Buckling of Thin-walled Cylinder Shell Specimens with Cut-out Imperfections

2009 ◽  
Vol 96 (6) ◽  
pp. 79-88
Author(s):  
Cheng Zhao ◽  
Hiroshi Matsuda ◽  
Chihiro Morita ◽  
Mei Huang
Keyword(s):  
Thin Walled ◽  
Walled Cylinder

Improving the honing accuracy of the holes of stepped thin-walled cylinders

2021 ◽  
pp. 49-54
Author(s):  
V.A. Ogorodov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cutting Forces ◽  
Software Package ◽  
The Finite Element Method ◽  
Radial Forces ◽  
Thin Walled ◽  
Hole Machining ◽  
Deform 3D ◽  
Walled Cylinder

Different ways of fixing of stepped thin-walled cylinders during honing are analyzed. The conditions for increasing the accuracy of hole machining are determined on the basis of unevenness of cylinder deformations from clamping forces and radial forces simulating cutting forces. The studies used the finite element method and the DEFORM-3D V6.1 software package. Keywords: honing, stepped thin-walled cylinder, hole, accuracy, fixing method, deformation, unevenness, DEFORM-3D V6.1 software package. [email protected]

On the Deployment of Multistable Kresling Origami-Inspired Structures

2019 ◽  
Author(s):  
Narayanan Kidambi ◽  
K. W. Wang
Keyword(s):  
Mechanical Properties ◽  
Rotation Angle ◽  
Axial Direction ◽  
Deployable Structures ◽  
Dynamic Analyses ◽  
Thin Walled ◽  
Six Degree Of Freedom ◽  
Shape Changes ◽  
Significant Attention ◽  
Walled Cylinder

Abstract Origami designs have attracted significant attention from researchers seeking to develop new types of deployable structures due to their ability to undergo large and complex yet predictable shape changes. The Kresling pattern, which is based on a natural accumulation of folds and creases during the twist-buckling of a thin-walled cylinder, offers a great example for the design of deployable systems that expand uniaxially into tubes or booms. However, much remains to be understood regarding the characteristics of Kresling-based deployable systems, and their dynamics during the deployment process remain largely unexplored. Hence this research investigates the deployment of Kresling origami-inspired structures, employing a full six-degree-of-freedom truss-based model to study their dynamics under different conditions. Results show that tuning the initial rotation angle of a structure gives rise to several qualitatively distinct mechanical properties and stability characteristics, each of which has different implications for the design of the deployable systems. Dynamic analyses reveal the robustness of Kresling structures to out-of-axis perturbations while remaining compliant in the axial direction. These findings suggest that Kresling-based designs can form the basis for the development of new types of deployable structures and systems with tunable performance.

Parameter Inversion of Thin-Walled Structure Using Numerical Optimization Approach

2011 ◽  
Vol 308-310 ◽  
pp. 1614-1618
Author(s):  
Zhuo Meng ◽  
Qin Sun ◽  
Jin Feng Jiang
Keyword(s):  
Numerical Optimization ◽  
Impact Load ◽  
Optimization Approach ◽  
Optimization Software ◽  
Material Parameters ◽  
Finite Element Software ◽  
Whole Process ◽  
Parameter Inversion ◽  
Thin Walled ◽  
Walled Cylinder

Based on the theory of structure impact dynamic and numerical optimization, application of SQP algorithm in nonlinear parameter inversion is demonstrated in this paper by combining the optimization software and finite element software. Parameter inversion of thin-walled cylinder subjected to axial impact load is studied. The material parameters of thin-walled cylinder are obtained from inversion; besides, the whole process of numerical optimization parameter inversed method is demonstrated.

The influence of non-dissipative quantities in kinematic hardening plasticity

2004 ◽  
Vol 218 (6) ◽  
pp. 615-622 ◽  
Author(s):  
M Wallin ◽  
M Ristinmaa ◽  
N S Ottosen
Keyword(s):  
Kinematic Hardening ◽  
Deformation Gradient ◽  
Material Behaviour ◽  
Dissipative Part ◽  
Real Material ◽  
Shear Problem ◽  
Evolution Laws ◽  
Thin Walled ◽  
Plastic Parts ◽  
Walled Cylinder

A kinematic hardening plasticity model valid for finite strains is presented. The model is based on the well-known multiplicative split of the deformation gradient into elastic and plastic parts. The basic ingredient in the formulation is the introduction of a locally defined configuration—a centre configuration—which is associated with a deformation gradient that is used to characterize the kinematic hardening behaviour. The non-dissipative quantities allowed in the model are found when the plastic and kinematic hardening evolution laws are split into two parts: a dissipative part, which is restricted by the dissipation inequality, and a non-dissipative part, which can be chosen without any thermodynamic considerations. To investigate the predictive capabilities of the proposed kinematic hardening formulation, necking of a bar is considered. Moreover, to show the influence of the non-dissipative quantities, the simple shear problem and torsion of a thin-walled cylinder are considered. The numerical examples reveal that the non-dissipative quantities can affect the response to a large extent and are consequently valuable and important ingredients in the formulation when representing real material behaviour.

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