An efficient stress intensity factor solution scheme for corner cracks at holes under bivariant stressing

Lee, Y. D.; McClung, R. Craig; Chell, G. G.

doi:10.1111/j.1460-2695.2008.01292.x

Cited by 17 publications

(17 citation statements)

References 29 publications

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“…The main simplifying assumptions are that crack growth occurs within a plane and that the aspect ratio of the crack remains constant during the growth process. 26 The bivariant stresses 27 and thermal load relaxation when the crack opens 28,29 are not considered. The statistical variables l w and Y represent the variation in SIF between the most realistic crack growths based on a 3D cracked FEM and the simple proposed analytical model.…”

Section: Inputs: Target Reliability and Welding Parametersmentioning

confidence: 99%

Inspection scheduling based on reliability updating of gas turbine welded structures

Coro

Abasolo

Aguirrebeitia

et al. 2019

Advances in Mechanical Engineering

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This article presents a novel methodology for the inspection scheduling of gas turbine welded structures, based on reliability calculations and overhaul findings. The model was based on a probabilistic crack propagation analysis for welds in a plate and considered the uncertainty in material properties, defect inspection capabilities, weld geometry, and loads. It developed a specific stress intensity factor and an improved first-order reliability method. The proposed routine alleviated the computational cost of stochastic crack propagation analysis, with accuracy. It is useful to achieve an effective design for manufacturing, to develop structural health monitoring applications, and to adapt inspection schedules to airplane fleet experience.

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Section: Inputs: Target Reliability and Welding Parametersmentioning

confidence: 99%

Inspection scheduling based on reliability updating of gas turbine welded structures

Coro

Abasolo

Aguirrebeitia

et al. 2019

Advances in Mechanical Engineering

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“…McClung et al derived new weight function SIFs to address stress gradients that vary in all directions on the fracture plane . Lee et al developed an efficient 3D SIF‐solution scheme for corner cracks at holes under bivariant stressing . The obtained SIFs were in very good agreement with independent results computed using a general boundary element FADD3D fracture mechanics software, for the plate with an offset hole.…”

Section: Wfms For 3d Crack Problemsmentioning

confidence: 84%

A review and verification of analytical weight function methods in fracture mechanics

2019

Fatigue Fract Eng Mat Struct

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The weight function method is a powerful method for the determination of key parameters of stress intensity factors and crack opening displacements that are fundamental for crack analyses in fracture mechanics. The method has a remarkable computational efficiency without compromising solution accuracy and is especially suited for cracks in real‐world components with complex stress gradients. A critical issue for successful development and reliable application of the weight function method is how to achieve verifiable and high solution accuracy. This paper provides several reflections on the current state of the art in weight function methods, including a brief historical perspective and description of several analytical and numerical weight methods, with main focus on the two‐dimensional (2D) analytical approaches. A variety of typical application examples are presented. A platform for point‐by‐point accuracy assessment by using the Green's functions is established on a completely independent numerical approach with validated accuracy. Rigorous and systematic verification of the accuracy levels of different 2D analytical weight function approaches are conducted using several benchmark crack geometries. The sources of inaccuracy of different analytical weight function methods are analysed. A brief account on weight function methods for analysing three‐dimensional (3D) crack problems with arbitrary univariant and bivariant stress distributions is provided.

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“…Direct access to all of the detailed stress fields is of little value to the life analysis process, however, unless this information can be used to calculate the SIF more accurately. This new automated process is supported by a new family of WF SIF solutions with improved accuracy and efficiency [6][7][8]. New solutions were derived for comer, surface, or embedded cracks in rectangular plates and corner or surface cracks at circular holes in rectangular plates.…”

Section: Interfaces With Finite Element Models and Stress Intensitymentioning

confidence: 99%

New Methods for Automated Fatigue Crack Growth and Reliability Analysis

McClung

Lee

Enright

et al. 2014

Journal of Engineering for Gas Turbines and Power

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A new methodology has been developed for automated fatigue crack growth (FCG) life and reliability analysis of components based on finite element (FE) stress and temperature models, weight function stress intensity factor (SIF) solutions, and algorithms to define idealized fracture geometry models. The idealized fracture geometry models are rectangular cross sections with dimensions and orientation that satisfactorily approximate an irregularly-shaped component cross section. The fracture model geometry algorithms are robust enough to accommodate crack origins on the surface or in the interior of the component, along with finite component dimensions, cuiyed surfaces, arbitrary stress gradients, and crack geometry transitions as the crack grows. Stress gradients are automatically extracted from multiple load steps in the FE models for input to the fracture models. The SIF solutions accept univariant stress gradients and have been optimized for both computational efficiency and accuracy. The resulting calculations are used to automatically construct FCG life contours for the component and to identify hot spots. Finally, the new algorithms are used to support automated probabilistic assessments that calculate component reliability considering the variability in the size, location, and occurrence rate of the initial anomaly; the applied stress magnitudes; material properties; probability of detection; and inspection time. The methods are particularly useful for determining the probability of component fracture due to fatigue cracks forming at material anomalies that can occur anywhere in the volume of the component. The automation significantly improves the efficiency of the analysis process while reducing the dependency of the results on the individual judgments of the analyst. The automation also facilitates linking of the life and reliability management process with a larger integrated computational materials engineering (ICME) context, which offers the potential for improved design optimization.

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An efficient stress intensity factor solution scheme for corner cracks at holes under bivariant stressing

Cited by 17 publications

References 29 publications

Inspection scheduling based on reliability updating of gas turbine welded structures

Inspection scheduling based on reliability updating of gas turbine welded structures

A review and verification of analytical weight function methods in fracture mechanics

New Methods for Automated Fatigue Crack Growth and Reliability Analysis

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