Numerical modeling of plastic deformation and failure around a wellbore in compaction and dilation modes

2020 ◽  
Vol 44 (6) ◽  
pp. 823-850 ◽  
Author(s):  
Aboozar Garavand ◽  
Yuri Pavlovich Stefanov ◽  
Yuri Leonidovich Rebetsky ◽  
Rustam Alfredovich Bakeev ◽  
Artem Veniaminovich Myasnikov
Keyword(s):  
Plastic Deformation ◽  
Numerical Modeling ◽  
Deformation And Failure

scholarly journals ANALYSIS OF RHEOLOGICAL MODELS OF PROCESS OF SELF-FORMING OF GLUED WOODEN

2020 ◽  
Vol 16 (2) ◽  
pp. 94-100
Author(s):  
Vladislav Ponomarev ◽  
Galina Kashevarova
Keyword(s):  
Plastic Deformation ◽  
Numerical Modeling ◽  
Moisture Content ◽  
Rheological Model ◽  
Experimental Studies ◽  
Rheological Models ◽  
Model Experiments ◽  
Promising Technology ◽  
Expansion Coefficients ◽  
Elastic And Plastic Deformation

The article considers a promising technology for self-shaping glued wooden elements of curved forms. This method is based on rheological processes occurring in wood, such as dehumidification and swelling of wood and its anisotropic properties. To predict the final curved shape of the wooden structure, the authors analyzed existing rheological models of wood and concluded that the rheological model proposed by European researchers includes the most complete list of factors that affect the process of deformation of wood: elastic and plastic deformation, drying and swelling of wood, deformation of viscous-elastic creep and mechanical sorption deformation. Based on the results of experimental studies and numerical modeling of the change in the curvature of glued wooden elements, which were made by European researchers, it was found that the proposed rheological model of wood needs to be clarified, namely, the correction of hygro-expansion coefficients depending on the moisture content of wood. A further direction of the authors’ research will be aimed at conducting model experiments to determine the hygro-expansion coefficients of different grades of wood depending on the thickness of the wooden elements and the orientation of the layers in the glued structure.

scholarly journals Plastic Deformation of Thin Plates Subjected to Quasi-Static and Dynamic Loadings

2004 ◽  
Vol 1 (1) ◽  
pp. 59 ◽  
Author(s):  
A. A.N. Aljawi
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Thin Plates ◽  
Circular Plates ◽  
Dynamic Impact ◽  
Deformation And Failure ◽  
Simply Supported ◽  
Dynamic Loadings ◽  
The Impact ◽  
Good Agreement

Deformation and failure of thin plates of mild steel were studied under quasi-static and dynamic impact loadings. Particular emphasis was placed on responses of simply supported circular plates subjected to centric orthogonal loadings. The latter comprised loadings due to relatively massive rigid cylindrical strikers with a hemispherical-end as well as a flat-end. The projectile motions featured variable and low impact velocities. Generally, good agreement was found between experimental results and those predicted by finite-element techniques for displacement-time curves and for force histories of the striker. It was concluded that the ABAQUS-based study (both the implicit and the explicit versions) revealed beneficial insights into the impact mechanics of plates by rigid projectiles. 

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