Energy-based analysis of permanent strain behaviour of cohesive soil under cyclic loading

2017 ◽  
Vol 65 (2) ◽  
pp. 331-344 ◽  
Author(s):  
Wojciech Sas ◽  
Andrzej Głuchowski ◽  
Bartłomiej Bursa ◽  
Alojzy Szymański
Keyword(s):  
Cyclic Loading ◽  
Cohesive Soil ◽  
Permanent Strain ◽  
Strain Behaviour

scholarly journals Repeated Loading of Cohesive Soil – Shakedown Theory in Undrained Conditions

2015 ◽  
Vol 37 (2) ◽  
pp. 11-16 ◽  
Author(s):  
Andrzej Głuchowski ◽  
Alojzy Szymański ◽  
Wojciech Sas
Keyword(s):  
Cyclic Loading ◽  
Soil Mechanics ◽  
Cohesive Soil ◽  
Small Strain ◽  
Repeated Loading ◽  
New Production ◽  
Permanent Strain ◽  
Shakedown Theory ◽  
Resilient Response ◽  
Cyclic Loading Tests

Abstract The development of industry and application of new production techniques could bring about extraordinary problems that have been neglected. One of these challenges in terms of soil mechanics is high frequency cyclic loading. Well constructed foundation may reduce this troublesome phenomenon but excluding it is usually uneconomic. In this paper, shakedown theory assumptions were studied. Cyclically loaded soils behave in various ways depending on the applied stress rate. Common cohesive soils in Poland, i.e., sandy-silty clays are problematic and understanding of their behaviour in various conditions is desired. In order to study repeated loading of this material, cyclic triaxial test were carried out. Cyclic loading tests were conducted also in one way compression. These methods in small strain regime allow permanent strain increment analysis with resilient response after numerous cycles. This behaviour was subsequently exploited in the study of shakedown theory. This paper contains some conclusions concerning the above-mentioned theory.

scholarly journals Influence of the microstructure on the cyclic stress-strain behaviour and fatigue life in hypo-eutectic Al-Si-Mg cast alloys

2018 ◽  
Vol 165 ◽  
pp. 15004 ◽  
Author(s):  
Jochen Tenkamp ◽  
Alexander Koch ◽  
Stephan Knorre ◽  
Ulrich Krupp ◽  
Wilhelm Michels ◽  
...  
Keyword(s):  
Solid Solution ◽  
Fatigue Life ◽  
Cyclic Loading ◽  
Weight Ratio ◽  
Cyclic Stress ◽  
Stress Strain ◽  
Strain Behaviour ◽  
Eutectic Morphology ◽  
Cast Alloys ◽  
Incremental Step

Aluminium alloys are promising candidates for energy-and cost-efficient components in automotive and aerospace industries, due to their excellent strength-to-weight ratio and relatively low cost compared to titanium alloys. As modern cast processing and post-processing, e.g. hot isostatic pressing, result in decreased frequency and size of defects, the weakest link depends on microstructural characteristics, e.g. secondary dendrite arm spacing (SDAS), Si eutectic morphology and α-Al solid solution hardness. Hereby, fatigue investigations of the effect of the microstructure characteristics on the cyclic stress-strain behaviour as well as fatigue mechanisms in the low cycle and high cycle fatigue regime are performed. For this purpose, samples of the aluminium cast alloy EN AC-AlSi7Mg0.3 with different Si eutectic morphology and α-Al solid solution hardness were investigated. To compare the monotonic and cyclic stress-strain curves, quasistatic tensile tests and incremental step tests were performed on two microstructure conditions. The results show that the cyclic loading leads to a hardening of the material compared to monotonic loading. Based on damage parameter Woehler curves, it is possible to predict the damage progression and fatigue life for monotonic and cyclic loading in hypo-eutectic Al-Si-Mg cast alloys by one power law.

scholarly journals Undrained Pore Pressure Development on Cohesive Soil in Triaxial Cyclic Loading

2019 ◽  
Vol 9 (18) ◽  
pp. 3821 ◽  
Author(s):  
Andrzej Głuchowski ◽  
Emil Soból ◽  
Alojzy Szymański ◽  
Wojciech Sas
Keyword(s):  
Stress State ◽  
Cyclic Loading ◽  
Pore Pressure ◽  
Cohesive Soil ◽  
Soil Samples ◽  
Test Results ◽  
Soil Behavior ◽  
Pressure Development ◽  
Undrained Conditions ◽  
Excess Pore

Cohesive soils subjected to cyclic loading in undrained conditions respond with pore pressure generation and plastic strain accumulation. The article focus on the pore pressure development of soils tested in isotropic and anisotropic consolidation conditions. Due to the consolidation differences, soil response to cyclic loading is also different. Analysis of the cyclic triaxial test results in terms of pore pressure development produces some indication of the relevant mechanisms at the particulate level. Test results show that the greater susceptibility to accumulate the plastic strain of cohesive soil during cyclic loading is connected with the pore pressure generation pattern. The value of excess pore pressure required to soil sample failure differs as a consequence of different consolidation pressure and anisotropic stress state. Effective stresses and pore pressures are the main factors that govern the soil behavior in undrained conditions. Therefore, the pore pressure generated in the first few cycles plays a key role in the accumulation of plastic strains and constitutes the major amount of excess pore water pressure. Soil samples consolidated in the anisotropic and isotropic stress state behave differently responding differently to cyclic loading. This difference may impact on test results analysis and hence may change the view on soil behavior. The results of tests on isotropically and anisotropically consolidated soil samples are discussed in this paper in order to point out the main features of the cohesive soil behavior.

