Article
Engineering, Mechanical
Joanna Malecka, Tadeusz Lagoda
Summary: This paper presents the fatigue behavior of RG7 bronze under cyclic bending, cyclic torsion, and their combination. An elasto-plastic deformation model was proposed to describe the fatigue process, and the causes of damage were determined through microscopic observations. It was found that the fatigue fractures were similar under different test conditions, indicating no qualitative difference in the nature of the fatigue process.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Review
Cell & Tissue Engineering
Qianli Ma, Zahra Miri, Havard Jostein Haugen, Amirhossein Moghanian, Dagnjia Loca
Summary: In 1892, J.L. Wolff proposed that bone could respond to mechanical and biophysical stimuli as a dynamic organ, providing an opportunity for investigations on bone and its potential for tissue repair. Mechanical stimulation through activities like exercise or machinery application can affect the differentiation and development of mesenchymal tissue. The review aims to clarify the extent to which mechanical stimulation can aid in bone tissue repair and regeneration, the underlying mechanisms, and the importance of vascularization in nutrient supply for bone healing and regeneration.
JOURNAL OF TISSUE ENGINEERING
(2023)
Article
Agricultural Engineering
Haocheng Xu, Jing Li, Hankun Wang, Xinwu Xu
Summary: The research investigates the fracture mechanism and mechanical properties of bamboo under bending-shear coupling effect. The results show bamboo's linear decrease in bending moment and constant distribution of shear force along the strip's length. The study establishes a numerical structure activity relationship, elucidating its bending-shear coupling performance and providing valuable reference for biomimetic material production.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Construction & Building Technology
Jun Zhang, Zihao Yu, Yuxiang Tang, Jie Shen, Hongniao Chen
Summary: This study investigated the fracture properties of concrete under cyclic loading through three-point bending tests and ESPI technique. The experimental results showed that the load-displacement curves can be divided into five stages, with CMODc increasing with loading cycles while CTODc remains constant. The cumulative dissipative energy can be used as a fracture parameter.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Computer Science, Interdisciplinary Applications
Enhao Zhang, Saeed Miramini, Lihai Zhang
Summary: This study investigates the combined effects of osteoporosis and diabetes on fracture healing process by developing numerical models. The results show that osteoporotic fractures have higher instability and disruption in mesenchymal stem cells' proliferation and differentiation compared to non-osteoporotic fractures. Moreover, when osteoporosis coexists with diabetes, the healing process of fractures can be severely impaired.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2024)
Article
Engineering, Mechanical
Wojciech Macek
Summary: The article presents the results of fractal dimension measurements on the fatigue fracture surfaces of 10HNAP and S355J2 steels specimens after combined bending-torsion fatigue. The entire fracture surfaces were measured using an optical profilometer. Guidelines for further estimation of the method of failure were formulated based on the analysis of fractal dimension delineated by the enclosing boxes method.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Materials Science, Multidisciplinary
Jiuyang Li, Li Chen, Guangchao Hu, Jinpeng Guo, Zhenwei Wang, Wenbo Lu, Jingwei Luo, Xinmei Fan, Yuepeng Zhu, Xiaoyu Wang, Wenzhong Zhu
Summary: Cracks frequently occur in concrete structures due to factors like load and environment exposure, which greatly affect their safety and durability. Real-time tracking and monitoring of cracks in concrete structures is therefore crucial. In this study, the strength, toughness, and crack self-monitoring performance of smart concrete mixes were investigated by adding two conductive materials, steel fiber and nano carbon black, into the concrete. The effects of these conductive materials on compressive strength, bending toughness, and electrical conductivity were studied, followed by an analysis of crack self-monitoring performance and mechanism in smart concrete beam members under load. This research provides valuable insights and new findings for the development of low-cost smart concrete regarding material properties and crack self-monitoring performance.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
R. Branco, P. Prates, J. D. Costa, A. Cruces, P. Lopez-Crespo, F. Berto
Summary: This paper uses the cumulative strain energy density to predict the fatigue life of notched members under multiaxial loading. The relationship between energy absorbed and cycles to failure is established, and the proposed model is compared to other stress-based and energy-based models. The results show that the proposed model has good predictive capabilities and outperforms the other tested models.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Biotechnology & Applied Microbiology
Qiang Huang, CongMing Zhang, HuanAn Bai, Qian Wang, Zhong Li, Yao Lu, Teng Ma
Summary: The existing implants for fixation of femoral neck fractures have poor biomechanical stability, so the failure rate is high. We designed two modified intramedullary implants for treating unstable femoral neck fractures. The modified intramedullary implants exhibited the best biomechanical stability among the five implants included in this study.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Geological
Prateek Negi, Tanusree Chakraborty, Suresh Bhalla
Summary: Cyclic loading deteriorates the strength of structures slowly, potentially leading to fatigue failure. The study investigates the feasibility of using piezo-based sensors and the electro-mechanical impedance technique for timely detecting damages in rocks under cyclic loading, showing promising potential in structural health monitoring of rocks.
