Question 15.3: Preloaded Fasteners in Dynamic Loading Problem Repeat Exampl...
Preloaded Fasteners in Dynamic Loading
Problem Repeat Example 15-2 with a fluctuating load applied to the joint. Determine a suitable bolt size and preload for the joint shown in Figure 15-23 (repeated). Find its safety factors against fatigue, yielding, and separation. Determine the optimum preload as a percentage of proof strength to maximize the fatigue, yielding, and separation safety factors.
Given The joint dimensions are D = 1 in and l = 2 in. The applied load fluctuates between P = 0 and P = 1000 lb.
Assumptions The bolt has rolled threads. Both of the clamped parts are steel. The effects of the flanges on the joint stiffness will be ignored. A preload of 90% of the bolt’s proof strength will be applied as a first trial. Use 99% reliability and an operating temperature of 300°F.
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