Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
6th Edition
ISBN: 9780134441184
Author: Robert L. Mott, Edward M. Vavrek, Jyhwen Wang
Publisher: PEARSON
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Chapter 5, Problem 41P
A circular bar of SAE 4140 OQT 1000 steel steps from 12 mm to 10 mm with a fillet radius of 1.5 mm and carries a repeated/reversed 7500 N axial force. Compute the design factor.
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A structural support for a machine will be subjected to a static
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square rod made from SAE 1020 hot-rolled steel. Specify suitable
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6. A circular bar is to carry a fluctuating torque from 25 to 55 N-m. Use AISI C1144 OQT 1000for the bar and compute for the required diameter for a design factor of 2. Attachmentsproduce a stress concentration of 2.5 near the ends of the bar.
please also give the FBD, thank you
A structural support for a machine is subjected to a static compression load of 20 kN. The support is
manufactured from a circular rod made from SAE 1040 Hot Rolled steel. Specify suitable diameter for the
cross section of the rod based on the basic size. Steel data are available in Table A-10 from the textbook.
Chapter 5 Solutions
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
Ch. 5 - A link in a mechanism is made from a round bar...Ch. 5 - A link in a packaging machine mechanism has a...Ch. 5 - A cantilevered boom is part of an assembly machine...Ch. 5 - For Problems1014, use the method outlined in...Ch. 5 - For Problems1014, use the method outlined in...Ch. 5 - Figure P524shows a hydraulic cylinder that pushes...Ch. 5 - The shaft shown in Figure P528is supported by...Ch. 5 - An aluminum rod, made from alloy 6061-T6, is made...Ch. 5 - A circular bar of SAE 4140 OQT 1000 steel steps...Ch. 5 - Compute the torsional shear stress in a circular...
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- A 1000 mm cast iron pulley is fastened to a 112 mm shaft by means of a 28 mm squarekey 160 mm long. The key and shaft are SAE 1030 steel annealed with allowableshearing of key at 200 MPa and compressive of 660 MPa. a. What force in lbs acting at the pulley rim will shear the key?b. What force in lbs acting at the pulley rim will crush the key?arrow_forwardCondition #1: A structural support for a machine is subjected to a static compression load of 20 kN. The support is manufactured from a circular rod made from SAE 1040 Hot Rolled steel. Specify suitable diameter for the cross section of the rod based on the basic size. Steel data are available in Table A-10 from the textbook. Condition #2: The same structural support of the basic size determined in Condition 1 is subjected to a tensile load of 15 kN that is repeated several thousand times over the life of the machine. This load is not an addition to the 20 kN. Specify a suitable steel that is suitable to this application based on the basic size determined in Condition #1. Loading of Condition #1 does not apply here. Condition #3: The same structural support from Condition 2 is heated from room temperature of 25°C. The support is placed inside a frame on both ends. There is a total clearance of 0.2 mm between the support and its frame. Initial length of the rod is 200 mm. Specify the…arrow_forwardThe tensile load on the bar mentioned varies from 4,000 lb to a minimum of 1,200 lb. Rapid cycling for many million cycles is expected. As the tensile load fluctuates between 4,000 lb and 1,200 lb, it creates fluctuating normal stresses. Calculate the following stresses at the section through the hole. Note: SAE 1050 OQT 1300 steel, wrought steel (a) Maximum tensile stress (psi) (b) Minimum tensile stress (psi) (c) Median stress (psi)arrow_forward
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- 4. Determine the design stress for bolts in a cylinder cover where the load is fluctuating due to gas pressure. The maximum load on the bolt is 50 kN and the minimum is 30 kN. The load is unpredict- able and factor of safety is 3. The surface of the bolt is hot rolled and the suface finish factor is 0.9. During a simple tension test and rotating beam test on ductile materials (40 C 8 steel annealed), the following results were obtained : Diameter of specimen =12.5 mm; Yield strength= 240 MPa; Ultimate strength= 450 MPa; Endurance limit = 180 MPa. [Ans. 65.4 MPa]arrow_forwardA piston rod, made of AISI 3140 steel, OQT 1000 F , is subjected to a repeated, reversed load. The rod is for a 20-in. air compressor, where the maximum pressure is 125 psig. Compute the diameter of the rod using a design factor based on (a) ultimate strength, (b) yield strength. For AISI 3140, OQT 1000 F, Su=152.5 ksi, Sy=132.5 ksi, Nu=8, Ny= 4arrow_forwardCondition #1: A structural support for a machine is subjected to a static compression load of 20 kN. The support is manufactured from a circular rod made from SAE 1040 Hot Rolled steel. Specify suitable diameter for the cross section of the rod based on the basic size. For condition 1: It was given to you to use SAE1040 hot rolled steel. In the high-stakes project, you select a different steel for the analysis for condition 1 and determine the basic size A-10 Typical properties of carbon and alloy steels. Ultimate strength,s, Yield strength, s Percent elongation Material SAE no. Condition ksi MPa MPa Annealed Hot rolled Cold drawn 1020 57 65 75 393 448 517 43 48 296 331 441 36 36 20 1020 1020 64 Annealed Hot rolled Cold drawn WQT 700 WQT 900 WOT 1100 WQT 1300 1040 75 90 517 51 30 25 1040 621 669 876 814 738 414 565 641 621 552 60 1040 97 16 19 22 24 1040 1040 1040 127 118 107 93 90 80 1040 87 600 63 434 32 1080 Annealed OQT 700 OQT 900 OQT I100 OQT 1300 614 1303 1234 1000 89 54 372…arrow_forward
- Your task is to design a full journal bearing to support the crankshaft of an engine. The crankshaft would be attached a journal that would be rotating within the bushing. The maximum speed of rotation of the crankshaft is 6000 rpm. The operating temperature is 130-F. The load on the bearing is 675lbf. The journal diameter has to fit on the crankshaft and has to be 2.5in. The length of the bearing has to be under 1.5in. The oil used in the engine is SAE 50. The performance of your bearing should have a maximum coefficient of friction of 0.04 and a minimum film thickness no lower than 0.001in. Determine the bearing dimensions you will use based on your goals and the charts in your formula sheet.arrow_forward1. A piston rod, made of AISI 3140 steel, OQT 1000 F, is subjected to a repeated, reversed load. The rod is for a 20-in. air compressor, where the maximum pressure is 125 psig. Compute the diameter of the rod using a design factor based on: (a) ultimate strength, 1.62 in 1 5/8 in (b) yield strength. 1.23 in = 1 % in For AISI 3140 steel, OQT 1000 F Su = 152 5. ksi Nu = 8 Sy = 132 5. ksi Ny = 4arrow_forward3. An M16 x 2 bolt with a slotted hex nut is used to clamp together two 25 mm steel plates. The joint is assembled with a size 16 N washer underneath the bolt head. The bolt is a 5.8 class metric grade, with a proof strength of 380 MPa. The joint is intended to be permanent. Determine a suitable length for the bolt, rounded up to the nearest standard size in millimeters. Calculate the bolt stiffness, the elongation of the bolt after the necessary preload is developed, and the bolt torque required to apply the preload. Assume that coefficients of friction between the bolt, nut, and collar are all ~0.15. For steel, use E = 207 GPa. Standard threaded fastener lengths, dimensions of hexagonal nuts, and dimensions of metric plain washers are provided in the textbook appendices.arrow_forward
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