Figure 1 shows the stress-number cycles to failure (S-N) curve for a cylindrical acetalpolymer bar. The cylindrical bar is 200 mm long and 15 mm in diameter is subjected to avibrational load at one end of the bar at a frequency of 500 vibrations per minute with aload of 50 N.60508Stress amplitude (MPa)302010105 106 107 108Cycles to failureFigure 1: The S-N fatigue curve for an acetal polymer.104(i) Evaluate the duration (in hours) the part will survive before breaking?(ii) Suppose the cylindrical bar is to survive for one million cycles under conditions thatprovide for equal compressive and tensile stresses. Evaluate the maximum stress, theminimum stress, and the mean stress on the part during its use. Explain the effect offrequency on the stress application would have on your answers.

Solution: In this problem, the time required for a cylindrical acetal polymer when subjected to a…

Figure 1 shows the stress-number cycles to failure (S-N) curve for a cylindrical acetal polymer bar. The cylindrical bar is 200 mm long and 15 mm in diameter is subjected to a vibrational load at one end of the bar at a frequency of 500 vibrations per minute with a load of 50 N. 50 8 Stress amplitude (MPa) 30 20 10 104 106 Cycles to failure Figure 1: The S-N fatigue curve for an acetal polymer. 107 108 (i) Evaluate the duration (in hours) the part will survive before breaking?

Figure 1 shows the stress-number cycles to failure (S-N) curve for a cylindrical acetal polymer bar. The cylindrical bar is 200 mm long and 15 mm in diameter is subjected to a vibrational load at one end of the bar at a frequency of 500 vibrations per minute with a load of 50 N. 50 8 Stress amplitude (MPa) 30 20 10 104 106 Cycles to failure Figure 1: The S-N fatigue curve for an acetal polymer. 107 108 (i) Evaluate the duration (in hours) the part will survive before breaking?

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter3: Operational Amplifiers In Chemical Instrumentation

Section: Chapter Questions

Problem 3.7QAP

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