Article
Chemistry, Multidisciplinary
Lucas Stuewe, Matthias Geiger, Franz Roellgen, Thorben Heinze, Marcus Reuter, Matthias Wessling, Stefan Hecht, John Linkhorst
Summary: This study advances the volumetric 3D printing technique xolography to a continuous process, enabling the continuous printing of objects with true shape and high resolution. By performing dual-color photopolymerization in a flowing resin within a specially designed flow cell, this technique offers the potential to scale up volumetric 3D printing and resolve the trade-off between high production rates and high resolution in light-based additive manufacturing.
ADVANCED MATERIALS
(2023)
Article
Engineering, Mechanical
Peng Liu, Wang Zhao, Yang Ju, Guoming Fu
Summary: This study introduces a visualization method using 3D printing models and photoelastic techniques to reveal and quantify the evolution of stress concentration at the flaw tips of flaw pairs under different biaxial loading schemes. The results suggest that the evolution of shear stress concentration at the dip angle of the flaw plays a primary role in crack initiation, and the propagation of shear cracks is the main cause of crack coalescence.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
Xiaolong An, Yahang Mu, Jiawang Chen, Jingjing Liang, Jinguo Li, Yizhou Zhou, Xiaofeng Sun
Summary: The addition of ZrO2 mineralizer aggravates light scattering effect during the curing process, but it also inhibits crack formation and improves high-temperature mechanical properties. Optimal mechanical performance can be achieved by controlling the content of ZrO2 mineralizer within the range of 2.0-2.5 vol%.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Multidisciplinary
Guizhong Xiao, Longfei Wen, Rong Tian, Dingguo Zhang
Summary: An improved XFEM (IXFEM) method is proposed for three-dimensional non-planar crack propagation under impact loadings. The method combines IXFEM and the B-spline ruled surface method (BRSM) to overcome the issues of standard XFEM in dynamic crack propagation. The proposed method employs an extra-DOF free PU approximation and tip singularity enrichment to ensure high accuracy. The BRSM is used to model the geometry of 3D dynamic crack propagation, and the interaction integral for 2D dynamic stress intensity factor (SIF) evaluation is extended to 3D. The efficiency of the proposed approach is demonstrated through numerical tests.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Manufacturing
Lucia Rodriguez-Pombo, Xiaoyan Xu, Alejandro Seijo-Rabina, Jun Jie Ong, Carmen Alvarez-Lorenzo, Carlos Rial, Daniel Nieto, Simon Gaisford, Abdul W. Basit, Alvaro Goyanes
Summary: 3D printing has potential in personalized medicine era, volumetric printing allows rapid drug printing with advantages in speed and overcoming limitations, drug release rates can be controlled by adjusting resin composition ratios.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Mechanical
Mingyang Teng, Jing Bi, Yu Zhao, Chaolin Wang
Summary: This study proposes a method for making rock-like samples containing embedded 3D flaws, and conducts a series of shear tests under different normal stresses. The test results show that the complex shear stress-shear displacement curve can be divided into four stages. The shear strength, residual strength, and shear modulus of the specimens are affected by the flaw dip angle and normal stress. Tensile failure is more likely to occur in low stress and small flaw angle specimens, while shear failure mainly occurs in high stress specimens. A sudden increase in AE counts, AE event rates, and a sudden decrease in b-value are usually precursors to rock failure. The RA/AF value can accurately reflect the classification and development of rock tension shear cracks. Damage locations of rock-like specimens in each stage are effectively identified through Kernel density estimation (KDE) analysis on the distribution of AE events. The movement of the maximum density point is consistent with the tendency of rock crack propagation, almost following the uniform diffusion of the specimens from the middle to the end.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Kun Peng Zhang, Yan Fei Liao, Bin Qiu, Yue Kun Zheng, Ling Ke Yu, Gong Han He, Qin Nan Chen, Dao Heng Sun
Summary: This research uses projection micro-stereolithography 3D printing technology and liquid metal filling method to manufacture conformal and 3D metamaterials, improving transmission properties of the metamaterial devices by optimizing filling channel layout and surface post-treatment process.
