﻿GET_GEVOMechL2_01_01_01_09 - ANIMATION Screen
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Joints are loaded with shear force (Fs), tension force (Ft), or a combination of both.

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In a joint loaded with tension forces, the preload force on the bolt opposes the joint-separating forces.

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A cylinder head is a good example of this.

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For a joint with stiff mating parts, the load on the bolt remains constant at Fp until the tensile load is greater than the preload force.

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A simplistic view is that the ultimate strength of the joint is limited by the strength of the bolt.

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However, the higher the preload force, the better the joint, because it prevents the assembled parts from moving and the joint from loosening.

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A highly preloaded joint is also more resistant to cycling loads because less of the cyclic portion of the load is experienced by the fastener.
