I apologize for deviating off into advanced engine tech but I think it is important. When I went to technical school they expected you to know the science and mathematics (at least conceptually) of the trade you were practicing. Ferris State had an engineering program and also trained automotive technicians. I know many of the students I met went straight to work for the Big Three at the time.
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Dave Koehler wrote: ↑Tue Apr 30, 2019 11:26 am
Kevin Johnson wrote: ↑Tue Apr 30, 2019 10:28 am
Thank heaven there is no need to appeal to Harry Potter when Newtonian physics and Occams razor provides a reasonable explanation.
Deflect all you want Kevin and refer to all your professors but my post stands.
It says NOTHING about the bearing shell becoming thicker.
I will try again using online educational materials and a symposium paper presented specifically on the topic of bearing crush.
First, there is a difference between elastic deformation and plastic deformation. I think you have the idea of plastic deformation in mind.
https://www.nde-ed.org/EducationResources/CommunityCollege/Materials/Structure/deformation.htm wrote:Elastic/Plastic Deformation
When a sufficient load is applied to a metal or other structural material, it will cause the material to change shape. This change in shape is called deformation. A temporary shape change that is self-reversing after the force is removed, so that the object returns to its original shape, is called elastic deformation. In other words, elastic deformation is a change in shape of a material at low stress that is recoverable after the stress is removed. This type of deformation involves stretching of the bonds, but the atoms do not slip past each other.
When the stress is sufficient to permanently deform the metal, it is called plastic deformation.
The paper I am citing below uses the term "deformation" five times. It also specifically uses the terms "elastic deformation" and "plastic deformation." I cite papers assuming that the reader will actually read the paper. The paper is full-text without a paywall.
http://web.posfemec.org/posmec/14/TRB/TRB1446.pdf
The picture below shows the
radial displacement with and without bore relief. Radial displacement is another way to present the varying thickness of the bearing shell.
Bore relief.jpg
The picture below illustrates radial displacement with and without the assumption of a perfectly rigid housing/bore:
Distribution of radial displacement due to the bearing crush.jpg
I think the paper is fairly self explanatory and certainly has many references if you want to explore the topic. If you are not used to reading academic papers you just need to take your time. There are many college level online educational references available free-of-charge.