Article
Engineering, Mechanical
Seyed Mahdi Hosseini, Jakob Melchior, Mohammadreza Izadi, Elyas Ghafoori
Summary: This study demonstrates a method for inhibiting fatigue crack growth by strengthening steel I-beams with pre-stressed CFRP composites. The research shows that pre-stressed CFRP composites can create a crack closure mechanism, reducing the likelihood of crack propagation. Furthermore, considering the stiffness of CFRP in the analytical formulation can decrease the amount of prestressing required to arrest fatigue crack growth.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Mechanics
Eman Saleh, Ahmad N. Tarawneh, M. Z. Naser
Summary: This paper proposes a method using support vector machine algorithm to identify the failure mode of FRP-RC beams, and obtains classification rules that outperform ACI 440 guidelines. The study shows that FRP-RC beams have sufficient deformability before failure, and suggests limiting the modulus of elasticity-to-the ultimate tensile strength of the FRP to ensure minimum deformability requirements.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Longbang Qing, Yile Wang, Mingqi Li, Ru Mu
Summary: Aligned and random steel fiber reinforced cementitious composites (ASFRC, SFRC) were prepared to investigate the influence of fiber orientation and volume fraction on the fatigue life and fracture behavior of composites. The experimental results showed that the fatigue life of ASFRC was more than 8 times longer than that of SFRC. Compared to SFRC, ASFRC exhibited an increase of over 17% in the critical effective crack length, allowing for greater deformation and crack propagation. Furthermore, a two-parameters fracture model considering the fiber volume fraction (Vf) was developed based on the experimental results to predict the fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
Felipe Vannucchi de Camargo, Ana Pavlovic, Evandro Cesar Schenal, Cristiano Fragassa
Summary: The study calibrated essential constitutive parameters for creating a virtual laminate that faithfully reproduces the response of a balanced basalt thermoset laminate to low-velocity impact, validated by experiments. The numerical model successfully replicated the behavior of the composite after accelerated ageing by high temperature and moisture exposure, with high correlation coefficients for force vs. time and force vs. displacement experimental curves. The final values of the constitutive parameters pointed to predominantly tensile failure in the matrix, confirmed by SEM analysis.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Junlong Du, Xiaosheng Wei, Cong Tian
Summary: In this research, the shrinkage cracking and fracture properties of fiber-reinforced cementitious composites (FRCC) were studied. It was found that increasing the polyvinyl alcohol (PVA) fiber content can effectively reduce crack width, delay cracking time, and enhance fracture toughness and fracture energy. PVA fibers play a crucial role in extending the intermediate stage of cementitious materials and delaying energy release rate during failure.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mechanics
Lu Che, Shuo Liu, Jun Liang, Guodong Fang
Summary: In this study, an improved lamina conjugated BB-PD model is established to study the fracture behavior of composite materials. The model defines four basic generalized PD bonds and determines the four micro-modulus parameters to describe the engineering material constants.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Mishal Thapa, Achyut Paudel, Sameer B. Mulani, Robert W. Walters
Summary: This paper presents a framework for stochastic progressive failure analysis of fiber-reinforced composites. Utilizing polynomial chaos expansion (PCE) technique can reduce computational cost while maintaining acceptable accuracy. The results demonstrate the cost-effectiveness and high accuracy of PCE, with successful identification of influential random material properties.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Mechanics
Bo Liu, Yunfei Zhou
Summary: In this paper, the damage failure mechanism of unidirectional SiCf/SiC composites under uniaxial tension was studied. The interfacial shear stress was described using Coulomb's law based on the conventional shear-lag model. The matrix cracking stress and interface debonding length were calculated using energy balance and fracture mechanics debonding criterion. The effects of various factors on the matrix cracking stress and the stress-strain curve of the composites were discussed.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
D. Pranavi, A. Rajagopal, J. N. Reddy
Summary: The proposed phase field model considers interfacial damage for different fiber configurations in composite materials, introducing anisotropy and capturing distinct contributions of fibers and matrix in elastic equilibrium. By considering factors such as fiber orientation, interface properties, and laminate configuration, the model captures predominant failure phenomena in composite materials.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
A. Ricoeur, F. Lindner, K. Zarjov
Summary: Due to the production process, short fiber reinforced composites exhibit significant anisotropy in both elastic properties and crack growth resistance. The influence of crack deflection on accurate prediction of crack paths must be considered. Statistical variations in fiber orientations and fiber-matrix adhesion lead to stochasticity in local fracture toughness anisotropy.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Review
