Acrylic Panel Thickness

Acrylic windows under hydrostatic pressure, e.g. aquarium panels, have to retain the massive water load of the water column in the tanks. In public and private tanks the safety of the viewer but also of the marine life should be considered as vital. The design engineer therefore has to limit the material’s tension and the maximal deflection of the window in order to maintain safety regulations.

The choice of material thickness or the definition of the permissible water pressure is based on theoretical calculations and confirmed by practical tests. Our calculation of the required sheet thickness under hydrostatic pressure (according to Girkmann / Czerny) allows evaluation according to the maximum material stress and maximum deflection.

The basis for this calculation are:
elastic modulus = 3300 MPa
Poisson’s ratio mb = 0.37
safety stress permiss. water side = 3 MPa
safety stress permiss. air side = 5 MPa

Detailed calculations by a structural engineer are required to precisely determine the actual material stress at a given location. The joints bonded call for special certification. In this case, the maximum safety stress should be less than or equal to 3 MPa. Typical Aquarium walls are between 30mm and 300mm (about 1” and 1′) thick.

Feel free to send us your preferred shape, width, height and water height over panel bottom, and we will provide you with possible dimensions. Projects, that Hydrosight is directly involved in, are free of charge.

big_block_optimized.psdIMG_5346

Categories: Technology of Glazing under Pressure
Created: 22 March 2013
Last Modified: 14 August 2013

Related Posts

Shapes of Aquarium Tunnels
Cylindrical Aquarium Tunnel Tunnels are typically cylindrical in design. The most common t...
A comparision of waterproofing slurries
Waterproofing slurries are applied directly onto the concrete This is where we used Ardex S7...
Acrylic vs. Polycarbonate: a Quantitative and Qualitative Comparison
Acrylic often compared to Polycarbonate, which is an other transparent plastic, that is som...
Why not to use Glass for Underwater Windows
The picture shows the two best reasons why not to use float glass for underwater windows: ...
Optical Performance Requirements for Acrylic Windows
Typical optical quality in spherical sector windows. Curtesy of J.Stachiw – not our work ...
Thermoforming Acrylic Panels
example for thermoforming spherical sector windows in aluminum molds “Many of the sp...

Hydrosight Underwater Windows