Correction
Engineering, Geological
Tao Zhou, Jianbo Zhu, Heping Xie
Summary: The article discusses the mechanical and volumetric fracturing behavior of three-dimensional printing rock-like samples.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Bin Wang, Einstom Engay, Peter R. Stubbe, Saeed Z. Moghaddam, Esben Thormann, Kristoffer Almdal, Aminul Islam, Yi Yang
Summary: In this study, we demonstrate a method for achieving high precision internal mechanical property gradients in 3D printing using tomographic volumetric printing (TVP) technology. By utilizing visible and UV light sources in conjunction with specific chemical reactions, we achieve full 3D stiffness control. Additionally, we identify the role of reactive transport of radical inhibitors in shaping the workpiece and limiting the achievable stiffness contrast range.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Jun Zhang, Linqi Huang, Xibing Li
Summary: Dynamic loading tests were conducted on sandstone specimens with different angles and depths of surface flaws. The results showed that the angle and depth of the surface flaw had a significant influence on the dynamic mechanical properties and energy dissipation of the specimens. The failure patterns were also affected by the angle and depth of the surface flaw.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Civil
Yu Zhao, Daguo Quan, Chaolin Wang, Mingyang Teng, Jing Bi
Summary: The cracking behavior of internal cracks in rock-like materials was studied using camphor sheets to embed flaws. Results showed that internal flaws significantly reduced the peak strength and elastic modulus of samples, with varying failure modes at different flaw inclination angles. Experimental and simulated results were in good agreement, revealing the crack evolution mechanism in rock-like samples with internal flaws.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Review
Polymer Science
Quinten Thijssen, Joseph Toombs, Chi Chung Li, Hayden Taylor, Sandra Van Vlieberghe
Summary: This review comprehensively discusses the potential of volumetric 3D-printing, summarizing the theoretical framework of photopolymerization and highlighting the advancements in light-based 3D-printing techniques. Special attention is given to the subfield of volumetric bioprinting. The review provides important discussions and prospects for those interested in the field of volumetric 3D-printing.
PROGRESS IN POLYMER SCIENCE
(2023)
Article
Engineering, Geological
Yi Liu, Feng Dai, Pengda Pei
Summary: This study focuses on the combined effect of water saturation and static pre-tension on the dynamic tensile strength of saturated rocks, and proposes an analytic solution for stress field of elliptical crack under coupled pore water pressure and far-field stress, along with a wing-crack extension model to analyze the dynamic fracturing behavior. Experimental results from coupled static-dynamic tension tests show a rational consistency with the theoretical results in terms of the dynamic tensile strength of saturated rocks.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Davide Ribezzi, Marieme Gueye, Sammy Florczak, Franziska Dusi, Dieuwke de Vos, Francesca Manente, Andreas Hierholzer, Martin Fussenegger, Massimiliano Caiazzo, Torsten Blunk, Jos Malda, Riccardo Levato
Summary: A novel technique called Embedded Extrusion-Volumetric Printing (EmVP) is introduced, combining extrusion bioprinting and layer-less, ultra-fast volumetric bioprinting. Light-responsive microgels are developed as bioresins for light-based volumetric bioprinting, providing a microporous environment for cell homing and self-organization. EmVP is used to create complex synthetic biology-inspired intercellular communication models, where adipocyte differentiation is regulated by optogenetic-engineered pancreatic cells.
ADVANCED MATERIALS
(2023)
Article
Engineering, Manufacturing
Mecit Altan Alioglu, Yogendra Pratap Singh, Momoka Nagamine, Syed Hasan Askari Rizvi, Vaibhav Pal, Ethan Michael Gerhard, Shweta Saini, Myoung Hwan Kim, Ibrahim T. Ozbolat
Summary: Over the past two decades, microfluidic devices have become revolutionary platforms in research and medicine. Existing fabrication strategies face challenges in recreating complex structural organizations. In this study, a silicone composite was developed and used as a support bath for 3D printing sacrificial ink, enabling the fabrication of complex-shaped microfluidic devices. The strategy allows for facile, rapid, cost-effective, and high-resolution printing, with potential applications in organ-on-a-chip devices, 3D bioprinting, and drug testing.
