Article
Engineering, Mechanical
Jie Li, Chenggong Guo
Summary: This study presents a unified concrete damage model capable of describing both monotonic and fatigue loading scenarios. It incorporates the concept of stochastic damage mechanics and utilizes the micro spring in the micro-meso stochastic fracture model (MMSF) as an energy dissipation element. By employing the rate process theory and a crack hierarchy model, the model successfully captures the multiscale energy dissipation process of the micro spring. It also analyzes the underlying damage mechanisms associated with monotonic and fatigue loading.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Construction & Building Technology
Miaoyan Liu, Jun Lu, Pan Ming, Jia Song
Summary: This study investigates the entire process of concrete damage by monitoring the damage process of concrete beams under monotonic and fatigue loading in real-time using acoustic emission (AE). It analyzes the changes in RA/AF and b-value, correlation dimension, and time-frequency during the damage process. The results showed that the damage process of concrete is divided into four stages, the key points of the damage process can be accurately extracted using parameter analysis, and the dominant frequency of AE at the key points is smaller. Changes in AF/RA and b-value indicate that the shear crack eventually causes the specimen's damage. In addition, the correlation between the b-value and the correlation dimension illustrates that the crack change within the concrete is an orderly process developing from disorder. The study's findings can provide a reference for the stability monitoring and damage prediction of concrete structures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mechanics
Yugui Cao, Longlong Li, Muyu Liu, Yufei Wu
Summary: The study found that under CFRP confinement, the compressive strength and ultimate strain of rubber concrete decrease with increasing rubber volume replacement ratio, while the stiffness of confinement also decreases with increasing rubber content.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Yasmin Lemcherreq, Carlos Zanuy, Thomas Vogel, Walter Kaufmann
Summary: This paper presents the results of an experimental study on pull-out specimens, which were instrumented with refined strain measurement techniques. The study revealed non-uniform force transfer and redistribution between concrete and reinforcement along the bond length under static and repeated loading. The variation of bond stresses along the bond length is important for fatigue studies. The experiments also showed that the residual nominal bond strength after repeated loading remains relatively unchanged, and the redistribution capacity plays a role in this.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Alessandro Pisapia, Elide Nastri, Vincenzo Piluso, Antonio Formisano, Federico Massimo Mazzolani
Summary: In this paper, an extensive experimental campaign is conducted on 5000, 6000 and 7000 aluminium series to characterize their behavior in terms of stress-strain curve, low cycle fatigue, cyclic hardening, dissipated energy and plastic fracture. The knowledge gained from this research can be beneficial for understanding the nonlinear behavior of these alloys, particularly under seismic loading. The collected information is also important for the revision of the new Eurocode 8, which includes a section on seismic design of structures made of aluminium alloys.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Pio Michele Giuliani, Oliviero Giannini, Riccardo Panciroli
Summary: Traditional composites like glass and carbon fiber reinforced polymers exhibit linear-elastic behavior with brittle failure, while natural fiber-reinforced composites like flax fiber composites show non-linear elasticity and plastic strains before failure. The study highlights the need for a complex material model to predict the mechanical behavior of flax-based composites due to the unique characteristics of the material.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Ocean
Selase Kwame Mantey, Yi Zhang, Jianqun Jiang, Evans Amponsah, Zhenyu Wang
Summary: This study investigates the damage accumulation process of grouted connections of offshore wind turbines under variable axial fatigue load. Through cyclic compression tests and finite element numerical simulations, it is found that the grout damage under low load range can be accelerated by sudden large loads, and larger load range results in greater damage accumulation and reduced bearing capacity of the connection.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Mechanical
Andreas Hottin, Moussa Nait Abdelaziz, Abderrahim Talha, P. Charrier
Summary: The continuum damage mechanics approach allows quantifying material degradation using a damage variable D. A new equivalent stress is developed to analyze multiaxial fatigue in rubbers, which is validated through fatigue experiments on Natural Rubber and comparison with data on Styrene Butadiene Rubber. The nice agreement between experimental data and model estimates in terms of fatigue life makes this approach a robust tool for designing rubber parts.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
Karlo Seles, Zoran Tomic, Zdenko Tonkovic
Summary: This study aims to model complex fracture and fatigue processes in microstructural geometries of nodular cast iron using a recently developed generalised phase-field formulation. The results demonstrate the ability of the proposed model to reproduce crack nucleation and complex crack propagation patterns, as well as present features of low- and high-cyclic fatigue regime.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Marine
Roozbeh Rezanejad Malakshah, Majid Moradi, Amin Rashidi Mehrabadi, Abbas Ghalandarzadeh
Summary: Soil scour can greatly reduce the lateral capacity and stiffness of offshore piles, particularly monopiles, due to their shallow embedment depth. A centrifuge model was used to investigate the effect of different scour geometries on the lateral behavior of a monopile through cyclic and monotonic loading tests. The results showed a significant decrease in lateral capacity under scour conditions, with 1D-local scour causing a 30% reduction. Post-scour p-y curves were derived and revealed that the effect of local scour on the curves becomes negligible after a specific depth. Cyclic tests also demonstrated the considerable impact of scour on soil-pile stiffness and accumulated lateral displacement, leading to modifications in the previously proposed model for accumulated displacement to incorporate scour effects.
