Indicate briefly how the following affect fatigue life:
a. A good surface finish
b. The presence of a rivet hole
c. A significant mean tensile stress
d. A corrosive atmosphere
2. The next diagrams show a pulley block used to deploy an underwater platform from an offshore exploration rig. There are two modes of use: (a) when lowering or raising the platform off the side of the rig, (b) when slewing the platform over the deck of the rig. After about 200 deployments, the bolt broke and the platform was lost overboard. Where do you think the fracture occurred? Would you categorize the fracture as low-cycle or high-cycle fatigue? Support your answer by an approximate calculation. The bending moment at which a circular cross-section starts to yield is given by the standard equation
The steel of the bolt had a yield strength of 540 MN m–2. How would you modify the design to ensure that the connection between the lifting eye and the pulley block is less likely to fail by fatigue?
(a) Schematic of pulley block when lowering or raising. The crane exerts a straight pull along the axis of the lifting eye.
(b) Schematic of pulley block when slewing. The crane now exerts an oblique pull on the lifting eye.
(c) Details of lifting eye.
(d) Forces acting on the bolt when slewing.
Timing Technology Inc. manufactures timing devices. During 20×1, 900,000 Units were completed and transferred to finished-goods inventory. On December 31, 20×1 there were...May 28 2020
Samson Corporation's common stock is priced at $30.50 per share before any stock dividend or split, and the stockholders' equity section of its balance sheet appears as f...May 03 2018
Engineers at Boeing developing specs for their “next-generation” 737 aircraft needed to know the acceleration of the 737-900 during a typical take-off. (a) What accelera...Apr 02 2020
Refer to the information in Problem 17-34. Suppose that Larsen Corp. uses the FIFO method instead of the weighted-average method in all of its departments. The only chang...Apr 15 2020
The director of cost management for Odessa Company uses a statistical control chart to help management determine when to investigate variances. The critical value is 1 st...Apr 12 2020
A preferred stock is expected to pay a constant quarterly dividend of $1.25 per quarter into the future. The required rate of return, Rs, on the preferred stock is 13.5 p...May 26 2020
The Castillo Products Company was started in 2011. The company manufactures components for personal decision assistant (PDA) products and for other handheld electronic pr...Apr 30 2020
If you think that the economy is entering a recession, and fear that you might lose your job, explain how your actions of lowering your consumption level ...Dec 11 2019
Firms can close the __________ gap by matching customer expectations with actual service through use of marketing metrics. A.seniorityB.knowledgeC.standardsD.deliveryE...Dec 14 2019
Discussion Questions 1. How does the concept of product life cycle apply to Regal Marine products? 2. What strategy does Regal use to stay competitive? 3. What kind of...Jun 14 2020