scholarly journals Finite element analysis of surface cracks by the supercomputer. 2nd report Elastic-plastic analysis of surface cracks.

1987 ◽  
Vol 53 (486) ◽  
pp. 255-260 ◽  
Author(s):  
Toshiro MIYOSHI ◽  
Yuichiro YOSHIDA
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Surface Cracks ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Plastic Analysis

The Application of ABAQUS in Cast-Steel Joints Elastic-Plastic Analysis

2013 ◽  
Vol 351-352 ◽  
pp. 854-859 ◽  
Author(s):  
Fan Wang ◽  
Zhi Feng Luo ◽  
Sheng Hao Mo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cast Steel ◽  
Element Analysis ◽  
Elastic Plastic ◽  
The Finite Element Analysis ◽  
Plastic Analysis ◽  
Reticulated Shell Structure ◽  
Steel Joints ◽  
Cast Steel Joint

The article introduces the application of the large universally used finite element analysis software ABAQUS in elastic-plastic analysis of the cast-steel joints in building structure. Using the cast-steel joint of a large reticulated shell structure in Shenzhen as an example, the article explains how to import the joint model into ABAQUS and start the finite element analysis, and finally get the elastic-plastic analysis results, thus provide the reference for engineering design, analysis and optimize design of cast-steel joints.

Alternative Approaches for ASME Code Simplified Elastic-Plastic Analysis

2017 ◽  
Author(s):  
Sampath Ranganath ◽  
Nathan A. Palm
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Correction Factor ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Asme Code ◽  
Alternative Approaches ◽  
Fatigue Evaluation ◽  
Technical Basis

Subsection NB, Section III of the ASME Code provides rules for the fatigue evaluation of nuclear pressure vessel and piping components. The stress analysis in ASME code evaluation is generally based on linear elastic analysis. Simplified rules using an elastic-plastic strain correction factor, Ke, are provided in Section III to account for plastic yielding when the primary plus secondary stress intensity range exceeds the 3Sm limit. While the simplified elastic-plastic analysis rules are easy to apply and do not require nonlinear analysis, the application of the Ke correction factor can produce extremely conservative results. This paper investigates different analytical methods that are available for simplified elastic-plastic analysis and proposes an alternative method that is not overly conservative (compared to the Code Ke) and offers a more realistic approach to simplified elastic-plastic analysis. The proposed methodology is applicable for both vessel (NB-3200), core support structures (NG-3200) and piping components (NB-3600) and does not require new finite element analysis. Information in existing ASME Code stress reports should be sufficient to determine the new Ke factor. The proposed methodology is applicable to structural materials including austenitic stainless steel and nickel based alloys, carbon steel and low alloy steel. Comparison of the proposed methodology with detailed elastic-plastic finite element analysis shows that the new Ke factors are conservative but offer relief from the excessive conservatism in the Code Ke values. This paper provides the technical basis for an ASME draft Code Case for Alternative Approaches for ASME Code Simplified Elastic-plastic Analysis being pursued through the Section III ASME Code Committees.

Overview of Code Case on Alternative Design Methodology by Using Elastic-Plastic Finite Element Analysis for Class 1 Vessels in the JSME Rules on Design and Construction

2010 ◽  
Author(s):  
Seiji Asada ◽  
Takashi Hirano ◽  
Tetsuya Nagata ◽  
Naoto Kasahara
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Methodology ◽  
Evaluation Method ◽  
Plastic Collapse ◽  
Element Analysis ◽  
Alternative Design ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Design And Construction

An alternative design methodology by using elastic-plastic finite element analysis has been developed and published as a code case of the JSME Rules on Design and Construction for Nuclear Power Plants (The First Part: Light Water Reactor Structural Design Standard). This code case applies elastic-plastic analysis to evaluation of such failure modes as plastic collapse, shakedown, thermal ratchet and fatigue. Advantages of this evaluation method are no use of stress linearization/classification, consistent use of Mises equivalent stress and applicability to complex 3-dimentional structures which are hard to be treated by the conventional stress classification method. The evaluation method for plastic collapse consists of the Lower Bound Approach Method, Twice-Elastic-Slope Method and Elastic Compensation Method. Cyclic Yield Area (CYA) criterion based on elastic analysis is applied to screening evaluation of shakedown limit instead of secondary stress evaluation, and elastic-plastic analysis is performed when the CYA screening criterion is not satisfied. Strain concentration factors can be directly calculated based on elastic-plastic analysis.

