Article
Engineering, Mechanical
M. Moattari, M. M. Shokrieh, H. Moshayedi
Summary: The present study focuses on investigating the influence and interaction of crack-tip geometrical constraints and welding residual stresses (WRS) on fracture behavior of IN939 superalloy. Results show that geometrical constraints have a more evident impact on WRS. Unexpected fracture behavior may occur when the WRS changes from tensile to compressive near the crack tip.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
Weidong Lu, Chunguo Zhang, Shuai Luan
Summary: In this study, the effect of overload-induced residual stress (RS) behind and ahead of the crack tip on fatigue behavior was analyzed. Fatigue crack growth measurements were performed under constant stress intensity and different stress ratios for the same overload, and the compliance curves of the cracks were analyzed. The results showed that the contribution of crack closure-dependent RS behind the crack tip to fatigue retardation is caused by the variation of crack opening stress intensity, and the influence of crack closure is determined by both effective RS and the contact length of the crack wake behind the crack tip.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Prabhu Murugesan, Youngbin Lim, Sunghwan Jung, Hyungyil Lee
Summary: The study proposes to generate compressive residual stress at the crack tip in bulk metal by introducing acoustic cavitation, which effectively retards crack growth. The experiments conducted using pre-cracked specimens showed that acoustic cavitation can produce significant compressive residual stress at the crack tip, offering potential applications in extending material fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Wei Liu, Yanwei Dai, Yinghua Liu, Weichen Kong
Summary: In this paper, the effects of nonproportional loading and residual stresses on creep crack tip fields are systematically investigated. The novel interpretation of C(t)-integral considering residual stress is used for the study. It is found that residual stress significantly affects the C(t)-integral level in small scale creep conditions, but not the level of C*-integral in the presence of large-scale creep. Loading path has a significant influence on C(t)-integral under small scale creep, while C*-integral is independent of the loading path if the creep time is long enough. The study deepens the understanding of the effects of residual stress and nonproportional loading on creep crack tip field.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Seung-Ho Lee, Hyun-Woo Jung, Yun-Jae Kim, Kamran Nikbin, Robert A. Ainsworth
Summary: This study analyzes 316H creep crack growth data at 550 degrees C to investigate the effect of inplane constraint on creep crack initiation times. A constraint parameter is proposed to quantify the difference between actual opening stress and the Riedel-Rice opening stress field, using experimentally measured C*. The analysis shows that creep crack initiation times can be well characterized by the C* integral with the proposed parameter, and a modified model suggests a reduction in scatter in predictions from -40 to -5.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
R. Sunder, Devaraj Raut, Vikram Jayaram, Praveen Kumar, Vijayendra Shastri
Summary: The closure-free intrinsic threshold stress intensity Delta Kth,i is significantly influenced by near-tip residual stress, as observed in experiments using marker loads on 7075-T6 Al-alloy specimens. This effect is similar to a "micro latency" phenomenon, with variations correlating with Delta Kth,i under different gaseous environments and hold time experiment conditions. The study confirms that near-tip residual stress acts as an independent load interaction mechanism affecting fatigue crack growth rates under closure-free conditions.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Yanwei Dai, Fei Qin, Yinghua Liu, Haofeng Chen
Summary: In this paper, the material mismatch effect on the interface creep crack tip field is studied. It is found that the material mismatch constraint effect decreases with the increase of the local mismatch factor.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Shuai Luan, Chunguo Zhang, Xing Zhang
Summary: This study clarifies the redistribution of residual stress (RS) during fatigue crack growth (FCG) in a welded joint. The results show that RS redistribution depends on the distance between the crack tip and the weld centerline, and the RS at the crack tip is always compressive. Additionally, the length of the contacted crack wake gradually increases, leading to a decrease in FCG rate.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Nipal Deka, Krishna N. Jonnalagadda
Summary: A small-scale low crack tip constraint fracture specimen for ductile FCC single crystals was proposed and analyzed in this study. Different crack orientations were studied, showing the dominance of forward localization band. The study provides insights into strain localization in ductile single crystals and the possible existence of kink shear bands under mixed mode loading.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Engineering, Multidisciplinary
H. S. Lai, K. L. Liu, L. Z. Gong, P. Xu
Summary: The research focused on the creep crack-tip stress field of power-law creep materials with threshold stress, developing a two-term asymptotic expansion prediction method. The study found that this method accurately estimates the crack-tip stress field and is directly applicable to the estimation of the time-dependent C-integral.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Chemistry, Physical
Diogo M. Neto, Micael F. Borges, Edmundo R. Sergio, Fernando Antunes
Summary: This study numerically investigated the effect of thermal residual stresses (TRSs) on fatigue crack growth (FCG), revealing that compressive stresses delay FCG while tensile stresses accelerate it. The research also found that TRSs only affect FCG by changing the crack closure level.
