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 ... the particle (see figure 7. 2). If Young’s modulus of the particles is smaller than that of the matrix, the stress is raised in the vicinity o...

Ngày tải lên: 11/08/2014, 15:20

... 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 to section ... time (figure 10.31(a)). If, on the other hand, the experiment is stress-controlled at a non-zero mean stress, the hys- 10 .7 Fatigue of notched specimens 377 ¾ a,nns ¾ a,max ¾...

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... CrMo 4-4 285 1 37 49 21 CrMoV 5-1 1 410 349 212 92 austenitic steels X 5 CrNi 1 8-1 0 1 27 74 30 X 10 CrNiNb 1 8-9 300 205 131 55 18 X 5 CrNiMo 1 7- 1 2-2 145 52 23 nickel-base superalloys IN 73 8 360 155 SC ... Creep deformation In section 8.2.1, the time-dependent behaviour of polymers was described using spring -and- dashpot models. a) Sketch a spring -and- dashpot mode...

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... GPa metals and semi-metals Al 70 64 76 1.23 108 61 29 Au 78 43 1 17 1.89 186 1 57 42 Cu 121 67 192 3.22 168 121 75 α-Fe 209 129 276 2.13 233 124 1 17 Ni 2 07 1 37 305 2.50 2 47 1 47 125 Si − 130 188 1. 57 166 ... 3.0 p ol ypropylene 0.9 p ol yethylene 0.2 . . . 0 .7 composites carb on-fibre reinforced polymers 70 . . . 200 glass-fibre reinforced polymers 7 . . . 45 woo...

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... 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...

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... 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) Non-close-packed plane ... lattices. Face-centred cubic 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 a...

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... elastically, and the stiffness increases. In the context of fibre- and plate-shaped particles this will be discussed further in chapter 9. The amount of load transfer depends strongly on the shape of the particles and ... exces- sive coarsening of the precipitates. To use high-strength materials at high temperatures, another method of particle strengthening can be achieved by...

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... 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 ... chain molecules is larger and enables 9 Mechanical behaviour of fibre reinforced composites In composites, different materials are combined to exploit fa...

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... application of ceramic matrix composites are cutting tools made of SiC-whisker reinforced aluminium oxide for cutting of hard-to-machine materials, especially nickel- base superalloys and hardened ... enamel. 314 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-ph...

Ngày tải lên: 11/08/2014, 15:20