Article
Physics, Multidisciplinary
Dunwei Peng, Yunpeng Zhang, Xiaolin Tian, Hua Hou, Yuhong Zhao
Summary: The propagation mechanism of microcracks in nanocrystalline single crystal systems under uniaxial dynamic and static tension was investigated using the phase-field-crystal method. The results showed that different orientation angles can induce different crack propagation modes, morphology, free energy, crack area change, and fracture failure. The crack propagation mode depends on the dislocation activity near the crack tip. This work has practical significance in preventing material fracture failure and improving material performance.
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, Mechanical
Mengze Yang, Houxu Huang, Yu Yang
Summary: This study investigates the damage and fracture of brittle rock under long-term static loading, proposing a new expression for predicting rock durability based on the total time for microcrack propagation, and analyzing the relationship between the durability index and rock type.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Mechanics
Wenqiang Xu, Hanzhang Li, Yu Li, Teng Wang, Shenghua Lu, Sheng Qiang, Xia Hua
Summary: In this paper, a novel adaptive refinement strategy and virtual crack insertion technique for phase-field models are proposed. These techniques have been proven to enhance efficiency in calculation and are applicable for fracture problems, as demonstrated by numerical experiments.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Xu Li, Yue Sheng, Hongda Yang, Xiaoyu Jiang
Summary: This study investigates the propagation behavior of macrocracks and microcracks using Muskhelishvili's complex potential method and the equivalent crack method. The analysis shows that parallel distributed microcracks facilitate the propagation of macrocracks, while the closure effect may delay the propagation process of long cracks.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Subhendu Chakraborty, Somnath Ghosh
Summary: This paper presents a method for enhancing the Helmholtz free energy density functionals in coupled crystal plasticity phase-field finite element models of fracture by considering the influence of atomic-scale, crack-tip nucleated dislocations. The proposed approach is motivated and calibrated by energy equivalence between atomistic-continuum scale models, demonstrating the significant effect of nucleated dislocations on crack evolution.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Mechanics
Pham Hong Cong, Do Van Thom, Doan Hong Duc
Summary: This paper investigates the crack propagation behavior of plane strain micro-plates using the modified couple stress theory and the phase-field theory. A phase-field formulation for fracture mechanics based on the framework of the modified couple stress is established for the first time. The results highlight the difference in mechanical properties during crack propagation when considering size-effect based on modified couple stress. This work is important for scientists studying the fracture development process in microstructures.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Dingding Lu, Ben Lin, Tianle Liu, Sanxi Deng, Youjie Guo, Jinfeng Li, Danyang Liu
Summary: Optimizing heat treatments can lead to desirable grain structure in aluminum alloys, which greatly enhances their mechanical properties. The influence of grain structures on fatigue crack propagation (FCP) behaviors was studied in Al-Cu-Li alloy with hot-rolled (HR) and cold-rolled (CR). Subgrain boundaries have a significant impact on small crack growth rates, while the specific cellular structure within grains improves deformation capacity and leads to lower fatigue crack growth rates in HR specimens. Recrystallization in CR specimens results in small anisotropy in fatigue resistance due to recrystallization texture.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Pietro Pascale, Kumar Vemaganti
Summary: This work investigates the prediction of crack nucleation in the evolution of cracks using the phase field approach. The impact of the Ambrosio-Tortorelli regularized crack formulation on the predictability of crack formation and early propagation is studied. Numerical experiments show that the regularization of the crack introduces systematic errors at the early stages of crack propagation, affecting the predictability of crack nucleation. The nature of the error and its localization with respect to the crack geometry are also analyzed.
INTERNATIONAL JOURNAL OF FRACTURE
(2023)
Review
Mechanics
Peidong Li, Weidong Li, Biao Li, Shuo Yang, Yongxing Shen, Qingyuan Wang, Kun Zhou
Summary: Phase field fracture models have shown great capabilities in simulating crack behavior in materials under external stimuli. They can incorporate various material properties and have been extended to fatigue damage and failures. This paper provides a comprehensive review of recent work on phase field models for fatigue, including the fundamentals of the models, approaches to fatigue damage, crack nucleation and propagation, coupling with cyclic plasticity, and acceleration algorithms. The future research directions and challenges in engineering applications are also discussed.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Liang Yang, Yongtao Yang, Hong Zheng, Zhijun Wu
Summary: The paper proposes an algorithm in which the values of phase field are used to identify crack paths, and physical patches are then cut by reconstructed crack paths to obtain explicit cracks and jump displacement field. The numerical examples demonstrate the predictions of various explicit cracks by the proposed method are in good agreement with literature, and Sneddon's example verifies the discontinuous displacement field across explicit cracks is consistent with the closed form solution. The proposed numerical model warrants further investigation.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mathematics, Interdisciplinary Applications
Stefan Loehnert, Christian Krueger, Verena Klempt, Lukas Munk
Summary: This paper presents an enriched phase-field method for the simulation of 2D fracture processes, which has the potential to greatly reduce computational cost compared to the classical phase-field method. The method combines a phase-field approach with an ansatz transformation and an enrichment technique, allowing for the application of coarser meshes while still obtaining accurate solutions. Unlike classical XFEM / GFEM, this method simplifies the simulation of crack initiation, propagation, and coalescence by not requiring level set techniques or explicit representations of crack geometries.
