Article
Chemistry, Physical
Dominik Glowacki, Wojciech Mocko, Michal Marczak, Anna Glowacka, Cezary Kraskiewicz
Summary: This paper presents the testing methodology of specimens made of layers of titanium alloy Ti6Al4V in dynamic impact loading conditions. Results show that as the number of layers of titanium alloy increases, the force required for damage initiation and the absorbed energy during plastic deformation also increase, displaying a close to linear relationship.
Article
Engineering, Multidisciplinary
Ping Liu, MinQiang Meng, Yang Xiao, HanLong Liu, Gui Yang
Summary: Polyurethane foam adhesive (PFA) has been introduced as an alternative stabilizer in geotechnical applications, but its dynamic properties in reinforced soils are not well understood. Experimental results showed that PFA content, confining pressure, and consolidation stress ratio significantly affect the shear modulus and damping ratio of soils, while the loading frequency has negligible effect. A modified hyperbolic empirical model can predict the relationship between shear modulus and shear strain, with proposed upper and lower bounds for damping ratio.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Construction & Building Technology
Tuan Kiet Tran, Ngoc Thanh Tran, Duy-Liem Nguyen, Dong Joo Kim, Jun Kil Park, Tri Thuong Ngo
Summary: Research shows that in ultra-high-performance fiber-reinforced concrete, using a minimum of 1% fiber volume content can significantly enhance crack resistance. The fracture resistance and energy values at impact rates are significantly higher than those of ultra-high-performance concrete.
STRUCTURAL CONCRETE
(2021)
Article
Polymer Science
George Irven, Declan Carolan, Alexander Fergusson, John P. Dear
Summary: Epoxy foams with densities ranging from 180 to 500 kg/m3 were mechanically tested and a transition in fracture behavior at a critical density was observed. Lower density foams exhibited lower toughness and fracture energy, while higher density foams showed higher values. Stress-intensity factor increased monotonically with density. The distribution of cell size varied between lower and higher density foams. This study suggests the potential use of higher density foams in composite sandwich structures to achieve increased fracture energy.
Article
Construction & Building Technology
Atsushi Koyama, Daisuke Suetsugu, Yoshinori Fukubayashi, Hitoshi Mitabe
Summary: This study examines the dynamic deformation characteristics of rigid polyurethane foam, used as a lightweight embankment material. The results show that the shear modulus of single-layer samples is not significantly affected by the initial static stress, while the shear modulus of two-layer samples increases with increasing initial static stress.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Mechanical
Yehui Cui, Xiangguo Zeng, Vincent B. C. Tan, Zhilang Zhang
Summary: In this study, the dynamic fracture performances of NiTi alloy were comprehensively investigated through experiments and simulations. The fracture behavior was found to exhibit quasi-brittle features. A novel constitutive model was proposed to accurately reproduce the crack propagation process. Additionally, it was demonstrated that a smaller grain size could improve the intergranular fracture toughness.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Construction & Building Technology
Yanbo Wen, Zhichao Lai, Jiajia Ma, Huan Liu, Yin Wang, Hui Chi, Ruiyuan Huang
Summary: This study experimentally and numerically investigated the dynamic response of high-density rigid polyurethane foam (RPUF). The drop-weight tests were conducted under three impact velocities, and the test results showed that the dent depth and absorbed energy rise as impact velocity increases. A constitutive model for high-density RPUF was proposed based on the measured mechanical properties and it accurately described the dynamic performance of the material under impact loading.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
Sabrina Vantadori, Andrea Carpinteri, Roberto Cerioni, Camilla Ronchei, Daniela Scorza, Andrea Zanichelli, Liviu Marsavina
Summary: The fracture toughness of a polyurethane foam (PUR) is experimentally and numerically studied to analyze its dependence on specimen sizes. Interestingly, such analysis is lacking in the technical literature. The experimental campaign involves testing notched PUR foam beams of different geometrical sizes under three-point bending loading, and the fracture toughness is measured using the Modified Two-Parameter Model. The results are then compared with existing experimental data on the same PUR foam.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Mechanics
Arthur Lintner, Reinhard Pippan, Martin Schloffer, Anton Hohenwarter
Summary: Intermetallic titanium aluminides (TiAl) have great potential for high temperature applications due to their high specific strength, creep, and oxidation resistance, but their use for structural components is limited by low ductility and fracture toughness. A study was conducted to determine the fracture toughness of a third generation TiAl-alloy over a wide range of loading rates, and it was found that the dynamic fracture initiation toughness slightly increases up to loading rates of KI = 106 MPa root m/s.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Ceramics
Isabella Mendoza, Daniel Drury, Stylianos Koumlis, Jacob Ivy, Geoff Brennecka, Leslie Lamberson
