Jump to content
Mechanical Engineering
Amil

Will a chassis crack if i don’t use the car?

Recommended Posts

Speaking of cars, in particular of the chassis, if we keep a car stopped for years, will the weight of the engine and all the components form cracks in the crystalline microstructure of the iron?

if we think about a spring, if we leave it compressed for so long it will lose its ability to flex, it will not come back as before (i guess), isn't it the same for a frame that has to hold up an engine for years?  perhaps there is a load limit below which the piece will return as before also being compressed for many years?  What happens to the metal microstructure in these cases?  Correct me if I'm wrong. 

if the weight of the motor has been designed to keep the deformation of the underlying frame always in the "elastic" and not "plastic" area, how can it damage the metal in the absence of external environmental attacks?

thanks

 

 

Share this post


Link to post
Share on other sites

Crack will not happen because it is ideal condition for chassis with respect to stress strain diagram. the material corrosion is other topic for debate. No deformation and crack generated at ideal condition because as per stress strain diagram material do not react at the point of maximum stress point.

Share this post


Link to post
Share on other sites

Thanks for the answer, i have another questions please, about stress relaxation and  fatigue limit: 

What about stress relaxation? Is also an ambient temperature phenomenon that can affect a car chassis or is nothing like that?

from what I've read, there is a stress value  below which the steel does not record damage and can therefore be folded indefinitly.  from some tests performed with modern test machines that are able to overcome the "old" cycle threshold it has been discovered that in reality the fatigue limit does not exist,  exceeded a certain number of cycles the piece will begin to have fractures even if it has always  worked below the fatigue limit.  What do you think about it?  Does this fatigue limit for steel exist or not?

 

thanks

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...