ADDITIVE MANUFACTURING
(2023)
Article
Computer Science, Software Engineering
Yumeng Tan, Xupeng Fu, Jianbo Zhu, Lina Chen
Summary: In this study, a multi-scale three-dimensional convolutional neural network lung nodule detection method was proposed to accurately detect lung nodules and reduce false positives. The method achieved high sensitivity and low false positive rate, providing valuable theoretical reference for clinical medicine.
CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE
(2023)
Article
Engineering, Mechanical
Shijie Xie, Zhenyu Han, Tao Zhou
Summary: A damage constitutive relationship is established based on the generalized equivalent strain principle and the initial tangent modulus to reflect the initial damage recovery. A Weibull distribution-based model is also established to represent the deformation after the compaction point. The combination of these two constitutive models yields a piecewise expression of the complete stress-strain curve of rocks under uniaxial compression.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Geological
Zhenghu Zhang, Jianbo Zhu, Jianhui Deng
Summary: This article introduces seven methods for determining joint normal stiffness in rock mechanics and conducts laboratory tests and comparisons. The results show that Method I, IV, and VI are reliable and accurate methods. These findings are helpful in solving discontinuous rock mass problems.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Automation & Control Systems
Jianghao Sun, Sitong Xiang, Tao Zhou, Tao Cheng
Summary: Traditional sampling methods often use the same strategy for all areas of complex surfaces, which may lead to low fitting accuracy due to missing extreme points in areas with large curvature variations. This paper proposes a new sampling method based on feature points for complex surfaces. The method includes curvature analysis, area division, uniform distribution for flat areas, feature point definition and search for sharply-edged areas, and curvature adaptive planning based on feature points. Experimental results show that the proposed method significantly reduces fitting errors and improves measuring accuracy compared to four traditional sampling methods.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Geological
Peiwang Cao, Tao Zhou, Jianbo Zhu
Summary: This study investigates the rate dependent behavior of mixed mode I/II fracture toughness in rock. Split Hopkinson pressure bar tests were performed on cracked sandstone specimens with different loading angles and strain rates. The results show that the peak load and peak strain increase with increasing strain rates while the influence of loading angle is almost negligible. Dynamic mode I and mode II stress intensity factors as well as effective fracture toughness increase rapidly with increasing strain rate before reaching a plateau. The findings of this study contribute to a better understanding of the rate effect of mixed mode I/II fracture and its micromechanism.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Mechanical
Jiaxin Wen, Lin He, Tao Zhou, Pengfei Tian, Tian Zhou, Zhiguo Feng
Summary: This study fills the research gap on the effect of grain size on machined surface integrity and burr formation by developing a model based on dislocation density and incorporating it into ABAQUS. The experimental results show that increasing the grain size reduces the cutting force but increases the burr size. This study provides a new theoretical basis for burr control and surface integrity improvement.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Geological
Hui Yang, Huan-Feng Duan, Jianbo Zhu
Summary: This study conducted ultrasonic tests on kaolinite- and bentonite-filled rock joints to investigate the effects of clay minerals and water saturation on elastic P-wave behaviors. The results showed that the water saturation and mineralogical compositions of the infilling have combined effects on P-wave signatures across single rock joints filled with clayey soils. The difference in heterogeneity saturation due to clay hydration is the main reason for the discrepancies in saturation-dependent P-wave attributes between kaolinite- and bentonite-filled rock joints. The findings contribute to a better understanding of wave propagation and attenuation across rock joints filled with fluid-saturated clayey soils.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Geological
Jiadong Qiu, Heping Xie, Jianbo Zhu, Jun Wang, Jianhui Deng
Summary: This study investigates the influence of joint distribution on the dynamic response of underground caverns through a series of experiments and numerical simulations. The results show that the joint has limited impact on the cavern when the dip angle is 0 degrees, 90 degrees, and 180 degrees, but becomes significant at 56 degrees and 134 degrees. Different joint distributions can also cause four types of rockbursts in the cavern, and the displacement changes of surrounding rocks can indicate the stability of the cavern.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Geological
