THE PORE PRESSURE – STRAIN RELATIONSHIP OF NORMALLY CONSOLIDATED UNDISTURBED CLAYS: PART I. THEORETICAL CONSIDERATIONS

1969 ◽  
Vol 6 (4) ◽  
pp. 383-394 ◽  
Author(s):  
K. Y. Lo
Keyword(s):  
Pore Pressure ◽  
Critical Review ◽  
Principal Strain ◽  
Pore Pressures ◽  
Strain Relationship ◽  
Set Up ◽  
Relationship Of ◽  
Theoretical Considerations

This paper presents a critical review of the current theories of predicting pore pressures in saturated clays. These theories are generalized and examined and their limitations discussed. It is shown mathematically that the pore pressure induced by shear may be expressed as a sole function of major principal strain, and this approach eliminates the anomalies inherent in the "stress theories" for pore pressure. A hypothesis is also developed to provide a possible mechanism of pore pressure set up in undisturbed normally-consolidated clays.

THE PORE PRESSURE – STRAIN RELATIONSHIP OF NORMALLY CONSOLIDATED UNDISTURBED CLAYS: PART II. EXPERIMENTAL INVESTIGATION AND PRACTICAL APPLICATIONS

1969 ◽  
Vol 6 (4) ◽  
pp. 395-412 ◽  
Author(s):  
K. Y. Lo
Keyword(s):  
Pore Pressure ◽  
Plane Strain ◽  
Pressure Ratio ◽  
Triaxial Tests ◽  
Axially Symmetric ◽  
Practical Applications ◽  
Strain Relationship ◽  
Intrinsic Anisotropy ◽  
Set Up ◽  
Relationship Of

Experimental results on normally-consolidated undisturbed clays of various sensitivities are presented and analyzed using the approach developed in Part I. It is shown that, both for isotropically and anisotropically consolidated samples, the pore pressure ratio – strain relationship is independent of the magnitude of consolidation pressures, time of sustained stress, time of consolidation and intrinsic anisotropy under both plane strain and axially-symmetric stress conditions. The effect of the intermediate principal stress may be taken easily into account so that the pore pressure set up under plane strain condition may be estimated from results of laboratory triaxial tests. The effect of strain rate was found to be small for the clays tested, and becomes insignificant at large strains.The relevance of each of these conclusions in relation to practical problems are discussed. The use of the pore pressure – strain approach in practice in general, and for some class of field problems in which the approach is especially suited, are pointed out.

Experimental Study for Wave-Induced Oscillatory Pore Pressures in a Sandy Seabed

2014 ◽  
Author(s):  
Bo Liu ◽  
Dong-Sheng Jeng ◽  
Guanlin Ye
Keyword(s):  
Experimental Study ◽  
Pore Pressure ◽  
Vertical Cylinder ◽  
Soil Conditions ◽  
Soil Parameters ◽  
Pore Pressures ◽  
Sandy Deposit ◽  
Dimensional Facility ◽  
Set Up ◽  
Wave Induced

In this paper, an experimental study for wave-induced pore pressures in marine sediments was reported. In the experiment, a one-dimensional facility was set up with a vertical cylinder and a 1.8 m thick sandy deposit and 0.2 m thick water above the deposit. Unlike the previous experiments [1], additional static water pressures were added on the harmonic dynamic wave pressure and more pore pressure gauges were buried in the deposit, which allowed us to simulate the case with larger water depth and better describe the distribution of pore pressure trend. A series of experiments with 3000 cycles in each test were conducted under numerous different wave and soil conditions, which allowed us to examine the influence of wave and soil parameters on the wave-induced pore pressures as well as liquefaction. The experimental results show the significant influence of liquefaction on sandy seabed in shallow water. Furthermore, some new experimental phenomenon was observed. The depth of sandy deposit was usually considered to be unchanged in theoretical calculation, while the depth of which was indeed changed periodic with wave loading, which was observed and recorded in the experiments.

Modelling of Elastic-Plastic Bending of Beams Using a Roller Bending Machine

1979 ◽  
Vol 101 (3) ◽  
pp. 304-310 ◽  
Author(s):  
N. E. Hansen ◽  
O. Jannerup
Keyword(s):  
Curvature Function ◽  
Stress Strain ◽  
Plastic Bending ◽  
Moment Distribution ◽  
Strain Relationship ◽  
Actual Material ◽  
Set Up ◽  
Relationship Of ◽  
Bending Of Beams ◽  
Good Agreement

A model for bending steelbeams with rectangular crossection on a three-roller bending machine has been set up. The main effort has been paid to the geometry of the process. The basis for the model is an assumed triangular moment distribution between the rollers, and, considering the stress-strain relationship of the actual material (cold-drawn steel), the calculations based on the model lead to a curvature function which differs much from the often assumed function: the circle. The calculated curvature functions have been compared to experimentally obtained functions, and good agreement has been found.

scholarly journals Dynamic Mechanical Properties and Constitutive Model of Honeycomb Materials with Random Defects under Impact Loading

