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Author: Jake Benzing Publisher: ISBN: Category : Liquid helium Languages : en Pages : 0
Book Description
In the framework of a collaborative project between ASME, NASA, and NIST, quasi-static fracture toughness tests have been performed at liquid nitrogen temperature (77 K, or -196 C) and liquid helium temperature (4 K, or -269 C) on weld specimens extracted from the centers of four 316L welded stainless steel plates, each produced by a different vendor. Although the plates were produced in accordance with the same specifications from the same material (316L), large differences in fracture toughness have been observed, with the best weld (W2) exhibiting twice the critical toughness of the worst (W1) at 77 K, and more than seven times the critical toughness of W1 at 4 K. The Charpy absorbed energies recorded at 77 K for three of the welds within the same project were found to be strongly linearly correlated with fracture toughness at both test temperatures. The exception was weld W4, which provided the highest impact toughness and the second lowest quasi-static fracture toughness (stable crack initiation and resistance to crack propagation).
Author: Jake Benzing Publisher: ISBN: Category : Liquid helium Languages : en Pages : 0
Book Description
In the framework of a collaborative project between ASME, NASA, and NIST, quasi-static fracture toughness tests have been performed at liquid nitrogen temperature (77 K, or -196 C) and liquid helium temperature (4 K, or -269 C) on weld specimens extracted from the centers of four 316L welded stainless steel plates, each produced by a different vendor. Although the plates were produced in accordance with the same specifications from the same material (316L), large differences in fracture toughness have been observed, with the best weld (W2) exhibiting twice the critical toughness of the worst (W1) at 77 K, and more than seven times the critical toughness of W1 at 4 K. The Charpy absorbed energies recorded at 77 K for three of the welds within the same project were found to be strongly linearly correlated with fracture toughness at both test temperatures. The exception was weld W4, which provided the highest impact toughness and the second lowest quasi-static fracture toughness (stable crack initiation and resistance to crack propagation).
Author: Timothy Weeks Publisher: ISBN: Category : Liquid helium Languages : en Pages : 0
Book Description
Based on the collaborative framework established between ASME, NASA, and NIST, quasi-static tensile tests were performed in liquid nitrogen (77 K) and liquid helium (4 K) on tensile specimens extracted from the centers of four welded 316L stainless steel plates, each produced by a different vendor. Relatively large differences in strength, elongation, and reduction in area were observed between the welds with the strongest two welds (W4 and W2) exhibiting a nearly 20 % difference in 4 K ultimate tensile strength when compared to the welds with the lowest 4 K tensile strength (W1 and W3). As the testing temperature decreases from 77 K to 4 K, all welds exhibit an increase in yield strength, plus an attenuation in total elongation and reduction in area. Serrated yielding was observed at every test conducted at 4 K. The tensile properties reported in this work will be used during analysis of future fracture toughness (single edge notch bending) testing conducted at 77 K and 4 K on the same four sets of welded plates.
Author: F.R. Fickett Publisher: Springer Science & Business Media ISBN: 1475790503 Category : Science Languages : en Pages : 460
Book Description
The ninth International Cryogenic Materials Conference (ICMC) was held on the campus of the University of Alabama at Huntsville (UAH) in collaboration with the Cryogenic Engineering Conference (CEC) on June 11-14, 1991. The continuing bond between these two major conferences in the field of cryogenics is indicative of the extreme interdependence of their subject matter. The major purpose of the conference is sharing of the latest advances in low temperature materials science and technology. However, the many side benefits which accrue when this many experts gather, such as identification of new research areas, formation of new collaborations which often cross the boundaries of both scientific discipline and politics, and a chance for those new to the field to meet the old-timers, may override the stated purpose. This 1991 ICMC was chaired by F. R. Fickett of the National Institute of Standards and Technology. K. T. Hartwig, of Texas A&M served as Program Chairman with the assistance of eleven other Program Committee members. We especially appreciate the contributions of the CEC board and its Conference Chairman, J. Hendricks of Alabama Cryogenic Engineering, to the organization. of this joint conference. UAH hosted the conference. The local arrangements and management, under the watchful eye of Ann Yelle and Mary Beth Magathan of the UAH conference staff, were excellent. Participation in the CEC/ICMC continues to exceed expectations with 650 registrants for the combined conference.
Author: R.W. Fast Publisher: Springer Science & Business Media ISBN: 1461335426 Category : Technology & Engineering Languages : en Pages : 904
Book Description
The Fourth International Cryogenic Materials Conference (ICMC) was held in San Diego, California in conjunction with the Cryogenic Engineer ing Conference (CEC) on August 10-l4, 1981. The synergism produced by conducting the two conferences together remains very strong. In the ap pl1cation of cryogenic technology, materials continue to be a demanding challenge, and sometimes, an obstacle. The association of materials and cryogenic engineers increases their awareness of recent research in each other's fields and influences the course of future research. Many contributed to the success of the 1981 conference. J. W. Morris of the University of California--Berkeley was ICMC Conference Chairman. E. N. C. Dalder of Lawrence Livermore Laboratories was ICMC Structural Program Chairman; D. C. Larbalestier of the University of Wisconsin- Madison, and D. K. Finnemore of Iowa State University were Superconducting Materials Program Chairmen. Local arrangments were expertly coordinated by R. E. Tatro of General Dynamics--San Diego. The CEC Board, especia11y their conference chairman, T. M. Flynn, of the National Bureau of Stan dards, Boulder, contributed very substantia1ly to conference planning and implementation. All of their efforts provided the foundation of the largest CEC/ICMC ever. We thank the Office of Naval Research and the Office of Fusion Energy and Basic Energy Sciences of the Department of Energy for providing needed financial support for the conference. Fina11y, we especially thank M. Stieg, who prepared the papers for the new procedures and format used in this volume.
Author: A. F. Clark Publisher: Springer Science & Business Media ISBN: 1461398592 Category : Science Languages : en Pages : 715
Book Description
The Third International Cryogenic Materials Conference (ICMC) was held in Madison, Wisconsin, in conjunction with the Cryogenic Engineering Conference (CEC) in August 1979. The University of Wisconsin hosted the two conferences in an excellent manner and deserves special recognition and praise. The synergism produced by conducting the two conferences simultaneously continues to be strong. Materials remain a demanding challenge and, in some cases, an obstacle to effective application of cryogenic technology. The association of materials specialists and cryogenic engineers every other year centers their attention on the most needed areas of research. The present ICMC Board met during the conference and elected two new members, E. W. Collings (U. S.) and D. Evans (England). The board voted to conduct two smaller, special-topic conferences in 1980. These are Filamentary A15 Superconductors, which was held at Brookhaven National Laboratories, Upton, New York in May 1980, and Fundamentals of Nonmetallics and Composites at Low Temperatures, held in Geneva, Switzerland in August 1980. The 1981 CEC/ICMC will be held August 10 through 14 in San Diego, California.
Author: ASM International. Handbook Committee Publisher: ASM International(OH) ISBN: Category : Technology & Engineering Languages : en Pages : 1334
Book Description
These volumes cover the properties, processing, and applications of metals and nonmetallic engineering materials. They are designed to provide the authoritative information and data necessary for the appropriate selection of materials to meet critical design and performance criteria.
Author: Jake Benzing
Author: Jake Benzing
Author: Timothy Weeks
Author: 
Author: F.R. Fickett
Author: R.W. Fast
Author: 
Author: 
Author: G. M. Goodwin
Author: A. F. Clark
Author: ASM International. Handbook Committee