Article
Environmental Sciences
Abderrahim Khtibari, Said El Ouahbi, Abderrazak En-Naji, Abdelkrim Kartouni, Mohamed El Ghorba
Summary: The demand for polymers has been increasing over the past decade due to their unique properties. This has led mechanical engineers to study material damage problems, as partial or total ruptures resulting from these problems often cause accidents. This paper investigates the impact of strain rate on the damage of chlorinated polyvinyl chloride compounds through tensile tests conducted at different strain rates. Two damage models are developed based on the concept of stress, which enable the description and prediction of the mechanical behavior and damage development of chlorinated polyvinyl chloride.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Veterinary Sciences
Sofia Chalvatzi, Georgios A. Papadopoulos, Fotios Kroustallas, Mihaela Cernat, Vassilis Skampardonis, Christina Marouda, Vasileia Fotiadou, Vasileios Psychas, Theofilos Poutahidis, Leonidas Leontides, Paschalis Fortomaris
Summary: The study investigated the mechanical indices of hoof horn and their association with length measurements and lesion scores, finding significant differences in Young's modulus, yield stress, and maximum stress values among sows from different farms. An increase in heel-sole length was associated with a decrease in all mechanical indices. Young's modulus and yield stress were also linked to wall lesion severity, while maximum stress was related to wall and heel lesion severity.
VETERINARY SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Hussain Gharehbaghi, Amin Farrokhabadi
Summary: This study explores the mechanical properties of a new hexagonal pyramid unit cell with uniform porosity using the HSDBT. The mechanical properties are obtained through numerical modeling and finite element software. The elastic-plastic-damage behavior is implemented in a nonlinear finite element model to track the compressive behavior of the lattice structure. The results show that changes in the geometry parameter of the unit cell significantly affect the mechanical properties of the entire structure.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Polymer Science
Yan Li, Wenbo Luo, Maodong Li, Bo Yang, Xiu Liu
Summary: Directly using laboratory loading rates to evaluate the long-term creep strength of polymers is not conservative. A suitable strain rate-dependent constitutive model is crucial for accurately predicting the long-term strength and mechanical behavior of polymer pressure pipes. In this study, the Kondner hyperbolic constitutive model is considered as the base model, and the yield stress and initial tangent modulus are the two rate-dependent parameters. Uniaxial tension tests are carried out to obtain these two parameters, and it is found that the power-law rate-dependent Kondner model is more suitable for describing the rate-dependent tensile behavior of PE100 pipe material.
Article
Engineering, Multidisciplinary
Giuseppe Prestopino, Pier Gianni Medaglia, David Scarpellini, Sergio Bietti, Pietro Oliva, Salvatore Monteleone, Andrea Orsini, Daniele Barettin, Federica Caselli, Paolo Bisegna
Summary: Nanomechanics is a highly developed area of research that requires new theories to explain significant changes in material properties at the nanometer scale. This article presents a unique method to control electro-mechanical forces on quasi-1D nanostructures through static electric fields, enabling direct control of strain on GaAs nanowires grown on a substrate.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2023)
Article
Engineering, Mechanical
Guotang Zhao, Shuai Chen, Lei Wu, Zefeng Wen, Hengyu Wang
Summary: The mechanical properties of rail decarburized layer were studied through nano-indentation experiments and finite element simulation. The results showed that the Young's modulus and hardness near the surface of the decarburized layer decreased by 11% and 35% compared to the rail bulk, while the yield stress increased by 20%.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Physics, Multidisciplinary
Luana Campagnolo Bassotto, Ivana Zanella da Silva, Claudia Lange dos Santos
Summary: The effect of surface passivation on the mechanical properties of InAs and InP nanowires is investigated. The equilibrium lattice parameters of the nanowires decrease with decreasing diameter, and the Young's modulus of the unpassivated nanowires increases as the diameter decreases. The Poisson's ratio increases with decreasing diameters.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Physics, Multidisciplinary
Mohamed S. Abdelgawad, Ianto Cannon, Marco E. Rosti
Summary: Non-Newtonian fluids with interconnected elastic, viscous, and plastic properties are investigated through numerical simulations. The study focuses on turbulence in elastoviscoplastic fluids at high Reynolds number, particularly the effect of plasticity. The results show that increasing fluid plasticity reduces the active scales in the energy spectrum and introduces a new scaling range. Intermittency and enhanced extreme events are observed, driven by the non-Newtonian dissipation rate.
Article
Materials Science, Multidisciplinary
Jiangang Li, Xiao Lei, Jianhua Ding, Zhixiang Gao, Hua Wang, Yunlong Shi
Summary: The physical and mechanical properties of nanowires are strongly affected by surface effects. This study proposes a continuum theoretical scheme to describe the elastic property of nanowires, taking into consideration the decreasing influence of surface elasticity with increasing distance from the surface.