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Hu Jun ◽  
Ren Jianwei ◽  
Ma Wei ◽  
Wang Aiguo
Keyword(s):  
Constitutive Model ◽  
Impact Loading ◽  
Material Design ◽  
Dynamic Mechanical Properties ◽  
Plateau Stress ◽  
Strain Relationship ◽  
Set Up ◽  
Relationship Of ◽  
Impact Experiments ◽  
Random Defects

The study analyzed the influence of random defects on plateau stresses of honeycomb materials with varied relative densities and established a computational model of honeycomb materials considering random defects. The results show that the plateau stress decreases evidently as the random defects increase, which is closely related to the relative density of honeycomb materials. It also set up a functional relationship between relative plateau stresses and random defects as well as that between relative plateau stresses and relative densities. Taken topological structure, random defects and strain rate effect into consideration, and it proposed a dynamic constitutive model of honeycomb materials under low-middle impact loading. And the proposed constitutive model possesses a better applicability to match the stress-strain relationship of honeycomb materials in existing impact experiments. The proposed constitutive model could make a theoretical foundation in material design and practical application of honeycombs containing random defects.

Study of Post-Peak Stress-Strain Relationship of Rock Mass with Joint

2014 ◽  
Vol 638-640 ◽  
pp. 561-564
Author(s):  
Lei Wang ◽  
Hai Yuan Wang ◽  
Liang Yan Jiang
Keyword(s):  
Piecewise Linear ◽  
Peak Stress ◽  
Strength Criterion ◽  
Linear Functions ◽  
Principal Strain ◽  
Rock Masses ◽  
Stress Strain ◽  
Maximum Principal Strain ◽  
Strain Relationship ◽  
Relationship Of

The post-peak stress strain relationship expression of intact rock cannot well reflect post peak properties of rock masses with joint, in order to obtain post peak stress-strain relationship suitable for rock masses with joint, based on the test data, based on the Kulun strength criterion, analysis evolution of post peak strength parameters of rock masses with joint. According to rock masses with joint under different confining pressure and fracture dip at different post peak behavior, the post peak stress-strain relationship is simplified as new kind type, regarding maximum principal strain as strain softening parameter, on the assumption cohesion and internal friction angle are the piecewise linear functions of maximum principal strain, the method of solving express of new post-peak stress-strain relationship of rock masses with joint is obtained.

A Study on the Relationship Between Psychological Climate, Employee Engagement and Organizational Citizenship Behavior

2015 ◽  
Vol 6 (2) ◽  
Author(s):  
Ginu George ◽  
Binoy Joseph
Keyword(s):  
Employee Engagement ◽  
Organizational Citizenship ◽  
Organizational Citizenship Behavior ◽  
Academic Research ◽  
Psychological Climate ◽  
Citizenship Behavior ◽  
Set Up ◽  
Relationship Of ◽  
The Relationship

Employee engagement is becoming an important area of focus by many HR consultancies in the recent years. Organizations having engaged employees tend to out-perform than employees who are not engaged or disengaged, also it will enable them to compete better in their industry resulting in higher performance, lower turnover, more profitability etc., Despite of all this there are still some industries who are ignorant and neglect the importance of having engaged employees. Therefore there is a necessity for more of academic research on employee engagement which helps in creating awareness to these organizations about the prominence of focusing on employee engagement and the findings will also augments the existing literature on employee engagement. The study was conducted on 433 employees working in travel organizations set up in Bangalore with the purpose of determining the relationship psychological climate (antecedent) has on employee engagement and in turn its relationship with organizational citizenship behavior (outcome). The study also determines the mediating relationship of employee engagement between PC and OCB.

Semi-inverse method for predicting stress–strain relationship from cone indentations

2003 ◽  
Vol 18 (9) ◽  
pp. 2068-2078 ◽  
Author(s):  
A. DiCarlo ◽  
H. T. Y. Yang ◽  
S. Chandrasekar
Keyword(s):  
A Priori ◽  
Model Material ◽  
Material Behavior ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Indentation Tests ◽  
Strain Relationship ◽  
Initial Force ◽  
Relationship Of ◽  
Force Displacement

A method for determining the stress–strain relationship of a material from hardness values H obtained from cone indentation tests with various apical angles is presented. The materials studied were assumed to exhibit power-law hardening. As a result, the properties of importance are the Young's modulus E, yield strength Y, and the work-hardening exponent n. Previous work [W.C. Oliver and G.M. Pharr, J. Mater. Res. 7, 1564 (1992)] showed that E can be determined from initial force–displacement data collected while unloading the indenter from the material. Consequently, the properties that need to be determined are Y and n. Dimensional analysis was used to generalize H/E so that it was a function of Y/E and n [Y-T. Cheng and C-M. Cheng, J. Appl. Phys. 84, 1284 (1999); Philos. Mag. Lett. 77, 39 (1998)]. A parametric study of Y/E and n was conducted using the finite element method to model material behavior. Regression analysis was used to correlate the H/E findings from the simulations to Y/E and n. With the a priori knowledge of E, this correlation was used to estimate Y and n.

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