Numerical and Experimental Analysis of Stress and Strains in Flat Ends of High-Pressure Vessels

Szybiński, Bogdan; Romanowicz, Paweł; Zieliński, Andrzej

doi:10.4028/www.scientific.net/kem.490.226

Cited by 11 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For solving the IBVP an explicit 2nd-order time integration scheme was used. Szybiński et al [310] showed numerically the influence of parameters defining a circular stress relief groove, position of the groove and its radius on stresses and strains in flat ends of high-pressure vessels. The results were verified in experimental investigations.…”

Section: Junctions Of Shells Of Revolutionmentioning

confidence: 99%

Junctions in shell structures: A review

Pietraszkiewicz

Konopińska

2015

Thin-Walled Structures

View full text Add to dashboard Cite

Section: Junctions Of Shells Of Revolutionmentioning

confidence: 99%

Junctions in shell structures: A review

Pietraszkiewicz

Konopińska

2015

Thin-Walled Structures

View full text Add to dashboard Cite

“…Such geometries (optimal and nonoptimal with respect to the minimum value of the equivalent plastic strain) were selected after numerical optimization (finite element method). The obtained numerical and experimental results were compared and discussed in detail in the [12]. The performed numerical studies, verified by the experiments, revealed the presence of plastic zones which appeared in the cut-out regions.…”

Section: Introductionmentioning

confidence: 83%

“…The maximal value of the equivalent plastic strains for the nonoptimal configuration was several times higher than the respective one for the optimal groove configuration. Detailed results are given in [12]. The presence of such zones of plastic strains in the vicinities of the weld zones, in which material is also subjected to structural changes, may lead to a local increase in hardness and decrease in the fracture parameters in the weld and heat-affected zones [15].…”

Section: Introductionmentioning

confidence: 99%

“…This results in a variation of admissible groove parameters calculated according to the respective code applied in boiler calculations. In previous studies [9,[12][13][14], it was observed that the geometries of relieve grooves, acceptable from the point of view of the Standard EN 12952:3, may significantly differ in strength, durability, or other engineering parameters. Experimental tests were performed for the cylindrical pressure vessel with flat ends made from 16Mo3 steel with an external diameter 406.4 mm [12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Flat Ends in Pressure Vessels

Szybiński

Romanowicz

2019

Materials

Self Cite

View full text Add to dashboard Cite

The application of flat ends in pressure boilers is inevitably associated with the presence of stress concentration, which is observed in the vicinity of the junction of the cylinder and the closing flat plate. The analyzed flat end plates with stress relief grooves fall into the group of solutions recognized by the respective Standards of Calculations of Pressure Vessels. Unfortunately, no clear evidence is given in the Standards on how to choose the best groove parameters. This opens up the problem of the optimal choice of the groove parameters providing a minimum stress level. Even for the optimal values defining the stress relief groove geometry, certain plastic deformations are observed in the groove area for materials which exhibit elastic-plastic properties. Such a situation is completely unacceptable during exploitation, and a suitable reduction of the operating pressure is necessary. This paper discusses the effectiveness of other designs for flat ends used in pressure vessels. The proposed modifications took the form of external ribs applied around the top of the endplate circumference. The dimensions of these ribs were set using parametric optimization. The results of the study encouraged the authors to perform a more general analysis with the use of topology optimization. The results of all performed studies proved that the reduction of stress concentration and the full elimination of plastic deformation are possible. All numerical calculations were made using the finite element code (FEM), Ansys.

show abstract

“…The FEM method is the one of the most common method in different kind of the engineering problems [54,62,66]. There are many publications devoted to FEM and its practical use, for example [79,42].…”

Section: Finite Element Methodsmentioning

confidence: 99%

Structural Health Monitoring (SHM) Methods in Machine Design and Operation

Barski¹,

Kędziora²,

Muc³

et al. 2014

Archive of Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

The present paper is devoted to the discussion and review of the non-destructive testing methods mainly based on vibration and wave propagation. In the first part, the experimental methods of actuating and analyzing the signal (vibration) are discussed.The piezoelectric elements, fiber optic sensors and Laser Scanning Doppler Vibrometer (SLDV) method are described. Effective detecting of the flaws needs very accurate theoretical models. Thus, the numerical methods, e.g. finite element, spectral element method and numerical models of the flaws in isotropic and composite materials are presented. Moreover, the detection of the damage in structures, which are subjected to cyclic or static loads, is based on the analyzing of the change in natural frequency of the whole structure, the change of internal impedance of the material and the change in guided waves propagating through the investigated structure. All these cases are characterized in detail. At the end of this paper, several applications of the structural health monitoring systems in machine design and operation are presented.

show abstract

Numerical and Experimental Analysis of Stress and Strains in Flat Ends of High-Pressure Vessels

Cited by 11 publications

References 8 publications

Junctions in shell structures: A review

Junctions in shell structures: A review

Optimization of Flat Ends in Pressure Vessels

Structural Health Monitoring (SHM) Methods in Machine Design and Operation

Contact Info

Product

Resources

About