Article
Construction & Building Technology
Qiang Li, Zhixiang Chen
Summary: In this paper, a three-dimensional finite element method was used to analyze typical asphalt pavement structures under FWD test. A dynamic deflection calculation model and method were established, and an equivalent conversion method of asphalt pavement was proposed. The applicability of the method was verified through comparison with on-site FWD results. The proposed method for calculating dynamic deflection is crucial for asphalt pavement construction quality acceptance, modulus back calculation, and pavement design.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mechanics
Rahul Kumar, Achchhe Lal, B. M. Sutaria
Summary: This paper presents the static and dynamic response analysis of sandwich plates with a corrugated core under patch loading. Using a finite element-based higher shear deformation theory, the influence of various parameters on transverse deflection, stresses, and dynamic bending responses is investigated. A MATLAB program is developed and verified with available results in the literature. The study reveals that transverse deflection increases with an increase in corrugation angle, and maximum rotation around the 'x' and y-axis increases with the area of plates exposed to patch loading. Edge constraints significantly affect transverse deflection and stress.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Chemistry, Analytical
Ryan A. Hanson, Cory N. Newton, Aaron Jake Merrell, Anton E. Bowden, Matthew K. Seeley, Ulrike H. Mitchell, Brian A. Mazzeo, David T. Fullwood
Summary: This paper provides a detailed characterization of the voltage response vs frequency of deformation for polymeric foams embedded with nano-scale conductive particles. It also identifies a new sensing functionality, piezoresistive response, which greatly enhances the potential applications for the foam material.
Article
Engineering, Civil
Abdullah Cheraghi, Amir K. Ghorbani-Tanha
Summary: This paper presents the conceptual design and assessment of a new type of driven pile called expanding pile, which is used for designing pile foundations subjected to uplift forces such as buildings, oil platforms, and anchors. Static analyses and finite element method are used to evaluate the axial bearing capacity and seismic behavior of the innovative pile. Results show that the expanding arms provide an ideal anchorage system, increasing the uplift bearing capacity due to the soil's locking-up effect.
GEOMECHANICS AND ENGINEERING
(2023)
Article
Engineering, Geological
Junwen Zhang, Wenbing Fan, Yang Yang, Yang Zhang, Xukai Dong, Yulong Xing, Weigang Zeng, Kailun Fang
Summary: Impact disturbance and bedding angle significantly affect the mechanical response of sandstone under prestressed loading. A combined 1D static and dynamic loading test system is employed to investigate the compression behavior of sandstone at different bedding angles. The results show that strain rebound easily occurs in high-strength sandstone under low impact pressure, and the peak strength of sandstone is positively correlated with the impact pressure. Additionally, the impact pressure influences the crack growth rate of sandstone.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Leta Meko, Yadeta C. Chemeda, Bikila Meko
Summary: Slope instability is a dangerous disaster that often occurs on roads with hilly and mountainous terrains. This study used finite element method and limit equilibrium method to analyze slope stability. The results showed that soil critical slope sections are unstable in wet conditions, while rock-critical slope sections are stable in both dry and wet conditions.
Article
Engineering, Mechanical
Ningkang Meng, Jianbiao Bai, Yong Chen, Xiangyu Wang, Wenda Wu, Bowen Wu
Summary: The study investigates fracture propagation and distribution in the roadside backfill body under combined static and dynamic loadings, as well as the influence of roof cutting angles. Static loading is found to have a greater impact on RBB failure compared to dynamic loading, with a 70-degree roof cutting angle minimizing the effect of dynamic loading. The optimal support measure proposed is roof cutting + roof support above RBBs + RBB reinforcement.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Geological
Chunyong Jiang, Xuanming Ding, Huaqiang Fang, Jing Lian
Summary: Research has found that coral silt, a type of coral soil with over 50% silt content, is formed during land reclamation. The cyclic dynamic shear characteristics of coral silt are important for determining the seismic safety of reef infrastructures due to the frequent action of waves, wind, earthquakes, and other dynamic loads. Symmetrical and asymmetrical cyclic simple shear tests were conducted to investigate the cyclic behavior of coral silt, with emphasis on the static-cyclic shear stress coupling. Empirical formulas were proposed to estimate the undrained peak shear strength and critical state strength in monotonic simple shear tests. The CSR threshold value, ranging from 0.05 to 0.075, controlled the final failure in both symmetrical and asymmetrical-loading cyclic simple shear tests. The cyclic shear stress had a significant influence on the cyclic deformation, cyclic pore water pressure, cyclic strength, and cyclic shear modulus of coral silt.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Adeline S. Vio S. War, Neeraj Kumar, Souptick Chanda
Summary: The success of cementless hip stems depends on the primary stability of the implant at the bone-stem interface. Most studies on stem stability focus on static analysis and neglect the effect of dynamic gait loading. This finite element study compared the micromotion and load transfer of a grooved stem versus a plain stem under normal walking and stair climbing conditions. The results showed that dynamic loading significantly increased micromotion values for both stem designs, with the grooved stem exhibiting lower micromotion values overall.
