Sensitivity Analysis for the Cylindrical Pressure Vessel of 16MnR Steel with the Monte-Carlo Method

2011 ◽  
Vol 689 ◽  
pp. 419-424
Author(s):  
Jun Li ◽  
Zheng Zhang
Keyword(s):  
Sensitivity Analysis ◽  
Monte Carlo ◽  
Failure Probability ◽  
Pressure Vessel ◽  
Safety Assessment ◽  
Film Stress ◽  
Assessment Procedure ◽  
The Monte Carlo Method ◽  
Cylindrical Pressure Vessel ◽  
Input Parameters

Probabilistic safety assessment procedure is used to evaluate the cylindrical pressure vessel of 16MnR steel, which regards defect sizes, mechanical properties and stresses as random variables. Monte-Carlo simulation is applied on calculating failure probability, which is based on the Chinese safety assessment procedure (GB/T 19624-2004). Sensitivity analysis is performed to estimate the effect of change in input parameters. The results show that failure probability may be influenced significantly by change in parameters concerning yield strength and film stress. Additionally, the different distributions of input parameters have an effect on failure probability.

An Improved FOSM Method for Calculating the Failure Probability of Welded Pipes with Cracks

2004 ◽  
Vol 261-263 ◽  
pp. 561-566
Author(s):  
Li Xing Huo ◽  
Min Liu ◽  
You Feng Zhang ◽  
Fang Juan Qi
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Failure Probability ◽  
Safety Assessment ◽  
Linear Expansion ◽  
Failure Function ◽  
The Monte Carlo Method

To increase the accuracy of R-F method, it is necessary to solve the problems of the linear expansion of failure function and non-normal variables. In this paper, the improved FOSM method was applied to calculate the failure probability of welded pipes with cracks. The examples show that this method is simple, efficient and accurate for reliability safety assessment of welded pipes with cracks. It can save more time than the Monte Carlo method does, so that the improved FOSM method is recommended for general engineering reliability safety assessment of welded pipes with cracks.

Calculation of Working Pressure for Cylindrical Vessel Under External Pressure

2010 ◽  
Author(s):  
Gurinder Singh Brar ◽  
Yogeshwar Hari ◽  
Dennis K. Williams
Keyword(s):  
Monte Carlo ◽  
Cylindrical Shell ◽  
Pressure Vessel ◽  
External Pressure ◽  
Working Pressure ◽  
Geometric Imperfections ◽  
The Monte Carlo Method ◽  
Cylindrical Pressure Vessel ◽  
Section Viii ◽  
Initial Geometric Imperfections

Initial geometric imperfections have a significant effect on the load carrying capacity of asymmetrical cylindrical pressure vessels. This research paper presents a comparison of a reliability technique that employs a Fourier series representation of random asymmetric imperfections in a defined cylindrical pressure vessel subjected to external pressure. Evaluations as prescribed by the ASME Boiler and Pressure Vessel Code, Section VIII, Division 2 rules are also presented and discussed in light of the proposed reliability technique presented herein. The ultimate goal of the reliability type technique is to statistically predict the buckling load associated with the cylindrical pressure vessel within a defined confidence interval. The example cylindrical shell considered in this study is a fractionating tower for which calculations have been performed in accordance with the ASME B&PV Code. The maximum allowable external working pressure of this tower for the shell thickness of 0.3125 in. is calculated to be 15.1 psi when utilizing the prescribed ASME B&PV Code, Section VIII, Division 1 methods contained within example L-3.1. The Monte Carlo method as developed by the current authors and published in the literature is then used to calculate the maximum allowable external working pressure. Fifty simulated shells of geometry similar to the example tower are generated by the Monte Carlo method to calculate the nondeterministic buckling load. The representation of initial geometric imperfections in the cylindrical pressure vessel requires the determination of appropriate Fourier coefficients. The initial functional description of the imperfections consists of an axisymmetric portion and a deviant portion that appears in the form of a double Fourier series. Multi-mode analyses are expanded to evaluate a large number of potential buckling modes for both predefined geometries and the associated asymmetric imperfections as a function of position within a given cylindrical shell. The method and results described herein are in stark contrast to the dated “knockdown factor” approach currently utilized in ASME B&PV Code.

A Study on Degree of Conservatism of Two Safety Assessment Methods for Piping and Vessels With Defects

2019 ◽  
Author(s):  
Meng He ◽  
Haitao Li ◽  
Zhiyuan Han ◽  
Guoshan Xie ◽  
Liang Sun ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Failure Probability ◽  
Safety Assessment ◽  
Evaluation Method ◽  
Assessment Method ◽  
Pressure Vessels ◽  
Assessment Methods ◽  
Operating Pressure ◽  
Safety Factors ◽  
Straight Pipe

Abstract Flaws (defects), such as local thinning due to corrosion, inevitably exist in piping and pressure vessels. These defects can be evaluated using the fitness for service (FFS) method provided in the GB/T 19624 standard. Recently, the GB/T 35013 standard (Fitness-for-service assessment of pressure equipments), which provides another FFS assessment method for local thinning on piping and vessels, has been published. The evaluation method for local thinning in the GB/T 35013 standard is generally similar to that in the API 579-1/ASME FFS-1 (2016), but is totally different from that in the GB/T 19624. In this paper, the differences of the local thinning assessment methods in the GB/T 35013 (or API 579-1/ASME FFS-1 (2016)) and the GB/T 19624 are summarized, and the degree of conservatism comparisons between these standards are presented. The maximum allowable operating pressure (Prmax) that takes into account the effect of defects for straight pipe sections and vessels under different defect sizes and safety factors in these two standards have been calculated and compared. Monte Carlo simulations have been carried out to estimate the failure probability (Pf) and reliability of the straight pipe sections and vessels with different safety factors using the GB/T 19624.

