Article
Engineering, Multidisciplinary
Christopher Meninno, Vijaya Chalivendra
Summary: The study investigated the impact of different laminate orientations on mode-I and mode-II fracture toughness, as well as the correlation between fracture toughness values and scanning electron microscopy images. The results showed that C-0-G-90 composites exhibited higher mode-I fracture toughness, while G-0-C-90 composites showed higher mode-II fracture toughness. The electrical response was found to be closely related to crack dynamics.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Composites
Rui He, Longfei Cheng, Yidi Gao, Hao Cui, Yulong Li
Summary: This paper investigates the effect of in-plane shear stress on the fiber kinking compressive fracture toughness of laminates using compact compression specimens with off-axis fibers. The results show that in-plane shear stress increases the values of the R-curves, leading to an increase in energy dissipation. Microscopic morphology reveals the increasing splitting of fiber bundles and subsequent fiber compression failure as the off-axis angle of the fibers increases.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
B. Mohammadi, M. M. Shokrieh, M. Jamali, A. Mahmoudi, B. Fazlali
Summary: This study investigated the capability of the damage-entropy model in predicting fatigue life of off-axis unidirectional composites. It considered the microcontinuum damage mechanics and fracture fatigue entropy as a fatigue failure criterion, taking into account self-heating, temperature evolution, and viscoelastic properties. The model was validated through experiments on T800H/2500 and E-glass/epoxy composites, showing good agreement between predicted and experimental fatigue life.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Peyman Gholami
Summary: This study aims to define a fuzzy fatigue damage model (FFDM) based on the continuum damage mechanics (CDM) model to predict the fatigue life of composite laminates under cyclic conditions. Experimental data is fitted using fuzzy linear regression to estimate the unknown parameters of the CDM-based damage model. The proposed model considers uncertainty sources in stiffness reduction and can estimate the lower and upper bounds of a fatigue life of composite laminates.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Engineering, Mechanical
Ali Mahmoudi, M. M. Khonsari
Summary: A new method based on the fracture fatigue entropy (FFE) criterion is proposed to predict the fatigue life of metals. This method utilizes the concept of kinetic strength of solid materials to rapidly predict the cyclic plastic strain energy and temperature evolution. Experimental results for Al 7075-T6, LCS 1018, API 5L X52, and MCS 1045 are compared with theoretical predictions, demonstrating that this model can reliably predict the temperature evolution, plastic strain energy dissipation, and fatigue life of metals.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Composites
Mohammad Nadjafi, Peyman Gholami
Summary: This paper investigates the failure probability prediction of composite laminates under fatigue loading. The failure probability of pin-loaded composite laminates in different directions is predicted using the continuum damage mechanics theory combined with Monte Carlo Simulation. The failure function is formed using the CDM theory and identified random variables, and the failure probability is obtained and visualized through Monte Carlo Simulation.
COMPOSITES COMMUNICATIONS
(2022)
Article
Engineering, Manufacturing
Rui He, Yidi Gao, Longfei Cheng, Hao Cui, Yulong Li
Summary: This paper characterizes the dynamic fracture toughness of laminated composites in fibre kinking mode and its evolution with crack growth at high loading rates. The study found that the fracture toughness remains constant at the initiation of fibre kinking damage, but decreases noticeably during the kinking band growth stage at higher loading rates. Two different types of damage evolution were observed depending on the amount of delamination involved.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Chemistry, Physical
Simon Moser, Yanxia Feng, Oncay Yasa, Stefanie Heyden, Michael Kessler, Esther Amstad, Eric R. Dufresne, Robert K. Katzschmann, Robert W. Style
Summary: Inspired by the cellular design of plant tissue, this study presents a method for making versatile, tough, highly water-swelling composites. By embedding highly swelling hydrogel particles inside tough, water-permeable, elastomeric matrices, the resulting composites inherit the properties of both hydrogels and elastomers. These hydroelastomers are easy to fabricate, based on widely-available materials, and can be molded or extruded into complex swelling geometries, making them excellent candidates for soft robotics and swelling-based actuation.