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
(2023)
Article
Engineering, Civil
Qiangqiang Zheng, Ying Xu, Zhiqiang Yin, Feng Wang, Haijiang Zhang
Summary: This study aims to investigate the dynamic mechanical properties, strain field, energy evolution, and progressive cracking of damaged sandstone under impact loading. The experimental results show that the energy dissipation density ratio, scale of the initial central crack, strain, and level of rock fragmentation in the vicinity of the bar-sample interfaces all increase with increasing driving pressure or sandstone damage degree. These findings are of great significance to studying the mechanical responses of damaged rock and risk mitigation under dynamic catastrophes in rock engineering projects.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Construction & Building Technology
Nathan J. Edwards, Youli Lin, Hongjian Du, Dong Ruan
Summary: This study investigated the effect of graphene oxide (GO) on the static and dynamic mechanical properties and microstructure of cement mortar. Testing was done at strain rates up to approximately 290 s-1 using a split Hopkinson pressure bar apparatus. The addition of 0.005 and 0.01 wt% GO led to significant improvement in the strength of cement composites, especially at higher strain rates. The findings highlight the great potential of GO for improving the performance of cement composites under high strain rate loading.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Mechanics
Liming Zhou, Fangting Qu
Summary: Many engineering problems involve the coupling or interaction between different physics fields. In order to improve the efficiency and accuracy of calculations for magneto-electro-elastic materials in multiphysics fields, the MEE coupling isogeometric analysis method (MIGAM) is proposed. This method uses non-uniform rational B-spine (NURBS) functions for both geometric and analytical models, achieving seamless integration and ignoring mesh density effects. The MEE models, constructed using NURBS functions, are used to investigate the multiphysics coupling effects and static/dynamic responses under thermal and mechanical loading. Compared to the finite element method, MIGAM achieves higher efficiency by using fewer control points while maintaining sufficient accuracy for coupling multiphysics problems.
COMPOSITE STRUCTURES
(2023)
Article
Electrochemistry
Megan Flannagin, Baxter Barnes, William O'Donoghue, Jason Mayeur, Kavan Hazeli, George J. Nelson
Summary: Electrochemical changes were monitored by coupling external loading, electrochemical impedance spectroscopy (EIS), and distribution of relaxation times (DRT) analysis. The testing methods allowed for detailed observation of changes due to mechanical loading and distinguished responses between different cell geometries. Numerical modeling confirmed movement within individual cells and predicted locations with the most deformation based on applied external loading conditions.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Geochemistry & Geophysics
Hongbo Du, Haoran Wang, Peng Feng, Renjie Tian, Yi Wang
Summary: Preexisting fissures significantly affect the mechanical responses of rocks under coupled static-dynamic loads. The coupled dynamic strength of fissured rocks increases with the applied strain rate, while the elastic modulus does not depend on the loading rate. Fissured sandstone has the highest strength under a lower static prestress, and the failure modes change with the dynamic strain rate. Higher static prestress leads to greater energy dissipation density and efficiency.
Article
Chemistry, Multidisciplinary
Shaofei Yue, Kai Wang, Xiaoqiang Zhang, Tianhe Kang, Jianbing Yan, Yulong Jiang
Summary: In this study, the creep and hardening characteristics of anthracite under static-dynamic coupled loading were investigated using graded loading creep tests with different loading rates. The results showed that different loading rates influenced the creep and hardening characteristics of anthracite, and a functional relationship was established to describe this influence and predict its creep damage.
APPLIED SCIENCES-BASEL
(2023)