Fatigue crack growth in miniature specimens: The equivalence of ∆K-correlation and that based on the change in net-section strain energy density

Chandran, K.S. Ravi; Cao, Fei; Newman, James C.

doi:10.1016/j.scriptamat.2016.05.018

Cited by 28 publications

(6 citation statements)

References 11 publications

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“…From crack length (a) and the corresponding recorded MTS cycle count, the crack growth rates, da=dN, were calculated. The change in stress intensity factor (SIF) (ΔK) for each crack tip position was calculated using Equation (1) 22 :…”

Section: Fatigue Experimentationmentioning

confidence: 99%

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Beal,

Salehi,

Kingstedt

2024

Fatigue Fract Eng Mat Struct

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In this study, laser powder bed fusion (LPBF)‐produced Ti‐6Al‐4V is subjected to three separate post‐build heat treatments (HTs), specifically (1) a one‐step annealing HT exceeding the ‐transus temperature, (2) a two‐step annealing HT whose first step exceeds the ‐transus temperature and the second step is an anneal below the ‐transus temperature, and (3) a sawtooth HT with temperatures oscillating below the ‐transus temperature. Tensile properties and fatigue crack growth behavior were assessed and compared to wrought Ti‐6Al‐4V. LPBF materials nominally exhibited a 17% yield stress reduction, 1.9% strain‐to‐failure increase, and 9.2% modulus of toughness decrease. Fatigue crack growth curves were used to assess the linear crack growth rate region and approximate fracture toughness (). Post‐mortem fractography observed striations indicating the crack growth direction frequently changes direction providing an understanding of the slower crack growth rates observed in LPBF materials compared to their wrought counterpart.

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Section: Fatigue Experimentationmentioning

confidence: 99%

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Beal,

Salehi,

Kingstedt

2024

Fatigue Fract Eng Mat Struct

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“…Chandran et al proposed a new, more direct approach based on the net section strain energy amplitude to determine the growth rates of fatigue cracks [29]. The approach used the change in net section strain energy amplitude with crack extension unlike methods based on range of stress intensity factor.…”

Section: Applications Of Sed Approachesmentioning

confidence: 99%

State of the Art Review of the Application of Strain Energy Density in Design Against Fatigue of Welded Joints

Karakaş¹,

Tüzün²

2019

Pamukkale J Eng Sci

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Design of mechanical components against fatigue is vitally important to prevent sudden and unexpected fatigue damage. Due to the complex nature of welded joints because of the changes in material properties due to heat and the geometry of weld beads, designing against fatigue becomes an even more challenging task. Over the years, several methods that can accurately and effectively determine fatigue related parameters were developed. In this paper, a state of the art literature review of studies based on strain energy density (SED) approaches and their use in fatigue evaluations are presented. While a theoretical background is provided, the main focus of the paper is to highlight applications of SED approaches. In order to achieve this objective, papers with varied topics that related to SED are evaluated. Mekanik bileşenlerin yorulmaya karşı tasarımları ani ve beklenmedik yorulma hasarlarını önlemek için hayati önem taşır. Kaynaklı bağlantıların ısı sebebiyle değişen malzeme özellikleri ve kaynak dikişlerinin geometrisinden kaynaklanan karmaşık doğası sebebiyle, yorulmaya karşı tasarlanmaları çok daha zorlu bir görev haline gelmiştir. Yıllar içinde yorulma ile ilgili parametreleri hassas ve efektif şekilde belirleyebilecek yöntemler geliştirilmiştir. Bu makalede, birim şekil değiştirme enerji yoğunluğu yaklaşımlarına ve onların yorulma incelemelerinde kullanımlarına dayanan çalışmaların güncel bir literatür incelemesi sunulmuştur. Teorik bir temelin verilmesi ile birlikte, bu makalenin ana odağı birim şekil değiştirme enerji yoğunluğu yaklaşımlarının uygulamalarını vurgulamaktır. Bu amacı yerine getirmek için, birim şekil değiştirme enerji yoğunluğu ile ilgili çeşitli konulara sahip makaleler incelenmiştir.

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“…Noroozi et al 15,16 wrote a software called UNIGROW in terms of a two‐parameter driving force, without correcting for crack closure but accounting for residual stresses generated in front of the fatigue crack. In addition, other alternative approaches to crack closure have been proposed 17–20 …”

Section: Introductionmentioning

confidence: 99%

“…In addition, other alternative approaches to crack closure have been proposed. [17][18][19][20] It can be noted that 40 years after Elber published his papers 1,2 on crack closure, Wei in 2010 wrote a book on "Fracture Mechanics" 21 with no reference to crack closure and the analyses rested entirely on the role of environment in fatigue damage. But, Hertzberg et al in their book on "Deformation and Fracture Mechanics of Engineering Materials" in the latest 6th edition 22 published in 2022 has reference to crack closure.…”

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confidence: 99%

On 50 years of fatigue crack closure dispute

Kujawski

Ricker

Sadananda

2023

Fatigue Fract Eng Mat Struct

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In this article, we examine the 50 years of observations and interpretations into the subject of fatigue crack closure in lab air and aqueous solutions: disputes and implications. Over this period, several closure concepts have been invoked to explain why the crack propagation threshold ΔKth should reduce with load ratio R. Among these, three types are the most popular and these are closure induced by crack (i) plasticity (PICC), (ii) oxides (OICC), and (iii) roughness (RICC). Therefore, these three and their role in shielding the fatigue crack tip are critically examined. This analysis finds that the reduction in ΔKth with increasing R‐ratio in lab air and aqueous solutions is weakly linked to decreasing crack closure behind the crack tip but strongly related to the access of the environment to the crack tip region and its influence on fatigue damage at and ahead of the crack tip. Supporting evidence for this interpretation comes from the lack of ΔKth dependence on R in a good vacuum (with partial pressure of 10−5 Pa or less). In chemical environments, our viewpoint is supported by a critical analysis of corrosion processes that found that there is insufficient time for most metallic species to form ions, hydrolyze, and transform into hard phases at the crack tip before closure. Therefore, when closure occurs at the crack tip, most of the oxidized metallic species will exist as aquo‐complexes, gel, or colloids that have insufficient shear strength to wedge crack faces during unloading.

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Fatigue crack growth in miniature specimens: The equivalence of ∆K-correlation and that based on the change in net-section strain energy density

Cited by 28 publications

References 11 publications

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

State of the Art Review of the Application of Strain Energy Density in Design Against Fatigue of Welded Joints

On 50 years of fatigue crack closure dispute

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