Study of the Effect of Process Induced Uncertainties on the Performance of a Micro-Comb Resonator

2009 ◽  
Vol 147-149 ◽  
pp. 716-725 ◽  
Author(s):  
Irina Codreanu ◽  
Adam Martowicz ◽  
A. Gallina ◽  
Łukasz Pieczonka ◽  
Tadeusz Uhl
Keyword(s):  
Sensitivity Analysis ◽  
Monte Carlo Simulation ◽  
Finite Element ◽  
Monte Carlo ◽  
Mode Shapes ◽  
Computational Techniques ◽  
Simulation Methods ◽  
Input Parameters ◽  
Mobile Mass ◽  
Study Case

This paper presents a modeling technique based on the integration in the classic deterministic simulation methods of probabilistic computational techniques such as uncertainty analysis and sensitivity analysis. As study case, it is presented a micro-comb resonator that is actuated electrostatically to vibrate in the plane parallel to the substrate. A deterministic Finite Element coupled electromechanical analysis is performed to evaluate the mode shapes and the corresponding eigenfrequencies of the mobile mass and afterwards a Monte Carlo simulation is used to determine the dispersion of the eigenfrequency of the mode shape of interest in function of the variations of the input parameters. The scatter of the results is analyzed and then it is presented a sensitivity analysis for establishing which of the input parameters have more influence on the variability of the microresonators performance.

Probability and Sensitivity Analysis of Plate

2014 ◽  
Vol 617 ◽  
pp. 193-196 ◽  
Author(s):  
Katarina Tvrdá
Keyword(s):  
Sensitivity Analysis ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Flat Plate ◽  
Concrete Structures ◽  
Probability Analysis ◽  
Triangular Distribution ◽  
High Quality ◽  
Input Parameters ◽  
Concrete Solution

This paper deals with some problems of the ceiling plate, made of the Cobiax-system. Cobiax provides a system to produce voided, biaxial, flat plate slabs as a high-quality concrete solution for large spans and slim slabs. Plastic voids in the shape of spheres or flattened spheres are contained in steel cages and put into concrete structures to create longer spans and reduce vertical loads. The presented plate is made of cobiax balls with a diameter of 27 cm located outside the area of columns. Probability analysis of Monte-Carlo method in Ansys is presented. Input parameters are changing according to Gauss or triangular distribution.

Study on Reliability of Jacket Offshore Platform by Seismic Action Based on ANSYS

2010 ◽  
Vol 163-167 ◽  
pp. 3023-3028
Author(s):  
Qing Zhi Yan ◽  
Zhan Zhang ◽  
Liang Cui ◽  
Yan Hua Wang
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Failure Mode ◽  
Safety Assessment ◽  
Offshore Platform ◽  
Seismic Action ◽  
Structure Reliability ◽  
The Monte Carlo Method ◽  
Jacket Offshore Platform ◽  
Main Factor

Jacket Offshore Platform is a complex statically indeterminate structure, reliability of which is impacted by many factors, and the earthquake is a main factor. This paper simplify the significant failure mode of Jacket Offshore Platform by standard. Calculate the reliability of Jacket Offshore Platform under the effect of earthquake with the Monte Carlo method based on ANSYS. The result can provide evidence for safety assessment of Jacket Offshore Platform.

Sensitivity Analysis on the Detailed Plant Operational State for Shutdown PSA

2017 ◽  
Author(s):  
Daichi Shiota ◽  
Naoki Hirokawa ◽  
Kohei Hisamochi
Keyword(s):  
Sensitivity Analysis ◽  
Pressure Vessel ◽  
Nuclear Power ◽  
Safety Assessment ◽  
Power Plants ◽  
Primary Coolant ◽  
Level 1 ◽  
Periodic Inspections ◽  
Reactor Pressure ◽  
Plant Shutdown

Probabilistic Safety Assessment (PSA) for the plant shutdown state of nuclear power plants is performed based on Plant Operational States (POSs) which depend on periodic inspections and maintenance. For a typical BWR, the shutdown POSs are defined in consideration of various plant conditions: boundaries of Primary Containment Vessel (PCV)/ Reactor Pressure Vessel (RPV), reactor water level, availability of mitigation systems and temperature/pressure of primary coolant. The shutdown POSs for a BWR plant may involve conservative simplifications. One of the simplifications is treatment of PCV/RPV heads conditions during the POSs involving their opening/closing operations. Usually the PCV/RPV heads conditions are assumed to be the most onerous in terms of accident sequence modelling on both Level 1 and 2 PSA. In this study, a sensitivity analysis is performed to understand the significance of the conservatism by refining the POSs which involve opening/closing operations of PCV/RPV heads.

Effect of Influential Factors on the Reliability of the Mechanical Behavior of a Composite Plate Holes Fatigue Loaded

2013 ◽  
Vol 682 ◽  
pp. 161-167
Author(s):  
C. Bouraoui ◽  
Med. Bouassaadia ◽  
R. Ben Sghaier ◽  
Moussa Karama
Keyword(s):  
Sensitivity Analysis ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Cyclic Loading ◽  
Composite Plate ◽  
Influential Factors ◽  
Geometrical Parameters ◽  
Composite Component ◽  
Fiber Volume ◽  
The Monte Carlo Method

This work presents a sensitivity analysis of mechanical and geometrical parameters on a composite component under a cyclic loading. A design of experiments approach has been used. This study in improved by a reliability approach where the scatterings of all the characteristic properties are taken into account. The Monte Carlo method where used to compute the reliability. An application has been carried out on a composite rectangular plate with a hole in its center. Where a useful surface responses diagrams of the reliability are determined. A significant nonlinear effect of the fiber volume faction is observed on the behaviors reliability with no significant interactions effect with the others factors.

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