Plastic Crushing Behavior of Thin-Walled Spheres

2008 ◽  
Vol 33-37 ◽  
pp. 719-724
Author(s):  
P. Xue ◽  
J.P. He ◽  
Yu Long Li
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Deformation Process ◽  
Experimental Result ◽  
Plastic Deformation Process ◽  
Post Buckling ◽  
Thin Walled ◽  
Crushing Behavior

Plastic crushing behavior of thin-walled spheres under various loading cases is studied using Finite Element Method. The entire plastic deformation process is tracked during the post-buckling process. The results are compared with the experimental results reported in literature [13], and very good agreements between the numerical simulation and the experimental result are achieved.

Post-buckling inelastic analysis of thin-walled metal members using the Generalised Beam Theory

2019 ◽  
Author(s):  
Miguel Abambres ◽  
Dinar Camotim ◽  
Miguel Abambres
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Beam Theory ◽  
Flow Theory ◽  
Promising Alternative ◽  
Inelastic Analysis ◽  
Post Buckling ◽  
Thin Walled ◽  
Shell Finite Element ◽  
Generalised Beam Theory

A 2nd order inelastic Generalised Beam Theory (GBT) formulation based on the J2 flow theory is proposed, being a promising alternative to the shell finite element method. Its application is illustrated for an I-section beam and a lipped-C column. GBT results were validated against ABAQUS, namely concerning equilibrium paths, deformed configurations, and displacement profiles. It was concluded that the GBT modal nature allows (i) precise results with only 22% of the number of dof required in ABAQUS, as well as (ii) the understanding (by means of modal participation diagrams) of the behavioral mechanics in any elastoplastic stage of member deformation .

scholarly journals The Study of Buckling and Post-Buckling of a Step-Variable FGM Box

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 918 ◽  
Author(s):  
Leszek Czechowski ◽  
Zbigniew Kołakowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Functionally Graded Material ◽  
Asymptotic Theory ◽  
Functionally Graded ◽  
Pure Alumina ◽  
Mixed Case ◽  
Graded Material ◽  
Post Buckling ◽  
Thin Walled

This work concerns the analysis of a thin-walled box made of ceramic and step-variable functionally graded material (FGM) subjected to compression. The components of the box taken into account were pure alumina and aluminium-alumina graded material. The problem was solved on the basis of a finite element method and Koiter’s asymptotic theory using a semi-analytical method (SAM). It analysed both the buckling state and the post-buckling state of the box. In addition, three conditions were considered: The presence of alumina outside or inside of the box and a mixed case. The obtained results were presented and discussed.

Numerical Simulation on Efficient Spinning Technology Based on Multi-Point Adjusting Principle

2011 ◽  
Vol 189-193 ◽  
pp. 2993-2996
Author(s):  
Xue Peng Gong
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Plastic Deformation ◽  
Finite Element ◽  
Flexible Manufacturing ◽  
High Efficiency ◽  
Equivalent Stress ◽  
Experimental Result ◽  
Element Analysis ◽  
Fea Model

In order to realize high efficiency and flexible manufacturing for rotary surfaces, efficient spinning technology (EST) is researched. It is the combination of multi-point forming and traditional spinning. Principle of EST is described, traditional spinning method is compared with it, and characteristics of it are analyzed. Finite element analysis (FEA) model of disc-shape part is established, EST process is analyzed, equivalent stress and plastic strain distributions are analyzed. EST equipment is developed, and the experiments are made. Results indicate: EST process consists of four stages; equivalent stress in sheet metal’s center region and bendable rollers active region exceeds yield stress, and plastic deformation is generated; experimental result accords with simulation result. Feasibility of EST is validated by simulation and experimental results.

scholarly journals Crushing Behavior of Thin-Walled Hexagonal Tubes with Partition Plates

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Dai-Heng Chen ◽  
Kenichi Masuda
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Axial Compression ◽  
Compressive Load ◽  
Full Length ◽  
Compression Load ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Crushing Behavior ◽  
Element Method

The crushing behaviour of hexagonal thin-walled tube with partition plates subjected to axial compression is studied by using finite element method. It is found that, in the crushing process, the folds, which generate along the full length of the tube, come to be crushed simultaneously and the compressive load will not descend, since the compressive load produced in the central part does not descend with the folds forming on outer walls. Therefore, in order to suppress a fluctuation of the compression load in crushing of the tube and to raise its average compression load, it is an effective method to introduce corner parts, especially corner parts where three plates intersect, in the geometry of the thin-walled tube.

Koiter’s Reduction Finite Element Method for Nonlinear Stability Analysis of Thin-Walled Shells

2019 ◽  
Vol 17 (01) ◽  
pp. 1843004 ◽  
Author(s):  
Ke Liang ◽  
Qin Sun
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Path Following ◽  
Nonlinear Prediction ◽  
Nonlinear Stability Analysis ◽  
Geometric Imperfection ◽  
Thin Walled Structures ◽  
Post Buckling ◽  
Thin Walled ◽  
Element Method

Thin-walled structures are widely used in aeronautical and aerospace engineering. Conical and cylindrical shells structures, under axial compression, are prone to failure by buckling and typically show a snap-back phenomenon in the end-shortening curve. Path-following technologies based on Newton-type methods have difficulties to trace reliably the snap-back response due to the extremely sharp turning angle near the limit point. In this paper, a Koiter’s reduction finite element method, termed the Koiter–Newton (KN) method, is presented to trace reliably the post-buckling path of cylinders and cones considering either linear buckling modes or dimples from lateral perturbation loads as geometric imperfection. A robust algorithm based on the bifurcation-detection technique is applied during the solution of the reduced order model to achieve a successful path-tracing. The numerical results presented reveal that the nonlinear prediction obtained from Koiter’s perturbation theory at the unloaded state of the structure is numerically accurate up to the buckling load and the initial post-buckling path.

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