A Study on Fatigue Crack Closure Associated with the Growth of Long Crack in a New Titanium Alloy

Liu, Jiarui; Chen, Jiawei; Sun, Zhengyi; Zhang, Haicheng; Yuan, Qingsong

doi:10.3390/met13081377

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…The z-axis is in the direction of the specimen's extrusion. In the critical zone of the crack front, the minimum element size was defined based on the size of the plastic zone, for which the Dugdale expression [22], Equation (1), was used:…”

Section: Methodsmentioning

confidence: 99%

“…In areas close to the crack, the size of the area where the plastic strain occurs requires a large number of elements for its finite element analysis, which directly influences the results of stress and strain on the crack front [4,5,7]. However, the discretization at the crack has been determined through established theoretical criteria, such as the Dugdale plastic zone radius [22]. The use of specific meshing strategies for these problems has been extended, with a first volume in the crack environment, fine and controlled meshing, and another automatic one where the result gradients do not present convergence problems for the accuracy of the results [5].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Plastic Zone at the Crack Front in Cylindrical Aluminum Specimens Subjected to Tensile Loads

Abatta-Jacome,

Lima-Rodriguez,

Gonzalez-Herrera

et al. 2023

Materials

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Cylindrical specimens are of great interest in analyzing mechanical elements’ behavior and investigating phenomena with biaxial loads. It is necessary to identify the behavior of the crack front along the thickness to interpret these results, which are usually based on the hypothesis of a straight crack and the observation of the outer face of the crack front. Based on the work carried out on compact tension type specimens, this work proposes adapting this methodology to cylindrical specimens, adapting the previous finite element models. Cylindrical specimens provide an asymmetric behavior influenced by the radius, where the CT (compact tensile) specimen can be considered the extreme infinite radius case. Combinations of the load level and radius values help us simulate the crack’s behavior under intermediate hypotheses between a plane crack theory and a three-dimensional one. The plastic strain around the crack front will be analyzed as a function of the thickness and the load level applied. The results allow us to validate the numerical methodology and establish the differentiated behaviors of the plastic zones close to the outer and inner radii.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Plastic Zone at the Crack Front in Cylindrical Aluminum Specimens Subjected to Tensile Loads

Abatta-Jacome,

Lima-Rodriguez,

Gonzalez-Herrera

et al. 2023

Materials

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show abstract

“…As outlined in [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] variants of this approach are now widely used to model the growth of long cracks in conventionally manufactured metals. However, it should also be noted that it has recently been suggested [65] that R ratio effects on the growth of long cracks can be interpreted as a reflection of the effect of the environment on the crack tip region rather than crack closure per se.…”

Section: Introductionmentioning

confidence: 99%

On the Link between Plastic Wake Induced Crack Closure and the Fatigue Threshold

Jones,

Ang,

Phan

et al. 2024

Metals

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This purpose of this paper is to examine the relationship between crack growth equations based on Elber’s original plastic wake induced crack closure concept and the fatigue threshold as defined by the American Society for Testing and Materials (ASTM) fatigue test standard ASTM E647-15el. It is shown that, for a number of conventionally manufactured metals, the function U(R), where R is the ratio of the minimum to maximum applied remote stress, that is used to relate the stress intensity factor ΔK to the effective stress intensity factor ΔKeff is inversely proportional to the fatigue threshold ΔKth(R). This finding also results in a simple closed form equation that relates the crack opening stress intensity factor Ko(R) to ΔK, Kmax, and the fatigue threshold terms ΔKth(R) and ΔKeff,th. It is also shown that plotting da/dN as function of ΔK/ΔKth(R) would appear to have the potential to help to identify the key fracture mechanics parameters that characterise the effect of test temperature on crack growth. As such, for conventionally manufactured metals, plotting da/dN as function of ΔK/ΔKth(R) would appear to be a useful addition to the tools available to assess the fracture mechanics parameters affecting crack growth.

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“…Guo et al [6] studied TC4 using TIG welding and examined the impact of defect characteristics on fatigue life prediction. Liu et al [7] explored the crack closure characteristics of a novel titanium alloy. Wang et al [8] conducted research on the fatigue crack growth behavior of TC2 using TIG welding.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Fatigue Crack Growth in Vacuum-Brazed Titanium Alloy

Huang,

Hwang,

Huang

2023

Metals

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The assessment of fatigue is a crucial concern in welded components and structures. This study investigates the fatigue properties and models for predicting fatigue crack growth in Ti-6Al-4V titanium alloy when processed by vacuum brazing with TiCuNi filler. Fatigue properties and the impact of the stress ratio were determined through constant amplitude fatigue tests. By utilizing the results obtained from variable amplitude fatigue tests, various prediction models for fatigue crack growth were examined: modifications for load interaction, residual stress, and crack closure. The results indicate that the microstructures in the brazed zone consist of numerous fine, elongated needle-like Widmanstätten structures. In terms of cycle counting methods, the rainflow method outperforms the simple-range method. In the stable crack growth rate region, fatigue crack growth rate increases with the rise in stress ratio in a manner similar to high-strength steels. The Paris model without any modification obtains good predictions. For models modified with crack closure, the Elber model yields slightly better prediction results than the Schijve model. Among fatigue crack growth prediction models, the Willenborg model with residual stress modification produces the best results. Fracture surfaces within fatigued specimens’ brazed zones exhibit ductile failure characteristics, where fatigue striations and secondary cracks were observed.

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A Study on Fatigue Crack Closure Associated with the Growth of Long Crack in a New Titanium Alloy

Cited by 3 publications

References 15 publications

Numerical Study of the Plastic Zone at the Crack Front in Cylindrical Aluminum Specimens Subjected to Tensile Loads

Numerical Study of the Plastic Zone at the Crack Front in Cylindrical Aluminum Specimens Subjected to Tensile Loads

On the Link between Plastic Wake Induced Crack Closure and the Fatigue Threshold

Prediction of Fatigue Crack Growth in Vacuum-Brazed Titanium Alloy

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