On 11/7/2021 7:49 AM, Mark Wegmet wrote:
Another way of looking at "torque" requirements at the basic
engineering level of fasteners is to consider that it is a conversion
of (unmeasurable) clamping force on a fastener to a (measurable)
rotational force that considers the tensile strength and elongation
under load of a material (i.e., how much force is required for a given
amount of "stretch" in a material, in this case steel) which can be
converted to a specific (relatively) amount of clamping force on a
joined set of devices. Tensile strength vs. elongation under load is
representative of the clamp force applied to the joint.
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In my non-engineering understanding of "torque / stretching" a bolt is
to stretch the bolt to a greater length (we're talking thousands of an
inch) than it will see in service so that it is not subject to "stress
cycles" in use that will fatigue the bolt and lead to failure. As all
the bolts in the WAFs are subject to shear forces and not tension it
seems torque values are irrelevant except as to not crushing the wood.
Is that what you were saying?
Larry Flesner
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