Preventing stress concentrations.

High local stresses can cause objects to fail more quickly, so engineers must design the geometry to minimize the stress concentrations. Propose the alternative preventive actions to eliminate or minimise the stress concentration.

Answer

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• Drill a large hole at the end of the crack. This is however, a temporary solution that must be corrected at the first opportune time.

• Systematically check for possible stress concentrations caused by cracks

• Apply a metal stitch to lock the crack or metal paste technology

• Creating the fillet at the sharp edges.

• Providing a fillet radius so that the cross-section may change gradually

• Using an elliptical fillet

• Using a number of small notches rather than a long one, if a notch is unavoidable

• Using narrow notches rather than wide notches, if a projection is unavoidable

• Using stress-relieving grooves