Author Question: Explain plastic deformation in terms of molecular chains. What will be an ideal ... (Read 77 times)

corkyiscool3328 · **on:** Aug 19, 2018

Explain plastic deformation in terms of molecular chains.

What will be an ideal response?

Question 2

Explain staking, and explain the effect of its use with large-diameter posts in large-diameter holes.

What will be an ideal response?

ebonylittles · **Reply #1 on:** Aug 19, 2018

Answer to Question 1

Plastic deformation occurs when the molecular chains move relative to each other in a nonrecoverable way. In other words, the changes in shape are permanent because the sliding of the molecules has used up some energy and not enough energy remains to force the molecules into their original positions.

Answer to Question 2

Staking is used to attach a post inside a hole. It is done by heating the top of the post, often using ultrasonics, and then pressing the softened end of the post so that it spreads out and overlaps the part surrounding the post. On very large parts, the end of the entire post may be difficult to soften all at the same time, thus making staking difficult.