Q1: Shafts must be design to withstand L Static loads IL Fatigue loads III. Both
ID: 1766991 • Letter: Q
Question
Q1: Shafts must be design to withstand L Static loads IL Fatigue loads III. Both static and fatigue loads 02: Ifshafts are to be made from steel materials, then preferably it should be L Cold Drawn (CD) I Hot Rolled (1IR) Q3: Shafts are usually designed to withstand L Bending moment, while torsional and axial load can be ignored Il. Bending and torsional loads, while axial loads can be ignored III. Torsional loads, while bending and axial load can be ignored IV. Axial loads, while bending and torsional load can be ignored V. Bending and axial loads, while torsional loads can be ignored Q4: write the expression for max in terms of a (alternating stress) and m (Midrange stress), where as 0min Time Q5: To safe design the shafts...... stress should be taken into account 11. m 111. nun Q6: If Von-Mises Criterion is used to calculate stresses, it will account for I. Fatigue loads Il. Static loads IlI. Both fatigue and static loadsExplanation / Answer
Q1) Both Static and Fatigue Loads(Option 3) is correct Answer
shaft is subjected to torsion, traverse or axial loads, acting in single or in combination. Generally shafts are not of uniform diameter but are stepped to provide shoulders for locating gears, pulleys and bearings. The stress on the shaft at a particular point varies with rotation of shaft there by introducing fatigue, so a shaft is designed based on both static and Fatigue loading.
Q2) Hot Rolled (Option 2 is correct)
Compared to its counterparts however, hot rolled steel has less strength than cold rolled steel. Hot rolled steel is allowed to cool at room temperature. This gives the finished product looser tolerances than the initial material used unlike cold rolled steel products.
Q3) Option 3 Torsionla Loads while Bending and Axial loads can be ignored.
Rotary shafts are elongated, rod-shaped devices that rotate about a longitudinal axis and transmit torque. They are similar in shape to linear shafts, but are designed to withstand torsional forces
Q4) Expression for max =a + m
where mean stress m = max + min /2
ALternating stress a= max - min /2
max = a + m
max = max + min /2 + max - min /2
max = 2max /2 = max
Q5) Mean Stress (Option 2)
The modifying endurance limit of the shaft is found using Modified Goodman equation by taking mean stress
Q6) Static Loads (Option 2)
static failure theories such as von Mises theory, which can be utilized to prevent failure in static loading applications such as the beams in bridges
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