BMW K bikes (Bricks)

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1Back to top Go down    Frame Stress Tolerance Measurements on Sun Jan 28, 2018 6:41 am

DBRMN

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I was just wondering if someone could point me in the direction of finding out what the maximum stress the frame can handle before it breaks, as BMW surely must have tested this its just whether its public information.

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DBRMN

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2Back to top Go down    Re: Frame Stress Tolerance Measurements on Sun Jan 28, 2018 12:06 pm

Point-Seven-five

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I have no documentation data, but can conclusively say that a K100RS frame deforms when hit from behind by a 2800 pound vehicle travelling 75 MPH.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down    Re: Frame Stress Tolerance Measurements on Sun Jan 28, 2018 1:15 pm

robmack

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I'd venture to guess that you're probably not going to readily find that information, especially in a easily-digested format for the layman. There are many stresses placed upon the frame, from many directions both statically and dynamically. The steel chosen for the frame will elastically deform, then plastically deform before is cracks or breaks (which I guess is the numbers you are seeking). I can imagine that BMW used FEA software like CAEDS (in the day) or Nastran or Abaqus to design these frames and they are not about to release the models into the public domain.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
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4Back to top Go down    Re: Frame Stress Tolerance Measurements on Sun Jan 28, 2018 1:52 pm

DBRMN

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@Point-Seven-five wrote:I have no documentation data, but can conclusively say that a K100RS frame deforms when hit from behind by a 2800 pound vehicle travelling 75 MPH.
OMG what happened are you alright? such a sad sight.

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5Back to top Go down    Re: Frame Stress Tolerance Measurements on Sun Jan 28, 2018 1:54 pm

DBRMN

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@robmack wrote:I'd venture to guess that you're probably not going to readily find that information, especially in a easily-digested format for the layman. There are many stresses placed upon the frame, from many directions both statically and dynamically. The steel chosen for the frame will elastically deform, then plastically deform before is cracks or breaks (which I guess is the numbers you are seeking). I can imagine that BMW used FEA software like CAEDS (in the day) or Nastran or Abaqus to design these frames and they are not about to release the models into the public domain.

Is there anyway to find out what sort of steel they used at its elastic properties? Just want to know how far off its elastic limit it is. Ye thats fair enough something tells me its an impossible ask.

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