COMPUTATIONAL MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Reza Khosravani, Shahed Rezaei, Hui Ruan, Tamara Reinicke
Summary: This study investigates the fracture behavior of 3D-printed polymer parts and explores the influence of reinforcement through experimental and numerical analyses. The results can be applied for optimization and further development.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Mechanics
D. Pranavi, A. Rajagopal, J. N. Reddy
Summary: The proposed phase field model considers interfacial damage for different fiber configurations in composite materials, introducing anisotropy and capturing distinct contributions of fibers and matrix in elastic equilibrium. By considering factors such as fiber orientation, interface properties, and laminate configuration, the model captures predominant failure phenomena in composite materials.
COMPOSITE STRUCTURES
(2021)
Article
Energy & Fuels
Bin Xu, Tao Xu, Yanchao Xue, Michael J. Heap, P. G. Ranjith, P. L. P. Wasantha, Zhiguo Li
Summary: Understanding crack growth and interaction in rock is crucial for investigating its mechanical properties at a macroscopic scale. This paper introduces and implements a crack growth model into the phase field method to study crack nucleation, growth, and interaction in rock. The model is validated against experimental results and reveals important findings on crack initiation positions and the influence of rock bridge ligament angle on crack interaction.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Physics, Condensed Matter
A. Jbeli, N. Zeiri, N. Yahyaoui, P. Baser, M. Said
Summary: The electronic and optical properties of CdSe/ZnSe semiconductor core/shell quantum dots with hydrogenic donor impurity were investigated theoretically. The perturbation and variational methods were used to calculate the binding energy, photoionization cross-section, polarizability, and diamagnetic susceptibility of the excited impurity under various conditions. A significant stark shift in the binding energy was observed under the influence of an external electric field.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Rahat Batool, Tariq Mahmood, Sajid Mahmood, Abdul Aziz Bhatti
Summary: This study investigates the effects of alkali metal doping (Na, K, Cs) on MAPbI3 through compositional engineering. The results show that doping Na, K, and Cs can improve the phase stability, thermodynamic stability, and optical absorption of MAPbI3.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
N. A. N. M. Nor, M. A. H. Razali, W. H. A. W. K. Annuar, N. N. Alam, F. N. Sazman, N. H. M. Zaki, A. S. Kamisan, A. I. Kamisan, M. H. Samat, A. M. M. Ali, O. H. Hassan, B. U. Haq, M. Z. A. Yahya, M. F. M. Taib
Summary: This study investigates the potential of quaternary chalcogenides semiconductors as thin film solar cell absorbers using density functional theory (DFT) and density functional theory plus Hubbard U (DFT + U) approach. The results show that by applying Hubbard U terms, the electronic band gaps can be accurately predicted, providing valuable insights for finding cost-effective new thin film solar cell materials.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Ashwani Kumar, Anuj Kumar, Mohaseen S. Tamboli, Mohd Ubaidullah, J. Jayarubi, S. K. Tripathi
Summary: In this study, lead-based perovskite solar cells are replaced by bismuth-based perovskite cells to overcome their instability and toxicity. CsBi3I10 perovskite films are fabricated using a modified drop-casting process, and the effects of post-annealing temperature on the morphological, structural, and optical properties are investigated. The photovoltaic performance of the cells without a hole transport layer is also quantitatively evaluated.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yang Gao, Shu-Ming Chen, Shuo Cao, Shang-Zhou Zhang, Philippe Djemia, Qing-Miao Hu
Summary: This study investigates the phase stability, elastic modulus, and hardness of ternary nitride Ti1-xAlxN. It is found that the hardness increases with the Al content x. The cubic B1 structure is more stable for x < about 0.75, while the hexagonal structure (B4) is more stable for x > about 0.75. The composition dependent hardness and phase decomposition contribute to the convex shaped hardness curve of Ti1-xAlxN.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Fengqi Wang, Qinyan Ye, Xulin He, Kun Luo, Xiaolong Ran, Xingping Zheng, Cheng Liao, Ru Li
Summary: This report uses rigorous calculations based on density functional theory to study the piezoelectric and elastic properties of wurtzite aluminum nitride (w-AlN) with single- and co-alloying by Hf (or Zr) and Sc. The research finds that the (HfSc)0.375Al0.625N and (ZrSc)0.375Al0.625N with stable wurtzite phase have a large piezoelectric coefficient d33 of 49.18 pC/N and 47.00 pC/N, respectively. However, the piezoelectric voltage constant g33 and electromechanical coupling constant k233 of HfAlN, ZrAlN, HfScAlN, and ZrScAlN are smaller than that of ScAlN, which is attributed to the large dielectric constant epsilon 33 of Hf (or Zr) alloying samples. Furthermore, the calculations of internal parameter u and bond angle alpha elucidate the brittle-to-ductile transformation in alloying w-AlN crystal structure. Electronic structure calculations show that the bandgap decreases almost linearly with the increase of alloying concentration, and the Hf (or Zr) alloying compounds become n-type semiconductors due to the existing high-charge states.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
