Why do tubes have a tendency to buckle when bent?
Why do tubes have a tendency to buckle when bent? Experiment with a straight soda straw, and describe your observations. Recall that, in bending of any section, one-half of the cross section is under tensile stresses and the other half under compressive stresses. Also, compressing a column tends to buckle it, depending on its […]
In deep drawing of a cylindrical cup, is it always necessary that there to be tensile circumferential stresses on the element in the cup wall, a shown in Fig. 7.50b? Explain.
In deep drawing of a cylindrical cup, is it always necessary that there to be tensile circumferential stresses on the element in the cup wall, a shown in Fig. 7.50b? Explain. The reason why there may be tensile hoop stresses in the already formed cup in Fig. 7.50b on p. 388 is due to […]
explain why and how these variables influence the force.
Make a list of the independent variables that influence the punch force in deep drawing of a cylindrical cup, and explain why and how these variables influence the force. The independent variables are listed at the beginning of Section 7.6.2. The student should be able to explain why each variable influences the punch force, […]
Are square grid patterns, as shown in Fig. 7.65, useful? Explain.
Comment on the role of the size of the circles placed on the surfaces of sheet metals in determining their formability. Are square grid patterns, as shown in Fig. 7.65, useful? Explain. We note in Fig. 7.65 on p. 400 that, obviously, the smaller the inscribed circles, the more accurately we can determine the magnitude […]
What are the reasons for developing forminglimit diagrams?
What are the reasons for developing forminglimit diagrams? Do you have any specific criticisms of such diagrams? Explain. The reasons for developing the FLD diagrams are self-evident by reviewing Section 7.7.1. Criticisms pertain to the fact that: (a) the specimens are still somewhat idealized, (b) frictional conditions are not necessarily representative of actual operations, […]