The Relation between Static Young’s Modulus and Dynamic Bulk Modulus of Granular Materials and the Role of Stress History

Gheibi, Amin; Hedayat, Ahmadreza

doi:10.1061/9780784481486.039

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…Note that the dynamic modulus from resonance testing was significantly greater than the estimated elastic modulus from the UCS tests. This is an expected outcome, as has been demonstrated for various geomaterials [ 86 , 87 , 88 , 89 , 90 ] because of differences in strain rate, material heterogeneity and the volume probed, anisotropic effects, stress history, and strain amplitude. For instance, the static elastic modulus testing in this study involved large strains relative to the comparatively small strains in resonant frequency dynamic modulus testing.…”

Section: Resultssupporting

confidence: 67%

“…Figure 9 also demonstrates that the dynamic and elastic (static) moduli increased with increasing SFS content, with the dynamic modulus increasing more than the elastic modulus. As discussed in Section 3.4 , the dynamic and elastic moduli are not equivalent, as demonstrated in other studies [ 86 , 87 , 88 , 89 , 90 ], with the dynamic modulus often being a greater magnitude than the elastic modulus [ 86 ]. Therefore, the moduli behavior in Figure 9 is in agreement with the literature.…”

Section: Resultsmentioning

confidence: 84%

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Stabilization of a Clayey Soil with Ladle Metallurgy Furnace Slag Fines

et al. 2020

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The research study described in this paper investigated the potential to use steel furnace slag (SFS) as a stabilizing additive for clayey soils. Even though SFS has limited applications in civil engineering infrastructure due to the formation of deleterious expansion in the presence of water, the free CaO and free MgO contents allow for the SFS to be a potentially suitable candidate for clayey soil stabilization and improvement. In this investigation, a kaolinite clay was stabilized with 10% and 15% ladle metallurgy furnace (LMF) slag fines by weight. This experimental study also included testing of the SFS mixtures with the activator calcium chloride (CaCl2), which was hypothesized to accelerate the hydration of the dicalcium silicate phase in the SFS, but the results show that the addition of CaCl2 was not found to be effective. Relative to the unmodified clay, the unconfined compressive strength increased by 67% and 91% when 10% and 15% LMF slag were utilized, respectively. Likewise, the dynamic modulus increased by 212% and 221% by adding 10% and 15% LMF slag, respectively. Specifically, the LMF slag fines are posited to primarily contribute to a mechanical rather than chemical stabilization mechanism. Overall, these findings suggest the effective utilization of SFS as a soil stabilization admixture to overcome problems associated with dispersive soils, but further research is required.

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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 84%

Stabilization of a Clayey Soil with Ladle Metallurgy Furnace Slag Fines

et al. 2020

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“…BC simulation results agreed well with results from the dynamic method; however, this study aims to predict static bulk properties of NiTi. Moreover, it was reported that the dynamic method cannot depict stress history [46], which cannot be ignored easily in shape-memory applications. In addition to the disorientation of adjacent grains, grain boundary also affects the elastic modulus of the simulation domain.…”

Section: Elastic Modulus Resultsmentioning

confidence: 99%

Molecular Dynamics Study of Bulk Properties of Polycrystalline NiTi

Lee

Shin

2021

Metals

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Molecular dynamics (MD) simulations were carried out to study the bulk polycrystalline properties of NiTi. Thermally driven phase transitions of NiTi between martensite and austenitewere simulated using single crystalline simulation domains. With external stress boundary conditions, MD simulation successfully predicted experimentally observed phase transformation temperatures of bulk polycrystalline. Elastic characteristics of NiTi martensite were simulated using polycrystalline simulation domains that consist of realistic disorientations and grain boundary structures. The existence of grain disorientation and grain boundary lowered the potential energy of the simulation domain, which led to more realistic elastic modulus prediction. Analysis of simulation domains that predicted realistic bulk polycrystalline properties showed that the major difference between single crystalline and polycrystalline structures is atomic stress distribution.

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“…The effect of the hydrological loads in predicting the soil modulus of elasticity through changing the soil matric suction and degree of saturation has been the subject of fairly extensive studies in recent years 35–40 . In this study, the equation proposed by Oh et al.…”

Section: Climate‐adaptive Geotechnical Design Of Embedded Footingmentioning

confidence: 97%

Climate‐adaptive design approach for embedded footing under extreme climate event

Mahmoudabadi

Ravichandran

2021

Num Anal Meth Geomechanics

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Recent records indicate that extreme climate events adversely affect the performance of earthen structures and superstructures supported on them by varying the strength and deformation properties of subsurface soil. To better design such structures, the effects of climate events must be well understood, and the conventional design procedures must be improved by incorporating the knowledge of climatology in geotechnical engineering. In this study, a new climate‐adaptive design method is developed to investigate the impact of extreme climate events on the safety and serviceability performances of embedded footing through incorporating the site‐specific hydrological loads such as precipitation, evapotranspiration, and water table depth to geotechnical parameters. The proposed method was applied to two arid climate sites in the United States, Austin, TX, and Albuquerque, NM. The site‐specific extreme hydrological cycle was determined based on historical records. The mathematical model was solved for temporal and spatial variations of the degree of saturation and matric suction considering the hydrological loads as the upper and lower boundary conditions, respectively. The results showed that the worst performance (higher elastic settlement and lower ultimate bearing capacity) was observed during the period when the degree of saturation in the influence zone was the highest. The critical design parameters including ultimate bearing capacity and settlement obtained from the proposed method increased by 28% and 35%, respectively, in Austin, compared to those calculated from conventional approaches where the soil is assumed to be fully saturated. In Albuquerque, the increase in ultimate bearing capacity and settlement were 61% and 45%, respectively.

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The Relation between Static Young’s Modulus and Dynamic Bulk Modulus of Granular Materials and the Role of Stress History

Cited by 4 publications

References 15 publications

Stabilization of a Clayey Soil with Ladle Metallurgy Furnace Slag Fines

Stabilization of a Clayey Soil with Ladle Metallurgy Furnace Slag Fines

Molecular Dynamics Study of Bulk Properties of Polycrystalline NiTi

Climate‐adaptive design approach for embedded footing under extreme climate event

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