Article
Engineering, Mechanical
Mehmet N. Balci, Serkan Dag, Bora Yildirim
Summary: This work investigates the thermal contact problem of a rigid flat punch sliding over a functionally graded material coating with a surface crack. The study models the thermoelastic contact and surface crack problems using finite element method and develops an iterative solution procedure to compute the stress intensity factors under thermomechanical loading.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Chemistry, Physical
Sandeep Kumar Paul, Parth Dinesh Mehta, Manoj Sahni, Ernesto Leon-Castro
Summary: In this study, the steady-state elastic stresses of a thick hollow axisymmetric functionally graded cylinder are investigated using an iteration technique and the finite element method. The effects of material property variation and in-homogeneity on displacement and stresses are analyzed. The iterative method is found to be efficient in obtaining accurate solutions, and the results obtained from the iterative method and the finite element method are in good agreement.
Article
Mechanics
Long-Fei Wang, Xiao-Ping Zhou
Summary: The FE-FEM method simulates stress intensity factors (SIFs) and crack propagation paths in FGMs by using a fracture criterion and enriched field variables on nodes, avoiding the need for remeshing, level set function, and enrichment function. The method provides a simple and effective way to calibrate SIFs and simulate crack propagation in FGMs.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Esayas L. Sh, Subhaschandra Kattimani, Nguyen Thoi Trung
Summary: This paper investigates the frequency response of edge-cracked magneto-electro elastic functionally graded plates using the extended finite element method. By developing a numerical model and analyzing the coupled equations, the study explores the influence of material gradation and crack parameters on the frequency response, and examines the behavior of crack propagation. The results have important implications for the design of functionally graded magneto electro elastic structures and devices.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
Ahmed Raza, Himanshu Pathak, Mohammad Talha
Summary: This paper investigates the influence of microstructural defects on the vibration characteristics of cracked functionally graded plates using extended finite element formulation and level set function. The effects of different parameters on the natural frequencies are discussed, and the accuracy and efficiency of the computational approach are verified.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Materials Science, Multidisciplinary
Huu-Dien Nguyen, Shyh-Chour Huang
Summary: This research introduces the application of MATLAB codes and the extended finite element method based on the level-set method to simulate the stress concentration factor at circular holes near the material boundary. By comparing with analytical results, significant errors of the extended finite element method compared to the exact and experimental methods were found.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
P. Das, M. A. Islam, S. Somadder, M. A. Hasib
Summary: This study investigates the thermo-mechanical behavior of FGM hollow cylinders under mechanical loading and thermal stresses. The results indicate that the properties of the cylinder can be altered by changing the non-dimensional parameter beta, and the effect of various boundary conditions on stress fields is significant, with thermal boundary conditions having a more dominant influence.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Mechanics
Kushan Prasad Verma, Dipak Kumar Maiti
Summary: This study investigates the mechanical and thermal response of ceramic-metal composite functionally graded cylindrical and spherical shells under rapidly applied mechanical and thermal loads on their inner surface. Mori-Tanaka model and numerical analysis methods are employed, and the results show that the shell response tends towards quasi-static after removal of the mechanical load.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Shyam Kumar Chaudhary, Vishesh Ranjan Kar, Karunesh Kumar Shukla
Summary: This study examines the flexural behavior of functionally graded composite panels with single and multiple rectangular perforations under complex loading conditions, and presents new numerical examples to demonstrate the effects of various parameters on the deflection responses. The model is validated using mesh convergence tests and comparisons with benchmark solutions.
