scholarly journals High consistency forming process for paper making. Part 1. A research, development, and demonstration program plan for the US Papermaking Industry. Final report

1980 ◽  
Author(s):  
Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 503
Author(s):  
Yuheng Zhang ◽  
Zhiqing Hu ◽  
Liming Guo

In order to study a new thread rolling forming process from a microscopic perspective, a polycrystalline model was established, based on the crystal plasticity finite element method (CPFEM) and Voronoi polyhedron theory. The fluidity of metals was studied to explain the reason for the concave center. The simulation results show that the strain curve of the representative element can more truly reflect the deformation behavior of the material. The grain orientations after deformation are distributed near the initial orientation. The evolution of each slip system is determined by the initial grain orientations and grain locations. The pole figures obtained from the experiment show high consistency with the pole figures obtained by simulation, which verifies the accuracy of the texture prediction by CPFEM. The experimental results show that thread rolling is more uniform in deformation than ordinary rolling.


1963 ◽  
Author(s):  
J. C. Hindmarch ◽  
R. V. Smith

2002 ◽  
Vol 46 (1) ◽  
Author(s):  
Mia Gray

Many accounts of firm behavior in geography today suffer from a simplified theory of the firm. Many theories treat the firm as a unified entity with one overarching strategy. These theories have difficulty explaining how firms construct strategy around issues such as location, partnering, and outsourcing and how they make decisions about different corporate activities (research, development, manufacturing, and marketing). I argue that firms in emerging industries behave in a much more complex fashion than is usually theorized. Understanding firm decisions on structure, behavior and location depends on the recognition that firm strategy differs for each corporate activity. I argue that one way around the limitations of the conventional approach is to break down the firm into development, production, and realization processes and understand the requirements and opportunities for each separate activity. By following innovative products in the US drug industry (pharmaceuticals and biotechnology), I develop a micro-level, activity-specific, theory of the firm.


Author(s):  
Makoto Higuchi

Many studies on the environmental fatigue of structural materials in LWR (Light Water Reactor) water have been carried out over the past 30 years. Early environmental fatigue tests were mainly carried out in Japan in the 1980s, and these results were reported to the ASME in 1988. After that, O. Chopra and W. Shack of ANL (Argonne National Laboratory) also carried out similar fatigue tests and reported that their data corresponded well to Japanese data. In the US, the PVRC (Pressure Vessel Research Council) started the CLEE Committee (Cyclic Life and Environmental Effect, Chair: Sumio Yukawa) for developing the environmental fatigue evaluation method in LWR water under the request from the ASME in 1991. This committee continued for 13 years and closed in 2004 after publishing the final report as WRC (Welding Research Council) Bulletin 487. After 1990 in Japan, the EFD Project (1993–1995) and the EFT Project (1994–2006) were carried out under the collaboration of electric utilities, plant vendors and government. A large number of environmental fatigue data have been generated in these projects, and these were offered to the US through the CLEE Committee. Based on Japanese and US fatigue data, environmental fatigue evaluation methods have been established in both countries that assess the effects of some parameters on fatigue life reduction in LWR water environments. This paper introduces the history of studies on the environmental fatigue in LWR water and the contributions of Sumio Yukawa to these activities. After that, the comparison of three major methods of environmental fatigue evaluation such as PVRC, JSME and MJREG/CR-6909 are reported.


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