Article
Construction & Building Technology
Mohammad Hossein Iji, Ali Nayebi
Summary: This paper investigated the failure of a thin-walled tube using three failure models, with both proportional and non-proportional loading paths. The effects of hydrostatic stress and stress triaxiality parameter on plastic flow and failure were discussed. Each failure model was used to predict failure loads, and the results were compared.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Shutong Yang, Mingxin Wang, Tian Lan, Shutong Liu, Zhongke Sun
Summary: In order to assess the safety of concrete structures under dynamic loading conditions, it is necessary to understand the rate dependences of concrete fracture parameters. This study aims to develop a fracture model to determine the size-independent tensile strength, fracture toughness, and fracture energy of concrete under different loading rates. The fracture mechanism was analyzed through bending tests on concrete beams, and a fracture model was proposed to predict these fracture parameters. The study provides insights into the fracture behaviors of concrete under different loading rates and guidance for disaster prevention of concrete structures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
T. D. Campos, M. L. S. Barbosa, A. A. R. Olmos, M. Martins, F. A. M. Pereira, M. F. S. F. De Moura, A. Zille, N. Dourado
Summary: This study evaluates the strain energy release rate under mode I loading in a bone-cement bonded joint and measures cohesive zone laws using the finite element method and non-linear elastic fracture mechanics. The results show consistent fracture toughness in a cortical bone bonded joint with polymethylmethacrylate (PMMA).
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Geological
Zexu Ning, Yiguo Xue, Zhiqiang Li, Maoxin Su, Fanmeng Kong, Chenghao Bai
Summary: Through studying the cyclic loading-unloading compression of granite under hydro-mechanical coupling, it is found that the damage, permeability, and residual strain of the rock are interrelated. The magnitude of cyclic load has a controlling effect on the fatigue behavior of the material. The relationship between permeability and residual strain of the specimens varies with different loading magnitudes. Cyclic load not only causes fatigue damage to rock but also has a compaction effect.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Civil
Yuhan Liang, Zongping Chen, Xiang Liu, Haoyu Liao
Summary: The seismic behavior of RC cross-shaped columns under combined loading conditions was studied through experiment and numerical simulation. The effects of torsion-bending ratio and axial compression ratio on the seismic indexes were investigated. Experimental results showed that the T/M ratio determines the failure modes of the columns. The columns exhibited good ductility and deformation capacity under torsion loading. Based on the experimental results, hysteretic models and finite element simulation were proposed and validated.
Article
Construction & Building Technology
Markos Tsegaye Beyene, Felicite Kingne, Eleni Tsangouri, Michael El Kadi, Tamene Adugna Demissie, Hubert Rahier, Danny Van Hemelrijck, Tine Tysmans
Summary: Researchers investigated the effects of replacing Portland cement with supplementary cementitious materials (SCM) on the durability of Ensete ventricosum (Ev) fibres in cementitious matrices. The flexure tests showed that composites with 100% Portland cement matrix lost ductility and strength after 25 wet-dry cycles, while ternary matrices of 70% FA and 10% MK exhibited minimal degradation. Partial replacement of Portland cement by SCMs can reduce the degradation of natural fibres in cement-based composites.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Composites
Michael El Kadi, Danny Van Hemelrijck, Tine Tysmans
Summary: The use of textile-reinforced cement (TRC) composites can lead to significant material savings, especially in thin-walled structures. This study experimentally investigated the effect of discretely inserted spacer connections on the flexural properties and cracking behavior of TRCs. The results showed that the placement of spacer connections strongly influenced the post-cracking stiffness and modulus of rupture (MOR) of the TRCs.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Article
Chemistry, Physical
Efstratios Polyzos, Hendrik Pulju, Peter Maeckel, Michael Hinderdael, Julien Ertveldt, Danny Van Hemelrijck, Lincy Pyl
Summary: This article presents a novel approach that utilizes machine learning and polynomial chaos expansion to assess the effects of residual stresses in laser-directed energy deposition (L-DED). The approach involves measuring the thermal expansion coefficient of thin-wall L-DED steel specimens and using it to predict the displacement field in incremental hole-drilling tests. Experimental measurements from 3D micro-digital image correlation setup show good agreement with the predictions.
Article
Polymer Science
Efstratios Polyzos, Danny Van Hemelrijck, Lincy Pyl
Summary: This article introduces the development and implementation of the Delamination Plug-in, an open-source tool for modeling delamination tests in the ABAQUS software. The plug-in combines the benefits of GUI and FE programming and provides algorithms for various delamination tests. It is demonstrated to be efficient and applicable for both conventional and 3D printed composite laminates.
Article
Construction & Building Technology
Gerlinde Lefever, Ahmad Shawki Charkieh, Mustafa Abbass, Danny Van Hemelrijck, Didier Snoeck, Dimitrios G. Aggelis
Summary: The inclusion of superabsorbent polymers (SAPs) is increasingly attractive to promote the self-healing ability of cementitious materials and reduce manual repair costs. Ultrasonic monitoring is used for non-destructive evaluation to determine the effectiveness and compare the healing capacity of different mixtures. However, previous studies mainly focused on mortars without large aggregates, so monitoring and comparing the self-healing of concrete and mortar were conducted. Ultrasonic surface wave monitoring shows the potential to evaluate crack closure and the effects of different SAPs.
