The Critical Volume Method in Fatigue Analysis

Taylor, David; Wang, G.

doi:10.1007/978-94-010-0880-8_12

Cited by 2 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…critical distance approach (CDA) [66,67], critical plane approach (CPA) [68], critical volume approach (CVA) [69], and so on. (2) The second is to evaluate the fatigue life of the notched component by the strain-based variables, such as the equivalent strain range, maximum principle strain, maximum shear strain, and so on.…”

Section: Strain-controlled Modementioning

confidence: 99%

Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism

Gong

Cheng

Xuan

et al. 2019

Journal of Pressure Vessel Technology

View full text Add to dashboard Cite

Structural discontinuities (e.g., nozzle, hole, and groove) widely occur in many high temperature components of nuclear and fossil power plants. In general, the notched component is used for simplified tests and analyses due to the complexity of the introduction of a practical component. In the previous work, the effects of the notch on failure life of the components have been reported experimentally, including the strengthening and weakening effects; however, the internal mechanisms have not been clearly demonstrated. This work reviews the notch effects on the structural strength of the notched components at elevated temperatures under creep, fatigue, and creep-fatigue loading conditions. Experimental phenomena (i.e., strengthening or weakening effects) for typical notched specimens subjected to the above three loading conditions are summarized, and the related factors for notch effects on creep rupture life or cycle to failure of the components are discussed. The mechanisms for the strengthening or weakening effects induced by a notch are described. Evaluation procedures for notch effect analysis under complex loading conditions are also included, and the primary challenges concerning the notch effect are provided for further investigations.

show abstract

Section: Strain-controlled Modementioning

confidence: 99%

Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism

Gong

Cheng

Xuan

et al. 2019

Journal of Pressure Vessel Technology

View full text Add to dashboard Cite

show abstract

“…Essentially it doesn’t matter which method is used in this region, although the most mechanistically reasonable solution would be to average the stress over d (or perhaps over a slightly larger distance such as a o /2 to represent the largest grain). An alternative strategy for blunt notches, which we have suggested in a previous publication 18 is to vary the critical distance as a function of D / ρ , so that it decreases from 2 a o to d as crack shape changes from a sharp notch to a plain specimen. However for most notch geometries the difference that this modification creates is negligible and it complicates the analysis as it requires knowledge of the value of ρ , which may not be obvious for a component feature.…”

Section: Blunt Notchesmentioning

confidence: 99%

A mechanistic approach to critical‐distance methods in notch fatigue

Taylor

2001

Fatigue Fract Eng Mat Struct

Self Cite

114

View full text Add to dashboard Cite

One approach to the prediction of notch fatigue limits is the Neuber method in which stresses are averaged over a critical distance ahead of the notch. In recent years this theory has been updated by the discovery of an analytical method for finding the critical distance for a given material, which shows that the appropriate distance is 2ao , ao being El Haddad’s short‐crack constant. The present author has advocated this approach, which he has called the Line Method (LM) and has tested it extensively against experimental data. However the method still remains essentially empirical; the aim of the present paper was to try to link this approach to the known mechanisms of crack growth at a notch. It is proposed that the LM is successful because it expresses the conditions necessary for growth of a small crack located at the notch root. The argument is developed by starting from the resistance curves used to predict non‐propagating cracks and by linking the LM with the expression for stress intensity, K, derived by the crack‐line loading method. The results provide some mechanistic justification for the use of the LM for sharp, crack‐like notches; its success for other types of notch (i.e. blunt notches and short notches) requires a different explanation.

show abstract

The Critical Volume Method in Fatigue Analysis

Cited by 2 publications

References 14 publications

Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism

Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism

A mechanistic approach to critical‐distance methods in notch fatigue

Contact Info

Product

Resources

About