Static Fatigue Controls Particle Crushing and Time Effects in Granular Materials

Lade, Poul V.; Karimpour, Hamid

doi:10.3208/sandf.50.573

Cited by 57 publications

(15 citation statements)

References 32 publications

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“…The resistance of the sand bed to cone penetration is typically found lower immediately after compaction, which is contrary to expectations, but this penetration resistance increases over time in a matter of weeks and months (Mitchell and Solymar 1984). An evidence for time-dependent behavior of sand was discussed, for instance, in Afifi and Woods (1971), Dowding and Hryciw (1986), Mesri et al (1990), Schmertmann (1991), Baxter and Mitchell (2004), Lade and Karimpour (2010), and others. Still, this behavior is considered a continuing Enigma (Mitchell 2008).…”

Section: Introductionmentioning

confidence: 81%

Static Fatigue at Grain Contacts: A Key Cause of Time Effects in Sand

Nadukuru

Michałowski

2014

Geo-Congress 2014 Technical Papers

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Behavior of disturbed sand deposits is known to be time-dependent, but the nature of this dependency is still the subject of research. A hypothesis is suggested, which considers delayed fracturing of the micro-morphological features on grain surfaces in contact, as the primary cause of time effects in sand. Investigation of micromorphology was carried out first, followed by grain-to-grain load tests and modified consolidometer tests. Experimental evidence is consistent with the suggested hypothesis.

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Section: Introductionmentioning

confidence: 81%

Static Fatigue at Grain Contacts: A Key Cause of Time Effects in Sand

Nadukuru

Michałowski

2014

Geo-Congress 2014 Technical Papers

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“…The first two terms are functions of breakage, while the third tracks with the increasing breakage as the sample is further sheared. Hence, it is not a surprise that the total work done on a sample may correlate well with the amount of breakage under similar loading conditions (e.g., Miura and Ohara, 1979;Lade and Karimpour, 2010). Nevertheless, the total work done on a sample cannot be adopted as a measure for breakage in a general sense.…”

Section: Application Of Work For Quantifying Particle Breakagementioning

confidence: 94%

“Particle breakage and the critical state of sand” by Ghafghazi, M., Shuttle, D.A., and DeJong, J.T. [Soils and Foundations 54 (3) (2014) 451–461]

Ghafghazi

Shuttle

DeJong

2015

Soils and Foundations

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“…In brittle materials, such as quartz, static fatigue is 7 due to slow growth of sub-critical cracks to a length at which they will propagate catastrophically. Lade and Karimpour (2010) explained this phenomenon and the consequence in granular materials.…”

Section: Page 5 Of 68mentioning

confidence: 95%

“…On the mechanism behind rate effects, Lade andLiu (1998), Lade (2007), Lade et al (2009, Lade and Karimpour (2010), Karimpour andLade (2010, 2013) and Karimpour (2012) proposed that changes in the developed force chains in grain assemblies can explain creep and stress relaxation behaviors in sand. This is because different boundary conditions prevail as a consequence of particle crushing, which is due to static fatigue.…”

Section: Page 5 Of 68mentioning

confidence: 98%

Stress relaxation behavior in Virginia Beach sand

Lade

Karimpour

2015

Can. Geotech. J.

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Effects of strain rate on the stress-strain and subsequent stress relaxation behaviors have been studied by performing triaxial compression tests on dense Virginia Beach sand specimens at three different strain rates (ratio of 256 between the slowest and the fastest) under low and high confining pressures. For the tests performed under low confining pressure, the specimens that were initially sheared at a faster rate showed a slightly higher amount of stress relaxation, but almost identical stress-strain behaviors were achieved. For tests performed under high confining pressure, the same amount of strength was achieved at high axial strains (10% to 20%) but specimens sheared at higher strain rates showed a slightly stiffer stress-strain response at low axial strains (up to 10%). Similar to the tests performed under low confining pressure, higher strain rates produced to some extent higher amounts of stress relaxation.Effects of correction of axial strain due to load cell expansion and drainage condition during stress relaxation have also been studied and the results indicated that correction of axial strain and undrained condition will both increase the observed amount of stress relaxation.Moreover, a 1-day stress relaxation curve was obtained by connecting the ending stress-strain points of six stress relaxation tests initiated at different deviator stress levels, and this curve was found to be different from the 1-day creep curve obtained from a previous study. A long-term stress relaxation test was also performed, and it showed linear reduction of deviator stress with the logarithm of time during stress relaxation. Observations made are all aligned with the phenomenon of static fatigue and the proposed mechanism for time effects in granular materials.

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Static Fatigue Controls Particle Crushing and Time Effects in Granular Materials

Cited by 57 publications

References 32 publications

Static Fatigue at Grain Contacts: A Key Cause of Time Effects in Sand

Static Fatigue at Grain Contacts: A Key Cause of Time Effects in Sand

“Particle breakage and the critical state of sand” by Ghafghazi, M., Shuttle, D.A., and DeJong, J.T. [Soils and Foundations 54 (3) (2014) 451–461]

Stress relaxation behavior in Virginia Beach sand

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