A work criterion for plastic collapse

Muscat, Martin; Mackenzie, Donald; Hamilton, Robert

doi:10.1016/s0308-0161(02)00105-9

Cited by 52 publications

(38 citation statements)

References 2 publications

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“…For the case of cylinder subjected to a single load, e.g. pure bending or pure torsion, the collapse moment is defined using the twice-elastic-slope (TES) method [11]. For the case of cylinder subjected to combined bending and torsion moments, the plastic collapse load is defined from the value of the maximum bending moment which the model can carry.…”

Section: Limit Load Analysismentioning

confidence: 99%

Collapse load analysis for circumferentially cracked cylinder subjected to combined torsion and bending moments

Arun

Fongsamootr

2018

MATEC Web Conf.

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Abstract. Cylinder is one of the most commonly used components which has a risk of having circumferential cracks, especially in the welding zone. When cracks are discovered, it is necessary to perform the failure strength assessment of cracked cylinder and the limit load play an important part as the input of the assessment. At present, the limit load solution for circumferential cracked cylinder under combined bending and torsion can be estimated by using the methods of equivalent moment or biaxial failure parameter. However, these methods still have some limitations. The main aim of this paper is to propose the alternative method for predicting the failure moment of circumferential cracked cylinder under combined bending and torsion. The method used in this paper is based on the modification of biaxial failure parameter and the data from finite element analysis. Details of this method is presented in this paper.

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Section: Limit Load Analysismentioning

confidence: 99%

Collapse load analysis for circumferentially cracked cylinder subjected to combined torsion and bending moments

Arun

Fongsamootr

2018

MATEC Web Conf.

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“…Gerdeen proposed that plastic dissipation could provide an improved failure criterion of plastic collapse in reference [8], in which he presented a collapse criterion based on the relationship between plastic dissipation and elastic strain energy in the vessel in a general form. More recently, Muscat et al proposed a plastic collapse criterion based on a characteristic plot of a global load parameter, λ , representing all applied loads, against plastic work dissipation in the vessel, as illustrated in Figure 1b [9]. The criterion applies a geometric construction to define the GPD load.…”

Section: Plastic Work Curvature Criterionmentioning

confidence: 99%

Design by analysis of ductile failure and buckling in torispherical pressure vessel heads

Mackenzie

Camilleri

Hamilton

2008

Thin-Walled Structures

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This version is available at https://strathprints.strath.ac.uk/7495/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Abstract:Thin shell torispherical pressure vessel heads are known to exhibit complex elasticplastic deformation and buckling behaviour under static pressure. In pressure vessel Design by Analysis, the designer is required to assess both of these behaviour modes when specifying the allowable static load. The EN and ASME Boiler and Pressure Vessel Codes permit the use of inelastic analysis in design by analysis, known as the direct route in the EN Code. In this paper, plastic collapse or gross plastic deformation loads are evaluated for two sample torispherical heads by 2D and 3D FEA based on an elastic-perfectly plastic material model. Small and large deformation effects are considered in the 2D analyses and the effect of geometry and load perturbation are considered in the 3D analysis. The plastic load is determined by applying the ASME Twice Elastic Slope Criterion of plastic collapse and an alternative plastic criterion, the Plastic Work Curvature criterion. The formation of the gross plastic deformation mechanism in the models is considered in relation to the elastic-plastic buckling response of the vessels. It is concluded that in both cases, design is limited by formation of an axisymmetric gross plastic deformation in the knuckle of the vessels prior to formation of non-axisymmetric buckling modes.

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“…The plastic work curvature criterion was applied to a equal thickness branch intersection configuration previously investigated by Moffat et al [4] and Muscat et al [6]. The vessel geometry is shown in Fig.…”

Section: Branch Intersection Examplementioning

confidence: 99%

“…He proposed that the plastic load is reached when the plastic work is some factor α of the elastic strain energy stored, however he did not define a general value for α but referred to earlier criteria for suitable values for particular applications. Muscat et al [6] adopted a different approach and proposed a plastic collapse criterion based on a characteristic plot of a load parameter, λ, representing all applied loads, against plastic work dissipation in the vessel. The total plastic work dissipated in the vessel is a measure of the global response and is suitable for characterizing gross plastic deformation.…”

Section: Introductionmentioning

confidence: 99%