Development of J-Integral Solutions for Semi-Elliptical Circumferential Cracked Pipes Subjected to Internal Pressure and Bending Moment

2015 ◽  
Author(s):  
Makoto Udagawa ◽  
Jinya Katsuyama ◽  
Yoshihito Yamaguchi ◽  
Yinsheng Li ◽  
Kunio Onizawa
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Loading Condition ◽  
Bending Moment ◽  
J Integral ◽  
Surface Cracks ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Piping Systems ◽  
Integral Solutions

The J-integral solutions for cracked pipes are important in crack growth calculation and failure evaluation based on the elastic-plastic fracture mechanics. One of the most important crack types in structural integrity assessment for nuclear piping systems is circumferential semi-elliptical surface crack on the inside of the pipes. Although several J-integral solutions have been provided, no solutions were developed at both the deepest and the surface points of circumferential semi-elliptical surface cracks in pipes. In this study, with backgrounds described above, the J-integral solutions of circumferential semi-elliptical surface cracks on the inside of the pipe were developed by numerical finite element analyses. Three dimensional elastic-plastic analyses were performed considering different material properties, pipe sizes, crack dimensions and, especially, combined loading condition of internal pressure and bending moment which is a typical loading condition for nuclear piping systems. The J values at both the deepest and the surface points were extracted from finite element analysis results. Moreover, in order to benefit users in practical applications, a pair of convenient J-integral estimation equations were developed based on the calculated J values at the deepest and the surface points. Finally, the accuracy and applicability of the convenient equations were confirmed by comparing with the provided stress intensity factor solutions in elastic region and with finite element analysis results in elastic-plastic region.

Thermal Elastic-Plastic Stress Analysis of Structural Elements With Creep

2005 ◽  
Author(s):  
R. Sarala ◽  
B. Sutharson ◽  
D. Jaya Kanth
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Analysis ◽  
Kinematic Hardening ◽  
Transient State ◽  
Structural Elements ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Plastic Stress

Finite element analysis of thermo-mechanical problems is reported here. From the literature, it may be seen that the thermal-elastic plastic analysis of structural elements has continued to remain a research topic for a couple of decades. No one computationally verified the thermal elastic plastic stress analysis with creep using triangular elements or quadrilateral elements. Finite element analysis code TSAP (Thermal Structural Analysis Programme) was developed in FORTRAN to handle the elastic-plastic stress analysis on two-dimensional planar or three dimensional axisymmetry structures subjected to combined thermal and mechanical loads. In this work, thermo elastic plastic analysis is extended to creep support. A triangular or quadrilateral element has been used to analysis of structures with inclusion of creep. The formulation is based on isotropic or kinematic hardening rule. The validation checks on the program are carried out using results available in the literature. The parameters are considered while analyses are (1.) Type of materials used (2.) Type of elements used (3.) Structure geometry (axisymmetry, plane stress or plane strain) (3.) Type of analysis (steady state or transient state) (4.) Type of loading (5.) Various boundary conditions (conductive or heat flux boundary) (6.) Effect of creep inclusion.

A Simplified Approach on the Elastic-Plastic Analysis of Threaded Connectors

1986 ◽  
Vol 108 (1) ◽  
pp. 15-19
Author(s):  
L. Y. Chen ◽  
M. R. Williams
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Analysis ◽  
Element Analysis ◽  
Manufacturing Costs ◽  
Simplified Approach ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Improve Cost Effectiveness ◽  
Improve Cost

The design of threaded connectors based on an elastic analysis appears overly conservative. This, in turn, will result in unnecessary material and manufacturing costs. To improve cost effectiveness, the design of connectors from the elastic-plastic viewpoint is warranted. This paper presents a simplified approach on the elastic-plastic finite element analysis of connectors. This approach would save tremendous computer costs which may be incurred in conducting a regular elastic-plastic analysis of threaded connectors.

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