Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 8, Problem 42QTP
To determine
Determine thermal conductivities for ceramics at porosities of 10%, 20% and 40% for
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A ceramic with KIc = 4 MPa m1/2 contains pores with radius a = 5 µm due
to incomplete sintering. These pores lead to a decrease in the failure stress
of the material in both tension and compression. One in every ten grainboundary junctions contains a void; the grain size of the ceramic is 50 µm.
The ceramic fails in compression when the length ℓ of each crack generated
at the voids equals one-half of the spacing between the voids.
(a) Determine the compression strength of the ceramic, using the equation
from Sammis and Ashby.
(b) Determine the tensile strength of the ceramic, assuming flaws with
size a.
Nickel oxide (NiO) is a ceramic that
has the same crystal structure as
NaCl.
Given:
R(Ni2+)= 0.075 nm and R(02)=0.132
Calculate the lonic Packing Factor
(IPF) of NiO?
O Na
CI
Select one:
a. 0.47
b, 0.74
c. 0.64
d. 0 12
e. 0.14
f. 0.21
g. 0.41
Discussion:
Why the temp. of water increases rapidly than the paraffin when
they heated together ?
Why the the temp. of paraffin decreases rapidly than the temp. of
water when they cooling together?
What about density?
Chapter 8 Solutions
Manufacturing Engineering & Technology
Ch. 8 - What is a ceramic?Ch. 8 - List the major differences between the properties...Ch. 8 - List the major types of ceramics that are useful...Ch. 8 - What do the following materials typically consist...Ch. 8 - Prob. 5RQCh. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - Prob. 10RQ
Ch. 8 - Prob. 11RQCh. 8 - Prob. 12RQCh. 8 - Prob. 13RQCh. 8 - Prob. 14RQCh. 8 - Prob. 15RQCh. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - Explain why ceramics are weaker in tension than in...Ch. 8 - What are the advantages of cermets? Suggest...Ch. 8 - Explain why the electrical and thermal...Ch. 8 - Prob. 22QLPCh. 8 - Prob. 23QLPCh. 8 - Explain why the mechanical properties of ceramics...Ch. 8 - Explain how ceramics can be made tougher.Ch. 8 - List and describe situations in which static...Ch. 8 - What properties are important in making...Ch. 8 - A large variety of glasses is now available. Why...Ch. 8 - Prob. 29QLPCh. 8 - Prob. 30QLPCh. 8 - Aluminum oxide and PSZ are described as white in...Ch. 8 - Why does the strength of a ceramic part depend on...Ch. 8 - In old castles and churches in Europe, the glass...Ch. 8 - Prob. 34QLPCh. 8 - Prob. 35QLPCh. 8 - Perform an Internet search and determine the...Ch. 8 - Prob. 37QLPCh. 8 - Prob. 38QLPCh. 8 - In a fully dense ceramic, UTSO = 200 MPa and EO =...Ch. 8 - Plot the UTS, E, and k values for ceramics as a...Ch. 8 - What would be the tensile strength and the modulus...Ch. 8 - Prob. 42QTPCh. 8 - Prob. 43QTPCh. 8 - Prob. 44QTPCh. 8 - Prob. 45SDPCh. 8 - Prob. 46SDPCh. 8 - Prob. 47SDPCh. 8 - Prob. 48SDPCh. 8 - Prob. 49SDPCh. 8 - Prob. 50SDPCh. 8 - Conduct a literature search and write a brief...Ch. 8 - Prob. 52SDPCh. 8 - Prob. 53SDPCh. 8 - It has been noted that the strength of brittle...Ch. 8 - Prob. 55SDP
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- EXAMPLE During service, a ceramic valve which is operating at 250°C is likely to be suddenly quenched to room temperature by a flowing aqueous solution. The valve could be manufactured from either of two ceramics, designated A and B, the properties of which are given below. Discuss which ceramic you would select for the application Young's Modulus E (GNm Coefficient of thermal expansion u (K) Fracture Stress , (MNm³³) Poisson's ratio u Thermal conductivity (at 50°C) x (Wm: 'K') 120 2X10 230 0.25 14 B 350 9X104 270 0.27 Amplearrow_forwardThe flexural strength and associated volume fraction porosity for two specimens of the same ceramic material are as follows: Ofs (MPa) P 100 50 i 0.05 (a) Compute the flexural strength for a completely nonporous specimen of this material. 0.20 i MPa (b) Compute the flexural strength for a 0.30 volume fraction porosity. MPaarrow_forward(Porosity). A dry rock weighs 240 grams and has a bulk density of 2.4 grams per cubic centimeter. When saturated with pure water at room temperature (T=25°C), it weighs 250 grams. At room temperature, specific volume of water is 1.00295 x10-3 m3/kg. Calculate the porosity of the sample. (Permeability). A cylindrical core sample of 1 cm length and 1 cm2 cross-section has upstream and downstream pressures of 2 atm and 1 atm, respectively, during steady state flow of water at 0.997 g/s at room temperature. Calculate the permeability of the core. Note: Water @ 25°C, viscosity = 1 cp, density of water = 0.997 g/cm3. SHOW SOLUTIONS PLSarrow_forward
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- Rank the materials from highest to lowest of which has the best thermal shock resistance without doing any calculations. we know that ceramics with low thermal expansion, low elastic moduli, and high fracture toughness are resistant to thermal shock.arrow_forwardThe modulus of elasticity for a ceramic material having 4.1 vol% porosity is 323 GPa. (a) Calculate the modulus of elasticity (in GPa) for the nonporous material. E = i E = (b) Calculate the modulus of elasticity (in GPa) for 11.7 vol% porosity. GPa i GPaarrow_forwardCalcium oxide (CaO) is a ceramic that has the same crystal strudture as NaCl. Given: R(Ca2)= 0.106 nm and R(O²)-0.132 Calculate the lonic Packing Factor (IPF) of CaO? Select one: Oa. 0.542 Ob.0.21 Oc.0.41 Od.0.12 Oe 0.47 O to.14 Og0.51 On074. 9:12 PM A D 4) ENG 15-Apr-2021arrow_forward
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