Article
Engineering, Mechanical
Zheng Pan, Yaling Lai, Yanping Wang, Wuwei Duan, Yu Qiao, Yuanwen Liu, Chengkai Song
Summary: The experimental study on rubber specimens revealed that the multiaxial fatigue life increases with decreasing strain amplitude. The loading path significantly influences the fatigue life of vulcanized natural rubber. The SWT model and CXH model provide accurate predictions for both materials.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Engineering, Mechanical
Hao Chen, Fan Yang, Zhen Wu, Bowen Yang, Junzhou Huo
Summary: This paper proposes a nonlinear fatigue damage accumulation model under variable amplitude loading considering the loading sequence effect. The model is validated and compared through experimental data, and it is found that the prediction accuracy of the proposed model is significantly higher than the other two models, while the difficulty of using the proposed model is lower than that of similar models.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Construction & Building Technology
Michele Mirra, Geert Ravenshorst, Peter de Vries, Francesco Messali
Summary: This work presents an experimental study conducted at Delft University of Technology to investigate the characteristics of timber-masonry connections in the context of gas-induced earthquakes in the province of Groningen, Netherlands. The tests were conducted under various loading conditions to analyze the response of the connections in terms of strength, stiffness, and damage evolution. The obtained results provide valuable insights into the properties of existing connections and the effectiveness of retrofitting methods.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Atsushi Kubo, Emi Kawai, Takashi Sumigawa, Hiroyuki Shima, Yoshitaka Umeno
Summary: A series of molecular dynamics simulations were conducted to investigate the fatigue mechanisms in metal nanowires. By applying axial cyclic loading deformation on a copper single-crystal nanowire model, the deformation process during cycle evolution was observed. It was found that the deformation mechanisms in nanowires differ significantly from macro- and micro-scaled materials due to the absence of dislocation sources. Continuous formation of atomic vacancies by dislocation motion, even under a simple single-slip condition, was also identified. The accumulation of vacancies is expected to be a probable mechanism of fatigue in nanomaterials.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Composites
Lei Zhang, Zhao Liu, Di Wu, Hanyu Zhang, Ping Zhu
Summary: To predict the stress versus number of cycles to failure (S-N) curve of short fiber reinforced polymers (SFRP) with any microstructure, a synergetic framework is proposed, incorporating quasi-static damage and cyclic modulus degradation. Well-designed tests reveal an intrinsic relationship between modulus degradation and fatigue life. Microstructure-independent relationships among first cycle damage (FCD), stable relative modulus degradation rate (SRMDR), and fatigue life are deduced and demonstrated. The FCD-based and SRMDR-based approaches generate S-N data in the low-life and high-life regions, respectively, reducing the error by more than 80%.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Composites
Harini Sridharan, Jagannath Chanda, Prasenjit Ghosh, Rabindra Mukhopadhyay
PROGRESS IN RUBBER PLASTICS AND RECYCLING TECHNOLOGY
(2020)
Article
Engineering, Chemical
Soumya Ghosh Chowdhury, Jagannath Chanda, Sreedip Ghosh, Koushik Banerjee, Shib Shankar Banerjee, Amit Das, Prasenjit Ghosh, Sanjay Kr. Bhattacharyya, Rabindra Mukhopadhyay
POLYMER ENGINEERING AND SCIENCE
(2020)
Article
Polymer Science
H. Sushmitha, Jagannath Chanda, Amitabha Saha, Prasenjit Ghosh, Rabindra Mukhopadhyay
Summary: The research focused on developing inner-liner compounds of improved air impermeability by utilizing platelet filler (layered silicate), which resulted in enhanced gas impermeability and improved mechanical properties and filler dispersion.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Soumya Ghosh Chowdhury, Jagannath Chanda, Sreedip Ghosh, Abhijit Pal, Prasenjit Ghosh, Sanjay Kumar Bhattacharyya, Rabindra Mukhopadhyay, Shib Shankar Banerjee, Amit Das
Summary: The study demonstrates that replacing synthetic filler (silica) with alpha-cellulose as filler in E-SBR composite can effectively enhance the reinforcement ability of the composite material. Regarding performance parameters, a loading of 10 phr alpha-cellulose is considered as the optimal dosage.
