in 4% strain steps on pig TMJ disc samples. In addition, to compare the outcomes of these models between species, we also performed a single-step stress-relaxation test of 10% strain. The transverse isotropic biphasic model yielded reliable fits in reference to the least root mean squared error method only at low strain, while the Kelvin models yielded good fits at both low and high strain, with the second order generalized Kelvin model yielding the best fit. When comparing pig to goat TMJ disc in 10% strain stress-relaxation test, unlike the other two Kelvin models, the transverse isotropic model did not fit well for this larger step. In conclusion, the second order Kelvin model showed the best fits to the experimental data of both species. The transverse isotropic biphasic model did not fit well with the experimental data, although better at low strain, suggesting that the assumption of water flow only applies while uncrimping the collagen fibers. Thus, it is likely that the permeability from the biphasic model is not truly representative, and other biphasic models, such as the poroviscoelastic model, would likely yield more meaningful outputs and should be explored in future works.

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