Construction & Building Technology
Xiangzhou Liang, Juanzhao Peng, Ruobing Ren
Summary: This paper provides a comprehensive review of the shear performance of FRP-reinforced concrete beams, including shear failure characteristics, factors influencing shear capacity, calculation of shear capacity, shear durability, fire resistance, and future research needs. It is found that the low elastic modulus and the reduction of mechanical properties in the bending portion of FRP stirrups hinder the cracking control of concrete and result in insufficient shear performance and a significant size effect. Fibers can effectively enhance the post-cracking shear performance of different types of concrete. Replacement of FRP stirrups with FRP strips and grids offers a potential solution to improve the mechanical properties at the bending portion. Moreover, the use of ECC, FRP grid, and TRC for strengthening and skinning the beam, as well as prestressing, are potential methods to reduce the size effect and enhance shear capacity. Additionally, the application of artificial intelligence and continuous replenishment of a dynamic database are recommended to provide data support for the study of shear resistance of FRP-reinforced concrete members. Further research is needed to investigate the quantitative relationship between material degradation and component mechanical performance degradation.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Composites
M. G. Ranjithkumar, P. Chandrasekaran, G. Rajeshkumar
Summary: This study demonstrates that the incorporation of Phoenix sp. fibers improves the strength and fracture toughness of geopolymer composites, but reduces workability and bulk density. Additionally, a linear relationship is observed between bulk density and thermal conductivity, as well as ultrasonic pulse velocity and compressive strength. The water absorption of the composites also increases with the increase of fiber content due to the hydrophilic nature of Phoenix sp. fibers.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Composites
Robert B. Zando, Ataollah Mesgarnejad, Chunzhou Pan, Sandra J. Shefelbine, Alain Karma, Randall M. Erb
Summary: Crack deflection is often used as evidence of substantial fracture toughness in composites, with recent advances in composite manufacturing allowing for the creation of detailed microstructures that can locally tune fracture toughness anisotropy. In this study, a herringbone pattern structure effectively traps propagating cracks along a spine to enhance fracture toughness, demonstrating the potential for improved material properties through structural design. The results suggest that controlling crack propagation direction can significantly boost overall material performance.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Review
Green & Sustainable Science & Technology
Saptarshi Maiti, Md Rashedul Islam, Mohammad Abbas Uddin, Shaila Afroj, Stephen J. Eichhorn, Nazmul Karim
Summary: Sustainable fiber reinforced polymer (FRP) composites from renewable and biodegradable materials are of interest due to their potential to reduce environmental impacts, but their performance is still inferior to conventional glass or carbon FRP composites. This review provides an overview of sustainable FRP composites, including manufacturing techniques, sustainability considerations, and potential applications in various industries. The review also discusses future trends, challenges, and the outlook for sustainable natural FRP composites.
ADVANCED SUSTAINABLE SYSTEMS
(2022)
Article
Materials Science, Composites
Siwon Yu, Hrishikesh Bale, Seunggyu Park, Jun Yeon Hwang, Soon Hyung Hong
Summary: This study investigated the structural hierarchy and anisotropic fracture behaviors of 3D-printed fiber-reinforced composites, comparing different specimens and exploring microstructural changes during fracture processes. Color-coded segmentation images detailed crack growth, highlighting differences in fracture modes between specimens.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Selcuk Basdemir, Husnu Dal
Summary: Inverse Langevin function is essential in various scientific fields, but its exact analytical expression is difficult to obtain. This study proposes a simple and efficient one-pass predictor-corrector algorithm to accurately predict the inverse Langevin function, improving the accuracy of simpler approximants by an order of magnitude while maintaining a constant additional computational cost.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Biophysics
Alireza Jafarinia, Gian Marco Melito, Thomas Stephan Mueller, Malte Rolf-Pissarczyk, Gerhard A. A. Holzapfel, Guenter Brenn, Katrin Ellermann, Thomas Hochrainer
Summary: The morphological parameters of the dissected aorta, including the false lumen (FL) diameter and the size and location of intimal tears, play a crucial role in the formation of FL thrombosis in Type B aortic dissection (TBAD). When the FL diameter is larger than the true lumen diameter, there is a higher risk of partial thrombosis. Additionally, a higher ratio of distal to proximal tear size increases the risk of FL patency. These parameters are important in classifying the morphology of FL into patent, partially thrombosed, and fully thrombosed.
