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Strength And Stiffness
9.3.1 Explain the relationship between deflection and stiffness in structures.
If an external load is applied to some part of a structure, that part will be deflected to an extent that depends on the size of the load and the stiffness of the structure.
9.3.2 Calculate the stiffness of a structure.
9.3.3 Outline what is meant by bending moment in relation to structures.
This is the moment that a beam has to resist in bending at a particular section.
Society of robots website has a simple explanation.
9.3.4 Outline what is meant by moment arm.
The load × distance from the pivot is called the moment about the pivot. The distance between the load and the pivot is called the moment arm.
9.3.5 Explain the need for a factor of safety in structural design.
Structures are designed to take higher loads than those they are normally expected to support.
9.3.6 Calculate the factor of safety for a structure.
Factor of safety = design load/normal maximum load
9.3.7 Apply the concept of factor of safety to other areas of design.
A factor of safety is simply the ratio of the quantitative value of a design (factor) divided by the normal maximum expected value.
9.3.8 Evaluate the importance of strength and stiffness in a design context.
Bulleted list and italicised paragraphs are excerpted from Design Technology: guide. Cardiff Wales, UK: International Baccalaureate Organization, 2007.
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