Article
Environmental Sciences
Dexin Li, Chengchao Guo, Heng Liang, Xinpo Sun, Liqun Ma, Xueliang Zhu
Summary: This study analyzed the risk of landslides blocking rivers using static analysis and dynamic simulation. The research found that under high-intensity rainfall conditions, the instability volume and sliding surface depth of the landslide were significantly larger compared to ordinary rainfall conditions.
Article
Mechanics
Xuan Zhang, Bingqiang Ji, Xin Liu, Siyu Ding, Xiaomin Wu, Jingchun Min
Summary: This study investigates the impact behaviors of ellipsoidal water droplets on solid surfaces, finding that both the maximum spreading time and factor increase with the increasing aspect ratio. The theoretical analysis suggests that reducing the aspect ratio enhances the viscous dissipation during impact. The modified theoretical model reduces deviations from -23% to -51% to -5% to -25% and elucidates the scaling law between the maximum spreading factor and aspect ratio.
Article
Engineering, Mechanical
Pu Huang, Yunxiang Yin, Daniel McNaulty, Wenyi Yan
Summary: A framework based on the damage tolerance concept was proposed to investigate fatigue cracking in heavy truck trailers and improve fatigue resistance through local geometric modifications. The approach was shown to be effective in monitoring structural integrity and designing trailers with longer life and lighter weight.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Operations Research & Management Science
Dmitry Ivanov
Summary: This study uses simulation analysis to examine the impacts of blackouts on supply chains, considering SC performance, resilience, and viability. The results reveal that blackouts are a special case of SC risks characterized by simultaneous shutdown of processes, disruption propagations, and the danger of viability losses. Simulation experiments show that factors such as power loss propagation, blackout duration, unavailability of supply and logistics, and unpredictable customer behavior determine the blackout impact and recovery strategies. The findings can aid decision-makers in predicting the operational and long-term impacts of blackouts on SCs and developing mitigation and recovery strategies.
ANNALS OF OPERATIONS RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Zhou Zhao, Xing Chen, Jiangbo Wei, Jianquan Ma, Wanjun Ye
Summary: The dynamic process and impact damage of landslides were predicted using a discrete element method in this study, taking the Fenghuang Street landslide in Shaanxi Province, China as an example. The simulation showed that the rear edge of the landslide deformed and failed first, while the leading edge was gradually pushed out, indicating a typical push landslide. The findings can provide reference for risk assessment and vulnerability quantification of brick-concrete buildings in similar landslides.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Mechanical
Y. F. Xu, G. L. Huang
Summary: This study provides an in-depth analysis of the impact of damage on the structural dynamic properties of finite acoustic metamaterials (AMMs). A modal sensitivity analysis is formulated to measure the modal deformation of each spring, and the effects of damage on AMMs are extensively investigated numerically. The results show significant changes in frequency response functions, eigenvalues, and mode shapes of damaged AMMs near bandgaps, with these changes diminishing as frequencies move away from the bandgaps. This research enhances our understanding of the structural dynamics of damaged metamaterials and offers valuable insights for the development of effective damage identification techniques and resilient metamaterial-based structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Shunyu Yao, Yu Lei, Dingzhu Liu, Deqiang Cheng
Summary: The Jinsha River basin in China is at risk of large-scale landslides and flood hazards. This study simulates the dynamic processes associated with landslides and the formation of landslide dams, as well as the resulting outburst floods. The findings indicate the potential height of the dam and the peak flow rate of the flood, as well as the impacted area downstream.
