Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 4 docx
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 4 docx
... crack-growth resistance or crack-extension resis-
tance K
IR
.
12
The crack-growth resistance initially increases in materials form-
ing a process zone, a behaviour frequently denoted R curve behaviour. ... not to depart too far out of the
region of smallest cross section. On the one hand, this is due to the smaller
stress level in the thicker parts of the specimen. On the other ha...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 13 docx
... 232, 248 , 255, 310, 345 , 48 0
– fatigue 340 , 342 – 344 , 347 ,
349 –357, 3 74, 41 9, 44 7
– grain boundary 341
– impeding 229–2 34, 249 –255,
308–312
– silicon nitride 250
– stable 146 –150, 2 34, 343
– subcritical ... dissipation 72, 95, 110, 189, 2 74,
339, 41 8, 44 4, see also crack
propagation – energy
– elastic 42 43 , 1 34 142 , 2 74, 40 9,
42 8, 47 5, 47 7, 47 8
– fre...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 2 doc
... 2.50 247 147 125
Si − 130 188 1.57 166 64 80
W 41 1 41 1 41 1 1.00 501 198 151
ceramics
diamond − 1050 1200 1.20 1076 125 576
MgO 310 247 343 1. 54 291 90 155
NaCl 37 44 32 0.72 49 13 13
TiC − 47 6 42 9 ... the
case of a cubic crystal, C
4
4
= C
44
, so
C
44
=
C
11
− C
12
2
.
It is sufficient to know the elastic constants in one coordinate system (for
example, S
11
, S...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 5 doc
... crystal
The face-centred cubic crystal is close-packed (see section 1.2.2). Planes of
type {111} and directions of the type 110 are close-packed and thus form
the slip systems (figure 6. 14) . If we ... figure 6.3.
176 6 Mechanical behaviour of metals
(a) Close-packed plane or direction. Slip is relatively easy, as the upper
array of spheres has to be lifted only slightly
(b)...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 6 ppt
... explained, using th e example of
the alloy system aluminium-copper.
212 6 Mechanical b ehaviour of metals
¿
¿
¿
¿
Fig. 6 .44 . Formation of an anti-phase boundary during slip of a dislocation through
an ... the particle if the
material is stressed elastically, and the stiffness increases. In the context of
fibre- and plate-shaped particles this will be discussed further in chapt...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 7 pptx
... expansion of the two materials,
the matrix is stressed compressively near the particles, impeding crack propa-
262 8 Mechanical behaviour of polymers
T
degree of polymerisation
10
7
10
6
10
5
10
4
10
3
10
2
10
1
T
m
T
g
viscous ... analogous to the melting of
266 8 Mechanical behaviour of polymers
0 1 2 3 4 5
"/%
¾/MPa
50
0
10
20
30
40
25
0
5
10
15
20
12
0
2...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 8 pot
... Araneus diadematus and
8 .4 Plastic behaviour 275
Table 8.1. Cross-linking density and Young’s modulus of different types of polymers
(cf. section 1 .4. 2)
type of material cross-linking density E/GPa
thermoplastics ... microscopic
fibres
(microfibrils)
Fig. 8.21. Stages of plastic deformation of a semi-crystalline thermoplastic (after [44 ,
82])
larvae of the silk moth Bomb...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 9 pot
... enamel.
3 14 9 Mechanical behaviour of fibre reinforced composites
¾
¾
¾
¾
Fig. 9.11. Deformation of a fibre composite under compressive stress. The fibres
can b end in an in-phase or out -of- phase pattern
The ... in phase or out of phase.
9 .4 Examples of composites 317
3 000
3 500
4 000
4 500
5 000
5 500
6 000
6 500
200 40 0 600 800
E/GPa
R
m
MPa
pan
Pitch
Fig. 9.12. M...
Mechanical Behaviour of Engineering Materials - Metals, Ceramics, Polymers and Composites 2010 Part 10 pptx
... % glass
40 % glass
40 % C
Fig. 10.25. Comparison of the S-N curves of unreinforced as well as glass- and
carb on-reinforced polysul fone (simplified plot after [29])
S-N curves of fibre composites
According ... 10. 24. S-N curves for fully reversed bending of several polymers at a temper-
ature of 20℃ and a loading frequency of 10 Hz (polyamide: 15 Hz, after [41 ])
50
200...