Article
Geosciences, Multidisciplinary
Shaohua Wang, Zhiguo He, Hengye Gu, Yuezhang Xia
Summary: The rheological properties of natural mud, including the two-step yielding process and the connection between storage modulus and yield stresses, were investigated in this study. The findings provide important insights for understanding the behavior of natural mud and have implications for various applications such as sediment transport and protecting seafloor infrastructure.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Polymer Science
Jared P. Klein, Zachary M. Gdowski, Richard A. Register
Summary: Polynorbornene synthesized by ring-opening metathesis polymerization can undergo epimerization during hydrogenation, producing semi-crystalline hydrogenated polymers with varying levels of trans configuration. As the trans content increases, the glass transition temperature, melting point, and enthalpy of melting decrease modestly, while the crystal transitions from rotationally ordered to disordered at higher trans contents. The Young's modulus at room temperature is not affected by the trans content, while the yield stress decreases gradually with increasing epimerization. The temperature dependence of the Young's modulus varies between trans-containing and all-cis polymers, while the temperature dependence of the yield stress is influenced by the polymorph type.
JOURNAL OF POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Fuan Yang, Jun Cai, Yong Zhang, Junpin Lin
Summary: The effect of crystallographic direction and temperature on the mechanical properties of a FeNiCrCoMn high-entropy alloy has been investigated using molecular dynamics simulations. The results show that the alloy exhibits different properties in single crystal and polycrystal forms, with the presence of 1/6 Shockley dislocations during plastic deformation. The yield stress, yield strain, and Young's modulus decrease with increasing temperature, with an asymmetry observed in the modulus of the single/double crystal under compression and tension loads. The strain point correlates with yield stress, FCC-HCP phase transition, and dislocation density, with the rate of change increasing with strain.
Article
Physics, Applied
Tursunay Yibibulla, Yijun Jiang, Shiliang Wang, Han Huang
Summary: The study measured the Young's modulus of Fe-catalyzed SiC nanowires and found that as the diameter of the nanowires decreases, the modulus decreases as well, and the temperature has a greater impact on the modulus. These findings are crucial for the design and fabrication of high-temperature mechanical sensors based on SiC nanostructures.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Liam S. Morrissey
Summary: With the increasing use of nanowires, it is important to understand how environmental interactions affect their mechanical properties. This study used molecular dynamics simulations to investigate the effect of atomic hydrogen on iron nanowires. The results show that increasing hydrogen concentration leads to a reduction in the elastic modulus and yield stress of the nanowires, with larger diameter nanowires being more affected.
MOLECULAR SIMULATION
(2023)
Article
Materials Science, Multidisciplinary
Chandra Shekhar Maurya, Chiranjit Sarkar
Summary: By adding laponite and oleic acid to the CI/water MR fluids, the magnetorheological properties were significantly enhanced with improved sedimentation stability. The interaction between laponite and oleic acid played a crucial role in achieving the desired results.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Nashat Nawafleh, Fatma Kubra Erbay Elibol, Mutabe Aljaghtham, Emre Oflaz, Andrew J. Ciciriello, Courtney M. Dumont, Edward Dauer, Recep M. Gorguluarslan, Teyfik Demir, Emrah Celik
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Engineering, Manufacturing
Nashat Nawafleh, Emrah Celik
ADDITIVE MANUFACTURING
(2020)
Article
Mechanics
Y. L. Hu, Yin Yu, E. Madenci
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
Cody Mitts, Samir Naboulsi, Craig Przybyla, Erdogan Madenci
ENGINEERING FRACTURE MECHANICS
(2020)
Article
Energy & Fuels
Mutabe Aljaghtham, Emrah Celik
Summary: Segmented thermoelectric generators with multiple materials have the potential to enhance energy conversion efficiency, but their thermal reliability at elevated temperatures and in annular configurations is questionable. This study introduces the concept of single material segmented TEG configuration as a solution to thermal stress issues. The unileg system significantly reduces thermal stresses, while also achieving higher power generation and thermoelectric conversion efficiency.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Engineering, Multidisciplinary
Deepak Behera, Pranesh Roy, Erdogan Madenci
Summary: This study investigates damage initiation and progression in bonded-lap joints with adhesives under quasi-static loading conditions using the weak form of peridynamic equilibrium equation. The fidelity of this approach is verified through comparison with benchmark solutions and successfully captures the deformation response and damage initiation sites.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Manufacturing
Daniel B. Perez, Emrah Celik, Ryan L. Karkkainen
Summary: Fused deposition modeling polymer 3D printing is popular, but mechanical properties are limited due to layer-by-layer deposition. The interface strength of 3D-printed PLA was determined through physical testing and simulations, with potential improvements identified by parameterizing gap morphologies.