Article
Biochemistry & Molecular Biology
Arittra Bhattacharjee, S. M. Al Muied Pranto, Ishtiaque Ahammad, Zeshan Mahmud Chowdhury, Farha Matin Juliana, Keshob Chandra Das, Chaman Ara Keya, Md Salimullah
Summary: In this study, harmful nsSNPs of the IRS1 gene were identified and their structural and functional consequences were predicted. Three most deleterious SNPs were identified and further insights were gained through molecular dynamics simulation. These findings provide understanding of disease susceptibility, cancer progression, and therapeutic development against IRS1 gene mutants.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Environmental Sciences
Vasudevan Saranya, Ramasamy Shankar, Mansour K. Gatasheh, Sadaf Zehra
Summary: The abnormal self-assembly of the amyloid-beta (A beta) peptide is a major cause of Alzheimer's disease. Gold nanoparticles (AuNPs) have been found to inhibit A beta aggregation, but the effects are still not completely understood. Molecular dynamics simulations show that Au144MC can increase the rigidity of the A beta 42 peptide backbone region, enhancing the structural stability of the peptide and its complex with Au144MC through various interactions.
ENVIRONMENTAL RESEARCH
(2022)
Article
Physics, Fluids & Plasmas
Hanyi Liu, Jun Zhang, Jia Luo, Dongsheng Wen
Summary: Molecular dynamics simulations were used to investigate the behavior of nanodroplets impacting on superhydrophobic and nanocone-structured surfaces. A model was developed to predict whether the nanodroplets would touch the underlying substrate during impact. The advantages and disadvantages of applying nanocone structures to solid surfaces were revealed by analyzing the restitution coefficient and contact time.
Article
Engineering, Manufacturing
Sandeep Olhan, Sameer Kumar Behera, Vikas Khatkar, B. K. Behera
Summary: This study investigates the effect of different machinability processes and fibre architectures on the behavior, strength, and failure mechanism of textile fibre reinforced structural composites (TFRSC) suitable for automotive applications. Basalt fibre reinforced composites exhibited the highest bearing strength, and a mechanics-based approach using finite element modeling was successfully used to predict the bearing response of the composites.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Review
Green & Sustainable Science & Technology
Olga Petrucci
Summary: This review article explores the dynamics of landslide accidents and the characteristics of victims, revealing the worldwide underestimation of landslide fatalities and identifying the importance of multidisciplinary research in this field. It highlights the need for further research on the relationship between landslides and socioeconomic indicators, the dynamics of landslide accidents, and the causes of death or injury.
Article
Engineering, Civil
Alexandre Paris, Philippe Heinrich, Stephane Abadie
Summary: Two simulation approaches for tsunamis generated by granular landslides are proposed and validated, showing that the maximum wave height is related to the initial position of the landslide, slope angle, and landslide Reynolds number. The depth-averaged model and Navier-Stokes model have overlapping optimal viscosity ranges, but produce different relationships between wave height and parameters.
COASTAL ENGINEERING
(2021)
Article
Biochemistry & Molecular Biology
Rajalakshmi Kumar, Manikandan Jayaraman, Krishna Ramadas, Adithan Chandrasekaran
Summary: This study used computational methods to identify and analyze deleterious mutations in the human POR gene associated with diseases. The results showed that the A287P and R457H mutations alter the structure and function of POR, leading to hormone production disorders. The findings from these computational analyses are important for predicting potential harmful mutations, understanding the pathological basis of diseases, and explaining the molecular mechanism of drug metabolism.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Engineering, Marine
Bin Liu, R. Villavicencio, P. Terndrup Pedersen, C. Guedes Soares
Summary: A conceptual design framework is proposed for evaluating the crashworthiness of double-hull structures by simplifying input parameters. Four typical collision and grounding scenarios are considered, analysing ship structural damage and energy absorption under accidental loadings.
