DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 39, Problem 44RQ
What is the benefit of a self-tapping fastener?
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6/86 The connecting rod AB of a certain internal-combustion engine weighs 1.2 lb with mass center at G
and has a radius of gyration about G of 1.12 in. The piston and piston pin A together weigh 1.80 lb. The
engine is running at a constant speed of 3000 rev/min, so that the angular velocity of the crank is
3000(2)/60 = 100л rad/sec. Neglect the weights of the components and the force exerted by the gas in
the cylinder compared with the dynamic forces generated and calculate the magnitude of the force on the
piston pin A for the crank angle 0 = 90°. (Suggestion: Use the alternative moment relation, Eq. 6/3, with B
as the moment center.)
Answer
A = 347 lb
3"
1.3"
B
1.7"
PROBLEM 6/86
6/85 In a study of head injury against the instrument panel of a car during sudden or crash stops where
lap belts without shoulder straps or airbags are used, the segmented human model shown in the figure is
analyzed. The hip joint O is assumed to remain fixed relative to the car, and the torso above the hip is
treated as a rigid body of mass m freely pivoted at O. The center of mass of the torso is at G with the initial
position of OG taken as vertical. The radius of gyration of the torso about O is ko. If the car is brought to a
sudden stop with a constant deceleration a, determine the speed v relative to the car with which the
model's head strikes the instrument panel. Substitute the values m = 50 kg, 7 = 450 mm, r = 800 mm, ko
= 550 mm, 0 = 45°, and a = 10g and compute v.
Answer
v = 11.73 m/s
PROBLEM 6/85
Chapter 39 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 39 - What would be some of the characteristics of an...Ch. 39 - What are some of the applications of adhesives in...Ch. 39 - What are some of the types of materials that have...Ch. 39 - What are some of the ways in which adhesives can...Ch. 39 - What is a structural adhesive?Ch. 39 - Prob. 6RQCh. 39 - What are some of the limiting characteristics of...Ch. 39 - What promotes the curing of cyanoacrylates? Of...Ch. 39 - Urethane adhesives might be favored when what...Ch. 39 - What features or characteristics might favor the...
Ch. 39 - How can the use of hot-melt adhesives be combined...Ch. 39 - What property enhancement characteristic is...Ch. 39 - What features or properties are provided or...Ch. 39 - What are some types of nonstructural or special...Ch. 39 - How can polymeric adhesives he made electrically...Ch. 39 - What types of radiation can be used with...Ch. 39 - What are some of the temperature considerations...Ch. 39 - What are some of the environmental conditions that...Ch. 39 - What is the difference between a...Ch. 39 - Why is it desirable for adhesive joints to be...Ch. 39 - Why are butt joints unattractive for adhesive...Ch. 39 - What types of joints provide large bonding areas?Ch. 39 - How does the strength of an adhesive joint vany...Ch. 39 - What are some common techniques by which surfaces...Ch. 39 - How can destructive testing and the examination of...Ch. 39 - Why are the structural adhesives an attractive...Ch. 39 - In view of the relatively low strengths of the...Ch. 39 - Why might an adhesive joint provide enhanced...Ch. 39 - What are some of the other attractive properties...Ch. 39 - In what ways might a structural adhesive offer...Ch. 39 - Why are adhesive joints unattractive for...Ch. 39 - Describe some of the ways that structural...Ch. 39 - What are some other common limitations to...Ch. 39 - What is weld bonding?Ch. 39 - What are some common types of mechanical...Ch. 39 - What factors would influence the selection of a...Ch. 39 - What types of fasteners are attractive if the...Ch. 39 - What factors determine the overall effectiveness...Ch. 39 - What is an integral fastener? Provide an example.Ch. 39 - What are some of the primary types of discrete...Ch. 39 - Prob. 41RQCh. 39 - What are some of the major assets of mechanical...Ch. 39 - What are some of the ways that fastener holes can...Ch. 39 - What is the benefit of a self-tapping fastener?Ch. 39 - What are some of the common causes for failure of...Ch. 39 - What are galvanic corrosion problems common when...Ch. 39 - From a manufacturing viewpoint, why is it...Ch. 39 - What are some of the ways that plastics can be...Ch. 39 - Why can the thermoplastic polymers be welded, but...Ch. 39 - Prob. 50RQCh. 39 - Describe several of the plastic joining processes...Ch. 39 - Prob. 52RQCh. 39 - How can metal inserts be used to produce welds in...Ch. 39 - Prob. 54RQCh. 39 - What is the difference between direct laser...Ch. 39 - Give an everyday example of solvent welding.Ch. 39 - What material property enables snap-fits to be a...Ch. 39 - Why are the crystalline ceramic materials...Ch. 39 - Prob. 59RQCh. 39 - Prob. 60RQCh. 39 - When materials are joined, interfaces are created...Ch. 39 - Some automakers are using adhesives and sealants...Ch. 39 - Select two types of additives to industrial...Ch. 39 - Identify at least five types of adhesives that...Ch. 39 - A contractor has installed aluminum siding on a...Ch. 39 - Mechanical fasteners are an attractive means of...Ch. 39 - Prob. 6PCh. 39 - Prob. 7PCh. 39 - Prob. 8PCh. 39 - Prob. 9PCh. 39 - Prob. 10PCh. 39 - You must devise a means of incorporating the...Ch. 39 - An additional joint occurs where the club head is...Ch. 39 - For production simplicity, it might be preferable...Ch. 39 - If the bonding process and resulting interface...Ch. 39 - Prob. 5CSCh. 39 - Prob. 6CS
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