Evaluation of Durability and Permanent Deformation of Modified Road Base Construction Using Rovene® 4045 and Portland Cement Additives

2015 ◽  
Vol 1089 ◽  
pp. 228-234
Author(s):  
Mojtaba Shojaei Baghini ◽  
Amiruddin Ismail ◽  
Mohamad Rehan bin Karim
Keyword(s):  
Portland Cement ◽  
Permanent Deformation ◽  
Engineering Properties ◽  
Weight Changes ◽  
Permanent Strain ◽  
Road Base ◽  
Strain Behaviour ◽  
Wheel Tracking ◽  
Styrene Butadiene

Due to lack of previous study on applying polymer additives in road base construction, this research presents experimental results on the improvement of long-term road base performance by the addition of carboxylated styrene–butadiene emulsion (Rovene® 4045) and Portland cement. The specimens stabilized with Portland cement (0–6%) and Rovene® 4045 (5–10%) and then subjected to different stress sequences to study the wetting and drying (WD) and wheel tracking (WT) tests on the 7-day-cured specimens. Results of tests conducted to assess the specimens’ resistance to WD cycling showed that the addition of a 4% Portland cement–7% Rovene® 4045 mixture resulted in reductions of 86.99% in water absorption, volume changes of 88.55%, and weight changes of 92.84% relative to a sample with only 4% cement after 12 WD cycles. The permanent strain behaviour of the samples was assessed by the WT test. The results of WT test showed that the permanent deformation characteristics of the mixture were considerably improved by utilization of Rovene® 4045 modification, which resulted in reductions of 218.9% at 25 oC, and 356.8% at 50 oC in permanent strain of the mixture respectively. Therefore, this research nominates a new polymer additive having outstanding engineering properties and environmental friendly.

Beyond Shakedown-Ratcheting Boundary

2018 ◽  
Author(s):  
R. Adibi-Asl ◽  
W. Reinhardt
Keyword(s):  
Cyclic Loading ◽  
Plastic Strain ◽  
Fatigue Damage ◽  
Thermal Load ◽  
Pressure Vessels ◽  
Growth Strain ◽  
Strain Condition ◽  
Element Analysis ◽  
Permanent Strain ◽  
Section Viii

The ASME Boiler and Pressure Vessel Code (Section III and Section VIII) provides requirements to avoid a ratcheting (accumulating permanent strain) condition under cyclic thermal load application. The ratchet check in this code is based on the solutions presented by Miller in 1959. One important focus in Miller’s work was to estimate the accumulated plastic strain under cyclic loading. The existing pressure vessels and piping codes have been adopting Miller’s ratchet boundary solution where there is no cyclic plastic accumulation of strain. However, some of these codes also provide limit on accumulated plastic strain under ratcheting conditions. Since the cyclic loading also causes fatigue damage in thee component, the question how to account for the interaction of ratchet deformation, which may contribute to damage in the material, and fatigue damage arises, since the fatigue curves are obtained from tests in the absence of ratcheting. This paper investigates the solutions to calculate growth strain (incremental plastic strain) and their application in design including taking into account the interaction with fatigue. Finite element analysis is presented to validate the analytical solutions.

Strain behaviour of sapric peat under long-term cyclic loading

2018 ◽  
Vol 171 (5) ◽  
pp. 405-421 ◽  
Author(s):  
Yu-Feng Gao ◽  
Wei Xiao ◽  
Gui-Zhong Xu ◽  
Yue Gui
Keyword(s):  
Cyclic Loading ◽  
Strain Behaviour

Model for Resilient Modulus and Permanent Strain of Subgrade Soils

1998 ◽  
Vol 1619 (1) ◽  
pp. 85-93 ◽  
Author(s):  
A.S. Muhanna ◽  
M.S. Rahman ◽  
P.C. Lambe
Keyword(s):  
Simple Model ◽  
Plastic Strain ◽  
Confidence Intervals ◽  
Empirical Model ◽  
Resilient Modulus ◽  
Cohesive Soil ◽  
Repeated Loading ◽  
Subgrade Soils ◽  
Permanent Strain ◽  
Proposed Model

The resilient modulus and cumulative permanent strain of subgrade soils under anticipated repeated loading are important considerations for the design of a pavement against fatigue and rutting failures. A simple model was developed to evaluate the resilient modulus and accumulated permanent strain of cohesive subgrade soils under repeated loads. The empirical model was derived from the observed behavior of an A-6 cohesive soil. The model was tested against an A-5 soil. The proposed model was found to predict adequately the resilient modulus and the accumulated plastic strain for all A-6 and A-5 specimens with 90 percent confidence intervals of 0.61 and 1.4, and 0.66 and 1.39, respectively.

Evaluation of the risk of sudden failure of a cohesive soil subjected to cyclic loading

2017 ◽  
Vol 92 ◽  
pp. 419-432 ◽  
Author(s):  
Eliana Martínez ◽  
Hernán Patiño ◽  
Rubén Galindo
Keyword(s):  
Cyclic Loading ◽  
Cohesive Soil ◽  
Sudden Failure
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