Torque Pivot Point . The pivot point is at o. And different torque magnitudes will produce different rotational behaviors. Solved Exploration 2 Torque For An Object Free To Rotate from www.chegg.com Conversely, the less force applied, the less the torque will be. A uniform log that’s a hundred feet long seems pretty unlikely in the wilderness!. Figure 10.31 torque is the turning or twisting effectiveness of a force, illustrated here for door rotation on its hinges (as viewed from overhead).
Torque To Yield Method. The theory holds that the farther we stretch a fastener toward the threshold of yield, the more load it exerts on the joint. This method is called tension to yield.
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(tty) this method uses a low torque application to establish an equal snug torque position. Torque to yield fasteners are stretched to the point that they are, just about to “yield” or lose their springiness. This torque is called the snug torque and its purpose is to pull (or ‘snug’) the plates of the joint into metal to metal contact.
Tty Fasteners Are Designed To Stretch To A Certain Yield Point And Not Exceed This Clamp Load Limit.
To do this consistently requires special equipment that monitors the tightening process. Head bolts were the first fasteners affected, although the technology has trickled down to other critical fasteners. Especially on engines with aluminum heads and or in conjunction with (mls) head gaskets.
What About, Torque To Yield (Tty) Bolts ?
One corotates with the shank; Torque plus angle is not the same as torque to yield !!!! A torque to yield indicator and method.
Torquing A Fastener To Its Yield Point Results In A High Preloading Of The Fastener Which, Depending On The Load Frequency And Amplitude, Can Significantly Increase The Fatigue Life Of The Fastener.
An indicator and dial members are coaxially mounted relative to the shank of a torque wrench. Getting to the precise yield zone (for maximum clamping force) is accomplished by tightening bolts to a specific torque spec, and then turning the bolts an additional number of degrees. Torque to yield is the method of tightening a fastener so that a high preload is achieved by tightening up the yield point of the fastener material.
A Fastener With A Torque Specification Can Be Tightened With A Conventional Torque Wrench.
To achieve this the tty head bolts are tightened past their yield point into the plastic phase. A fastener with a torque specification can be tightened with a conventional torque wrench. Generally, externally threaded fasteners (bolts, screws, studs) tightened to this specification method can be reused unless otherwise specified in the service information.
The Theory Holds That The Farther We Stretch A Fastener Toward The Threshold Of Yield, The More Load It Exerts On The Joint.
Note however that whatever method is used to tighten a bolt, a degree of bolt preload scatter is to be expected. When tightened, they stretch to the point of yield. Torque plus angle, is not the same as, torque to yield (tty) !!
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