More accurate stress intensity factor derived by finite element analysis for the ISRM suggested rock fracture toughness specimen—CCNBD

Abstract This paper presents the application of the rules from ASME Section VIII, Division 3 of the ASME Boiler and Pressure Vessel Code for a fracture mechanics evaluation to determine the damage tolerance and fatigue life of a flowline clamp connector. The guidelines from API 579-1 / ASME FFS-1 Fitness-For-Service for the stress analysis of a crack-like flaw have been considered for this assessment. The crack tip is modeled using a refined mesh around the crack tip that is referred to as a focused mesh approach in API 579-1 / ASME FFS-1. The driving force method is used as an alternative to the failure assessment diagram method to account for the influence of crack tip plasticity. The J integral is determined using elastic-plastic finite element analysis and converted to an equivalent stress intensity factor to be compared to the fracture toughness of the material. The fatigue life is calculated using the Paris Law equation and the stress intensity factor calculated from the finite element analysis. The allowable number of design cycles is determined using the safety factors required from Division 3 of the ASME Pressure Vessel Code.

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Fracture Mechanics Fatigue Evaluation of a Flowline Clamp Connector Using Finite Element Modeling of a Crack

Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Rudy Scavuzzo Student Paper Symposium and 26th Annual Student Paper Competition ◽

10.1115/pvp2018-85164 ◽

2018 ◽

Author(s):

Curtis Sifford ◽

Ali Shirani

Keyword(s):

Finite Element Analysis ◽

Stress Intensity Factor ◽

Finite Element ◽

Fatigue Life ◽

Stress Intensity ◽

Fracture Mechanics ◽

Intensity Factor ◽

Pressure Vessel ◽

Crack Tip ◽

Element Analysis

This paper presents the application of the rules from ASME Section VIII, Division 3 of the ASME Boiler and Pressure Vessel Code for a fracture mechanics evaluation to determine the damage tolerance and fatigue life of a flowline clamp connector. The guidelines from API 579-1 / ASME FFS-1 Fitness-For-Service for the stress analysis of a crack-like flaw have been considered for this assessment. The crack tip is modeled using a refined mesh around the crack tip that is referred to as a focused mesh approach in API 579-1 / ASME FFS-1. The driving force method is used as an alternative to the failure assessment diagram method to account for the influence of crack tip plasticity. The J integral is determined using elastic-plastic finite element analysis and converted to an equivalent stress intensity factor to be compared to the fracture toughness of the material. The fatigue life is calculated using the Paris Law equation and the stress intensity factor calculated from the finite element analysis. The allowable number of design cycles is determined using the safety factors required from Division 3 of the ASME Pressure Vessel Code.

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Stress Intensity Factor using Finite Element Analysis in Rectangular Orthotropic Composite Annular Disk

Defence Science Journal ◽

10.14429/dsj.47.3977 ◽

1997 ◽

Vol 47 (1) ◽

pp. 55-63

Author(s):

P. Ravinder Reddy ◽

G. Ramamurthy

Keyword(s):

Finite Element Analysis ◽

Stress Intensity Factor ◽

Finite Element ◽

Stress Intensity ◽

Intensity Factor ◽

Element Analysis ◽

Annular Disk ◽

Orthotropic Composite

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Influence of crack closure on the stress intensity factor for plates subjected to bending—A 3-D finite element analysis

Engineering Fracture Mechanics ◽

10.1016/0013-7944(83)90083-8 ◽

1983 ◽

Vol 17 (4) ◽

pp. 323-333 ◽

Cited By ~ 29

Author(s):

R.S. Alwar ◽

K.N.Ramachandran Nambissan

Keyword(s):

Finite Element Analysis ◽

Stress Intensity Factor ◽

Finite Element ◽

Stress Intensity ◽

Intensity Factor ◽

Crack Closure ◽

Element Analysis

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Finite element analysis of boron nitride nanotubes' shielding effect on the stress intensity factor of semielliptical surface crack in a wide range of matrixes using RVE model

Composites Part B Engineering ◽

10.1016/j.compositesb.2016.11.017 ◽

2017 ◽

Vol 110 ◽

pp. 351-360 ◽

Cited By ~ 12

Author(s):

Davar Ali ◽

Sadri Sen

Keyword(s):

Finite Element Analysis ◽

Stress Intensity Factor ◽

Finite Element ◽

Stress Intensity ◽

Boron Nitride ◽

Intensity Factor ◽

Boron Nitride Nanotubes ◽

Shielding Effect ◽

Element Analysis ◽

Wide Range

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Finite Element Analysis on the Stress Intensity Factor under Combined Bending and Torsion Loading

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.462-463.1325 ◽

2011 ◽

Vol 462-463 ◽

pp. 1325-1330

Author(s):

Al Emran Ismail ◽

Ahmad Kamal Ariffin ◽

Shahrum Abdullah ◽

Mariyam Jameelah Ghazali ◽

M. Abdulrazzaq

Keyword(s):

Finite Element Analysis ◽

Stress Intensity Factor ◽

Finite Element ◽

Stress Intensity ◽

Intensity Factor ◽

Crack Depth ◽

Crack Tip ◽

Fe Model ◽

Element Analysis ◽

Loading Ratio

The stress intensity factor (SIF) under the combined bending and torsion loading were studied using a finite element (FE) analysis ANSYS. A 20-node iso-parametric element was used to model the crack tip and the square-root singularity of stress/strain was employed by shifting the mid-side node to the ¼ position to the crack tip. Different crack geometries and loading ratios were used and due to the non-symmetrical analysis involved, a full FE model was developed and analyzed. Remotely applied bending and torsion moment were subjected to the FE model and the SIF were then calculated along the crack front under such loadings. The SIF calculated using the finite element analysis (FEA) was compared with those results obtained using an effective combined SIF method. According to the comparisons, the discrepancies were dependent on the normalized coordinate, x/h, the relative crack depth, a/D, the crack aspect ratio, a/b and the loading ratio, .

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