JOURNAL OF AEROSPACE ENGINEERING
(2021)
Article
Mechanics
Jose S. Moita, Aurelio L. Araujo, Victor Franco Correia, Cristovao M. Mota Soares
Summary: The buckling analysis of functionally graded materials (FGM) axisymmetric plate-shell type structures under mechanical and thermal loading is presented in this work utilizing numerical solution and finite element model. The use of penalty function to handle transverse shear deformations and achieve analysis with traditional shear deformation allows for reduced computational time.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Thom Van Do, Duc Hong Doan, Nguyen Chi Tho, Nguyen Dinh Duc
Summary: This study investigates the thermal buckling of fractured functionally graded material plates using a phase-field model, demonstrating the difference in static stability response based on temperature-dependent and temperature-independent material mechanical properties. The research provides valuable information for scientists to choose the most accurate computation model.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Engineering, Mechanical
M. D. Iqbal, C. Birk, E. T. Ooi, S. Natarajan, H. Gravenkamp
Summary: This paper extends the scaled boundary finite element method (SBFEM) to model fracture in functionally graded materials (FGMs) and examines the effects of fully coupled transient thermoelasticity. It utilizes the previously developed SBFEM supplementary shape functions to model thermal stresses and approximates the spatial variation of thermal and mechanical properties of FGMs by polynomial functions. The dynamic stress intensity factors (SIFs) are evaluated semi-analytically from their definitions without the need for additional post-processing. This approach is validated through numerical examples and comparison with reference solutions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Lenin Babu Mailan Chinnapandi, Jeyaraj Pitchaimani, Mohamed A. Eltaher
Summary: This manuscript presents a comprehensive model to study the vibro-acoustic behavior of functionally graded beams under thermal and mechanical loads, taking into account the effect of porosity. The numerical analysis and parametric studies reveal that the nature of porosity affects the sound radiation behavior.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Andrzej Teter, Zbigniew Kolakowski
Summary: This study investigates the multimodal buckling phenomenon of wide stiffened plates made of Functionally Graded Materials (FGM) under uniform compression. It is found that the stiffness of the stiffeners significantly affects the ultimate load-carrying capacity of the structure when the eigenvalues of the global mode and the lowest local mode are comparable.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Quansheng Zang, Jun Liu, Wenbin Ye, Fan Yang, Congkuan Hao, Gao Lin
Summary: A novel plate formulation based on the isogeometric analysis and scaled boundary element method is proposed for solving static bending and free vibration problems of functionally graded material (FGM) plates. The proposed method reduces the problem dimension, accurately predicts stress distribution, and is applicable to FGM plates with complex geometries.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Physical
Alfredo Zafra, Zachary Harris, Evzen Korec, Emilio Martinez-Paneda
Summary: This study investigates the relative efficacy of electrochemical permeation (EP) and isothermal desorption spectroscopy (ITDS) methods in determining hydrogen diffusivity using cold-rolled pure iron. The diffusivities obtained from EP experiments are compared to ITDS results. The results show that the second EP transient and ITDS have similar average diffusivity, which is significantly higher than the first EP transient. However, the ITDS experiments have a reduced coefficient of variation, indicating improved repeatability compared to the EP transients.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Mechanical
Alireza Golahmar, Christian F. Niordson, Emilio Martinez-Paneda
Summary: We propose a generalized phase field formulation for predicting high-cycle fatigue in metals. The formulation includes different fatigue degradation functions and new damage accumulation strategies to account for various factors. The numerical implementation uses an efficient quasi-Newton monolithic solution strategy and yields accurate predictions compared to experimental results.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Multidisciplinary
J. C. Garcia-Merino, C. Calvo-Jurado, E. Martinez-Paneda, E. Garcia-Macias
Summary: This paper proposes a surrogate modelling technique based on domain partitioning for Bayesian parameter inference of highly nonlinear engineering models. The proposed technique utilizes a multielement Polynomial Chaos Expansion based Kriging metamodel to alleviate the computational burden. The efficiency and accuracy of the approach are validated through two case studies.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Electrochemistry
Tim Hageman, Emilio Martinez-Paneda
Summary: Computational modelling of metal-electrolyte reactions is crucial but challenging due to numerical oscillations caused by dissimilar reaction rates. In this work, a lumped integration scheme that overcomes these oscillations is presented, allowing for larger time increments and simulations over longer time scales. The scheme is demonstrated by simulating hydrogen ingress, enabling predictions over years and practical applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
A. Zafra, G. Alvarez, G. Benoit, G. Henaff, E. Martinez-Paneda, C. Rodriguez, J. Belzunce
Summary: We investigated the effects of conducting hydrogen-assisted fatigue crack growth experiments in different environments on welded 42CrMo4 steel. The results showed significant differences between testing approaches and weld regions. Microscopy analysis and finite element modelling were used to explain these differences. Both testing approaches revealed higher susceptibility to hydrogen embrittlement in the heat affected zone, with similar microstructural behavior observed in both regions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
John A. Lewis, Stephanie E. Sandoval, Yuhgene Liu, Douglas Lars Nelson, Sun Geun Yoon, Runzi Wang, Ying Zhao, Mengkun Tian, Pavel Shevchenko, Emilio Martinez-Paneda, Matthew T. McDowell
Summary: Anode-free solid-state batteries demonstrate high energy density, and commercially relevant quantities of lithium can be plated reliably at moderate current densities using a sulfide solid-state electrolyte. The cycling stability of these batteries is limited by the nonuniform presence of lithium during stripping, leading to high local current densities and void formation. However, thicker lithium at the interface can improve resistance to short circuiting.