S. R. Athul, K. Arun, S. Swathi, U. D. Remya, Andrea Dzubinska, Marian Reiffers, Nagalakshmi Ramamoorthi
Summary: The magnetic and magnetocaloric characteristics of Ho6FeSb2 have been studied. The compound exhibits two second-order ferromagnetic transitions, enabling hysteresis-free magnetocaloric effect across a wide temperature range. The alloy has high relative cooling power and magnetoresistance, making it suitable for hysteresis-free magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Reena Sharma, Neelam Hooda, Ashima Hooda, Satish Khasa
Summary: A polycrystalline double perovskite La2CoMnO6 sample was prepared and its structural, dielectric and magnetic properties were investigated. The sample exhibited complex structures and magnetic behavior, and showed good conductivity and dielectric performance. Its multi-domain magnetic structure suggests its suitability for memory device applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Shubha Dubey, Jisha A. Abraham, Kumud Dubey, Vineet Sahu, Anchit Modi, G. Pagare, N. K. Gaur
Summary: This study investigates the optoelectronic, thermodynamic, thermoelectric, and mechanical stability properties of RhTiP Half Heusler semiconductors. The results show that RhTiP is a non-magnetic material with confirmed mechanical stability. It is found to be an indirect-bandgap semiconductor with a good Seebeck coefficient. This study suggests that RhTiP has promising applications in the thermoelectric and optoelectronic fields.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Xun Xie, Jiong-Ju Hao, Hong-Wei Yang
Summary: This work presents a multilayer film structure that uses optical resonance to prepare highly efficient and saturated red, green, and blue transmittance colors. Numerical simulations and analysis show that the structure can produce R, G, and B colors with a purity comparable to standard RGB colors, while maintaining efficient transmission efficiency and obtaining a rich variety of structural colors. Additionally, a metallic interlayer is introduced to selectively suppress resonances in the short-wavelength region, improving the purity of the red color. The study also investigates the effect of the incidence angle on color purity and transmission efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yueqiang Zhao
Summary: Solubility property is of great interest in chemical, physical, pharmaceutical, material, and environmental sciences. Understanding the intrinsic reason behind solubility behavior is a fascinating task. The theoretical relation between binary mutual solubility and liquid-liquid interfacial tension has been derived, where the partitioning of solute molecules between two coexisting liquid phases is determined by the transfer free energy per unit segment for a chain-like solute molecule expressed in terms of solute-solvent interfacial tension. This general theory of solubility is in good agreement with experimental results for binary mutual solubility and molar transfer free energy of solute molecules.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Osama K. M. Bashiar, R. E. Kroon, H. C. Swart, R. A. Harris
Summary: ZnO thin films with near-infrared emission were successfully fabricated using pulsed laser deposition under vacuum conditions, without the need for additional gases or implantation methods. The NIR emission was hypothesized to be caused by defects in the ZnO film due to high energy particle impacts on the sample surface.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
O. Stognei, A. Berezutskii, I. Anisimov, A. Deryabin
Summary: The influence of ZrOn matrix stoichiometry on the electrical and magnetoresistive properties of Fe-Zr-O nanocomposites has been studied. It was found that the magnetoresistive effect is not observed in composites with oxygen lack, while composites with oxygen excess show magnetoresistive effect and increased resistivity. Magnetoresistivity in composites with oxygen lack only appears after heat treatment. These results can be explained by the difference in the density of localized states in the oxide matrix of the composites and the ratio between two types of conductivity.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Mehmet Bayirli, Aykut Ilgaz, Orhan Zeybek
Summary: The present study aims to understand the relationship between impedance characteristics and fractal behaviors. By producing neat and carbon nanotube doped composite specimens, the researchers investigated the electrical properties and surface heteromorphology using Nyquist plots and fractal analysis.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
M. I. Khan, Saddam Hussain, Muhamad Saleem, Fatimah Mohammed Alzahrani, Muhammad Siddique, M. S. Hassan, Allah Ditta Khalid, Munawar Iqbal
Summary: The sol-gel method was used to deposit Ti-doped MAPbBr3 films on FTO-glass substrates with different doping ratios (0%, 4%, and 6%). XRD analysis confirmed the cubic structure of all films, and the 4% Ti-doped film exhibited a large grain size, low band gap energy, and high refractive index. Solar cells fabricated using the 4% Ti-doped MAPbBr3 film showed improved performance in terms of current density, open circuit voltage, fill factor, and efficiency.
PHYSICA B-CONDENSED MATTER
(2024)