Article
Nanoscience & Nanotechnology
Mei-Yue Li, Zhe-Xuan Wang, Bin Zhang, Fei Liang, Xue-Mei Luo, Guang-Ping Zhang
Summary: This study investigated the fatigue strength of nanocrystalline Ni/Ni-W laminated composites. The results showed that the fatigue resistance of the Ni/Ni-W laminated composites was improved compared to monotonic Ni. Shear banding and voiding were identified as the two dominant modes of fatigue damage in the composites. A deformation map was proposed to explain the critical conditions and transition of shear bands and voids. The introduction of ultrathin Ni-W layers hindered crack propagation across the heterogeneous interface, leading to improved fatigue strength.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Jia Yang, Weihang Liu, Mengchun Fu, Jiawen Wen, Ke Li, Panpan Lin, Ce Wang, Peng He, Tiesong Lin, Han Mei, Yue Liu
Summary: SiCf/SiC composite and Al0.3CoCrFeNi high-entropy alloys, two promising candidate materials for nuclear reactors, were successfully brazed together with a maximum strength of 59 MPa at room temperature and 49 MPa at 700 degrees C. The study uniquely considered the high-entropy effect and its deviation caused by elemental segregation during brazing. It was found that the presence of Si from ceramics or Ti from fillers can cause segregation and raise doubts about the efficacy of high-entropy alloys in brazing certain materials. The study also analyzed the microstructural evolution, mechanical properties, and fracture modes of the joints, observing metal atom erosion to the SiCf/SiC composite in a fiber-orientation-dependent manner.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Mohammad Rouhi Moghanlou, M. M. Khonsari
Summary: The study uses the kinetic concept to determine the fatigue life of materials and evaluate the fracture fatigue entropy. The results indicate a good agreement between the predicted model and experimental data, providing further evidence for the constancy of fracture fatigue entropy.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Automation & Control Systems
Xiaofeng Liu, Fan Ai, Lin Bo, Kaiquan Pu, Honglin Luo, Daiping Wei
Summary: The article presents a method for detecting and quantifying fatigue damage in composite laminates using cross recurrence plots and support vector data description models. The proposed method integrates data from diagnostic paths to establish a unified damage index for quantifying fatigue damage under cyclic loading conditions. The feasibility of the method is validated using simulation data and fatigue damage progression data from NASA prognostics data repository.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2021)
Review
Materials Science, Ceramics
Jinsong Yang, Jinlu Chen, Fang Ye, Laifei Cheng, Yi Zhang
Summary: This review summarizes the synthesis processes and applications of high-temperature atomically laminated materials such as graphite, hexagonal boron nitride (h-BN), and MAX phases. It also analyzes the differences in mechanical performance between these materials and isotropic materials, and looks forward to their future development in toughening applications.
CERAMICS INTERNATIONAL
(2022)
Article
Mechanics
A. H. Mirzaei, M. M. Shokrieh, A. Saeedi
Summary: The fatigue behavior of carbon/epoxy laminated composites with/without embedded SMA wires was investigated and a new fatigue model was proposed to predict their behavior.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Manufacturing
Zia Mahboob, Zouheir Fawaz, Habiba Bougherara
Summary: This article re-evaluates Flax-reinforcement as an alternative to Glass through fatigue testing using constant strain-amplitude. The study finds that Flax-epoxy specimens have superior resistance to stiffness loss, lower inelastic strains, and higher stress capacity compared to similar Glass-specimens.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Mechanical
Ali Mahmoudi, M. M. Khonsari
Summary: A new method based on the fracture fatigue entropy (FFE) criterion is proposed to predict the fatigue life of metals. This method utilizes the concept of kinetic strength of solid materials to rapidly predict the cyclic plastic strain energy and temperature evolution. Experimental results for Al 7075-T6, LCS 1018, API 5L X52, and MCS 1045 are compared with theoretical predictions, demonstrating that this model can reliably predict the temperature evolution, plastic strain energy dissipation, and fatigue life of metals.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Arash P. Jirandehi, Ali Haghshenas, M. M. Khonsari
Summary: In this study, fully-reversed bending fatigue and impulse excitation tests were conducted to investigate the behavior of High Carbon Steel (HCS) at different environmental temperatures. It was found that with increasing environmental temperature, the specimens tended to become more brittle, leading to a decrease in fatigue life.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Chemical
Soroosh Salehi, Sahar Ghatrehsamani, Saleh Akbarzadeh, M. M. Khonsari
Summary: This paper presents an experimental procedure and a thermodynamic methodology for evaluating adhesive wear in systems with variable and sequential speeds. The continuum damage mechanics (CDM) is used to estimate the probability of asperities forming wear particles and derive the wear coefficient. The results show that the wear coefficient in descending cases is higher than in ascending velocity experiments. Additionally, Archard's law is not suitable for predicting wear volume in situations with variable speeds.
