What design considerations are important in applications inv

What design considerations are important in applications involving shock and impact loading?

Solution

>> Required Design Considerations are :

The chief problem usually involves estimation of deformability. The assumption of a rigid impact is generally useless, since rigidity implies an instantaneous velocity change, therefore infinite acceleration and an infinite force. In real structures the deceleration is limited by elastic and plastic deformation, which in effect cushions the blow, and a major ‘trick’ is making a reasonable estimate the local compliance or stiffness at the point of impact. Where impact is a routine service condition, the structure should remain elastic or nearly so and a true dynamic analysis may be required. In many structural or mechanical design problems the requirement is to provide proof that the structure remain substantially intact, even though damaged. Local plastic deformation may be tolerated, provided the overall response is nearly elastic. The St Venant effect allows the local effects to be considered separately as a first approximation. Approaches based on energy equivalence are useful in both elastic and plastic behavior.