Academic literature on the topic 'KSIG (Computer program)'

The U-tubes installed inside the steam generator experience high temperature and pressure as a role of heat transfer. Specially, during the secondary side hydrostatic test which ensures the integrity of steam generator, the U-tube is subjected to high external pressure. The purpose of this paper is to investigate the allowable external pressure of the U-tube in steam generator. In the ASME B&PV Code Section III [1], the allowable external pressure is determined by the rules of NB-3133. Alternatively, NB-3228 analysis may be applied. In order to determining the allowable external pressure of steam generator tube, the buckling analysis is performed. The analysis consists of the collapse pressure and elastic instability pressure analyses. In this study, these pressures are determined by finite element analysis (FEA) using ANSYS computer program. The non-linear static analysis is performed with ideally elastic-plastic material properties for the collapse analysis. On the other hand, the elastic instability pressure is calculated by eigenvalue analysis in elastic range. These allowable pressures are found to be 24.1 ksi and 10.5 ksi. Therefore the lower pressure of 24.1 ksi is the allowable external pressure of tube. In addition, the results of analysis are compared with other research [6] and Det Norske Veritas (DNV) offshore standards [11]. In conclusion, the results of buckling analysis are well matched with other research [6] and standard [11]. For steam generator tubes, the collapse pressure is dominant factor in failure. Also, the collapse pressure is largely influenced by the ovality of tube.

QuesTek Innovations LLC will present an overview of its Ferrium® C61™ and Ferrium C64™ high-performance gear steels. QuesTek designed, developed and implemented these two new steels using its Materials by Design® technology, an “Integrated Computational Materials Engineering” (ICME)-type approach. Both steels are commercially available (Ferrium C61 falls under Aerospace Materials Specification [AMS] number 6517 and Ferrium C64 falls under AMS 6509) and both can significantly reduce rotorcraft weight and manufacturing costs while increasing operational robustness (including gear steel oil-out/high temperature survivability). Ferrium C61 and C64 are new high strength, secondary hardening gear steels that offer different levels of case hardness. These highly-processable steels exhibit excellent hardenability, and were explicitly designed to leverage the advantages of high-temperature vacuum carburization. Ferrium C61 (AMS 6517) exhibits both excellent surface fatigue and core properties (225 ksi yield strength, 240 ksi ultimate tensile strength, 130 ksi•?in fracture toughness), and is a good candidate for integral gear/shaft applications where maximum torque transfer with minimum weight is tantamount. Ferrium C64 (AMS 6509) exhibits excellent surface hardness (62+ HRC after vacuum carburization), with the potential for significantly better surface fatigue performance as compared to incumbent gear steels such as AISI 9310 (AMS 6265) and Pyrowear® Alloy 53 (AMS 6308). The final tempering temperatures of both C61 and C64 (482–510°C) are 200–300°C higher than most incumbent gear steels, providing excellent scoring resistance and superior thermal stability in high-temperature environments and “oil-out” emergency conditions. Rotorcraft applications underway include an evaluation of C64 by Bell Helicopter under the U.S. Army Future Advanced Rotorcraft Drive Systems (FARDS) program, and of C61 for the forward rotorshaft of Boeing’s CH-47 Chinook under a U.S. Army Small Business Innovation Research (SBIR) Phase II project.