Dynamic Analysis of Shipping Cask Subjected to Sequential Bolt Preload and Impact Loads

2009 ◽  
Author(s):  
Tsu-te Wu
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Numerical Integration ◽  
Dynamic Responses ◽  
Integration Scheme ◽  
Impact Loads ◽  
Element Mesh ◽  
Bolt Preload ◽  
Numerical Integration Scheme ◽  
Structural Responses

This paper presents an improved methodology for evaluating the dynamic responses of shipping casks subjected to the sequential HAC impact loads. The methodology utilizes the import technique of the finite-element mesh and the analytical results form one dynamic analysis using explicit numerical integration scheme into another dynamic analysis also using explicit numerical integration scheme. The new methodology presented herein has several advantages over conventional methods. An example problem is analyzed to illustrate the application of the present methodology in evaluating the structural responses of a shipping cask to the sequential HAC loading.

Inelastic, Nonlinear Analysis of Stiffened Shells of Revolution by Numerical Integration

1974 ◽  
Vol 96 (2) ◽  
pp. 121-130 ◽  
Author(s):  
H. S. Levine ◽  
V. Svalbonas
Keyword(s):  
Numerical Integration ◽  
Cross Sections ◽  
Thermal Loading ◽  
Large Deflection ◽  
Kinematic Hardening ◽  
Integration Scheme ◽  
Shells Of Revolution ◽  
Stiffened Shells ◽  
Numerical Integration Scheme ◽  
Deflection Analysis

This paper describes the latest addition to the STARS system of computer programs, STARS-2P, for the plastic, large deflection analysis of axisymmetrically loaded shells of revolution. The STARS system uses a numerical integration scheme to solve the governing differential equations. Several unique features for shell of revolution programs that are included in the STARS-2P program are described. These include orthotropic nonlinear kinematic hardening theory, a variety of shell wall cross sections and discrete ring stiffeners, cyclic and nonproportional mechanical and thermal loading capability, the coupled axisymmetric large deflection elasto-plastic torsion problem, an extensive restart option, arbitrary branching capability, and the provision for the inelastic treatment of smeared stiffeners, isogrid, and waffle wall constructions. To affirm the validity of the results, comparisons with available theoretical and experimental data are presented.

Dynamic Analysis of Radioactive Material Package With Clamp-Ring Closure

2004 ◽  
Author(s):  
Tsu-te Wu ◽  
Lawrence F. Gelder ◽  
Allen C. Smith
Keyword(s):  
Dynamic Analysis ◽  
Safety Concern ◽  
Numerical Technique ◽  
Ring Closure ◽  
Foot Drop ◽  
Radioactive Material ◽  
Integration Scheme ◽  
Test Results ◽  
Numerical Integration Scheme ◽  
Drop Tests

Separation of the closure lid from the drum-type radioactive material packages employing the conventional clamp-ring closure has been a safety concern. Currently, the evaluation of drum-closure separation problems resorts to expensive and time-consuming tests. Therefore, an analytical capability to predict drum-closure separation is desired. However, the conventional methods of dynamic analysis are not applicable to this subject. The difficulty of the problem mainly lies in solving the complicated preload stresses on the multiple contacted surfaces during claim-ring tightening and in integrating the preload results with the subsequent drop simulation. A technique has been previously proposed by Wu for the dynamic analyses of containers with locking-ring closures (Reference 1). This paper presents a refinement of the proposed technique and also extends the technique from the dynamic simulation of one single drop to the simulation of two sequential drops. The finite-element method with explicit numerical integration scheme is utilized to simulate both the closure bolt tightening process and the drop impact. The essential aspects of the proposed technique include: quasi-static simulation of clamp-ring tightening process; association of the floor motion with the package motion before the drop simulation starts; and creation of the package velocity before impact starts. To verify the proposed numerical technique, an analysis is performed for the 6M Package with a standard clamp-ring closure to simulate the following three sequential loading conditions: the preload caused by tightening the clamp ring; a NCT 4-foot drop; and a HAC 30-foot drop. The analytical results are compared with the results of the sequential NCT and HAC drop tests of a 6M Package with the standard clamp-ring closure. The test results have verified that the proposed numerical technique is capable of predicting the drum closure separation with respect to drop heights as well as the deformed shape of the package.

Study on Dynamics Characteristics of Concrete Floating Slab Track in Urban Track

2006 ◽  
Vol 302-303 ◽  
pp. 700-705 ◽  
Author(s):  
Gao Liang ◽  
Ke Ming Yin ◽  
Ge Yan Zhang
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Dynamic Responses ◽  
Finite Element Analyses ◽  
Analysis Model ◽  
Slab Track ◽  
Stiffness And Damping

In this paper, in order to do research on the characteristics of reducing vibration and declining noise of concrete floating slab track, the vertical dynamic analysis model of vehiclefloating slab track is established with the use of finite element analyses method. By using this model, dynamic responses of floating slab track are studied under different conditions of train’s speed, stiffness and damping of infrastructure, structure size, etc. On the basis of this research, some suggestions for design of floating slab track are put forward.

Sign in / Sign up

Export Citation Format

Share Document