3D PRINTING AND ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
Cagri Y. Oztan, Bejan Hamawandi, Yiqun Zhou, Sedat Ballikaya, Muhammet S. Toprak, Roger M. Leblanc, Victoria Coverstone, Emrah Celik
Summary: This research systematically doped stoichiometric Cu2Se compounds with gel-like Carbon Dots (CDs) and successfully enhanced the thermoelectric performance. The optimum doping ratio was found to be 2 wt%, resulting in a continuous enhancement of ZT to a maximum of 2.1.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Mechanical
E. Madenci, A. Barut, A. Yaghoobi, N. Phan, R. S. Fertig
Summary: This study introduces a fatigue model for constant and variable amplitude cyclic loading by combining KTF with PD, demonstrating the reliability of this model through simulations of composite laminates with open-hole defects under cyclic loads.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Ali C. Bekar, Erdogan Madenci
Summary: This study introduces an approach to identify significant terms in PDEs based on measured data using linear regression model, PDDO, and sparse linear regression learning algorithm. The solution is achieved through Douglas-Rachford algorithm with regularization, demonstrating effectiveness in handling challenging nonlinear PDEs.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Mutabe Aljaghtham, Emrah Celik
Summary: This study introduces the use of a single material (unileg) thermoelectric module in an annular configuration for the first time, which has been found to enhance thermoelectric performance and significantly reduce thermal stresses.
Article
Engineering, Multidisciplinary
William Jordan Wright, Hilmar Koerner, Dan Rapking, Andrew Abbott, Emrah Celik
Summary: Short fiber reinforced polymer composites fabricated by direct ink writing (DW) offer design flexibility, low cost, and tailored properties. The study focuses on controlling fiber alignment in these composites using two common printing parameters: nozzle diameter and velocity ratio. It was found that printing with smaller nozzle diameters and higher velocity ratios enhances fiber alignment, resulting in improved bending stiffness and strength.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Thermodynamics
Mutabe Aljaghtham, Emrah Celik
Summary: This paper presents a comprehensive analysis of novel unileg cascade thermoelectric systems, and simulation results show that unileg cascade systems perform significantly better than their unicouple counterparts in both two and three stage configurations, offering enhanced thermoelectric power generation and reduced thermal stress.
Article
Engineering, Manufacturing
William Jordan Wright, Joshua Darville, Nurcin Celik, Hilmar Koerner, Emrah Celik
Summary: This study presents a novel optimization framework that utilizes computer vision and deep learning to optimize the calibration and printing processes of thermoset composite AM. An integrated extrusion AM system is developed to determine the optimal printing parameters for composite ink, improving mechanical performance and minimizing labor-intensive procedures.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Mechanical
Juan Esteban Aponte Gonzalez, William Jordan Wright, Raden Gustinvil, Emrah Celik
Summary: The study demonstrates the feasibility of UV-assisted DIW for fabricating high-performance thermoset composites with complex geometries, overcoming the limitations of traditional DIW technology. This new approach has the potential to significantly expand the application range of additively manufactured thermoset composites in various engineering fields.
RAPID PROTOTYPING JOURNAL
(2023)
Article
Engineering, Mechanical
Zhuang Sun, Yixin Zhao, Yirui Gao, Sen Gao, Davide Elmo, Xindong Wei
Summary: In this study, the modified semi-circular bending test was used to investigate the fracture toughness of coal samples with different sizes and bedding angles. The results showed that the fracture toughness of coal exhibits size effect and anisotropy. The crack initiation and propagation in hydraulic fracturing of coal seam can be influenced by bedding angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Hien Do, Phuc L. H. Ho, Canh V. Le, H. Nguyen-Xuan
Summary: In this study, a new method for determining the limit loads of fracture structures using the pseudo-lower bound method with adaptive quadtree meshes is proposed. The method overcomes the volumetric locking problem and handles the challenge of hanging nodes during refinement procedure by using quadtree meshes. The effectiveness of the approach is demonstrated through numerical validation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Weimin Song, Yuxin Fan, Hao Wu, Liang Zhou
Summary: This study proposed a novel test method to characterize the I-II mixed fracture toughness of asphalt pavement and investigated the effects of reclaimed asphalt pavement (RAP) and loading rate. The results showed that loading rate and inclusion of RAP had positive effects on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Zida Liu, Diyuan Li, Jianqiang Xia, Quanqi Zhu
Summary: In this study, the influence of flaw inclinations on the failure mechanism of fissured granite specimens was analyzed through a series of experiments. A quantitative method combining deep learning and scanning electron microscope was employed to identify the mesoscopic fracture mechanism of macroscopic cracks. The results indicated that the failure of fissured specimens was mainly caused by tensile stress and shear stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Jiabing Zhang, Yiling Chen, Ronghuan Du, Xianglian Zhao, Jun Wu
