An analysis of structural design in balsawood

However, testing procedure called for testing of the material in the greatest strength orientations; torsion and compression, parallel to the grain, and bending with the shear forces perpendicular to the grain. Further tests need to be performed using this test, on materials ranging from plywood style layered balsa, with similar grains, perpendicular grains, etc.

Sample specimens were broken in two, and then glued back together, see Figure 4. Joint Testing Results Joint Type Load Performance Results of Test 6-a good glue peeled off 6-b better reinforcement crushed 6-c best joint crushed The scarf joint held the most load, and therefore was rated as best.

The goal of this report is to combine the results from testing and experience to produce a working preliminary design. In general joint construction this should be kept in mind, while not all joints will occur at 90 degree angles, it should be noted that there was a definite relationship between surface area glued and strength of joint.

Since balsa, like most woods, is high in water content, and the goal of this project is to win a weight versus load carrying capacity competition, the effects of baking out some of the water were tested.

Figure 7 shows a basic design. Now to discuss the initial design. The data obtained form this test can be used in design of the top beam in the final design. The finger joint is likely to have failed because it has the most area under shear force and as stated earlier, glue is weaker in shear than in normal stress.

The information gained from this report will be used in the construction of the structure. Balsawood Structure Design 1.

This report generally functions as a guide for the construction stage of the project. Testing the materials for their "best direction" characteristics can produce results that are not representative of real behavior.

See the design concepts section for more discussion of moisture content in the specimens. Design Concept Among issues not previously discussed in this report is the effect of baking the structure. However this test yields comparative results for each glue and has an obvious best solution.

It is assumed that the results would be similar for testing in shear. Wood grain is composed of bundles of thin tubular components or fibers which are naturally formed together.

Apparently balsa can withstand approximately 3 times more load under tension than under compression. This part of the structure will undergo a similar bending due to the load from the loading cap.

The so called, 3M Super Strength Adhesive proved to give the worst results, and gave off a noxious smell both in application and in failure.

This occurs when the yield strength is reached and plastic behavior starts. Failure was determined to occur when the joint either snapped or would not hold any more load.

Its role is to provide useful information and a basis for the final design. In the actual design, the glue will mostly be under shear, notably when used to ply several layers of wood together.

Discussed in the design section are special self forming joints that occur only under load, these special type of joints should be kept in mind for the design as well.

Often a vertical piece of balsa would bite in to a horizontal piece, thus creating a strong joint that was better than most glued joints simply because the material had compressed to form a sort of socket for the joint.The Bridge Design Project helps you learn the principles of structural analysis using SolidWorks and SolidWorks Simulation as an integral part of a creative and iterative design process.

For this project, You will “learn by doing” as you complete a structural analysis. What is SolidWorks Software? SolidWorks is design automation software. High School STRUCTURAL DESIGN AND ENGINEERING PROBLEM STATEMENT Through structural analysis (a key component in the structural design and engineering process), engineers The 1/32" balsa wood sheets are to be used for the construction of the carrier/gantry sleeve structure 6.

The field of structural engineering deals with the analysis and design of structures that support Structural analysis serves as a key component in the structural design and engineering process. Balsa wood is the designated construction material; you may choose your own glue type.

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Results and discussion.

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An analysis of structural design in balsawood
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