Application of a Coupled Eulerian-Lagrangian Technique on Constructability Problems of Site on Very Soft Soil

Ko, JaeYoun; Jeong, Sangseom; Kim, Junghwan

doi:10.3390/app7101080

Cited by 17 publications

(5 citation statements)

References 15 publications

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“…Both of these factors lead to very high computational costs and, consequently, the simulation process becomes excessively time-consuming. Thus, an alternative Eulerian FEM approach, which implies a free material flow through the mesh without element distortion, is often considered as a more suitable technique for this purpose [43][44][45]. In practice, both Lagrangian and Eulerian techniques are combined in order to yield the best result [46][47][48][49].…”

Section: Broad Aspects Of the Simulation Modelmentioning

confidence: 99%

Interfacial Microstructure Produced during Dissimilar AA6013/Ti-6Al-4V Friction Stir Lap Welding under Zero-Penetration Condition

Kalinenko,

Dolzhenko,

Malopheyev

et al. 2023

Metals

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The purpose of this study was to investigate the interfacial microstructure that was produced during dissimilar friction stir lap welding (FSW) of 6013 aluminum alloy and Ti-6Al-4V. FSW was conducted under a zero-penetration condition, i.e., the welding tool was plunged exclusively into the upper (aluminum) plate of the dissimilar lap joint. To facilitate the interpretation of microstructural processes, finite element modeling (FEM) was applied to evaluate the temperature field within the weld zone. The FEM simulation revealed a very sharp temperature gradient across the dissimilar interface. This effect was attributed to the generation of FSW heat exclusively within the aluminum part and a relatively low thermal conductivity of titanium. The abrupt temperature drop on the titanium side imposed a strict limitation on the diffusion penetration of aluminum and thus resulted in a relatively thin (~0.5 μm) and discontinuous intermetallic compound. Due to the complex chemical composition of the FSWed aluminum alloy, the diffusion processes also involved alloying elements. Consequently, the evolved intermetallic compound had a complicated chemical composition, with the principal elements being aluminum, titanium, silicon, manganese, and magnesium.

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Section: Broad Aspects Of the Simulation Modelmentioning

confidence: 99%

Interfacial Microstructure Produced during Dissimilar AA6013/Ti-6Al-4V Friction Stir Lap Welding under Zero-Penetration Condition

Kalinenko,

Dolzhenko,

Malopheyev

et al. 2023

Metals

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“…Therefore, the pressure to be maintained at interface-A1 (see Figure 2) can be determined. CEL model in Abaqus has advantages in solving mesh distortion in large deformation problems (Konkol, 2015;Ko et al, 2017;Zhen et al, 2017), which has been successfully used to study the behavior of anchors during dynamic installation in nonhomogeneous clay (Kim and Hossain, 2017) and optimize the gravity coring (Qin et al, 2016). The Euler mesh used in the CEL approach can be void domain, or part or all of it is occupied by more than one material, and its volume fraction represents the part of the mesh filled with a specific material.…”

Section: Numerical Simulation Of Secondary Samplingmentioning

confidence: 99%

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Guo

Zhou²,

Ge³

et al. 2022

Front. Mar. Sci.

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Methane leakage at the interface between sediment and overlying seawater is an important basis for gas hydrate exploration. Therefore, a transfer device with working pressure of 30MPa and corresponding scheme are proposed to separate and transfer the sediment and overlying water inside the sampler under the condition of pressure-retaining. Based on the pressure relief valve with adjustable threshold pressure, the device transfers the overlying water by compressing the internal volume and transfers the sediment by secondary sampling. The performance of transfer device is studied by simulation and experiment. Based on the coupled Eulerian-Lagrangian approach in the Abaqus, the secondary sampling was investigated, and the penetration resistance and coring rate of the secondary sampling tube are 141N and 86.2%, respectively. By using the hydraulic simulation software AMESim, the pressure fluctuation caused by the movement of the mechanism during the transfer process was studied, and the pressure fluctuation amplitude is within 0.89 MPa. Furthermore, the laboratory transfer tests were carried out under high pressure conditions, and meantime, the simulation results are verified. Under the working condition of 30MPa, the device can maintain a pressure loss of no more than 8.0% (2.4MPa) within two hours, maintain pressure fluctuations during the transfer process within 4.8% (1.44MPa), and ensure that the pressure in the culture kettle decreases by 4.7% relative to the pressure in the sampler after the transfer, which shows the feasibility of the device application.

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“…Geotechnics 2022, 2, FOR PEER REVIEW 3 selectively mesh the analysis of components according to the physics being modelled, with the Eulerian technique used in regions undergoing large deformations and the remaining using the conventional Lagrangian technique. The CEL method has found many applications in simulating geotechnical problems, such as in laboratory element testing [12], penetration tests in clays [13], ground improvement applications [14], and water-soil interaction problems [15], among others. In this paper, the CEL method, implemented through the FE software Abaqus, has been used to simulate and analyse the drilling process involved in performing the SDS test in a sandy deposit with specified relative density and effective overburden pressure.…”

Section: Estimation Of Rod Friction During Sdsmentioning

confidence: 99%

“…That is, the CEL method allows the user to selec-tively mesh the analysis of components according to the physics being modelled, with the Eulerian technique used in regions undergoing large deformations and the remaining using the conventional Lagrangian technique. The CEL method has found many applications in simulating geotechnical problems, such as in laboratory element testing [12], penetration tests in clays [13], ground improvement applications [14], and water-soil interaction problems [15], among others.…”

Section: Introductionmentioning

confidence: 99%

Large Displacement Finite Element Modelling of the Screw Driving Sounding Test in Sandy Soil Using the Coupled Eulerian-Lagrangian Method

Mirjafari¹,

Orense

Das

2022

Geotechnics

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The Screw Driving Sounding (SDS) is a recently developed in-situ testing method for soil/site characterisation. To better understand the mechanism of testing, it is essential to create a simulation model for the SDS test to assist in better understanding the response and in improving the testing process, not to mention the development of empirical correlations to estimate geotechnical parameters for use in design. Complex problems involving large deformations are usually difficult to solve with the classical finite element (FE) method because large deformations can lead to large mesh distortions and contact problems. In this paper, a computational model using the finite element method is developed to simulate the drilling process involved in SDS tests; the Coupled Eulerian-Lagrangian (CEL) approach is used to deal with large deformation problems. The SDS drilling process in a sandy deposit with defined stress states (i.e., relative density and effective confining pressure) is simulated, and the SDS-derived parameters are monitored. Based on the simulation results, a chart was established to correlate the measured SDS parameter with the internal friction angle for different vertical effective overburden stresses. The derived chart is validated with the results of laboratory tests performed on samples taken from several sites in Christchurch, NZ, adjacent to the locations of the SDS tests. The results show that the CEL FE framework can model complex physical processes encountered during the SDS drilling. Moreover, the developed chart can be used to estimate the friction angle of the sandy soil based on the SDS-measured torque at a given depth.

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Application of a Coupled Eulerian-Lagrangian Technique on Constructability Problems of Site on Very Soft Soil

Cited by 17 publications

References 15 publications

Interfacial Microstructure Produced during Dissimilar AA6013/Ti-6Al-4V Friction Stir Lap Welding under Zero-Penetration Condition

Interfacial Microstructure Produced during Dissimilar AA6013/Ti-6Al-4V Friction Stir Lap Welding under Zero-Penetration Condition

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Large Displacement Finite Element Modelling of the Screw Driving Sounding Test in Sandy Soil Using the Coupled Eulerian-Lagrangian Method

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