Applied Statics and Strength of Materials (6th Edition)
6th Edition
ISBN: 9780133840544
Author: George F. Limbrunner, Craig D'Allaird, Leonard Spiegel
Publisher: PEARSON
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Chapter 19, Problem 19.2P
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If the maximum permissible shearing stress is 10,000 psi, how many 3/8'' bolts arranged in a 5'' diameter bolt circle are required to transmit 100 hp at 315 rpm through a flanged coupling.
Question No.16: A double threaded power screw with ISO metric trapezoidal threads with 15° semi-angle of thread
is used to raise a load of 300 kN. The nominal diameter is 100 mm and pitch is 12 mm. the coefficient of friction at
screw threads is 0.15. Neglecting collar friction, calculate; (i) torque required to raise the load, (ii) torque required
to lower the load and (iii) efficiency of the screw.
3. Find the power that can be safely transmitted by a flange type shaft coupling, if it has four equally spaced studs all at a radius of 50 mm from the shaft centre. The mean stud diameters are 12.5 mm, and each stud has a maximum safe working shear stress of 86 MPa. The shaft rotates at 3600 rpm.
Chapter 19 Solutions
Applied Statics and Strength of Materials (6th Edition)
Ch. 19 - Prob. 19.1PCh. 19 - Rework Problem 19.1 assuming a bearing-type...Ch. 19 - Rework Problem 19.1 assuming a bearing-type...Ch. 19 - Compute the allowable tensile load for the...Ch. 19 - Rework Problem 19.4 assuming a bearing-type...Ch. 19 - Rework Problem 19.4 assuming that the bolts are 34...Ch. 19 - Select the number and arrangement of 34 in....Ch. 19 - Calculate the allowable tensile load for the...Ch. 19 - In the connection shown, 14 in. side and end...Ch. 19 - Design the fillet welds parallel to the applied...
Ch. 19 - A fillet weld between two steel plates...Ch. 19 - Design an end connection using longitudinal welds...Ch. 19 - Calculate the allowable tensile load for the butt...Ch. 19 - Calculate the allowable tensile load for the lap...Ch. 19 - Calculate the allowable tensile load for the butt...Ch. 19 - Rework Problem 19.10 assuming that both plates are...Ch. 19 - Rework Problem 19.12 assuming that the angle is an...Ch. 19 - Two ASTM A36 steel plates, each 12 in. by 12 in. ,...Ch. 19 - Rework Problem 19.20 changing the fasteners to 34...Ch. 19 - Calculate the minimum main plate thickness for the...Ch. 19 - A roof truss tension member is made up of 2L6412...Ch. 19 - Rework Problem 19.23 changing the fasteners to six...Ch. 19 - Determine the allowable tensile load that can be...Ch. 19 - The welded connection shown is subjected to an...Ch. 19 - In Problem 19.26, use a 38 in. fillet weld, change...
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- Question No.15: Design muff coupling to connect two steel shafts transmitting 40 kW at 350 rpm. The material for shafts and key is plain carbon steel for which allowable shear and crushing stresses are 40 MPa and 80 MPa respectively. The material for muff is cast iron for which allowable shear stress is 15 Mpaarrow_forward1. A jack having square threads of 50 mm nominal diameter and 10 mm pitch is supporting a load of 89 kN. A double thread is used and the coefficient of friction maybe as low as 0.10 or as high as 0.15.a. Will this screw always self-locking?b. What is the highest torque necessary to raise the load?arrow_forwardIdentify the flange thickness (in mm) of a flange coupling having 6 bolts, that is 10-mm in diameter, with an 80-mm diameter bolt circle, which is used to connect two identical shafts that is 40-mm in diameter. The design shearing stress of the shaft is 20 MPa while the design crushing stress of the flange is 30 MPa.arrow_forward
- A high-strength steel band saw, 26 mm wide, runs over pulleys 1100 mm in diameter. What minimum thickness of the steel band can be used without exceeding a flexural stress of 270? Assume E = 210 GPa. Answer must be in mm.arrow_forwardDesign and draw a protective type of cast iron flange coupling for a steel shaft transmitting ‘P is 17kW at ‘N is 350 r.p.m. and having an allowable shear stress of 40 MPa. The working stress in the bolts should not exceed 30 MPa. Assume that the same material is used for shaft and key and that the crushing stress is twice the value of its shear stress. The maximum torque is 25% greater than the full load torque. The shear stress for cast iron is 14 MPa.arrow_forwardA flange coupling is to connect two 57 mm shafts. The hubs of the coupling are each 111 mm in diameter and 92mm thick and the flange web are 19 mm thick. Six 16 mm bolts in a 165 mm diameter circle connect the flange.The keyway is 6 mm shorter than the hub’s thickness and key is 14 mm x 14 mm. Coupling is to transmit 45 KW at160 rpm. For all parts, yield point value in shear is one – half the yield value which is 448 MPa. Calculate the forceon the shaftarrow_forward
- The rivets are 25-mm in diameter, A502, Grade 1, hot driven, with allowable shearing stress of 120 MPa. Assume the plates are adequate to transfer load to the rivets. P = 40 kN. 1. Which of the following most nearly gives the shearing stress on the most stressed rivet in MPa? a. 61 b. 68 c. 74 d. 83 2. of the following most nearly gives the maximum eccentricity in mm, if the load P is maintained? a. 756 b. 670 c. 445 d. 522 3. Which of the following most nearly gives the maximum load P in kN if the eccentricity is maintained? a. 72 b. 85 c. 68 d. 58arrow_forwardQuestion No.14: (a) Explain the Classification of Welded joints. (b) Explain the design of eccentrically loaded riveted joints. (c) The lead screw of a lathe has Acme threads of 50 mm outside diameter and 8 mm pitch. The screw must exert an axial pressure of 2500 N in order to drive the tool carriage. The thrust is carried on a collar 110 mm outside diameter and 55 mm inside diameter and the lead screw rotates at 30 r.p.m. Determine (a) the power required to drive the screw; and (b) the efficiency of the lead screw. Assume a coefficient of friction of 0.15 for the screw and 0.12 for the collar.arrow_forwardA flange coupling connects two 2” diameter shafts. The flanges are fitted with 6 bolts of SAE 1040 steel on a 7” bolt circle. The shafts runs at 300 rpm and transmits 45 hp. Assume a factor of safety of 5, ultimate tension of 70,000 psi, and ultimate shear of 55,000 psi. Determine: a) The torque transmitted, in-lbs b) The force applied per bolt, lbs c) The diameter of the bolt required, in d) The thickness of flanged to be used, inarrow_forward
- 1. A jack having square threads of 50 mm nominal diameter and 10 mm pitch is supporting a load of 89 kN. A double thread is used and the coefficient of friction maybe as low as 0.10 or as high as 0.15.c. What maximum torque is necessary to lower the load?d. What is the maximum torsional shear stress induced on the screw?arrow_forwardFor a square thread power screw, given that:F= 6.4 kNPitch = 5 mmMajor diameter = 32 mmTotal raising torque = 28 N.mThen then max. torsional shear stress equals:arrow_forward(11) Find the power required to drive a power screw lifting a load of 40001b. A 2½-in double square thread with 2TPI. is to be used. The frictional radius of the collar is 2-in and the coefficients of friction are 0.l for the threads and 0.15 for the collar. The velocity of the nut is 10fpm .arrow_forward
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