Mechanical properties, changes

As discussed earlier, the first wall materials in next generation machines will receive from 0.005 to 30 displacements per atom. At the lower end of this range (<0.01 dpa) there are essentially no mechanical property changes expected in graphite materials. However, even at these low doses thermal conductivity and stored energy are of concern. For displacement levels >0.01 dpa other property... 

P.R. Dawson On modeling of mechanical property changes during flat rolling of aluminum. Int. J. Solids Struct. 23, 947-968 (1987)... 

There are two basic types of transient dynamic mechanical experiments which were performed In this study. The first type Involves Isothermal cycling of an epoxy sample between a dry and wet environment. The second type of experiment Involves cycling the epoxy sample between two different temperatures under a liquid water environment. In each case, the transient and equilibrium values of dynamic mechanical properties change In a unique manner. 

Not all mechanical properties change with moisture content. The performance of wood under dynamic loading conditions is a dual function of the strength of the material, which is decreased with increased moisture content, and the pliability of the material, which is increased with increased moisture contents. Changes in strength and pliability offset one another and, therefore, mechanical properties that deal with dynamic loading conditions are not usually affected by a changing moisture content. 

Figure 24. Diagram of mechanical properties change at 20 °C across annealed ingots from a D16 grade alloy containing 0.14% Zr (of the 2124 type).

Both formulations have a wide use temperature range (0 to 125 C), that is, mechanical properties change very... 

A mechanical property A of the system is by definition, any function of the state that is, A = A(r) = A(qi,pi,..., Pf) (cf. Section 2.3). As the state Tchanges the mechanical properties change. The property A depends on the time only through the dependence of the state T on the time that is, A is an implicit function of the time. It is simple to show2 that the rate of change of A is... 

PA-6/LCP Mechanical properties Changes in mechanical explained in terms of morphology La Mantia et aL, 1989... 

The mechanical properties changed as shown in Figure 12.5 the elongation at break decayed with dose, but the tensile strength did not change until 7 kGy by irradiation at 150°C. At 25°C irradiation, the elongation was almost constant in the range of 10 kGy and decreased to half values after several 100 kGy. 

Figure 3.2 Mechanical property change of photo-biodegradable polyethylene carrier bags during outdoor exposure in England (Reproduced with permission from D. Gilead and G. Scott, in Developments in Polymer Stabilisation - 5, ed. G. Scott, Applied Science Publications, 1982, p. 103)...

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