The Stress Concentration Risks Associated With A Poorly Cut Keyway Hole 21 Jnury 2016 Luntic Lbortories
The purpose of the present paper is therefore twofold Parallel key and keyway sizes and tolerances is provided. First find stress concentration by using fe analysis of existing standard designs, and second improve/optimize the keyway design by lowering the stress concentration
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The keyway related stress is indeed fully three dimensional as also stated in peterson [18]. This shafting is true and straight and needs no turning, but if keyways are cut in the shaft, it must usually be straightened afterwards, as the cutting of the keyways relieves the tension on the surface of the shaft. To accommodate the key into the shaft a slot is cut into the shaft which is known as the keyway
In the field of design n l pedersen [1] work on effect of stress concentration and optimization of keyway design using numerical finite element analysis for the prediction of stress concentration in the keyway.
The story of the analysis of stress concentrations begins in 1898 with ernst gustav kirsch's linear elastic solution for stresses around a hole in an infinite plate [1] But there is more to the story The stress concentration can in fact vary from two to four for more complex. The stresses in keyways are examined under most.
More recently, pedersen (derivation 12) published details of using a numerical finite element analysis (fea) to determine the stress concentration factors in keyways and ways to optimi se keyway design Sketch 1.1 the general aspects of common keys and keyway designs such as end m illed and sled runner are presented in section 2. Engineering information on stress concentration factorsstress concentration factor for keyways note Values below are k f not k t keyways cut into a shaft reduce its normal torque carrying capacity.it is accepted that for a standard keyway (width approx 25% dia and depth approx 12.5% dia) the design load carrying capacity is reduced to 75% of the normal working strength
4 the figures are for half the shaft shown in fig
2 and show the stress concentration as a function of the arc length (a) the stress concentration factor along the keyway boundary starting from the external point until the centre point (b) stress concentration close up, here only shown along the r5 0.6 mm fillet at the corner The maximum value is kt 5 2.93
With a fillet radius of 0.4. A central circular hole in a plate loaded through a pin in hole, j We would like to show you a description here but the site won't allow us. Check out the lock keyway types (best, schlage, etc.) and designs, the difference between schlage and kwikset, as well as what is a keyway.
I ask because the stress concentration is more of a concern in cyclic loading, so i imagine a constant torsion doesn't really impact the life of the shaft
Furthermore, in reversed bending the peak stress will be at the end of the keyway whereas the peak torsion is along the side of the keyway. As the radius of curvature approaches zero, the maximum stress approaches infinity. Stress concentration and stress concentration factors grooves, fillets, holes, or other abrupt changes in cross section or any disruption of a smooth surface causes increased stresses around these areas Notch is a general term meaning any or all of the above.
The connection fatigue strength is improved if the stress concentration is reduced Important here is both the key shape and also the tolerances between key and keyway. Learn everything about keyway dimensions, types, tolerances, design, and how to calculate keyway depth and width with formulas and standard keyway size charts for accurate mechanical design. Stress concentration refers to the accumulation of stress in specific regions of a material or structure due to the presence of geometric irregularities,
Shaft keyway shear and yield strength requirement
Design tip for shaft and keyways
