A thin walled steel cylindrical pressure vessel with a radius of 800 mm and a wall thickness of 38 mm is designed to carry an internal pressure of 8 MPa. The steel has a fracture toughness of 95 MPa ,/m and a yield strength of 520 MPa. For this material take the exponent in Paris relation, m = 3 and the coefficient, C= 10-11.
Answer the following questions, stating clearly how you obtained each answer.
• i.What is the maximum crack length through the wall that the vessel can tolerate when operating at the maximum internal pressure to give a reserve factor of 2.5 on the load? • ii.On inspecting the vessel, a welding defect in the shape of a through-thickness edge crack is discovered and is measured to be 4 mm long. Determine how many pressurising cycles will it take for the crack to grow to the size determined in part (i) if the vessel is regularly cycled to 90% of its maximum internal pressure? iii.When the crack has grown to 6.0 mm the vessel is accidently subjected to 100 overload cycles equal to 436 MPa. Again using the fatigue calculator, determine what length the crack will grow to during these overload cycles? What is the percentage reduction in life as found in part (ii) due to these overload
Dale Dyer, who was employed by National By-Products, Inc., was seriously injured at work as the result of a job-related accident. He agreed to give up his right to sue th...Aug 02 2021
Given aggregate demand, a decrease in aggregate supply creates:a. Cost-push inflationb. Demand-pull inflationMay 05 2021
In Betty Crocker’s Cookbook, it is stated that it takes 2 h 45 min to roast a 3.2-kg rib initially at 4.5°C “rare” in an oven maintained at 163°C. It is recommended that ...Jun 09 2020
Water molecules tend to diffuse in response to their own concentration gradient. How can water be more or less concentrated?Jun 27 2021
Although the topic of suicide is treated in a more personal manner in the text, the authors acknowledge that suicide isa.a venial sin.b.a mortal sin.c.a public health iss...Dec 12 2019
Shared ideas about what is good and desirable are known as values. Values provide us witha.standards for appearance.b.standards of living.c.standards for judging ways of ...Dec 16 2019
Discuss which type of security would be the best to invest in if you had spare funds and whyAug 16 2021
Use the free hand drawing to illustrate how each of the following events affects the equilibrium price and quantity of dried noodle(i) The price of the flour rises(ii) Th...Mar 19 2020
From the following list, identify the accounts that should be closed to Tim Button, Capital at the end of the fiscal year under a perpetual inventory system:(a) Accounts ...Apr 14 2021
How much and to whom do businesspeople listen?YOUR TASK. Interview a businessperson about his or her workplace listening. Connect with a worker in your circle of friends,...Aug 20 2021