Inelastic Buckling of Geometrically Imperfect Tubes under External Hydrostatic Pressure

2009 ◽  
Author(s):  
A.P.F. Little ◽  
C.T.F. Ross ◽  
D. Short ◽  
G.X. Brown
Keyword(s):  
Hydrostatic Pressure ◽  
External Hydrostatic Pressure ◽  
Inelastic Buckling

Inelastic Buckling of Rib-Cored Sandwich Cylinders Under External Hydrostatic Pressure

1966 ◽  
Vol 33 (3) ◽  
pp. 593-600 ◽  
Author(s):  
P. S. Theocaris ◽  
P. W. Hill
Keyword(s):  
Hydrostatic Pressure ◽  
Deformation Theory ◽  
Poisson's Ratio ◽  
Smooth Transition ◽  
External Hydrostatic Pressure ◽  
Inelastic Buckling ◽  
Lateral Forces ◽  
Theory Of Plasticity ◽  
Sandwich Shells ◽  
Critical Buckling Pressure

The extension of the equations of Stein and Mayers to include application to inelastic buckling of orthotopic sandwich shells for those classes of loading for which torsion does not act in combination with axial or lateral forces is presented. A deformation theory of plasticity is used to evaluate the 12 remaining orthotropic rigidities for rib-cored sandwiches. The solution for the critical buckling pressure is given for loading by external hydrostatic pressure. The effect of Poisson’s ratio is discussed, and corrections for the elastic compressibility are presented. These corrections permit a smooth transition from elastic to inelastic solutions.

Study of Ductile-to-Brittle Transition in Single Grit Diamond Scribing of Silicon: Application to Wire Sawing of Silicon Wafers

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Hao Wu ◽  
Shreyes N. Melkote
Keyword(s):  
Hydrostatic Pressure ◽  
Silicon Wafers ◽  
Depth Of Cut ◽  
Critical Depth ◽  
External Hydrostatic Pressure ◽  
Tensile Stresses ◽  
Brittle Transition ◽  
Ductile Mode Cutting ◽  
Critical Depth Of Cut ◽  
Ductile To Brittle Transition

The ductile-to-brittle cutting mode transition in single grit diamond scribing of monocrystalline silicon is investigated in this paper. Specifically, the effects of scriber tip geometry, coefficient of friction, and external hydrostatic pressure on the critical depth of cut associated with ductile-to-brittle transition and crack generation are studied via an eXtended Finite Element Method (XFEM) based model, which is experimentally validated. Scribers with a large tip radius are shown to produce lower tensile stresses and a larger critical depth of cut compared with scribers with a sharp tip. Spherical tipped scribers are shown to generate only surface cracks, while sharp tipped scribers (conical, Berkovich and Vickers) are found to create large subsurface tensile stresses, which can lead to nucleation of subsurface median/lateral cracks. Lowering the friction coefficient tends to increase the critical depth of cut and hence the extent of ductile mode cutting. The results also show that larger critical depth of cut can be obtained under external hydrostatic pressure. This knowledge is expected to be useful in optimizing the design and application of the diamond coated wire employed in fixed abrasive diamond wire sawing of photovoltaic silicon wafers.

scholarly journals OPTIMUM BUCKLING DESIGN OF CYLINDRICAL STIFFENER SHELL UNDER EXTERNAL HYDROSTATIC PRESSURE

2018 ◽  
Vol 18 (2) ◽  
pp. 239-252 ◽  
Author(s):  
Rawa Hamed M. Al-Kalali
Keyword(s):  
Hydrostatic Pressure ◽  
Numerical Optimization ◽  
Collapse Load ◽  
Ansys Software ◽  
External Hydrostatic Pressure ◽  
Buckling Mode ◽  
Design Elements ◽  
Design Variables ◽  
Thick Cylinder ◽  
Strength Constraints

This paper present an investigation of the collapse load in cylinder shell under uniformexternal hydrostatic pressure with optimum design using finite element method viaANSYS software. Twenty cases are studied inclusive stiffeners in longitudinal and ringstiffeners. Buckling mode shape is evaluated. This paper studied the optimum designgenerated by ANSYS for thick cylinder with external hydrostatic pressure. The primarygoal of this paper was to identify the improvement in the design of cylindrical shell underhydrostatic pressure with and without Stiffeners (longitudinal and ring) with incorporativetechnique of an optimization into ANSYS software. The design elements in this researchwas: critical load, design variable (thickness of shell (TH), stiffener’s width (B) andstiffener’s height (HF). The results obtained illustrated that the objective is minimizedusing technique of numerical optimization in ANSYS with optimum shell thickness andstiffener’s sizes. In all cases the design variables (thickness of shell) was thicker than themonocoque due to a shell’s thicker is essential to achieve the strength constraints. It can beconcluded that cases (17,18,19, and 20) have more than 90% of un-stiffened critical load.The ring stiffeners causes increasing buckling load than un-stiffened and longitudinalstiffened cylinder.

Plastic buckling of ring-stiffened conical shells under external hydrostatic pressure

2005 ◽  
Vol 32 (1) ◽  
pp. 21-36 ◽  
Author(s):  
Carl T.F. Ross ◽  
Andrew P.F. Little ◽  
Kehinde A. Adeniyi
Keyword(s):  
Hydrostatic Pressure ◽  
External Hydrostatic Pressure ◽  
Plastic Buckling ◽  
Conical Shells
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