Summary: In this study, coupon specimens of poled and depoled lead zirconate titanate (PZT) were examined under combined stress wave and electric loading conditions using ultrahigh-speed imaging and digital image correlation. The results showed that the addition of an electric field had a crack-enhancing effect on poled specimens, reducing their dynamic fracture toughness by almost half under +/- 0.46 kV/mm, while depoled samples experienced almost no change in dynamic fracture toughness with the addition of an electric field.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Mechanics
Yuezhao Pang, Xiaojun Yan, Jia Qu, Linzhi Wu
Summary: This study prepared two types of foam/fiber sandwich structures using the Vacuum Assisted Resin Transfer Molding (VARTM) process and conducted low-velocity impact tests to investigate their force response, specific energy absorption, and failure modes under different impact energies, hammer shapes, and impact positions. The results showed that the corrugated sandwich structure exhibited superior low-velocity impact resistance compared to the flat sandwich structure, and performed best when impacted at the corrugated trough position.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
George Irven, Declan Carolan, Alexander Fergusson, John P. Dear
Summary: Low density aramid and carbon fibre-reinforced epoxy foam was synthesized to improve mechanical properties, especially fracture performance. Fracture energy, compressive strength, and density of the foam were measured. The study investigated the influence of fibre type, loading, and length. The addition of fibres improved mechanical performance, with a significant increase in fracture energy and face-sheet bond propagation fracture toughness.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Mechanical
Feng Yu, Jian Fang, Daniel Omacht, Mingcheng Sun, Yingzhi Li
Summary: A new instrumented spherical indentation test (ISIT) methodology is proposed to determine fracture toughness of metallic materials with strain hardening described by a power-law function. Tensile properties are determined, and a dimensionless function is developed to calculate the critical indentation contact pressure (Pmcr). The critical indentation depth (hccr) and fracture toughness are then determined. The methodology has been applied to predict fracture toughness of different high strength steels with small errors.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Environmental Sciences
Anjali P. Sasidharan, V. Meera, Vinod P. Raphael
Summary: A novel adsorbent, PFCA, composed of chitosan nanoparticles and silver/silver oxide nanoparticles on polyurethane foam, was developed for phosphate removal. Experimental results demonstrated that PFCA effectively removed phosphate and maintained good removal performance even after multiple reuse cycles.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
L. Loefler, R. Hahn, P. H. Mayrhofer, M. Bartosik, D. Holec
Summary: This study investigates the influence of different interface orientations and magnetic configurations on the mechanical and structural properties of CrN/(TiN, AlN) superlattices. The oscillations of interplanar spacings were found to be unrelated to magnetic moments, emphasizing the importance of explicit consideration of interfaces and magnetic moments for accurate modeling of CrN-based superlattices. The theoretical predictions were supported by experimental results, highlighting the necessity of proper modeling techniques in studying materials with exceptional properties.
Article
Thermodynamics
Dan-Andrei Serban, Radu Negru, Hannelore Filipescu, Liviu Marsavina
Summary: This study investigates the relationship between failure strain of polyurethane rigid foams and stress triaxiality and Lode angle parameter. The results are validated through numerical models and analysis of sandwich structures.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Thermodynamics
Dan-Andrei Serban, Gabriel Furtos, Liviu Marsavina, Corina Sosdean, Radu Negru
Summary: This work investigates the mechanical behavior of composite materials consisting of fly ash-based geopolymer reinforced with wood fibers under compressive and flexural loadings, and calibrates constitutive models for the geopolymer using experimental data.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Roberto Brighenti, Liviu Marsavina, Mihai P. Marghitas, Mattia P. Cosma, Matteo Montanari
Summary: In this study, we investigate the relationship between the mechanical properties of LCD printed photopolymers and the printing process setup, using experiments and theoretical modeling.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Marco Pingaro, Maria Laura De Bellis, Emanuele Reccia, Patrizia Trovalusci, Tomasz Sadowski
Summary: Modern polycrystalline composite materials have a complex internal structure, and the study of their properties is of great significance. Numerical methods can be used to estimate the size and elastic properties of the materials, taking into account the random distribution of grains.
COMPOSITE STRUCTURES
(2023)
Article
Biochemistry & Molecular Biology
Masoud Tahani, Eligiusz Postek, Leili Motevalizadeh, Tomasz Sadowski
Summary: In this study, the effect of vacancies in SiC on the interdiffusion of SiC/Al interfaces is investigated using molecular dynamics. It is found that the interdiffusion of Al in SiC increases with the increase in temperature, annealing time, and vacancies.
Article
Materials Science, Characterization & Testing
P. Golewski, T. Sadowski, M. Knec, M. Budka
Summary: This study presents the results of laboratory tests on CFRP composite subjected to aging in different conditions. The results show that the aging process caused changes in the mechanical properties of the material, including a decrease in Young's modulus, an increase in Poisson's ratio, and a reduction in the strength of the CFRP composite. The study also observed additional modes of natural vibration in specimens with higher levels of thermal aging degradation.