DEVELOPMENTS IN THE BUILT ENVIRONMENT
(2023)
Article
Engineering, Manufacturing
Amalia Katalagarianakis, Efstratios Polyzos, Danny Van Hemelrijck, Lincy Pyl
Summary: This study experimentally investigates the delamination behavior of carbon fiber-reinforced polyamide laminates under different loading modes. The interlaminar fracture toughness at crack initiation was found to be 1.5 kJ/m2 in mode I, 2.1 kJ/m2 in mode II, and 1.0 kJ/m2 in mixed mode I-II. Various analytical and numerical models were used to validate the experimental results, and scanning electron microscopy revealed the micro-mechanical origins of the crack in different loading configurations.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Multidisciplinary
E. Polyzos, D. Van Hemelrijck, L. Pyl
Summary: This study presents a new stochastic modeling approach to address challenges in micromechanical modeling of short-fiber composites. It introduces a stochastic generation technique based on kernel density estimation to save time and effort in fiber extraction, and a novel semi-analytical approach to consider multiple fibers while reducing computational effort. The approach is demonstrated on recycled poly(ethylene terephthalate) filaments reinforced with recycled short carbon fibers for additive manufacturing, showing similar predictions of elastic properties using only 40-50 fibers compared to a direct modeling approach with 1050 fibers, and close agreement with experimental data.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Mechanics
Ali Shivaie Kojouri, Haniyeh Khosravi Rikaee, Kalliopi-Artemi Kalteremidou, Danny Van Hemelrijck
Summary: This study examines the capability of the digital image correlation method to determine the Jintegral for polymers with elastic and elastic-plastic behavior. To achieve this, single-edge notch tension specimens manufactured out of PMMA and HDPE are tested under pure mode I loading conditions, and the displacement field at the surface of each specimen is obtained using DIC. The J-integral for each specimen is then computed by combining the higher-order singular and non-singular terms derived from DIC.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
E. Polyzos, D. Van Hemelrijck, L. Pyl
Summary: This article presents a new analytical solution to the delamination problem of interface deformable generally layered composite laminates. The governing equation for interface forces and moments is obtained under plane strain assumptions, considering extension-bending coupling phenomena and residual hygrothermal stresses. The interface forces and moments are included in a novel generalization of the J-integral to estimate the Energy Release Rate (ERR). The analytical results of ERR and mode mixity show excellent agreement with Finite Element models for a Double Cantilever Beam test of a generally layered fibre metal laminate, utilizing the Cohesive Zone Method (CZM) and the Virtual Crack Closure Technique (VCCT).
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Mechanics
E. Polyzos, D. Van Hemelrijck, L. Pyl
Summary: A novel approach is proposed in this study to convert real voids to ideal supercylindrical ones, which better approximate the shape of voids and can be described by a single parameter. The elastic properties of acrylonitrile butadiene styrene are predicted using the polynomial chaos expansion technique. The results are compared with previous tensile tests and different modeling approaches to gain a comprehensive understanding of the advantages of the new approach.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
E. Polyzos, D. Polyzos, D. Van Hemelrijck, L. Pyl
Summary: The majority of studies in the open literature use homogenization models to consider microstructural parameters, but they fail to account for size effects at small scales. This study introduces a novel approach that combines property contribution tensors with strain gradient elasticity to capture size effects and improve predictions about effective elastic properties.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Manufacturing
E. Polyzos, C. Nikolaou, D. Polyzos, D. Van Hemelrijck, L. Pyl
Summary: This study introduces a new method for creating accurate microscale finite element models of 3D printed composites. It utilizes micro-CT and neural network algorithms to differentiate and predict the distribution of fibers in the microstructure, and uses finite element analysis to determine the elastic properties of the composite material. The results show that this method is accurate and reliable, and also reveal the transversely isotropic behavior of the printed composites.
ADDITIVE MANUFACTURING
(2023)
Proceedings Paper
Construction & Building Technology
Gerlinde Lefever, Nele De Belie, Danny Van Hemelrijck, Dimitrios G. Aggelis, Didier Snoeck
Summary: This study evaluates the closure of cracks in cementitious mixtures with and without superabsorbent polymers using ultrasound measurements. By sending ultrasonic waves through the cracks, information on both the sound material and the healing products formed within the cracks is obtained. The healing process is promoted by wet-dry curing cycles and monitored for 14 days. Ultrasound was found to be sensitive to the closure of cracks, as confirmed by microscopic analysis of the reduction in crack width opening.
PROCEEDINGS OF THE 75TH RILEM ANNUAL WEEK 2021
(2023)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Construction & Building Technology
Gerlinde Lefever, Ahmad Shawki Charkieh, Danny Van Hemelrijck, Didier Snoeck, Dimitrios G. Aggelis
Summary: Non-destructive evaluation using air-coupled ultrasound provides an efficient method for assessing the self-healing ability of cementitious composites.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
