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SJ MEPLA
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SJ MEPLA is a program for design and statics of multi layered sandwich plates.
Especially for the glass engineering practice new approaches for considering laminated glass, insulating glass units, point fixings and for simulating dynamic impact tests on glass panels are included.
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 Design and statics of sandwich plates (laminated glass panels) under various loads is a standard task in the engineering practice. Glass panels varying from a rectangular form can no more be calculated by table works or manual formula but have to be evaluated by the method of the finite elements.
In the field of glass design the formats are very similar, so that the mesh generation is almost always limited to standard geometries, for which always new meshes have to be created. For the calculation of laminated safety glass panels generally there was need to work with volume elements.
Also the evaluation of the calculation results follows the same pattern (deformations, stresses, proof) and so far always explicitly has to be read out of the finite element data.
There is hardly a possibility to calculate insulating glass units (from 2, 3 or 4 laminated glass panels) if any panel formats shall be examined or geometrically non-linear approaches shall be used.
Here is where SJ MEPLA applies:
All inputs, like the geometry, the boundary conditions, the kind of loading, the calculation approach or the requested output, are guided and displayed by input masks. The control and output of the results occurs visually on a graphics surface and a calculation protocol which can be used for the static assessment.
Special new Finite element methods allow the simple input and quick calculation of sandwich plates (e.g. laminated glass), so that the entire problem can be solved at shortest time (within a few minutes). Therefore the program may be used for assessment purposes as well as for dimensioning the glass plates.
Thus the program is suited for dimensioning as well as for assessment purposes, by use of various calculation possibilities:
- Automated mesh generation for the general basic forms
* circular disks
* triangles
* squares
* pentagons
* sexangles
* squares with curved edges
* by the input of corner points.
- The density of the element mesh is preset, but can also be selected manually to increase the accuracy of the calculation. (The user, however, is not aware of the fact that he is working with a Finite Element Program).
- All subsequent calculations can be made linear or non-linear (large deformations).
- Any sandwich structure (e.g. of laminated safety glass) considering the stiffness of the compound material only by defining the thickness and the order of layers.
- Several support conditions:
* Springs in any direction
* Pre-defined edge supports
* Elastic edge- and line supports (anywhere within the pane)
* Elastic base
* Reinforcing edge beams
* Spacers within insulation glass units
* Point fixings
- Automatic generation and insertion of point fixings:
* Definition only through co-ordinates of position
* Countersunk- and double-sided disk fixing (own elements) with the stiffness of the separating disk layer and the bush by means of elasticity-module and thickness specification
* Specification of the bearing stiffness (sub-construction, type of point fixing e.g. ball shaped head)
* The properties of the point fixings can be stored in a database
* As well for insulation glass units!
- Several load conditions:
* Face loads
* Dead weight (in any direction)
* Concentrated loads, which will be distributed over a given area (line loads, point loads)
* Climatic loads
* Temperature loads within the panes
* Impacting body
* All loads can be combined
- Calculation of insulated glass units:
* Considering the Boyle?s law in the intermediate pane space
* Any load combination (barometric pressure differences, temperature expansion, outside pressure loads, impacting bodies, concentrated loads ?)
* Until fourfold glazing
* Non-linear behaviour for the spacer can be set
- Most supports can be calculated including contact conditions (point fixings, elastic line supports with lifting corners, elastic base, ...)
- Dynamic calculation of impacting pendulum body according DIN EN 12600
* For any system and layer structure
* The drop height and impact position can freely be chosen
- Pressure hits (wind- and detonation blasts,...)
- Calculation protocol of all input and outputs
- Curve diagram of force, displacement and stress distribution during impact for each pre-defined positions
- Manifold evaluation possibilities within the graphics surface:
* Stresses across the plate thickness and layer order at any point
* Display of the pendulum impact in slow-motion
* Output of all stress components
* Display of the spring forces
* Vector-plot of the principal stresses
* Coloured displacements
- Multilanguage program
* German
* English
* French
- Handbooks in
* German
* English
- Free of charge for a 14 days test phase incl. own calculations
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