Page 236 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Synthesis, Design, and Projects 2l5

8.44. Obtain some data from the technical literature in the 8.48. It has been noted that the strength of brittle materials
Bibliography, and quantitatively show the effects of tempera- (such as ceramics and glasses) is very sensitive to surface
ture on the strength and the modulus of elasticity of several defects, such as scratches (known as notch sensitivity). Obtain
ceramics. Comment on how the shape of these curves differs several pieces of these materials, scratch them, and test them
from those for metals. by carefully clamping them in a vise and bending them.
8.45. Assume that the cantilever beam in Quantitative Comment on your observations.
Problem 3.16 in Chapter 3 is made of ceramic. How different 8.49. Electric space heaters for home use commonly utilize a
would your answer to that problem be if the beam were made ceramic filament as the heating element. List the required
of metal? Explain clearly, giving numerical examples. mechanical properties for this filament, explain Why a ceramic
8.46. It was noted in Section 8.4.1 that there are several is a suitable material, and perform an Internet search to
basic types of glasses available. Make a survey of the techni- determine the specific ceramic material actually utilized in this
cal literature, and prepare a table for these glasses, indicating application.
various mechanical, physical, and optical properties.
8.47. Ceramic pistons are being considered for high-speed
combustion engines. List the benefits and concerns that you
would have regarding this application.