By D. R. Hayhurst (auth.), S. Murakami, N. Ohno (eds.)
The introduction of steam generators and the unexpected upward thrust of steam temperature at the start of the 20 th century gave a very good impetus to the beginning of clinical learn on steel creep and high-temperature power. Then aeronautical and aerospace exploitation within the 1940's and 1950's enlarged the scope of creep study. during this context, the 1st IUTAM Symposium on "Creep in constructions" was once held at Stanford collage in July 1960, and approximately 60 members from seven international locations worldwide mentioned their contemporary effects in this challenge. next innovation in technology and know-how, as in nuclear and new strength expertise, new fabrics, huge scale integration of semiconductors etc., has claimed strategies to new and demanding difficulties during this basic box of utilized mechanics. which will talk about the hot themes during this self-discipline, the IUTAM Symposia "Creep in constructions" thereafter were held each ten years; i.e. the second one in 1970 at Gothenburg, Sweden, the 3rd in 1980 at Leicester, U.K. and the fourth in 1990 at Cracow,Poland. the 1st (1960) and moment Symposium (1970) have been involved quite often with the phenomenological legislations of creep and creep research of structural parts, while the problems of the 3rd Symposium (1980) shifted towards the issues of creep harm, creep crack progress, sensible and powerful layout tools, etc.
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Extra info for IUTAM Symposium on Creep in Structures: Proceedings of the IUTAM Symposium held in Nagoya, Japan, 3–7 April 2000
The effects of the lamellar structure can best be studied with so called polysynthetically twinned (PST) crystals of TiAI. These are singlecrystals with lamellar structure (Fujiwara et al. 1990). A detailed investigation of the creep behavior of PST TiAI at 877°C and 200 MPa has been reported by Wegmann et al. (2000). It has been shown that PST orientations with their lamellae parallel or perpendicular to the loading axis (hard mode orientations) exhibit longer creep lives and lower minimum creep rates than soft oriented PST specimens.
8(b). 8(b). It is significant that deviations between experimental and computed data in both loading modes are self consistent: an inadequate strain acceleration in the later stages of tertiary manifesting itself as an insufficient stresssoftening. 9. They confmn the behaviour 6OOr--7==::=======::~ '" ~" Co ~ 300 e ,;;; 200 ~~ . _. _.. _. _. :. :.. :. :.. '~ " l xlO -10s l 2 4 6 8 10 Total Engineering Strain / % Figure 9. s. using the parameter-set in Table 2. r. data Model peak tensile stress "'" 10-' 10-1• 100 \ Expe rimental 150 200 300 400 500 600 Stress / MPa Figure 10.
L xlO -10s l 2 4 6 8 10 Total Engineering Strain / % Figure 9. s. using the parameter-set in Table 2. r. data Model peak tensile stress "'" 10-' 10-1• 100 \ Expe rimental 150 200 300 400 500 600 Stress / MPa Figure 10. Illustrating the predicted reciprocity between minimum creep rate/applied stress and peak stress/applied straining rate. found for Nimonic 101 except that the post-peak softening is less strong in this alloy than in Nimonic 101. Particle-coarsening has little significant effect on softening rates at this temperature until the straining rate falls below about 10-8 S-I.