Article
Mechanics
Xingling Huang
Summary: A new analytical solution for plastic zone size is proposed for mixed mode I/II cracks using the von Mises yield criterion, and the theoretical relationship between plastic zone size and in-plane and out-of-plane T-stresses is determined. Three constraint parameters are derived from plastic zone sizes and area, and the influences of T-stresses and mode mixity on plastic zones are investigated. The combined effects of in-plane and out-of-plane T-stresses on fracture toughness are analyzed, and linear correlations between constraint parameters and fracture toughness are observed.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Prabhu Murugesan, Sunghwan Jung, Hyungyil Lee
Summary: We propose combining the crack tip stress field with acoustic cavitation to generate compressive residual stress at the difficult-to-reach crack tip in bulk metal. The increasing stress profile at the crack tip amplifies plastic deformation induced by local impacts from acoustic cavitation, enhancing the generation of compressive residual stress. Experimental investigation confirms that the crack tip stress field can increase cavitation-based compressive residual stress by up to three times. The stress intensity factor of the crack tip stress field represents the engagement with cavitation-based compressive residual stress generation.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Chunguo Zhang, Weidong Lu
Summary: This study clarifies the impact of overload on fatigue crack growth rate by enhancing the residual stress contribution behind and ahead of the crack tip and the relationship with crack closure effects. The results indicate that overload-induced residual stress contribution is a key factor in post-overload fatigue crack growth rate, exhibiting different mechanisms behind and ahead of the crack tip.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Thermodynamics
Soumyadeep Mondal, Servesh Kumar Agnihotri, Anshul Faye
Summary: This study deals with the structure of the thermo-mechanical stress field near the crack-tip in a graded material. The Navies equation for a thermo-mechanical system is solved using the Eigenfunction expansion approach. The results show that the heat flux near the crack-tip exhibits singular behavior in the radial and angular directions, while no singularity is observed in the direction of gradation. The effect of temperature is mainly observed in the out-of-plane normal stress and helps relax the constraint ahead of the crack-tip when the structure is constrained in the thickness direction.
JOURNAL OF THERMAL STRESSES
(2022)
Article
Automation & Control Systems
H. Mohammadzadeh Jamalian, M. Farahani, M. K. Besharati Givi, M. Aghaei Vafaei
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2016)
Article
Automation & Control Systems
M. Tabasi, M. Farahani, M. K. Besharati Givi, M. Farzami, A. Moharami
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2016)
Article
Engineering, Manufacturing
M. Sabokrouh, S. H. Hashemi, M. R. Farahani
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2017)
Article
Engineering, Manufacturing
Setayesh Hakkak Zargar, Mohammadreza Farahani, Mohamad Kazem Besharati Givi
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2016)
Correction
Engineering, Chemical
M. Kaji, M. Farahani, M. A. Ansari
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2017)
Article
Engineering, Chemical
Fayyaz Nosouhi, Mohammadreza Farahani, Mahdi Ansari
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2018)
Article
Engineering, Chemical
Pouyan Ghabezi, Mohammad Reza Farahani
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2017)
Article
Engineering, Chemical
Mohammadreza Kaji, Mohammadreza Farahani, Mahdi Ansari
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2017)
Article
Engineering, Mechanical
Hossein Andalib, Mohammadreza Farahani, Moeen Enami
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2018)
Article
Engineering, Manufacturing
Mojtaba Rezaee Hajideh, Mohammadreza Farahani, Seyed Amir Davoud Alavi, Navid Molla Ramezani
JOURNAL OF MANUFACTURING PROCESSES
(2017)
Article
Engineering, Chemical
F. Heidarpour, M. Farahani, P. Ghabezi
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2018)
Article
Materials Science, Composites
P. Ghabezi, M. Farahani
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2018)
Article
Engineering, Manufacturing
Mojtaba Rezaee Hajideh, Mohammadreza Farahani, Navid Molla Ramezani
JOURNAL OF MANUFACTURING PROCESSES
(2018)
Article
Computer Science, Information Systems
Omid Sam-Daliri, Lisa-Marie Faller, Mohammadreza Farahani, Ali Roshanghias, Hannes Oberlercher, Tobias Mitterer, Alireza Araee, Hubert Zangl
Review
Materials Science, Multidisciplinary
P. Ghabezi, M. Farahani
REVIEWS OF ADHESION AND ADHESIVES
(2017)