This preview shows page 1. Sign up to view the full content.
Unformatted text preview: tigue cycle to the ultimate strength and the number of fatigue cycles to failure.
the thermal conductivity divided by the product of the
uniﬁed life-cycle cost engineering A cost analysis
It is common to deﬁne fatigue life in terms of the modulus ratio, E E0 , because loss of
heat capacity at constant pressure multiplied by density.failure. procedure that considers the overall cost of a piece of
stiffness in many composite structural applications constitutes functional
equipment including its manufacturing cost and also the
As discussed earlier, high stresses are generated cracking caused by time a comthermal fatigue A mechanism of at the interfaces every
posite containingstresses that aresigniﬁcantly different coefﬁcients of thermal expancomponents with induced by thermal ﬂuctuations.
operating cost during service.
sion is subjected to a temperature change. If repeated heating and cooling are part of a
uniform corrosion A common type of electrochemica
thermal shock A thermal fatigue can that This phenomenon affects
component’s service duty cycle, failure mechanism occur.can result
corrosion resulting from a time-varying change in the
when a brittle material is subjected to a sudden change
the interfaces most signiﬁcantly because the thermal fatigue shear stresses obtain their | v location of the local anodic regions.
(usually a decrease) in temperature.
thermodynamics The science dealing with the
uniform strain u The strain in a specimen that
relationships between the thermal properties of matter of Contents
occurs before reaching the ultimate tensile strength.
e-Text Main Menu
v pg603 [R] sites normally occupied by A. The solution so formed is
thermoplastic polymer A polymer composed of
said to / Schaffer
G1 7-27060 / IRWIN be a substitutional solid solution of B in A.
long-chain13.01.98 plm oftenQC2
molecules plm composed of a covalently
superalloys FCC alloys containing nickel, cobalt, iron,
bonded backbone and various side groups. These
and chromium strengthened with a ﬁne dispersion of
macromolecules can be heated to form a melt repeatedly.
Ni3(Al, Ti) precipitates.
thermoset polymer 603 A polymer (usually composed of a
Chapter 14 Composite Materials
superconductivity A state of matter in which there is
three-dimensional network of covalently bonded atoms)
no resistance to the motion of electrical charge carriers.
that does not melt when reheated.
supercooled liquid A liquid that is below its thermotie line Horizontal line drawn on a phase diagram in a
dynamic melting temperature. A supercooled liquid is
two-phase ﬁeld connecting the composition of the two
metastable at best and may crystallize at any time.
phases in equilibrium.
σ max = 110 MPa
supercooling Cooling below a transformation
tilt boundary A boundary composed of edge
temperature without the transformation occurring.
dislocations of the same sign stacked vertically above on
another. As a result of all of the extra half planes being
surface tension Energy...
View Full Document