A fast random method for three-dimensional analysis of train-track-soil dynamic interaction

2018 ◽  
Vol 115 ◽  
pp. 252-262 ◽  
Author(s):  
Lidong Wang ◽  
Zhihui Zhu ◽  
Yu Bai ◽  
Qi Li ◽  
Pedro Alves Costa ◽  
...  
Keyword(s):  
Dimensional Analysis ◽  
Three Dimensional ◽  
Dynamic Interaction ◽  
Train Track ◽  
Soil Dynamic ◽  
Random Method

On the Dynamic Behaviour of Offshore Foundation Footings in a Moving Ocean Bed

2006 ◽  
Author(s):  
Vincent O. S. Olunloyo ◽  
Charles A. Osheku
Keyword(s):  
Dynamic Behaviour ◽  
Integral Transform ◽  
Three Dimensional ◽  
Dynamic Interaction ◽  
External Excitation ◽  
Foundation Soil ◽  
Hydrodynamic Loading ◽  
Response Profiles ◽  
And Performance ◽  
Soil Dynamic

The reliability of partly submerged production storage platforms deployed for the exploitation of geo-resources in deep and ultra-deep offshore locations is strongly influenced by the dynamic stability and performance of their foundation footings under hydrodynamic loading and external excitation. This paper presents an integral transform approach for investigating the effects of the three-dimensional motion of the gripping ocean bed subsoil layer under pressurized external excitation. For this, the fluid-foundation-soil dynamic interaction boundary value problem is modeled as an elastic plate on an elastic foundation. In particular, closed form expressions for the dynamic response profiles and the natural frequency of vibration as modulated by the ocean bed poro-mechanics are analysed and presented.

In situ investigation of the primary recrystallization of alpha titanium in HVEM

1978 ◽  
Vol 36 (1) ◽  
pp. 634-635
Author(s):  
S. Naka ◽  
R. Penelle ◽  
R. Valle
Keyword(s):  
Dimensional Analysis ◽  
Texture Evolution ◽  
Cold Work ◽  
Three Dimensional ◽  
Primary Recrystallization ◽  
Thin Foils ◽  
In Situ Investigation ◽  
Grain Growth Model ◽  
Alpha Titanium

The in situ experimentation technique in HVEM seems to be particularly suitable to clarify the processes involved in recrystallization. The material under investigation was unidirectionally cold-rolled titanium of commercial purity. The problem was approached in two different ways. The three-dimensional analysis of textures was used to describe the texture evolution during the primary recrystallization. Observations of bulk-annealed specimens or thin foils annealed in the microscope were also made in order to provide information concerning the mechanisms involved in the formation of new grains. In contrast to the already published work on titanium, this investigation takes into consideration different values of the cold-work ratio, the temperature and the annealing time.Two different models are commonly used to explain the recrystallization textures i.e. the selective grain growth model (Beck) or the oriented nucleation model (Burgers). The three-dimensional analysis of both the rolling and recrystallization textures was performed to identify the mechanismsl involved in the recrystallization of titanium.

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