Article
Mechanics
Reza Masoudi Nejad, Zhiliang Liu
Summary: This paper presents a new method for estimating the fatigue life of engineering components by applying the RICC model under mixed-mode cyclic loading conditions. The method has been successfully applied to CTS specimens with satisfactory results obtained through numerical analysis and experimental tests.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Shiv Sahaya Shukla, K. S. R. K. Murthy
Summary: Mixed-mode fatigue crack growth experiments were conducted using a newly proposed SECC specimen in Al 7075-T6 alloy. An equivalent stress intensify factor (ΔKeq) model based on the GMTS criterion was tested for mixed-mode fatigue crack growth rate correlation and prediction of fatigue life. Different mode mixity configurations were considered and the performance of various ΔKeq models was evaluated.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Monika Duda, Dariusz Rozumek, Michal Smolnicki, Anna Wybraniec
Summary: The article discusses the results of a study on fatigue fracture in mixed and I + II and I + III modes in heat treated steel 42CrMo4. It presents different mechanical properties resulting from various thermal treatments and demonstrates tests conducted on different sample types and load angles. The research aims to enhance understanding of fatigue crack development under mixed modes and provide valuable insights into the material's behavior under complex loads.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Afshin Khatammanesh, Khalil Farhangdoost, Danial Ghahremani Moghadam, Reza Masoudi Nejad
Summary: This paper investigates the fracture behavior of 2024-T351 aluminum alloy under various loading conditions, utilizing a new loading setup and CTST specimens. The study reveals significant coupled effects of modes II and III under mixed mode loading conditions, and demonstrates good consistency between theoretical solutions and experimental observations for different loading conditions.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Mechanics
Qikun Xie, Hongyu Qi, Shaolin Li, Xiaoguang Yang, Duoqi Shi
Summary: One of the most common damage modes of aero-engine hot-end components is crack, which is typically in a mixed-mode and under elastoplastic conditions due to the complicated geometry and harsh working environment. The phase-field fracture method has recently attracted extensive attention as a numerical simulation method. However, attention toward material damage and crack initiation before the crack emerges is lacking in solving the problem of elasto-plastic mixed-mode fatigue crack propagation. In this study, an enhanced phase-field fracture method is used to address this issue and predict the propagation behavior of the elastoplastic mixed-mode fatigue crack. The effect of some parameters of this model is analyzed. This achievement is a significant contribution to the safety of aircraft engines and a novel method that can be further improved to solve problems in the future.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Florian Paysan, Eric Breitbarth
Summary: This study investigates plasticity-induced crack closure in AA2024 aluminium sheet material under constant amplitude loading from a three-dimensional perspective. The results show that crack closure is present up to a load ratio of R = 0.3, and the contact pressure distributions are strongly influenced by the stress intensity factors and sheet thicknesses.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Mechanics
Shiv Sahaya Shukla, S. Sajith, K. S. R. K. Murthy
Summary: A simple and efficient specimen geometry for mixed mode (I/II) fracture tests and fatigue crack growth studies has been proposed in this investigation. Through extensive finite element analyses and experimental studies, the proposed specimen geometry shows good agreement with widely used fracture criteria in terms of fracture toughness, indicating its practicality.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Ioannis Sioutis, Konstantinos Tserpes
Summary: A mixed-mode fatigue crack growth model was developed to simulate interfacial fracture of co-consolidated thermoplastic joints. The model uses the cohesive zone modeling approach and is capable of considering any I + II mode-mixity by using pure mode I and II loading data as input. The fatigue crack growth rate is updated in real-time based on the energy release rates and mode-mixity ratio. It accurately reproduces the mode I and II fatigue crack growth and predicts the mixed-mode fatigue crack growth of the tested specimens.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Monika Duda, Dariusz Rozumek, Grzegorz Lesiuk, Michal Smolnicki, Bartosz Babiarczuk, Joanna Warycha
Summary: This paper presents the results of an experimental investigation on fatigue crack development in heat-treated 42CrMo4 steel under mixed-mode I + II and I + III. The tests were conducted using compact tension shear specimens and rectangular cross-section specimens for mixed-mode I + III. The paper also discusses the fracture analysis results of fatigue crack path development.
