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s toward the endce of understand-zed. An automeshntinv of even thenost efficient andrblem. Take eachL Learn to recog-rg and do not bevour solution andeglect be the rea-NL Boumd

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In FEA, the name of the game is "boundary conditions," tLtat is, calculat-ing the loads and constraints that each component or system of compo-nents experiences in its working environment. In other words, boundaryconditions are those conditions that you must place on a model to repre-

sent everything about the system that you have not modeled.

For example, consider a motorcycle wheel. You may have the mostsophisticated FEM of this component. You can shade it, rotate it on thescreen, and impress the world with the images your workstation pro-vides. Then you can grab an area at the bottom of the rim and applysome "intuitive" loads while constraining the hub. Press a button andshow your audience the beautiful stress-contour images that result fromthe FEA thatjust ran in the background. You are now dubbed an engi-neer. \Arhat is the problem with this scenario? The flashiness of today'stechnology can be mesmerizing. It can be very useful as much as it canbe misleading. How did you obtain the loads? Did you consider thetire/wheel interface? Did you treat the tire as a simple constraint onvehicle motion rather than a force and moment producer at its contactpatch? Did you fully constrain the hub or accommodate for the load

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