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Kumagai, Tomohisa*; Miura, Yasufumi*; Miura, Naoki*; Marie, S.*; Almahdi, R.*; Mano, Akihiro; Li, Y.; Katsuyama, Jinya; Wada, Yoshitaka*; Hwang, J.-H.*; et al.
Journal of Pressure Vessel Technology, 144(1), p.011509_1 - 011509_18, 2022/02
Times Cited Count：1 Percentile：20.34(Engineering, Mechanical)To predict fracture behavior for ductile materials, some ductile fracture simulation methods different from classical approaches have been investigated based on appropriate models of ductile fracture. For the future use of the methods to overcome restrictions of classical approaches, the applicability to the actual components is of concern. In this study, two benchmark problems on the fracture tests supposing actual components were provided to investigate prediction ability of simulation methods containing parameter decisions. One was the circumferentially through-wall and surface cracked pipes subjected to monotonic bending, and the other was the circumferentially through-wall cracked pipes subjected to cyclic bending. Participants predicted the ductile crack propagation behavior by their own approaches, including FEM employed GTN yielding function with void ratio criterion, are FEM employed GTN yielding function, FEM with fracture strain or energy criterion modified by stress triaxiality, XFEM with J or delta J criterion, FEM with stress triaxiality and plastic strain based ductile crack propagation using FEM, and elastic-plastic peridynamics. Both the deformation and the crack propagation behaviors for monotonic bending were well reproduced, while few participants reproduced those for cyclic bending. To reproduce pipe deformation and fracture behaviors, most of groups needed parameters which were determined toreproduce pipe deformation and fracture behaviors in benchmark problems themselves and it is still difficult to reproduce them by using parameters only from basic materials tests.
Yamada, Tomonori; Nagashima, Toshio*
Nihon Keisan Kogakkai Rombunshu (Internet), 2009(6), 7 Pages, 2009/03
An integration scheme for finite elements on the boundary of analysis domain in structured finite element analysis is proposed in this paper. In structured finite element analysis, the structured grid is adopted as finite elements and the inconsistency between boundary of finite elements and that of analysis domain occurs. In this paper, Newton-Cotes integration technique with sub-cell evaluation of integration region is proposed and efficient integration of element stiffness matrices on the boundary of analysis domain is achieved.
Hidaka, Akihide; Maruyama, Yu; Shibazaki, Hiroaki*; Maeda, Akio; Harada, Yuhei; *; Yoshino, T.*; Sugimoto, Jun
JAERI-Tech 98-026, 83 Pages, 1998/07
no abstracts in English
Hidaka, Akihide; Sugimoto, Jun; Muramatsu, Ken; *; *
PSA95: Proc. of Probabilistic Safety Assessment Methodology and Applications, 1, p.241 - 246, 1995/00
no abstracts in English
Yamada, Tomonori; Nagashima, Toshio*
no journal, ,
A simple and efficient integration scheme for finite elements on the boundary of analysis domain in structured finite element analysis is presented. In structured finite element analysis, the structured grid is adopted as finite elements and the inconsistency between boundary of finite elements and that of analysis domain occurs. A hybrid Newton-Cotes integration technique is proposed and efficient integration of element stiffness matrices on the boundary of analysis domain is achieved.