Summary: This study investigated the mechanical characteristics and crack propagation behavior of sandstone-like samples with single cracks under freeze-thaw cycles. The results demonstrated the significant effects of crack angle and freeze-thaw cycles on the compressive strength and stability of the samples. Confining pressure inhibited the freeze-thaw deterioration, and the acoustic emission signals exhibited good consistency with the stress-strain curves. The simulation results matched well with the experimental results, and five crack propagation modes were proposed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Felix Boedeker, Pauline Herr, Anders Biel, Ramin Moshfegh, Stephan Marzi
Summary: Cohesive Zone Models with finite thickness are widely used for fracture mechanical modeling. Computational homogenization techniques are crucial for the development of advanced engineering materials. FFT-based homogenization scheme shows potential in reducing computational effort and has practical applications.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Sobhan Pattajoshi, Sonalisa Ray, Yugal Kishor Joshi
Summary: In this work, a novel multi-layer composite structure is proposed for protective shelter design. The dynamic behavior and mechanical performance of the multi-layer composite under projectile impact loading are investigated. The proposed composite target demonstrates enhanced penetration resistance and lesser damage compared to its reinforced concrete monolayer counterpart. An analytical model is also developed to predict the forces transmitted to the lowest layer for design purposes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
H. M. Shodja, M. T. Kamali, B. Shokrolahi-Zadeh
Summary: This study proposes a semi-analytical method for calculating the stress intensity factor of an internally pressurized eccentric annular crack. By using hypersingular integral equations and conformal mapping, accurate values of SIFs along the crack edges can be obtained. The material properties of the elastic matrix do not affect the SIF values, as demonstrated through the investigation of geometric parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Wen Hua, Zhanyuan Zhu, Wenyu Zhang, Jianxiong Li, Jiuzhou Huang, Shiming Dong
Summary: Accurate assessment and prediction of fracture behavior in cracked materials using mixed mode fracture criteria are crucial in fracture mechanics. This study comprehensively reviewed modified fracture criteria that incorporate T-stress for mixed mode I-II cracks. A comparative analysis was conducted between experimental results and theoretical predictions for five different cracked configurations. The study also discussed the effect of T-stress on crack initiation angle and fracture toughness, providing suggestions. The results showed variations in predictive accuracy across different cracked configurations due to disparities in T-stress. However, similar predictions were observed for semi-circular bend and edge-crack triangular specimens due to their similar biaxial stress ratio B. Different fracture criteria were suitable for different cracked configurations with positive or negative T-stresses.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Qing-qing Shen, Qiu-hua Rao, Wei Yi, Dian-yi Huang
Summary: This study proposes a theoretical approach to forecast multi-crack propagation trajectories in a finite plate. By calculating the stress intensity factor (SIF) and analyzing the influence of crack size, the criteria for crack initiation and propagation in a finite plate are established. Experimental results demonstrate that the SIF of multiple cracks in a finite plate is consistently larger than that of an infinite plate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Songbai Li, Qiyun Zhu, Zhizhong Lu, Hongzhi Yan, Chu Zhu, Peize Li
Summary: This study investigates the effects of laser heating and laser shot peening on fatigue life of AA2524, and predicts the fatigue life using artificial neural networks and support vector regression models. The results show that laser heating and laser shot peening can significantly improve the fatigue life, and the neural networks have better prediction ability.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
V. Shlyannikov, A. Sulamanidze, D. Kosov
Summary: This paper presents experimental crack-growth data for thermomechanical fatigue conditions in nickel-based alloy components. The crack-growth experimental results are interpreted using finite element analyses and multi-physics numerical calculations. The results show that crack growth rate is slower under isothermal pure fatigue conditions, while it is faster under thermomechanical cyclic deformation conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Tairui Zhang, Xin Ma, Bin Yang, Wenchun Jiang, Zhiqiang Ge, Xiaochao Liu
Summary: This study experimentally investigated the fracture toughness distributions in dissimilar metal welds. The predictions of fracture toughness were made using three criteria and an energy release rate model. The results showed that using the critical strain criterion and ERR model resulted in higher consistency compared to mini-CTs, while the predictions using the critical stress criterion had high dispersion. The study also investigated the source of errors through damage developments and SEM observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Yike Dang, Zheng Yang, Xiaoyu Liu, Jianghao Guo
Summary: This study uses discrete element modeling to examine bedded rock failure with parallel defects. It is found that bedding influences crack propagation direction but has limited impact on final failure. Shear failure accumulates at the bridge area and defect tip, while tensile failure occurs during nucleation region development.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