INTERNATIONAL JOURNAL OF FRACTURE
(2022)
Article
Mechanics
Qikun Xie, Hongyu Qi, Shaolin Li, Xiaoguang Yang, Duoqi Shi
Summary: This study investigates the fatigue cracking of aeroengine hot-end components, particularly the mixed-mode cracking at high temperature. Experimental tests and adaptive finite element method are used to verify the accuracy of different models. The findings show that the angle dependent models have better accuracy at 550℃, and the crack propagation rate exhibits a different pattern compared to that at room temperature.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Maria Pilar Valles Gonzalez, Alejandro Gonzalez Meije, Ana Pastor Muro, Maria Garcia-Martinez, Beatriz Gonzalez Caballero
Summary: The study analyzed multiple fracture cases of fuel control pressure tubes from aircraft engines, finding that the fractures originated from defects in the outer wall of the tube and ultimately resulted in overload fracture.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Abhay K. Singh, Siddhant Datta, Aditi Chattopadhyay, Nam Phan
Summary: The investigation explored the effects of overload mode-mixity on crack growth behavior and micro-mechanisms of AA7075 T6, revealing an increase in fatigue life and crack retardation under mix-mode overload conditions. Microscale analysis showed distinct fracture features in different overload regions.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Francisco Maciel Monticeli, Herman J. C. Voorwald, Maria Odila H. Cioffi
Summary: A mechanistic model for mode I fatigue delamination growth based on the hybrid fiber bridging zone is developed and described. The model incorporates microfracture mechanisms of striation, fiber peeloff, and fiber bridging stress, measured through scanning electron microscopy analysis. Moreover, it considers the effects of carbon and glass fiber delamination features at the microscopic level to predict the crack propagation behavior in a hybrid laminate. The experimental SERR based on the fiber bridging zone model is used as the similitude parameter for crack growth rate, following a power law.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
J. S. Jesus, L. P. Borrego, J. A. M. Ferreira, R. Branco, J. D. Costa, C. Capela
Summary: Mode I and mode I + II fatigue crack growth experiments were conducted using compaction tension shear specimens made of Ti-6Al-4V by additive manufacturing at various loading angles. The performance of different methodologies used to determine the equivalent stress intensity factor was studied. It was found that simpler methods achieved good results when considering the crack deflection angle in the algorithm. The crack growth speed was not significantly affected by the similar values of crack deflection angle, predominance of mode I loading, and similar crack closure effect.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Shuancheng Wang, Bing Yang, Jian Li, Shuwei Zhou, Shoune Xiao
Summary: In this paper, a theoretical analytical solution of the Christopher-James-Patterson (CJP) model in mixed mode is presented, considering the influence of roughness-induced crack closure (RICC) on fatigue crack growth. A new effective stress intensity factor range (ΔKP-R) is proposed as the driving force for crack propagation. Experimental testing showed that both the 8% compliance offset criterion and the parabolic-line method were suitable for determining the crack-opening force. The solution includes plasticity-induced crack closure (PICC) and RICC effects, providing a more effective description of crack propagation behavior.
ENGINEERING FRACTURE MECHANICS
(2023)
Review
Computer Science, Interdisciplinary Applications
M. Smolnicki, G. Lesiuk, Sz Duda, A. M. P. de Jesus
Summary: This article reviews different approaches to finite element analysis of fibre metal laminates based on published articles and the authors' own experiences. The interface between the metal and the composite layer is highlighted as a crucial factor in modelling fibre metal laminates. The quality of the different approaches is evaluated based on literature review and own research.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Mechanical
H. Krechkovska, M. Hredil, O. Student, L. Svirska, S. Krechkovska, I. Tsybailo, P. Solovei
Summary: The article discusses the causes of failures of steam turbine rotor blades made of high-alloyed heat-resistant steel 15Kh11MF. Technological defects such as welding and surface hardening imperfections lead to premature failure of the blades. These defects initiate cracks, changing the natural oscillation frequency of the blades and causing resonance and overload. The corrosive steam-water mixture in the phase transition zone contributes to the fracture process. Long-term operation of the steel in steam turbines leads to the precipitation of carbides along the grain boundaries, weakening cohesion between adjacent grains and forming defects comparable to grain size.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Civil
Michal Smolnicki, Szymon Duda, Pawel Zielonka, Pawel Stabla, Grzegorz Lesiuk, Cristiane Caroline Campos Lopes
Summary: In this paper, the fracture properties of pultruded GFRP bars are investigated using the double cantilever beam test (DCB) under mode I loading. Due to the presence of the R-curve effect, a nonstandard approach is introduced to determine fracture properties. A mixed experimental-numerical approach is proposed, with numerical simulations carried out in Simulia Abaqus and Python scripting used to generate models and obtain R-curve for the material. The agreement between the numerical model and experimental results allows its use in analyzing more complex structures. Introducing acoustic emission analysis as an auxiliary technique, the delamination observed in both the numerical model and experiment correlates with registered acoustic emission events. The proposed method can be applied to prepare material models for other composite materials displaying the R-curve effect.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Volodymyr Vira, Halyna Krechkovska, Volodymyr Kulyk, Zoia Duriagina, Oleksandra Student, Bogdan Vasyliv, Veronika Cherkes, Tetiana Loskutova
Summary: This study presents the findings from metallographic studies and tests on the tensile, impact, and fatigue crack growth resistance of 17H1S main gas pipeline steel in two different states. Non-metallic inclusions forming chains were found in the microstructure of the steel after long-term operation. The lowest values of elongation and impact toughness were observed in the lower part of the pipe close to its inner surface. The fatigue crack growth tests showed a more pronounced degradation effect at a higher stress ratio.
