Tensile properties radiation, effects

Table VI. Effect of Radiation on Tensile Properties of Tinplate...

Table VII shows the data on the effect of the low-temperature irradiation on the tensile properties of cast 98-2 solder (98% lead-2% tin). These data indicate that the radiation had no effect on the tensile properties of the commercial solder which is used for the side seam of tinplate containers. Metallographic examination confirmed the absence of change in the microstructure of the solder after irradiation. (Figure 2).

Radiation effects and oxidation causes changes in the tensile properties of the canning material. Fresh fuel has a can that is very ductile whereas the can of spent high bum-up fuel normally is hard and brittle. 

Effects of silica modifled by radiation- and thermal-induced admicellar polymerization on the mechanical properties i.e. tensile properties and tear strength of the reinforced polyisoprene were compared with those of the typical silica filled polyisoprene with and without TESPT. "... 

Nanstad R K and Berggren R G (1993), Effects of irradiation temperature on Charpy and tensile properties of high-copper, low upper-shelf, submerged-arc welds, pp. 239-267 in Effects of Radiation on Materials 16th International Symposium, ASTM STP1175, A S Kumar, D S Gelles, R K Nanstad, and E A Little, eds, American Society for Testing and Materials, Philadelphia, PA. 

Polymeric films have been prepared under UV radiation of urethane acrylate combined with functional monomers used as reactive diluents. Amount of photoinitiator (Irgacure 184) and radiation does intensity were optimized UV-cured films were characterized by film hardness, gel content, and tensile properties these properties were correlated with glass transition temperatures (Tg) of the polymer films. The Tg of the film was caleulated by using the Fox equation. Effect of comonomer diluents on these properties also was investigated in light of the changed Tg values of the polymeric films prepared in he presence of co-diluent. 

Heavy ion irradiation of PMMA has also received some attention, particularly by researchers at the Japan Atomic Energy Research Institute. Kudoh and co-workers (269-273) have compared the effects of y radiation and electron beams with those for 30 and 45 MeV protons and heavier ion beams on the tensile and molecular weight properties of PMMA. They have found no difference between the sensitivities of the tensile properties of PMMA to y-rays and electron and proton beams as a function of dose. However, the molecular weight dependence for PMMA showed a clear LET dependence for heavy ions above a critical LET, indicating overlapping between spurs. For low LET radiation the scission probability remains constant, but the scission probability decreases with increasing LET for high LET radiation. The critical LET level for PMMA is a few hundred MeV cm /g. 

The changes in microstructure observed under irradiation in FM steels (described in previous sections) result in significant changes in mechanical properties depending on the irradiation temperature and total irradiation dose. Two papers provide an in-depth reviews of previous results on the effects of irradiation on the mechanical properties in FM steels [48,88]. The following sections summarize the effects of radiation on irradiation creep, tensile properties, and fracture toughness. 

In air, PTFE has a damage threshold of 200—700 Gy (2 x 10 — 7 x 10 rad) and retains 50% of initial tensile strength after a dose of 10" Gy (1 Mrad), 40% of initial tensile strength after a dose of 10 Gy (10 lad), and ultimate elongation of 100% or more for doses up to 2—5 kGy (2 X 10 — 5 X 10 rad). During irradiation, resistivity decreases, whereas the dielectric constant and the dissipation factor increase. After irradiation, these properties tend to return to their preexposure values. Dielectric properties at high frequency are less sensitive to radiation than are properties at low frequency. Radiation has veryHtde effect on dielectric strength (86). 

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