Article
Physics, Multidisciplinary
Mohammad A. Amooie, K. P. Lijesh, Ali Mahmoudi, Elaheh Azizian-Farsani, Michael M. Khonsari
Summary: The effect of sudden variations in working modes and fatigue behavior of CS 1018 is studied using a general model based on the concept of fracture fatigue entropy (FFE). Fully reversed bending tests are conducted on dog bone specimens with variable frequency tests to simulate fluctuating working conditions. The results show that regardless of frequency changes, FFE remains constant and within a narrow band range, similar to a constant frequency.
Article
Engineering, Mechanical
Ali Mahmoudi, Michael M. Khonsari
Summary: This article discusses four different experimental approaches for rapidly estimating the fatigue limit (endurance limit) based on energy dissipation during cyclic loading. These approaches utilize energy dissipation and thermography, and can accurately evaluate the fatigue limit of a material through fatigue testing on a single specimen. The results show that the trend of energy dissipation can be used to predict the fatigue limit by observing changes in released energy due to damage accumulation at stress levels above the fatigue limit. Experimental results on CS 1018 and SS 304 specimens are presented to demonstrate the efficacy of the proposed methods.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Mohammad A. Amooie, M. M. Khonsari
Summary: This study investigates the fracture behavior of carbon steel 1018 in low-temperature environments. Fully-reversed bending experimental tests were performed to examine the efficacy of using Fracture Fatigue Entropy (FFE) concept for predicting fatigue life at different environmental temperatures. The results show that lower operating temperatures can improve fatigue life of carbon steel. Additionally, FFE remains nearly constant and can be used for reliable prediction of fatigue life at different environmental temperatures. Illustrative examples are provided to demonstrate the utility of this approach for prediction purposes.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
A. Mahmoudi, M. R. Khosravani, M. M. Khonsari, Tamara Reinicke
Summary: This study investigates the accumulated entropy at the crack tip of a semi-circular bending (SCB) specimen to determine the threshold for material fracture and interatomic debonding. The plastic flow at the crack tip is measured using the Digital Image Correlation (DIC) technique and strain maps superposed to SCB specimens. The generated entropy at the crack tip reaches a critical limit, beyond which bond breakage occurs, leading to crack surface propagation.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Ali Mahmoudi, Mohammad A. Amooie, Lijesh Koottaparambil, Michael M. Khonsari
Summary: This study introduces a reliable technique for predicting the remaining useful life of components by measuring the temperature signature when the operating frequency is rapidly changed. The approach is validated through fatigue tests on stainless steel specimens. The method allows for predicting the remaining useful life at different operating frequencies.
Article
Materials Science, Multidisciplinary
Ali Mahmoudi, Arash P. Jirandehi, Mohammad Ali Amooie, M. M. Khonsari
Summary: A reliable approach based on an entropy-damage model is introduced for assessing the remaining useful fatigue life. Two damage models are evaluated, and the entropy-based approach using infrared thermography shows enhanced precision and stable tracking of damage evolution. It successfully predicts the remaining useful life and can handle variable load sequencing without knowing the loading history.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
A. Mahmoudi, M. M. Khonsari
Summary: This research proposes a simple and efficient method for extracting the fatigue curve of materials within the framework of thermodynamics. By measuring the temperature rise, the fatigue life of the material can be predicted and the S-N curve can be created successfully.
EXPERIMENTAL MECHANICS
(2023)