Xuehan Yin, Tao Zhou, Changtai Zhou, Heping Xie, Jianbo Zhu
Summary: The effect of loading rate and normal stress on shear responses of rock materials was investigated using a bonded-particle model. A novel calibration methodology for direct shear test was proposed to effectively derive microscopic parameters and obtain macroscopic properties. Both normal stress and loading rate have a positive influence on shear strength, with normal stress having a greater impact.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
Erkang Zhou, Tianqi Zhai, Jianbo Zhu
Summary: Understanding wave propagation behavior in rock masses under different temperatures and geological conditions is crucial for evaluating the stability and safety of deep rock engineering projects. This study investigated the response and mechanism of ultrasonic waves in granites after thermal treatment. The results showed that heating temperature and grain size had a combined impact on wave propagation in the tested granites. The crack evolution was identified as the main reason for the seismic response of thermally treated granites. A damage factor and optimal wave indicators were proposed to evaluate the deterioration of granites at different damage stages.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Chang Che, Tao Zhou, Ming Yu
Summary: This paper presents a fourth-order combline filter with a screw-free tuning method to increase power capability. The resonant columns in the filter are covered with Teflon spheres to meet the power demands, and the top walls of the cavities are designed as hemispheres to maintain a uniform distance from the resonant columns, preventing breakdowns caused by high voltage. Additionally, mechanical deformation is introduced as a post-process tuning method, offering better performance than traditional tuning screws. The simulation and measurement results confirm the effectiveness of the proposed filter and tuning method.
2023 IEEE MTT-S INTERNATIONAL CONFERENCE ON NUMERICAL ELECTROMAGNETIC AND MULTIPHYSICS MODELING AND OPTIMIZATION, NEMO
(2023)
Article
Engineering, Multidisciplinary
Hao Quan, Wei Zhang, Wenjie Zhang, Zixiong Li, Tao Zhou
Summary: This paper proposes a new interval prediction method based on skip-GRU network and block bootstrap for short-term wind power prediction. Multiple subsets are generated using different bootstrap methods and skip-GRU models are trained with these subsets. The results of case studies demonstrate that the proposed method can obtain satisfactory prediction intervals and has higher overall quality compared to other bootstrap methods and benchmark models.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Article
Construction & Building Technology
Huayong Lv, Fei Liu, Xu Gao, Tao Zhou, Xiang Yuan
Summary: The caving property of top coal is crucial for successful top coal caving mining. The influence law of cyclic loading and unloading of hydraulic support on top coal caving plays a significant role in improving the recovery rate. This study simulated the dynamic evolution of top coal cracks under multi-cycle action and quantitatively analyzed the crack parameters. Results showed that top coal cracks could be categorized into horizontal and vertical cracks under cyclic loading and unloading. Increasing the number of cycles led to decreased support load, increased crack fractal dimension, number, and total length, resulting in improved top coal caving. Fractal dimension, total crack length, and crack rate first increased rapidly and then slowly with multi-cycle loading and unloading. The total length of top coal cracks and crack rate demonstrated a linear growth with changing fractal dimension. Multi-cycle loading and unloading can effectively enhance top coal caving and increase coal resource recovery rate.
STEEL AND COMPOSITE STRUCTURES
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Wenliang Zhang, Tao Zhou, Liu Liu
Summary: This paper investigates the radio propagation measurements and characterization of the narrow-beam channel in typical vehicle-to-infrastructure (V2I) scenarios. The empirical models are established for the narrow-beam channel modeling, which are helpful for the planning and optimization of 5G-V2X communication systems.
2023 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, WCNC
(2023)
Article
Engineering, Multidisciplinary
Tao Zhou, Rong-zheng Fang, Di Jia, Pei Yang, Zhi-ying Ren, Hong-bai Bai
Summary: In this study, virtual manufacturing technology was used to restore the 3D model of EPMWM and conduct thermal analysis to explore its thermal response mechanism. The spiral units containing unique structural information were extracted and counted, and a thermal resistance network was constructed to accurately predict the effective thermal conductivity of EPMWM. The experimental results show that the effective thermal conductivity of EPMWM increases with increasing temperature or decreasing density.
DEFENCE TECHNOLOGY
(2023)