Review
Materials Science, Multidisciplinary
Ruben D. F. S. Costa, Rita C. M. Sales-Contini, Francisco J. G. Silva, Naiara Sebbe, Abilio M. P. Jesus
Summary: This paper summarizes the drilling and milling processes in Fiber Metal Laminates (FMLs) based on a literature review from 2000 to 2023. It analyzes and discusses the parameters used in multi-material manufacturing and machining, as well as the machining process parameters related to sustainability. SWOT analysis identifies opportunities for improvement in surface treatment of aluminum alloys, testing non-traditional manufacturing modes, and developing sustainable techniques in FML manufacturing. Opportunities in tooling relate to tool coatings and adjusting machining parameters for optimum finished parts. To enhance sustainability, testing coated drills under cryogenic conditions to reduce lubricant usage is necessary.
Article
Materials Science, Multidisciplinary
Felipe Klein Fiorentin, Luis Reis, Grzegorz Lesiuk, Ana Reis, Abilio de Jesus
Summary: A trend of increasing excitation frequencies in fatigue testing has been observed due to advances in control and excitation systems. While high testing frequencies save time and money, they also pose challenges for measurement systems and temperature control. Being able to predict and control sample temperature is essential in high frequency fatigue testing.
Article
Engineering, Civil
X. Y. Long, R. Branco, W. Macek, R. Masoudi Nejad, G. Lesiuk, S. P. Zhu, A. M. Amaro
Summary: This paper investigated the cyclic deformation behavior of multiphase low-carbon steel after austempering heat treatments at four different temperatures. The steel showed a bainite/martensite microstructure, with increasing bainite content at higher austempering temperatures. The steel strain-hardened during the first two cycles and then strain-softened until failure. The austempering temperature did not significantly affect the stress-based, strain-based, and energy-based relationships, but lower austempering temperatures slightly improved fatigue performance.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Engineering, Civil
M. Smolnicki, Sz. Duda, P. Stabla, P. Zielonka, G. Lesiuk
Summary: This paper presents preliminary studies on the failure analysis of hybrid composite materials using acoustic emission and machine learning. Machine learning techniques were used to better cluster the data obtained from acoustic emission. The study focused on data preparation, feature extraction, determination of cluster number, and testing three clustering techniques. The proposed method was successfully used to cluster the obtained data.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Halyna Krechkovska, Oleksandra Student, Olha Zvirko, Myroslava Hredil, Lesya Svirska, Ivan Tsybailo, Petro Solovei
Summary: This paper discusses the metallographic studies and mechanical testing results of 15Kh1M1F steel in the initial and long-term operation state in the steam pipeline of TPP. The adverse impact of TPP unit shutdowns on the steel's structural and mechanical state is attributed to cyclic thermal stresses in the pipe walls. Structural changes in the metal and fractographic signs of degradation were observed, and the proportion of intergranular fracture on the fracture surfaces was proposed as a quantitative indicator of the steel's degradation. The critical state of the steel was substantiated based on the mechanical property changes and fractographic features.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
Ding Liao, Shun-Peng Zhu, Jie-Wei Gao, Jose Correia, Rui Calcada, Grzegorz Lesiuk
Summary: In the history of fatigue study, the potential of strain energy density (SED) based approaches were discovered but not widely used in engineering due to the lack of accepted fatigue model and operating instruction. This study provides a normative form of total strain energy density (TSED) based fatigue life equation and a standard flow to determine SED-related material fatigue parameters, aiming to promote its application in engineering. The TSED formula proves to be more effective than the strain-based Coffin-Manson-Basquin equation in correlating fatigue life.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Editorial Material
Materials Science, Multidisciplinary
Cristiano Fragassa, Grzegorz Lesiuk, Jeremy Epp
Article
Chemistry, Multidisciplinary
Vitor M. G. Gomes, Sven Eck, Abilio M. P. De Jesus
Summary: The fatigue behavior of 51CrV4 steel, applicable to the crossing nose component, was evaluated under strain-controlled conditions using both strain-life and energy-life approaches. A Ramberg-Osgood cyclic elasto-plastic curve was obtained to consider the results. The isotropic and kinematic cyclic hardening behavior of the Chaboche model was also analyzed. The material properties and finite element model parameters obtained in this study contribute to the literature on strain-life fatigue and cyclic plasticity, and can be applied in mechanical designs with 51CrV4 steel components or other future analyses.
APPLIED SCIENCES-BASEL
(2023)