Article
Engineering, Civil
Wei Wang, Shengyao Mei, Yajun Cao, Rubin Wang, Qizhi Zhu
Summary: Chemical corrosion significantly degrades the mechanical properties of non-persistently jointed rocks. In order to improve their physical and mechanical properties, a modification test was conducted using silicone immersion and resin filling in the pre-existing joints after chemical corrosion. Triaxial compression tests confirmed that the modification greatly enhanced the peak strength, elastic modulus, and deformation modulus of jointed rocks. SEM and EDS analysis revealed the mechanism behind the strength improvement induced by the modification.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
J. Zhang, J. F. Shao, Q. Z. Zhu, G. De Saxce
Summary: This paper presents a new method for formulating macroscopic strength criteria under cyclic loading of ductile porous media, utilizing the bipotential theory for transformation of Generalized Standard Materials (GSM) to Implicit Standard Materials (ISM). The establishment of a macroscopic fatigue criterion allows for separation of the effects of frictional and dilatancy angles, while also revealing the relationship between the shakedown limit load under hydrostatic loading and the dilatancy angle. The new criterion is validated through comparison with FEM-based simulations and shows improved accuracy compared to previous works based on Melan's static theorem.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Geological
Qiao-Juan Yu, Qi-Zhi Zhu, Liang Chen, Jian-Fu Shao
Summary: This article investigates the mechanical behaviors of Beishan granite, the host rock for China's high-level radioactive waste disposal program, through experimental and numerical methods. The results demonstrate the rock's typical brittle behavior, with peak strength influenced by confining pressure, and its creep behavior extensively dependent on deviatoric stress. A micromechanical friction-damage coupling model is proposed for constitutive modeling, showing its suitability for Beishan granite. The results obtained from tests are analytically simulated, and creep damage is treated within the damage-friction coupling framework. Semi-analytical simulations of creep tests exhibit satisfactory agreement.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Mechanical
Xunjian Hu, Xiaonan Gong, Ni Xie, Qizhi Zhu, Panpan Guo, Haibo Hu, Junjie Ma
Summary: This study presents an extended grain-based phase field method (GB-PFM) based on Voronoi tessellation technology to investigate the mechanical properties and crack propagation in brittle rocks. The results show that greater grain boundaries thickness leads to lower tensile strength and lower Young's modulus, as well as more intergrain cracks. Moreover, GB-PFM provides an applicable numerical method for efficiently reproducing the microstructure and crack propagation of brittle crystalline rocks.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Geological
Qi-Zhi Zhu, Qiao-Juan Yu
Summary: This technical note presents analytical studies on the critical condition that separates class-I and class-II behaviors of brittle rocks. The results show that class-II behavior occurs when the rock is brittle enough, and the triggering condition can be characterized by the critical damage at failure. The study also provides an energetic explanation for the mechanism behind nonlinear dissipative phenomena.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Engineering, Civil
Wei Wang, Xuelei Duan, Yun Jia, Hanbing Bian, Liang Chen, Qizhi Zhu, Yajun Cao
Summary: This study investigates the crack development and damage evolution of sandstone under different seepage conditions. The experimental results show that the crack stress thresholds and mechanical properties of sandstone decrease with increasing water pressure. Additionally, water pressure has a significant influence on the deformation behavior of sandstone.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Environmental
Wei Wang, Xuelei Duan, Yun Jia, Yajun Cao, Qizhi Zhu, Shifan Liu
Summary: This study investigates the deformation behavior and permeability evolution of the host rock mass in underground disposal, with a focus on the influence of loading and unloading cycles. The results demonstrate that cyclic loading and unloading can induce the propagation and compaction of micro-cracks in the sandstone specimens, which in turn affect the mechanical properties and permeability of the rock.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Computer Science, Interdisciplinary Applications
Yudong Chen, Qiaojuan Yu, Qizhi Zhu
Summary: The geomechanical behaviors of gray sandstones under dry and fully saturated conditions were investigated through experimental and numerical studies. The presence of pore water contributed to the reduction of both peak strength and elastic modulus. A new micromechanical damage-friction coupling constitutive model was proposed to capture the incomplete attenuation features of stress relaxation behavior of gray sandstones.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Construction & Building Technology
