- #1

ShearStress

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Assuming the washer is always covered by the bolt head so it's getting a consistent load, does the washer's diameter impact the static friction being imparted on the surface?

I see two conflicting ways of viewing this:

1.) Friction doesn't care about surface area, so no the washer diameter doesn't matter (perhaps this is more relevant for linear friction, not rotational?)

2.) The larger the washer is, the higher the moment is since the friction is acting further from the axis of rotation

What's the answer and how can this solution be expressed mathematically?