Benchmark problems and testing of a finite element code for solidification in investment castings

1990 ◽  
Vol 30 (7) ◽  
pp. 1301-1320 ◽  
Author(s):  
U. Chandra
Keyword(s):  
Finite Element ◽  
Benchmark Problems ◽  
Finite Element Code

scholarly journals Dynamic Characters of Stiffened Composite Conoidal Shell Roofs with Cutouts: Design Aids and Selection Guidelines

2013 ◽  
Vol 2013 ◽  
pp. 1-18 ◽  
Author(s):  
Sarmila Sahoo
Keyword(s):  
Finite Element ◽  
Laminated Composite ◽  
Shell Element ◽  
Beam Element ◽  
Mode Shapes ◽  
Benchmark Problems ◽  
Curved Beam ◽  
Finite Element Code ◽  
Fundamental Frequencies ◽  
Curved Beam Element

Dynamic characteristics of stiffened composite conoidal shells with cutout are analyzed in terms of the natural frequency and mode shapes. A finite element code is developed for the purpose by combining an eight-noded curved shell element with a three-noded curved beam element. The code is validated by solving benchmark problems available in the literature and comparing the results. The size of the cutouts and their positions with respect to the shell centre are varied for different edge constraints of cross-ply and angle-ply laminated composite conoids. The effects of these parametric variations on the fundamental frequencies and mode shapes are considered in details. The results furnished here may be readily used by practicing engineers dealing with stiffened composite conoids with cutouts central or eccentric.

A Crosslink Constraint Method for Modeling Episodic Dynamic Rupture on Intersecting Faults

2020 ◽  
Vol 91 (2A) ◽  
pp. 1030-1041 ◽  
Author(s):  
Chunfang Meng ◽  
Bradford Hager
Keyword(s):  
Finite Element ◽  
Open Source ◽  
Benchmark Problems ◽  
Finite Element Code ◽  
Dynamic Rupture ◽  
Slip Direction ◽  
Constraint Equations ◽  
Main Fault ◽  
Constraint Method ◽  
Dynamic Slip

Abstract We present a crosslink constraint method for numerically modeling dynamic slip on intersecting faults, without prescribing slip (dis-)continuation directions. The fault intersections are constrained by crosslinked split nodes, such that the slip can only be continuous on one of the two intersecting faults at a time and location. The method resolves the episodic intersection offset by examining the dynamic fault traction resulting from two sets of constraint equations, one for each slip direction. To verify this method, we modify two benchmark problems, hosted at Southern California Earthquake Center (SCEC), by allowing a branching fault to step across a main fault. The modified SCEC problem results agree with our expectations that the intersection offset scenarios are dictated by the nucleation patch location and initial fault traction. This new method comes with an open-source finite-element code Defmod.

An Eight-Node Hexahedral Finite Element with Rotational DOFs for Elastoplastic Applications

2019 ◽  
Vol 11 (1) ◽  
pp. 54-66
Author(s):  
Ayoub Ayadi ◽  
Kamel Meftah ◽  
Lakhdar Sedira ◽  
Hossam Djahara
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Plastic Zone ◽  
Displacement Vector ◽  
Small Strain ◽  
Benchmark Problems ◽  
Plasticity Model ◽  
Vector Approximation ◽  
Calculation Code

Abstract In this paper, the earlier formulation of the eight-node hexahedral SFR8 element is extended in order to analyze material nonlinearities. This element stems from the so-called Space Fiber Rotation (SFR) concept which considers virtual rotations of a nodal fiber within the element that enhances the displacement vector approximation. The resulting mathematical model of the proposed SFR8 element and the classical associative plasticity model are implemented into a Fortran calculation code to account for small strain elastoplastic problems. The performance of this element is assessed by means of a set of nonlinear benchmark problems in which the development of the plastic zone has been investigated. The accuracy of the obtained results is principally evaluated with some reference solutions.

Buckling characteristics of cut-out borne composite stiffened hyperbolic paraboloid shell panel

2021 ◽  
pp. 146442072110058
Author(s):  
Sarmila Sahoo
Keyword(s):  
Finite Element ◽  
Orientation Angle ◽  
Buckling Load ◽  
Benchmark Problems ◽  
Hyperbolic Paraboloid ◽  
Element Analysis ◽  
Load Effect ◽  
Global Buckling ◽  
Fiber Orientation Angle ◽  
Shell Panel

The present study investigates buckling characteristics of cut-out borne stiffened hyperbolic paraboloid shell panel made of laminated composites using finite element analysis to evaluate the governing differential equations of global buckling of the structure. The finite element code is validated by solving benchmark problems from literature. Different parametric variations are studied to find the optimum panel buckling load. Laminations, boundary conditions, depth of stiffener and arrangement of stiffeners are found to influence the panel buckling load. Effect of different parameters like cut-out size, shell width to thickness ratio, degree of orthotropy and fiber orientation angle of the composite layers on buckling load are also studied. Parametric and comparative studies are conducted to analyze the buckling strength of composite hyperbolic paraboloid shell panel with cut-out.

Design of object oriented finite element code

2001 ◽  
Vol 32 (10-11) ◽  
pp. 759-767 ◽  
Author(s):  
B Patzák ◽  
Z Bittnar
Keyword(s):  
Finite Element ◽  
Object Oriented ◽  
Finite Element Code

Python-based finite element code used as a universal and modular tool for electronic structure calculation

2013 ◽  
Author(s):  
Robert Cimrman ◽  
Miroslav Tůma ◽  
Matyáš Novák ◽  
Ondřej Čertík ◽  
Jiří Plešek ◽  
...  
Keyword(s):  
Finite Element ◽  
Electronic Structure ◽  
Structure Calculation ◽  
Electronic Structure Calculation ◽  
Finite Element Code
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