Limit loads for knuckle-encroaching nozzles in torispherical heads: Experimental verification of finite element predictions

Hsieh, Min‐Fu; Moreton, D. N.; Mistry, J.; Moffat, D. G.

doi:10.1243/030932402760074535

Cited by 7 publications

(1 citation statement)

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“…b. The strength calculation with Fracture mechanics concepts is based on the condition, (8) where K eq is the equivalent stress intensity factor and K al is the allowable value of the stress intensity factor. c. Another way to solve the strength problem on the basis of Fracture mechanics concepts but using the Principle of critical energy consists in the following condition [23,24], (9) where i =I, II, III refer to the three fracture modes: Iopening mode; II -sliding mode; III -tearing mode.…”

Section: Critical Stresses and Critical Loadsmentioning

confidence: 99%

The Influence of Loads Superposition, Deterioration Due to Cracks and Residual Stresses on the Strength of Tubular Junction

Jinescu¹,

Chelu²,

Zecheru³

et al. 2017

Rev. Chim.

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In the paper the interaction of several loads like pressure, axial force, bending moment and torsional moment are analyzed, taking into account the deterioration due to cracks and the influence of residual stresses. A nonlinear, power law, of structure material is considered. General relationships for total participation of specific energies introduced in the structure by the loads, as well as for the critical participation have been proposed. On these bases: - a new strength calculation methods was developed; � strength of tubular cracked structures and of cracked tubular junction subjected to combined loading and strength were analyzed. Relationships for critical state have been proposed, based on dimensionless variables. These theoretical results fit with experimental date reported in literature. On the other side stress concentration coefficients were defined. Our one experiments onto a model of a pipe with two opposite nozzles have been achieved. Near one of the nozzles is a crack on the run pipe. Trough the experiments the state of stress have been obtained near the tubular junction, near the tip of the crack and far from the stress concentration points. On this basis the stress concentration coefficients were calculated.

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Section: Critical Stresses and Critical Loadsmentioning

confidence: 99%