Mechanics Of Materials, Si Edition
9th Edition
ISBN: 9789810694364
Author: Russell C Hibbeler
Publisher: Pearson Education
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Textbook Question
Chapter 9.3, Problem 9.23P
The wood beam is subjected to a load of 12 kN. If grains of wood in the beam at point A make an angle of 25° with the horizontal as shown, determine the normal and shear stress that act perpendicular to the grains due to the loading.
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Students have asked these similar questions
The gears shown in the figure have a diametral pitch of 2 teeth per inch and a 20° pressure angle.
The pinion rotates at 1800 rev/min clockwise and transmits 200 hp through the idler pair to gear
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TS
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Question 1. Draw 3 teeth for the following pinion and gear respectively. The teeth
should be drawn near the pressure line so that the teeth from the pinion should
mesh those of the gear. Drawing scale (1:1). Either a precise hand drawing or
CAD drawing is acceptable. Draw all the trajectories of the involute lines and the
circles.
Specification: 18tooth pinion and 30tooth gear. Diameter pitch=P=6 teeth /inch.
Pressure angle:20°, 1/P for addendum (a) and 1.25/P for dedendum (b). For fillet,
c=b-a.
5. The figure shows a gear train. There is no friction at the bearings except for the gear tooth forces.
The material of the milled gears is steel having a Brinell hardness of 170. The input shaft speed (n2)
is 800 rpm. The face width and the contact angle for all gears are 1 in and 20° respectively. In this
gear set, the endurance limit (Se) is 15 kpsi and nd (design factor) is 2.
(a) Find the revolution speed of gear 5.
(b) Determine whether each gear satisfies the design factor of 2.0 for bending fatigue.
(c) Determine whether each gear satisfies the design factor of 2.0 for surface fatigue (contact stress).
(d) According to the computation results of the questions (b) and (c), explain the possible failure
mechanisms for each gear.
N4=28
800rpm
N₁=43
N5=34
N₂=14
P(diameteral pitch)=8 for all gears
Coupled to 2.5hp motor
Chapter 9 Solutions
Mechanics Of Materials, Si Edition
Ch. 9.3 - In each case, the state of stress x, y, xy...Ch. 9.3 - Given the state of stress shown on the element,...Ch. 9.3 - Determine the normal stress and shear stress...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - Also, find the corresponding orientation of the...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - Determine the maximum principal stress at point B.Ch. 9.3 - Determine the principal stress at point C.Ch. 9.3 - Prove that the sum of the normal stresses x + y =...Ch. 9.3 - 9-2. The state of stress at a point in a member is...
Ch. 9.3 - Determine the stress components acting on the...Ch. 9.3 - Determine the normal stress and shear stress...Ch. 9.3 - Determine the normal stress and shear stress...Ch. 9.3 - 9-6. Determine the normal stress and shear stress...Ch. 9.3 - 9-7. Determine the normal stress and shear stress...Ch. 9.3 - *9-8. Determine the equivalent state of stress on...Ch. 9.3 - 9-9. Determine the equivalent state of stress on...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - Determine the equivalent slate of stress on an...Ch. 9.3 - *9-12. Determine the equivalent state of stress on...Ch. 9.3 - 9-13. Determine the equivalent state of stress on...Ch. 9.3 - 9-14. The state of stress at a point is shown on...Ch. 9.3 - The state of stress at a point is shown on the...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - A point on a thin plate is subjected to the two...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - *9-20. Planes AB and BC at a point are subjected...Ch. 9.3 - The stress acting on two planes at a point is...Ch. 9.3 - The grains of wood in the board make an angle of...Ch. 9.3 - The wood beam is subjected to a load of 12 kN. If...Ch. 9.3 - *9-24. The wood beam is subjected to a load of 12...Ch. 9.3 - 9-25. The wooden block will fail if the shear...Ch. 9.3 - 9-26. The bracket is subjected to the force of 3...Ch. 9.3 - 9-27. The bracket is subjected to the force of 3...Ch. 9.3 - 9-28. The 25-mm thick rectangular bar is subjected...Ch. 9.3 - 9-29. The 3-in. diameter shaft is supported by a...Ch. 9.3 - 9-30. The state of stress at a point in a member...Ch. 9.3 - 9-31. Determine the principal stress at point A on...Ch. 9.3 - 9-32. Determine the maximum in-plane shear stress...Ch. 9.3 - 9-33. The clamp bears down on the smooth surface...Ch. 9.3 - 9-34. Determine the principal stress and the...Ch. 9.3 - 9-35. The square steel plate has a thickness of 10...Ch. 9.3 - *9-36. The square steel plate has a thickness of...Ch. 9.3 - The shaft has a diameter d and is subjected to the...Ch. 9.3 - Prob. 9.38PCh. 9.3 - Prob. 9.39PCh. 9.3 - The wide-flange beam is subjected to the 50-kN...Ch. 9.3 - Solve Pro b. 9-40 for point B located on the web...Ch. 9.3 - Prob. 9.42PCh. 9.3 - Prob. 9.43PCh. 9.4 - Use Mohrs circle to determine the normal stress...Ch. 9.4 - Also, find the corresponding orientation of the...Ch. 9.4 - Draw Mohrs circle and determine the principal...Ch. 9.4 - Determine the principal stresses at a point on the...Ch. 9.4 - Determine the principal stresses at point A on the...Ch. 9.4 - Point A is just below the flange.Ch. 9.4 - Solve Prob.93 using Mohrs circle. 93. Determine...Ch. 9.4 - 9-45. Solve Prob. 9-6 using Mohr’s circle.
