Weighted residual approach to constant strain rate test

2011 ◽  
Vol 48 (4) ◽  
pp. 671-675 ◽  
Author(s):  
Dieter Stolle ◽  
Jonathan Stolle
Keyword(s):  
Strain Rate ◽  
Pore Pressure ◽  
Constant Strain Rate ◽  
Time Factors ◽  
Transient Effects ◽  
Coefficient Of Consolidation ◽  
Virtual Displacement ◽  
Constant Rate ◽  
Rate Test ◽  
Displacement Approach

This note presents a virtual displacement approach to analyze the constant rate of strain consolidation test. It yields simplified “exact” equations within the weighted residual context for interpreting test data. Equations corresponding to larger time factors are similar to those presented in the literature, although the transient effects are clearer than in previous formulations. An advantage of the framework is that assumptions concerning the uniformity of properties through a sample can be relaxed. The derivation shows that E must be constant for the coefficient of consolidation to be independent of position. Depending on the sequencing of sublayers, it is shown that basal pore pressure can be higher or lower for layered media compared with uniform material when allowing E to vary, even though cv is kept constant.

In situ estimation of the coefficient of consolidation in clays

1990 ◽  
Vol 27 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Mohammed G. Kabir ◽  
Alan J. Lutenegger
Keyword(s):  
Key Words ◽  
Pore Pressure ◽  
Reference Values ◽  
Time Factors ◽  
In Situ Tests ◽  
Coefficient Of Consolidation ◽  
Oedometer Test ◽  
Undisturbed Samples ◽  
Oedometer Tests

An investigation was conducted to demonstrate the applicability of cylindrical piezocone and flat piezoblade tests for providing reliable estimates of the coefficient of consolidation in clays. Coefficients of consolidation were calculated from piezocone dissipation tests for different degrees of consolidation using theoretical time factors to provide a comparison with laboratory oedometer tests. Three techniques were developed to calculate the coefficient of consolidation from piezoblade dissipation tests. Results from in situ pore pressure dissipation tests were compared with laboratory oedometer tests performed on undisturbed samples oriented in both the vertical and horizontal directions, to provide reference values of cv and ch. The results of investigations conducted at several clay sites are presented. Key words: in situ tests, piezocone, piezoblade, coefficient of consolidation, oedometer test, clays.

A numerical and experimental investigation of AZ31 formability at elevated temperatures using a constant strain rate test

2010 ◽  
Vol 31 (3) ◽  
pp. 1308-1316 ◽  
Author(s):  
G. Palumbo ◽  
D. Sorgente ◽  
L. Tricarico
Keyword(s):  
Experimental Investigation ◽  
Strain Rate ◽  
Elevated Temperatures ◽  
Constant Strain Rate ◽  
Rate Test

Effect of Severe Caliber Rolling on Superplastic Properties of Mg-3Al-1Zn (AZ31) Alloy

2012 ◽  
Vol 735 ◽  
pp. 327-331 ◽  
Author(s):  
Rajendra Doiphode ◽  
Rahul Ramesh Kulkarni ◽  
S.V.S. Narayana Murty ◽  
Nityanand Prabhu ◽  
Bhagwati Prasad Kashyap
Keyword(s):  
Strain Rate ◽  
Constant Strain Rate ◽  
Material Constant ◽  
Az31 Alloy ◽  
Strain Rate Range ◽  
Constitutive Relationship ◽  
Grain Sizes ◽  
Different Temperatures ◽  
Rate Test ◽  
Superplastic Properties

Fine grains were developed in Mg-3Al-1Zn (AZ31) alloy by isothermal caliber rolling at five different temperatures in the range of 250-450°C. The samples of different grain sizes were deformed by constant strain rate and differential strain rate test techniques over the temperature range of 220-450 °C and strain rate range of 10-5 to 10-1 s-1. The effects of grain size, test temperature and strain rate on flow stSuperscSuperscript textript textress were analysed to develop the constitutive relationship for supSuperscript texterplastic deformation. The parameters of the constitutive relationship obtained from the constant strain rate tests and differential strain rate tests were used to find out the material constant A of the constitutive relationship.

Effect of Changing Strain Rate during Warm Deformation on Static Recrystallisation of IF Steel

2007 ◽  
Vol 550 ◽  
pp. 3-12
Author(s):  
C. Prentice ◽  
C.M. Sellars
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Subgrain Size ◽  
Constant Strain Rate ◽  
Salt Bath ◽  
Interstitial Free ◽  
Compression Tests ◽  
Constant Rate ◽  
Interstitial Free Steel ◽  
Kinetics Of

Plane strain compression tests have been carried out on Ti stabilised interstitial free steel at 700oC with constant and changing strain rates. Specimens were annealed in a salt bath at 750oC to determine the effects of changing strain rate on the kinetics of static recrystallisation and on the recrystallised grain size. After relatively slow changes in rate, the recrystallisation behaviour at the end of the change was the same as for tests at constant strain rate with the final value. For faster changes in rate, there were transients in recrystallisation rate and recrystallised grain size at the end of the change in strain rate at a strain of 1.0. These were removed by a further increment of 0.1 strain at constant rate. In all cases the recrystallised grain size correlated with the subgrain size present at the end of deformation.

scholarly journals A Study on the Consolidation Characteristics Using the Constant Strain Rate Test of Remolded Gwangyang Marine Clay

2014 ◽  
Vol 13 (4) ◽  
pp. 33-43
Author(s):  
Joeng-Min Jang ◽  
Jin-Young Kim ◽  
Woon-Ki Joeng ◽  
Jin Choi ◽  
Young-Sik Jin ◽  
...  
Keyword(s):  
Strain Rate ◽  
Constant Strain Rate ◽  
Marine Clay ◽  
Rate Test

New method to determine proper strain rate for constant rate-of-strain consolidation tests

2012 ◽  
Vol 49 (1) ◽  
pp. 18-26 ◽  
Author(s):  
A. Tolga Ozer ◽  
Evert C. Lawton ◽  
Steven F. Bartlett
Keyword(s):  
Strain Rate ◽  
Linear Equation ◽  
Pore Pressure ◽  
Void Ratio ◽  
Semiempirical Method ◽  
The Other ◽  
Initial Void Ratio ◽  
Constant Rate ◽  
Loading Tests ◽  
Incremental Loading

The development of a new semiempirical method to predict the proper strain rate for constant rate-of-strain (CRS) consolidation tests is described herein. The validity of the proposed method is analyzed using experimental results from CRS and incremental loading tests on four types of soil: Lake Bonneville clay, Massena clay, kaolinite, and montmorillonite. It is found that the maximum allowable strain rate depends on the initial void ratio of the soil and thus is related to the compressibility of the soil. The effect of the strain rate on the distribution of the pore pressure within the sample is investigated by comparing values of effective vertical stress calculated using a linear equation published by Wissa et al. in 1971 with values of effective stress at the base of the specimen determined from measured values of pore pressure. Overall, the proposed method predicts the maximum allowable strain rate very well for three of the four soils and moderately well for the other soil.

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