Strength criteria at the tip of the crack

Jinescu, Valeriu V.; Nicolof, Vali-Ifigenia

doi:10.1016/j.engfracmech.2015.04.022

Cited by 7 publications

(7 citation statements)

References 19 publications

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“…On the other hand, by expanding the results obtained in work [27], one may write that the damage caused by the crack with depth a and length 2c is, (58) Because fracture mode I corresponds to the loading within the limits of linear-elastic behavior, K=k 1 =1, while α=α 1 =1, the previous relationship becomes, (59) With relationships (48) and (52) -(54) and (58), one can verify the strength of the flange joints of a cyclically stressed pressure vessel undergoing different stress groups in the Wöhler diagram zones I, II and III.…”

Section: Calculation Of Flange Joints Under Fatigue Loadmentioning

confidence: 94%

“…, is: . (27) If f b T T ≠ an additional force emerges, namely ( ) T F G ∆ , the additional force on the gasket due to the difference between bolt and flange expansion [8] is, (28) where: (29) where the sealing force required by the gasket when [8], (30) It means that the effect of the differing tendencies in thermal expansion has a bearing upon the sealing force. This must be checked in accordance with the operating conditions (T≠T o and p≠p o ).…”

Section: Conclusion Regarding the Calculation Of Flange Joints Basedmentioning

confidence: 99%

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Evaluation and Completion the Design Methods of Pressure Vessels Flange Joints

Jinescu¹,

URSE²,

Chelu³

2018

Rev. Chim.

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We have provided a comparative analysis of the current international computing standards (European Standard EN 13445-3; ASME-Code, Section VIII, Division 2; British Standard (PD 5500: 2009)) that take into consideration only the static loading of flanges and bolts, if the temperatures of the flanges, bolts and sealing gasket are equal to each other and lower than creep temperature. The paper has put forth relations for completion the calculation method for flange joints in situations not taken into consideration by standards, namely: -static loading if flange temperature and bolt temperature are different; -thermal transient loading; -creep stress; -fatigue loading in the general case of a sequence of blocks of normal stresses. Furthermore, relationships have been proposed for the calculation of the maximum allowable difference between a flange and a bolt so as to ensure both the tightness and the mechanical strength of the flange joint.

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Section: Calculation Of Flange Joints Under Fatigue Loadmentioning

confidence: 94%

Section: Conclusion Regarding the Calculation Of Flange Joints Basedmentioning

confidence: 99%

Evaluation and Completion the Design Methods of Pressure Vessels Flange Joints

Jinescu¹,

URSE²,

Chelu³

2018

Rev. Chim.

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“…Such problems have been resolved in other cases, corresponding either to loads cumulation [14,15], or some load superposition [16][17][18][19][20][21], upon a certain body (solid body, environmental, living organism...) a. Solving of superposition and/or cumulations problems of some loads effects, In the general case of non-linear behaviour of matter, is done using the principle of critical energy [22][23][24].…”

Section: Evaluation the Critical State Of The Environment And Living mentioning

confidence: 99%

“…By manufacturing, in the engineering components there are induced residual stresses, σ res , to which corresponds the participation, (21) where σ u is the ultimate stress and δ res =1 if the residual stresses act in the direction of the process taking place and δ res =-1 if not.…”

Section: Generally Withmentioning

confidence: 99%

Superposition of Potential Chemical Polluants and Radioisotopes and Their Influence Upon the Environment and Living Organisms

Jinescu¹,

Manea²,

Jinescu³

et al. 2017

Rev. Chim.

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Following the activities developed in a nuclear facility result gaseous and liquid radioactive effluents and radioactive solid waste. All these waste contain radioactive isotopes which are potentially pollutants for the environment. In the same time chemicals are, also, pollutants. According to the legislation, discharging of chemicals and radioactive liquid and gaseous effluents into the environment, should meet the requirements of the unrestricted discharge. However, what happens when several pollutants superpose: only chemical pollutants, or only radioactive pollutants, or chemical and radioactive pollutants? Such problems have been solved in this paper on the basis of the principle of critical energy.

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“…The principle of critical energy has allowed so far the finding of solutions to many problems of superposition and/or cumulation of actions or their effects on engineering structures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], or on living organisms that find themselves under stress, abused and/or medically treated [2,13].…”

Section: Introductionmentioning

confidence: 99%

The Principle of Critical Energy as a Transdisciplinary Principle with Interdisciplinary Applications

Jinescu¹,

Nicolof²,

Jinescu³

et al. 2016

Proceedings of the International Conference on Interdisciplinary Studies (ICIS 2016) - Interdisciplinarity and Creativity in Th

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The priσciple τf critical eσergy PCE is a traσsdiscipliσary priσciple that may be used iσ all chapters τf scieσces fτr superpτsitiτσ aσd/τr cumulatiτσ τf differeσt exterσal actiτσs mechaσical, thermal, magσetic, electrical, chemical, etc. It may be used fτr lifetime evaluatiτσ τf eσgiσeeriσg structures, as well as fτr liviσg τrgaσisms, by takiσg iσtτ accτuσt the iσflueσces due tτ pτllutiτσ, due tτ iσterσal deteriτratiτσ, due tτ prelτadiσg τr residual stresses, etc. Iσ this paper, we explaiσ what PCE is, hτw it may be practically used aσd the iσterdepeσdeσces betweeσ the terms cτmprised iσ its geσeral relatiτσ. PCE was applied fτr sτlviσg prτblems τf superpτsitiτσ τf exterσal actiτσs aσd iσterσal deteriτratiτσs iσ the fτllτwiσg chapters τf scieσces mechaσical eσgiσeeriσg, thermτmechaσical-chemical lτadiσgs, multiple pτllutiτσ, medical field aσd viscτelasticity. It was cτmpared with syσergy theτry aσd with catastrτphe theτry.Keywords: Traσsdiscipliσarity, iσterdiscipliσarity, priσciple τf critical eσergy, superpτsi-tiτσ aσd cumulatiτσ τf lτad actiτσs, multiple pτllutiτσ, applicatiτσ iσ medical field, viscτus aσd elastic behaviτur, syσergy

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Strength criteria at the tip of the crack

Cited by 7 publications

References 19 publications

Evaluation and Completion the Design Methods of Pressure Vessels Flange Joints

Evaluation and Completion the Design Methods of Pressure Vessels Flange Joints

Superposition of Potential Chemical Polluants and Radioisotopes and Their Influence Upon the Environment and Living Organisms

The Principle of Critical Energy as a Transdisciplinary Principle with Interdisciplinary Applications

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