9-6....Ch. 9.4 - 9-46. Solve Prob. 9-14 using Mohr’s circle.
9-14....Ch. 9.4 - Solve Prob.911 using Mohrs circle. 911. Determine...Ch. 9.4 - *9-48. Solve Prob. 9-12 using Mohr’s...Ch. 9.4 - Solve Prob.916 using Mohrs circle. 916. Determine...Ch. 9.4 - Mohrs circle for the state of stress is shown in...Ch. 9.4 - Prob. 9.51PCh. 9.4 - Prob. 9.52PCh. 9.4 - 9-53. Determine the equivalent state of stress if...Ch. 9.4 - Prob. 9.54PCh. 9.4 - Prob. 9.55PCh. 9.4 - Prob. 9.56PCh. 9.4 - Determine (a) the principal stresses and (b) the...Ch. 9.4 - 9-58. Determine the equivalent state of stress if...Ch. 9.4 - Prob. 9.59PCh. 9.4 - Prob. 9.60PCh. 9.4 - 9-61. Draw Mohr’s circle that describes each of...Ch. 9.4 - The grains of wood in the board make an angle of...Ch. 9.4 - The post is fixed supported at its base and a...Ch. 9.4 - Determine the principal stresses, the maximum...Ch. 9.4 - The thin-walled pipe has an inner diameter of 0.5...Ch. 9.4 - 9-66. Determine the principal stress and maximum...Ch. 9.4 - Prob. 9.67PCh. 9.4 - The rotor shaft of the helicopter is subjected to...Ch. 9.4 - The pedal crank for a bicycle has the cross...Ch. 9.4 - A spherical pressure vessel has an inner radius of...Ch. 9.4 - The cylindrical pressure vessel has an inner...Ch. 9.4 - Determine the normal and shear stresses at point D...Ch. 9.4 - Determine the principal stress at point D, Which...Ch. 9.4 - If the box wrench is subjected to the 50 lb force,...Ch. 9.4 - If the box wrench is subjected to the 50-lb force,...Ch. 9.4 - Prob. 9.76PCh. 9.5 - Draw the three Mohrs circles that describe each of...Ch. 9.5 - Draw the three Mohrs circles that describe the...Ch. 9.5 - 9-79. The stress at a point is shown on the...Ch. 9.5 - Determine the principal stresses and the absolute...Ch. 9.5 - 9-81. The stress at a point is shown on the...Ch. 9.5 - Determine the principal stresses and the absolute...Ch. 9.5 - Determine the principal stresses and the absolute...Ch. 9.5 - Prob. 9.85PCh. 9.5 - Prob. 9.86PCh. 9.5 - 9-87. Determine the principal stresses and...Ch. 9.5 - *9.88. Determine the principal stresses and...Ch. 9 - Prob. 9.89RPCh. 9 - Prob. 9.90RPCh. 9 - Prob. 9.91RPCh. 9 - The steel pipe has an inner diameter of 2.75 in....Ch. 9 - Determine the equivalent state of stress If an...Ch. 9 - The crane is used to support the 350-lb load....Ch. 9 - Determine the equivalent state of stress on an...Ch. 9 - The propeller shaft of the tugboat is subjected to...Ch. 9 - Determine the principal stresses in the box beam...Ch. 9 - Determine (a) the principal stresses and (b) the...Ch. 9 - Determine the stress components acting on the...
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