Application of initial value method in the static analysis of laterised concrete cylindrical shells under hydrostatic loading

2012 ◽  
Vol 3 (4) ◽  
pp. 229
Author(s):  
Theresa Ukamaka Nwakonobi ◽  
N.N. Osadebe ◽  
C.C. Mbajiorgu
Keyword(s):  
Static Analysis ◽  
Cylindrical Shells ◽  
Initial Value ◽  
Hydrostatic Loading

scholarly journals Detecting Uninitialized Variables in C++ with the Clang Static Analyzer

2020 ◽  
Author(s):  
Kristóf Umann ◽  
Zoltán Porkoláb
Keyword(s):  
Software Engineering ◽  
Open Source ◽  
Programming Languages ◽  
Static Analysis ◽  
Common Source ◽  
Initial Value ◽  
Analysis Techniques ◽  
Specific Variable ◽  
Prototype Tool ◽  
Run Time

Uninitialized variables have been a source of errors since the beginning of software engineering. Some programming languages (e.g. Java and Python) will automatically zero-initialize such variables, but others, like C and C++, leave their state undefined. While laying aside initialization in C and C++ might be a performance advantage if an initial value can't be supplied, working with such variables is an undefined behavior, and is a common source of instabilities and crashes. To avoid such errors, whenever meaningful initialization is possible, it should be used. Tools for detecting these errors run time have existed for decades, but those require the problematic code to be executed. Since in many cases the number of possible execution paths are combinatoric, static analysis techniques emerged as an alternative. In this paper, we overview the technique for detecting uninitialized C++ variables using the Clang Static Analyzer, and describe various heuristics to guess whether a specific variable was left in an undefined state intentionally. We implemented a prototype tool based on our idea and successfully tested it on large open source projects.

Static analysis of cylindrical shells by using B spline functions

1987 ◽  
Vol 25 (6) ◽  
pp. 809-816 ◽  
Author(s):  
Peng-Cheng Shen ◽  
Jian-Guo Wang
Keyword(s):  
Static Analysis ◽  
Cylindrical Shells ◽  
Spline Functions ◽  
B Spline

Static and Dynamic Buckling of Pressure-Loaded, Ring-Stiffened Cylindrical Shells

1983 ◽  
Vol 27 (02) ◽  
pp. 113-120
Author(s):  
G. J. Simitses ◽  
I. Sheinman
Keyword(s):  
Static Analysis ◽  
Limit Point ◽  
Cylindrical Shells ◽  
Applied Pressure ◽  
Dynamic Loads ◽  
Static Loads ◽  
Critical Dynamic ◽  
The Subject ◽  
Circular Cylindrical Shells ◽  
Stiffened Cylindrical Shells

The analysis of imperfect, stiffened, thin circular cylindrical shells, subjected to suddenly applied pressure, is presented. Moreover, a solution scheme for the complete (including post-limit point behavior) static analysis is described. The concept of dynamic stability is discussed for suddenly loaded structures. In addition, a fairly complete review of the reported works on the subject is presented. Results are presented for a ring-stiffened geometry. These include critical dynamic loads, critical static loads (limit point loads), as well as minimum post-limit point loads.

The Influence of the Deformation Nonlinearity on Stress Concentration in Cylindrical Shells with Holes under Torsion

2019 ◽  
Vol 968 ◽  
pp. 548-559
Author(s):  
А. Kolodiazhnyi ◽  
Margarita Mednikova
Keyword(s):  
Stress Concentration ◽  
Static Analysis ◽  
Cylindrical Shells ◽  
Geometrical Nonlinearity ◽  
Nonlinear Static Analysis ◽  
External Loading ◽  
Geometrical Parameters ◽  
Torsion Moment ◽  
Space Rocket ◽  
Wide Range

Circular cylindrical shells, application of which is widely widespread in a space-rocket technique and aircraft building, often have cutouts on the surface on structural and technological terms. The feature of the stress-strain state, when a circular hole is introduced into the shell, is the appearance of stress concentration zones, in which stress can be increased in many times. The linear static analysis often used for determination of maximal stresses in such elements of constructions does not reflect character of stresses change with increasing of the external loading. The results of Finite-Elements nonlinear static analysis of the stresses concentration caused by the hole presence depending on the size of torsion moment increasing from zero to the maximal values are presented in this article. The parametric analysis for the wide range of shells lengths and hole radii is carried out, at which different combinations the dependences of stresses concentration factor (SCF) on the value of torsion moment on all range of loading are defined. It is shown that the stresses fields, unlike the linear model of deformation, transform in the loading process. SCF obtained by taking into account the geometrical nonlinearity of deformation depends not only on the geometrical parameters of the considered sample, but also on the level of loading. There are two types of behavior of SCF dependence on the loading level and on the structure parameters. The SCF increases continuously in the first half of loading range. In the second half in case of the small holes the monotonous growth proceeds to the maximal values, and for the large holes ‒ SCF can fall at load increasing, and sometimes has the repeated areas of intensive growth in the pre-ultimate state.

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