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Loaded Horizontal Beam Experiment

Purpose:
Resisting shear stresses are developed on every section of a loaded horizontal beam where the vertical shear force has a numerical value other than zero.
Experiment process:
1. Cut 8 (eight) softwood/ hardwood strips of timber of the following sizes: b=40mm h=10mm l=600mm.
2. Position 4 (four) strips on the top of each other (without gluing or joining them) and create the simply supported beam shape-packet with cross section size 40×40 mm (see the drawing below).
3. Test the beam shape packet over 400 mm span to flexural failure and record all needed results.
4. Glue together other four strips using different two component epoxy resin glues and create the laminated solid (one piece beam) comprising of 4 strips and having a cross section of 40×40 mm.
5. Test this type of beam to flexural failure and record all needed results (e.g. ultimate force and mode of failure).
6. Calculate the shear stresses at the glue and centroids of the 4 planks.
7. Draw the shear stress distribution in the cross section.
8. Process all data and write a report about this project.
9. Make enough photos to support your project report and other findings.
10. Wear all necessary safety gear – especially when cutting/drilling the timber and working with epoxy resins / araldite.

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