Article
Crystallography
Masoud Tahani, Eligiusz Postek, Tomasz Sadowski
Summary: This study investigates the interdiffusion at the SiC/Al interface using molecular dynamics simulations. The average main and cross-interdiffusion coefficients are evaluated for different samples and the effects of temperature and annealing time are analyzed. The results show that the interdiffusion of Al in SiC is similar in both cubic and hexagonal SiC, and the coefficient increases with higher temperature and longer annealing time. The diffusion model can be used to evaluate the overall mechanical properties of the interface region in future studies.
Article
Engineering, Geological
Daniel Pietras, M. R. M. Aliha, Hadi G. Kucheki, Tomasz Sadowski
Summary: This study used four different specimens to measure the modes I and III fracture toughness values of gypsum. The ENDB specimen provided lower K-IIIc and a non-coplanar fracture surface compared with the CNCT specimen, which showed a planar mode III fracture surface. Additionally, the study found that the mode III fracture results were highly sensitive to the notch depth.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Construction & Building Technology
P. Golewski, T. Sadowski, M. Nowicki
Summary: This paper presents a novel concept of adhesive and hybrid joints fabrication using Additive Manufacturing (AM) technology. Different models of metal-polymer single lap joints were manufactured and tested using double-sided tape. The effectiveness of the joints was evaluated based on maximum force values, absorption energy, and repeatability of results. Hybrid joints produced with mechanical connectors and double-sided tape showed an increased maximum force value of 832.5 N compared to the reference model of 400.4 N.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Mostafa Fathalian, Eligiusz Postek, Tomasz Sadowski
Summary: A density functional theory (DFT) calculation was used to investigate the effect of vacancies on Al(111)/6H SiC composites. The DFT simulations with appropriate interface models are a valid alternative to experimental methods. C and Si vacancies reduce interfacial adhesion, while Al vacancies have little effect. The tensile properties can be improved by the presence of a vacancy, especially on the SiC side. The fracture toughness of Al/SiC is calculated using first principle calculations, and the density of states (DOS) is also calculated to understand the electronic properties. Rating: 8/10.
Article
Engineering, Mechanical
Wojciech Zbyszynski, Daniel Pietras, Tomasz Sadowski
Summary: 3D concrete printing is a popular technology in civil engineering, and this study aims to investigate the response of composite materials in the bending process to find their effective properties. Digital Image Correlation measurement technology was used to avoid additional external forces and the results showed decreased interlayer resistance in the layered beams.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Crystallography
Parviz Asadi, Mostafa Akbari, Mahyar Talebi, Maryam Peyghami, Tomasz Sadowski, Mohammad Reza Mohammad Aliha
Summary: Friction Stir Extrusion (FSE) is a process with great potential in shaping and improving the mechanical properties of the final product. The study focuses on extruding an LM13 aluminum sample with added silicon powder, resulting in an aluminum tube. Various tests and simulations were conducted to evaluate the mechanical properties and understand the impact of tool advancing speed. Results show increased compression strength by about 17% and improved wear resistance by about 20%.
Article
Construction & Building Technology
Mohammad Daneshfar, Abolfazl Hassani, Mohammad Reza Mohammad Aliha, Tomasz Sadowski, Arastoo Karimi
Summary: Adding fibers to concrete affects its ductility behavior and certain mechanical properties. Studying the relationship between fiber addition and thickness change of concrete test samples can assist in designing optimal thickness for concrete layers (especially pavements) to withstand dynamic loads. This research presents an experimental model for investigating the effect of concrete sample size or thickness on fatigue life of concrete. Results show that increasing specimen thickness and fiber content can enhance concrete fatigue life up to 68%.
Article
Green & Sustainable Science & Technology
Parviz Asadi, Mostafa Akbari, Amir Armani, M. R. M. Aliha, Maryam Peyghami, Tomasz Sadowski
Summary: Due to the high economic and environmental benefits, recycling metal chips, especially valuable alloys, has been considered. This study compares the sustainability of the Friction Stir Extrusion (FSE) technique with six different casting methods. Four sustainability indicators are evaluated and the FSE method achieves the highest levels in environmental, social, and mechanical indicators, with an overall sustainability score of 0.78. However, FSE still requires more attention in terms of economic feasibility.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Biochemistry & Molecular Biology
Masoud Tahani, Eligiusz Postek, Tomasz Sadowski
Summary: Modeling metal matrix composites in finite element software requires incorporating a cohesive zone model (CZM) to represent the interface between the constituent materials. This study investigated the effect of diffusion region formation on the traction-separation law in the interface of a SiC/Al composite under different loadings. The findings showed that the formation of a diffusion layer increased the strength and work of separation at the interface.