ADVANCED ENERGY MATERIALS
(2023)
Article
Engineering, Biomedical
Sasa Kovacevic, Wahaaj Ali, Emilio Martinez-Paneda, Javier LLorca
Summary: A phase-field model is developed to simulate the corrosion of Mg alloys in body fluids, capturing both uniform and pitting corrosion. The model takes into account the synergistic effect of aggressive environments and mechanical loading in accelerating corrosion kinetics. It has the potential to assess the service life and optimize the design of Mg-based biomedical devices, promoting the development of Mg alloys as biodegradable implant materials.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Multidisciplinary
Tim Hageman, Emilio Martinez-Paneda
Summary: We propose a new theoretical and computational framework for modeling electro-chemo-mechanical fracture. The model combines phase field description of fracture with a fully coupled characterization of electrolyte behavior, surface chemical reactions, and stress-assisted diffusion. Unlike other existing methods, our approach accurately captures the results obtained with discrete fracture simulations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Construction & Building Technology
Evzen Korec, Milan Jirasek, Hong S. Wong, Emilio Martinez-Paneda
Summary: We propose a new mechanistic framework that addresses corrosion-induced cracking in reinforced concrete by understanding the underlying chemo-mechanical processes. This framework combines various models, including reactive transport and precipitation of dissolved Fe2+ and Fe3+ ions, precipitation eigenstrain model, phase-field model for concrete fracture behavior, and damage-dependent diffusivity tensor. Finite element model predictions align well with experimental data from impressed current tests.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Electrochemistry
Tim Hageman, Carmen Andrade, Emilio Martinez-Paneda
Summary: In this study, a new computational model is proposed to predict corrosion under charge-conservation conditions. The model captures the change in metal potential, reflecting the rates of corrosion and cathodic reactions in natural conditions. Finite element simulations reveal the significant influence of the charge-conservation assumption on corrosion rates and quantify them under realistic conditions. The results further show the strong coupling between corrosion rate and hydrogen/oxygen evolution reactions, the acidification of corrosion pits, and the sustainability of corrosion in the absence of oxygen.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Mechanical
S. Lucarini, F. P. E. Dunne, E. Martinez-Paneda
Summary: A novel FFT-based phase-field fracture framework is proposed for modeling fatigue crack initiation and propagation at the microscale. The damage driving force is defined based on stored energy and dislocation density, linking phase-field fracture to microstructural fatigue damage. The formulation is numerically implemented using FFT methods allowing for modeling of large 3D microstructural regions. The simulation predicts crack paths, growth rates, and sensitivity to microstructural features.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Environmental
Alain Islas, Andres Rodriguez Fernandez, Covadonga Betegon, Emilio Martinez-Paneda, Adrian Panda
Summary: This study presents CFD simulations of biomass dust explosions using a newly developed experimental apparatus, and validates the CFD model's capability to capture transient effects. The results show excellent agreement between the model and experiments, highlighting the critical role of particle size in flame dynamics and the explosion itself. This model has great potential for future investigations of biomass dust explosions in larger-scale geometries.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Manufacturing
G. Alvarez, Z. Harris, K. Wada, C. Rodriguez, E. Martinez-Paneda
Summary: This article evaluates the influence of post-build processing on the hydrogen embrittlement behavior of additively manufactured (AM) 316L stainless steel. The results show that AM 316L exhibits lower ductility at room temperature, but comparable ductility to conventionally manufactured (CM) 316L at -50 degrees C. After hydrogen charging, the ductility of AM 316L is similar to or even better than CM 316L. Feritscope measurements indicate that this improved performance is related to the reduced propensity for AM 316L to form strain-induced martensite.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Mechanical
Charalampos Konstantinou, Emilio Martinez-Paneda, Giovanna Biscontin, Norman A. Fleck
Summary: In this study, microbiologically-induced calcium carbonate precipitation (MICP) was used to manufacture laboratory-scale specimens for fracture toughness measurement. The dependencies of mode I and mixed-mode fracture toughness on cementation, as well as their correlations with strength, permeability, and porosity, were investigated. A micromechanical model was developed to predict the relationship between mode I fracture toughness and the degree of cementation. The role of crack tip T-stress in determining kink angle and toughness under mixed mode loading was also determined.
EXTREME MECHANICS LETTERS
(2023)
Article
Chemistry, Physical
Huw C. W. Parks, Adam M. Boyce, Aaron Wade, Thomas M. M. Heenan, Chun Tan, Emilio Martinez-Paneda, Paul R. Shearing, Dan J. L. Brett, Rhodri Jervis
Summary: Understanding the characteristics of crack generation, formation, and propagation is crucial for understanding the degradation modes that lead to decline in battery performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
