- #1
boblefisk
- 4
- 0
Hi.
me and my friend have a problem that we can't really agree upon.
we are doing an analysis study on a bike's crank and pedal.
the first picture shows how we put the force of 210 N.
picture 2 shows how we used "fixed geometry" to lock the part in place.
now, this is the static analyses, where we get a stress consentration of 121.3 MPa in the pin connecting the crank and the pedal.
our unagreement comes here:
she belives that the stress consentration in the same spot in a dynamic "real" event could be reduced.
because instead of the part beeing fixed and locked where the gear is, it would rater have a force working against the pedal force.
i believe the stresses in the pin would be the same nomatter if its static or dynamic in that excact position. The force used on the pedal will still be 210 N and therefor the max stress in that area would remain the same.
i can't imagine how the stresses at that location can be reduced due to the change from static to dynamic, when all paramters are the same except for resitance insted of it beeing locked.
(im know the stresses would change due to the change in position in dynamic, but that isn't what we are asking for)
im not sure if i made my self understandable here. please ask if anything is unclare:)
me and my friend have a problem that we can't really agree upon.
we are doing an analysis study on a bike's crank and pedal.
the first picture shows how we put the force of 210 N.
picture 2 shows how we used "fixed geometry" to lock the part in place.
now, this is the static analyses, where we get a stress consentration of 121.3 MPa in the pin connecting the crank and the pedal.
our unagreement comes here:
she belives that the stress consentration in the same spot in a dynamic "real" event could be reduced.
because instead of the part beeing fixed and locked where the gear is, it would rater have a force working against the pedal force.
i believe the stresses in the pin would be the same nomatter if its static or dynamic in that excact position. The force used on the pedal will still be 210 N and therefor the max stress in that area would remain the same.
i can't imagine how the stresses at that location can be reduced due to the change from static to dynamic, when all paramters are the same except for resitance insted of it beeing locked.
(im know the stresses would change due to the change in position in dynamic, but that isn't what we are asking for)
im not sure if i made my self understandable here. please ask if anything is unclare:)