Search Results for "buckling"
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Showing 9 open source projects for "buckling"
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Bounds on Interbay Buckling
Bounds on the effect of initial geometric imperfections
An Excel spreadsheet compares the following four bounds on the yield onset pressure due to Interbay imperfections in thin-wall monocoque and ring-stiffened cylindrical pressure vessels: • Bodner-Berks method [1] • Galletly-Bart method [2] • Gordon’s simply supported method [3] • Gordon’s clamped end method [3] Because the first two methods are based on Donnell's equation of equilibrium, they are applicable only for shallow shells—that is for relatively short thin-wall cylinders whose critical buckling mode shapes are characterized by a large number of circumferential lobes. (Reference [1] claims greater than 8 lobes.) This restriction does not apply to the second two methods because they are based on Morley’s equation of equilibrium [4] rather than Donnell’s. Technical documentation is included. -
2
Simple Cylindrical Pressure Vessels
Excel workbooks suitable for preliminary design and analysis
...It plots stresses, deflections and the equilibrium path for imperfect circular cylinders showing the onset of yielding and limit points in relation to elastic and inelastic bifurcation buckling pressures. Two types of initial geometric imperfections, outer diameter out-of-roundness and outer-to-inner diameter eccentricity with a phase angle between them, can be considered. CPVparametric.xlsm, does parametric analyses. It plots performance parameters against depth or pressure for up to five different combinations of materials and shell geometries including initial imperfections. ... -
3
ANYstructure
GUI based steel structure calculation and optimization tool.
...Calculate and optimize the following: Minimum plate thickness (DNV/DNVGL-OS-C101) Minimum section modulus of stiffener/plate (DNVGL-OS-C101) Minimum shear area (DNVGL-OS-C101) Buckling (DNVGL-RP-C201) Fatigue for plate/stiffener connection (DNVGL-RP-C203) Compartments (tank pressures) are created automatically. Pressures on external hull (or any other generic location) is defined by specifying equations. You can optimize single plate/stiffener field or multiple. PYTHON: PIP install ANYstructure Code: https://github.com/audunarn/ANYstructure -
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DAPS4e.6
A Fortran code for design and analysis of ring-stiffened shells
...The following failure modes are considered: • Shell stresses and displacements at mid-bay and ring-frames. • Axisymmetric collapse (AC). • Elastic and Inelastic Interbay Buckling. (EIB and IIB). • Elastic and Inelastic Monocoque Instability (EMI and IMI). • Ring-frame stress and Elastic Instability analysis (EFI). Solutions compare favorably with DTMB experimental results. DAPS4e.6’s IO is managed through a Visual Basic UserForm. Pre/post processing is done using macro-enabled Excel workbooks. ... -
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CalculiXforWin
Open-Source Multiphysics FEA (FEM) Package
...Good for structural, mechanical, thermal and fluid applications (trusses, plates, frames, shells, solid bodies). It has powerful nonlinear capabilities (including tension/compression only material like concrete) and most types of analysis (modal, thermal, buckling, coupled, etc) . See home page at http://www.dhondt.de New versions can be obtauned here: http://calculixforwin.blogspot.com/2015/05/calculix-launcher.html PS Appimages for Scilab, wxMaxima and GNU Octave were added -
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MYSTRAN
General Purpose Finite Element Structural Analysis Fortran Program
Files for end users are now controlled at http://www.mystran.com MYSTRAN is a general purpose finite element analysis computer program for structures that can be modeled as linear (i.e. displacements, forces and stresses proportional to applied load). MYSTRAN is an acronym for “My Structural Analysis”, to indicate it’s usefulness in solving a wide variety of finite element analysis problems on a personal computer. For anyone familiar with the popular NASTRAN computer program developed... -
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optpack
FE simulation based automatic global optimisation in modern Fortran
A collection of Fortran 2003, 90 and 77 routines, modules and programs for automatic simulation based global constrained optimisation. The initial application is for FE simulation of elasto-plastic buckling of steel rods aimed at tuning the hardening model. Unix shell scripts are used extensively. High concurrency is achieved with parallel multi-start global search and with parallel MPI FE. Powell's BOBYQA or LINCOA are used (not included in this package). Automatic mesh generation of 3D cylinders is provided + automatic boundary conditions, all via Fortran and shell scripting. -
8
Folder
Toolbox for modelling deformation in layered media in 2D
...It also includes a range of features that facilitate the visualization and examination of various relevant quantities e.g. velocities, stress, rate of deformation, pressure, and finite strain. Folder contains a separate application, which illustrates analytical solutions of growth rate spectra for buckling and necking of a single viscous layer. Check out the companion paper: doi:10.1016/j.jsg.2016.01.001 -
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Buckling in compression EC3
Programe to design coloumbs in commpression
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