Shu Zhu, Jinhai Zheng, Zhende Zhu, Qizhi Zhu, Luming Zhou
Summary: The dynamic evolution mechanism of intrinsic crack propagation in rocks is a challenging problem in rock mechanics and engineering. The effect of osmotic pressure on crack propagation has been a puzzling question. Through experiments with transparent specimens, it was found that osmotic pressure accelerated crack growth and inhibited the growth of certain cracks, while lateral pressure suppressed vertical crack propagation.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
L. L. Shi, J. Zhang, Q. Z. Zhu, H. H. Sun
Summary: A deep learning method based on LSTM is proposed in this study to predict the deformation of rock materials under different loading conditions. Unlike traditional methods, this approach does not require the determination of effective tangent stiffness tensor and can accurately predict the mechanical behavior of rock materials with strong strain-softening.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Civil
Hai-Ling Shi, Lun-Yang Zhao, Qi-Zhi Zhu
Summary: In this article, a series of conventional triaxial compression tests were performed to investigate the strength characteristics and deformation behavior of red sandstone. The experimental results show that the red sandstone exhibits increased initial yield stress, volume dilatation stress, and peak strength as the confining pressure increases. Moreover, the failure modes of the specimens change from splitting failure to compressive-shear failure with increasing confining pressure. The non-linear Hoek-Brown criterion is found to be suitable for fitting the strength data. An elastoplastic damage model with a unified plastic hardening/softening law is developed based on the experiments. As a contribution, analytical solutions to the constitutive equations are derived for the conventional triaxial loading path under consideration. The model is validated by comparing the analytical predictions with the experimental data.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Yue Xu, Tao You, Qizhi Zhu
Summary: In this work, an optimized ridge regression algorithm is proposed to capture crack curves or surfaces from two-dimensional or three-dimensional phase-field point cloud. The normal direction of each segment on the identified discrete crack path is estimated using k-nearest neighbor and principal component analysis. The sensitivity and computational efficiency of this method are thoroughly investigated, and it is extended to reconstruct complex discrete fracture networks. Several benchmarks are presented to demonstrate the strength of this approach.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
W. Y. Liu, Q. Z. Zhu, J. Zhang, M. Song, H. H. Sun
Summary: This paper presents a novel micromechanics-based damage constitutive model for describing the mechanical behavior of quasi-brittle rocks under cyclic loading with consideration of confining pressure. The proposed model successfully simulates cyclic loading tests under various confining pressures and upper limit stresses and captures all significant behavior features.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Mechanical
Lun-Yang Zhao, Lu Ren, Fu-Jun Niu, Yuan-Ming Lai, Qi-Zhi Zhu, Jian-Fu Shao
Summary: This study developed an original multi-scale damage approach to estimate the macroscopic anisotropic elastic properties and failure strength of layered rocks (LR). By considering the material structure at both the macroscopic laboratory scale and the microscopic scale, the effective elastic properties of LR were determined using a two-step homogenization technique. A multi-scale friction-damage model (MFDM) was then developed to derive an analytical macroscopic strength criterion. The derived criterion qualitatively predicts the anisotropic failure strength of LR for different orientations of weakness planes, but an improved strength criterion is introduced to quantitatively capture the failure property of LR by considering the interaction between weakness planes and microcracks.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Computer Science, Interdisciplinary Applications
Wen Wang, Qi-Zhi Zhu, Jin Zhang, Tao Ni, Stephane P. A. Bordas
Summary: This study investigates the step-path failure of rock slopes using peridynamic theory. An extended bond-based peridynamic model is introduced to distinguish between different fracture phenomena. The fracture processes of gypsum specimens are simulated, and the feasibility of the model is verified by comparing with experiments. The progressive failure of rock slopes is analyzed at the field scale, capturing crack initiation, propagation, coalescence, and structural damage. The predicted crack propagation and coalescence types contribute to understanding step-path failure mechanisms.
COMPUTERS AND GEOTECHNICS
(2024)