Article
Green & Sustainable Science & Technology
Sakrit Hait, Debapriya De, Anik Kumar Ghosh, Muhannad Al Aiti, Prasenjit Ghosh, Jagannath Chanda, Rabindra Mukhopadhyay, Saikat Dasgupta, Sven Wiessner, Gert Heinrich, Amit Das
Summary: The research on utilizing waste lignin as a reinforcing constituent in rubber composites has shown superior mechanical performance compared to traditional fillers. By using specific rubber curing ingredients and mixing protocols, the homogeneous dispersion of lignin was achieved, leading to a breakthrough in developing bio-based high-performance rubber composites.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Materials Science, Composites
Sakrit Hait, Debapriya De, Prasenjit Ghosh, Jagannath Chanda, Rabindra Mukhopadhyay, Saikat Dasgupta, Aladdin Sallat, Muhannad Al Aiti, Klaus Werner Stoeckelhuber, Sven Wiessner, Gert Heinrich, Amit Das
Summary: Using renewable resources to produce high-performance elastomer composites is a win-win strategy. Lignin, as a renewable biomass, can be mixed with polybutadiene rubber at elevated temperature to achieve superior mechanical performance, and the efficient dispersion of lignin into the rubber matrix through interfacial interaction enables excellent mechanical properties of the rubber composites.
JOURNAL OF COMPOSITES SCIENCE
(2021)
Article
Engineering, Chemical
Jagannath Chanda, Nitish Mishra, Tuhin Dolui, Prasenjit Ghosh, Rabindra Mukhopadhyay
Summary: In this study, the fatigue crack growth (FCG) behavior of natural rubber compounds filled with different particle sizes and structures of carbon black (CB) was investigated. It was found that compounds with smaller particle size and higher structure CB showed better distribution and dispersion of CB throughout the matrix, resulting in superior fatigue resistance.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Polymer Science
Amit Kumar Sen, Jagannath Chanda, Biswajit Shee, Amrita Mazumder, Mridul Dasgupta, Prasenjit Ghosh, Rabindra Mukhopadhyay
Summary: This study investigates the use of VCR to improve the rolling resistance coefficient (RRc) of tires by reducing the hysteresis of the compound. The results show that the replacement of Syndiotactic polymers in the compound can enhance its modulus, hysteresis, and fatigue crack growth (FCG) properties. AFM analysis confirms the homogeneous dispersion of VCR in the rubber matrix.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Anandarup Bhattacharyya, Nitish Mishra, Tuhin Dolui, Jagannath Chanda, Prasenjit Ghosh, Rabindra Mukhopadhyay
Summary: The crack growth behavior of different filled rubber materials was studied, and it was found that the 80/20 NR-SBR compound exhibited the lowest crack growth rate and the highest viscous energy dissipation, indicating the best fatigue resistance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Chemical
Soumya Ghosh Chowdhury, Sreedip Ghosh, Jagannath Chanda, Prasenjit Ghosh, Sanjay Kumar Bhattacharyya, Rabindra Mukhopadhyay
Summary: This study investigates the fatigue crack growth behavior of lignin-filled composite as a sustainable filler in rubber products, specifically tires. The impact of epoxidation of natural rubber on crack growth behavior is examined, showing that the introduction of epoxy groups leads to changes in tearing energy and a decrease in crack growth rate. The increase in polar interaction among the matrix contributes significantly to the fatigue crack growth rate.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Polymer Science
Arnab Dutta, Jagannath Chanda, Tirthankar Bhandary, Sanjit Kumar Das, Shib Shankar Banerjee, Prasenjit Ghosh, Saikat Das Gupta, Rabindra Mukhopadhyay
Summary: This study prepared functional rubber composites with improved gas barrier performance by incorporating organically modified clay (OMC) and carbon black (CB) as fillers, and bromobutyl rubber (BIIR) and natural rubber (NR) as elastomer phases. The OMC modified composites showed significant improvement in gas barrier properties and superior mechanical properties compared to the control compound.
POLYMER-PLASTICS TECHNOLOGY AND MATERIALS
(2022)
Article
Engineering, Mechanical
Shivam Mangal, Prasenjit Ghosh, K. V. Narasimha Rao, Ravindra Mukhopadhyay
Summary: Tire rolling resistance is crucial for a vehicle's fuel consumption and can be optimized through advanced materials processing, new technologies, and innovative tire design. Effective distribution of the contributor of rolling loss is necessary for achieving optimal rolling resistance, with different deformation states contributing to the loss in varying ways. A novel approach for optimizing tire rolling resistance using a nonlinear finite element method has shown significant improvements in reducing rolling resistance.
TIRE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Prasenjit Ghosh, Rabindra Mukhopadhyay, Krishna Kumar Ramarathnam
Summary: Rubber products are susceptible to cyclic fatigue loading, and materials with better resistance to fatigue crack growth (FCG) are suitable for durable products. The FCG characteristics of rubber compounds are influenced by various factors, including constituent material, environment, and operational conditions. The choice of loading pattern is crucial for simulating realistic service conditions and understanding FCG characteristics.
TIRE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Prasenjit Ghosh, Rabindra Mukhopadhyay, Radek Stocek
KGK-KAUTSCHUK GUMMI KUNSTSTOFFE
(2016)
