analyse brake disc with brake pad friction as "restraint"

[321GO]

Hello guys,
i want to analyse a brakedisc loaded with brake torgue, using the actual pad contact area as the "restraint".
Do you agree this is a decent approach?

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setup:
- wheel bearing
- brakedisc bounded to wheelbearing
- wheel hub bounded to brakedisc
- brakepads on both sides of disc
- piston on backside of each pad
(brakedisc is sandwitched between bearing and hub)

restraints:
- wheelbearing surface free to rotate, no translation
- brakepads free to translate in one direction, fixed in remaining directions(floating caliper)

loads:
- force on pistons
- torgue on circumference of wheelhub(via the wheelrim)

p.s. where appropriate friction is implemented
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Thank you all for your help,
greatly appreciated.

 

[GregLocock]

Yes, that sounds about right. Have you got a measurement for the E of the pads? They should deflect significantly at a typical brake force.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[321GO]

Greg,

i researched certain SAE reports for these value's, as a guideline.

To simulate a semi-metallic pad, i used an E 1/10 and a G 1/8 compaired to steel. To simplify somewhat i assumed the pad material to be isotrophic(which it's not).

I did a quick displacement study and simply loaded one pad with the piston forces. The pad compressed approx. 3/100 mm at piston location(@ max. brake pressure).


To Greg or others,

do you think the isotrophic assumption for the pad material is ok?


to Greg, thanks!