BIOMECHANICS AND MODELING IN MECHANOBIOLOGY
(2023)
Article
Engineering, Biomedical
Emmanouil Agrafiotis, Christian Mayer, Martin Grabenwoeger, Daniel Zimpfer, Peter Regitnig, Heinrich Maechler, Gerhard A. Holzapfel
Summary: This study examined the effects of thoracic endovascular repair (TEVAR) on the biomechanical properties of the aorta. It found that TEVAR resulted in reduced aortic distensibility, stiffness mismatch, and histological remodeling of the aortic wall. These findings have implications for improving stent-graft design and minimizing complications.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Biomedical
Anna Pukaluk, Heimo Wolinski, Christian Viertler, Peter Regitnig, Gerhard A. Holzapfel, Gerhard Sommer
Summary: This study focuses on the changes in collagen and elastin microstructure in the aortic adventitia under macroscopic equibiaxial loading. The results show that collagen fibers in the adventitia divide into two families under loading, while elastin fibers do not show clear orientation. These findings provide important insights into the stretching process of the aortic wall.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Biomedical
Francesco Giovanniello, Meisam Asgari, Ivan D. Breslavsky, Giulio Franchini, Gerhard A. Holzapfel, Maryam Tabrizian, Marco Amabili
Summary: In this study, scaffolds with ideal static and dynamic mechanical properties, similar to natural human aortas, were successfully obtained through an optimized decellularization protocol. This provides an ideal choice for developing innovative aortic grafts.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Multidisciplinary
Kevin Linka, Adrian Buganza Tepole, Gerhard A. Holzapfel, Ellen Kuhl
Summary: Choosing the best constitutive model and parameters in continuum mechanics has traditionally relied on user experience and preference. This paper proposes a new method that autonomously discovers the best model and parameters to explain experimental data using a neural network. The method is robust and satisfies physical constraints, and has the potential to revolutionize the field of constitutive modeling. Evaluation: 8 points
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Will Zhang, Javiera Jilberto, Gerhard Sommer, Michael S. Sacks, Gerhard A. Holzapfel, David A. Nordsletten
Summary: Biomechanics is important in diagnosing and treating heart conditions. Computational models can provide personalized treatment options but require accurate constitutive equations for biomechanical behavior prediction. A fractional viscoelastic modeling approach that accurately captures the viscoelastic response of the human myocardium was previously developed. This approach has comparable computational costs and only requires two additional material parameters. In this study, the implementation of this approach in Finite Element Analysis was presented, numerical properties were examined, and the physiological implications were explored.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Review
Cardiac & Cardiovascular Systems
Colton J. Ross, Arshid Mir, Harold M. Burkhart, Gerhard A. Holzapfel, Chung-Hao Lee
Summary: Hypoplastic Left Heart Syndrome (HLHS) is a congenital heart defect that requires a three-stage surgical palliation. Tricuspid regurgitation (TR) occurs in 25% of patients undergoing this procedure and is associated with increased mortality risk. Valvular anomalies and geometric properties are identified as the main predictors for poor prognosis in HLHS patients with TR. Future studies should focus on engineering-based metrics, multivariate analysis, and predictive models to determine the predictors of TR onset during the three palliation stages. These efforts will lead to the development of innovative tools for surgical timing decisions, prophylactic surgical valve repair, and improvement of current intervention techniques.
JOURNAL OF CARDIOVASCULAR DEVELOPMENT AND DISEASE
(2023)
Article
Engineering, Biomedical
Will Zhang, Majid Jadidi, Sayed Ahmadreza Razian, Gerhard A. Holzapfel, Alexey Kamenskiy, David A. Nordsletten
Summary: This study introduces a new viscoelastic constitutive model for the human femoropopliteal artery, which accurately describes its mechanical characteristics and time-dependent behavior. The model improves the accuracy of computational simulations and expands our knowledge of arterial mechanophysiology.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Biomedical
Federica Cosentino, Selda Sherifova, Gerhard Sommer, Giuseppe Raffa, Michele Pilato, Salvatore Pasta, Gerhard A. Holzapfel
Summary: This study investigates regional differences in ascending thoracic aortic aneurysms (ATAAs) in humans, highlighting the impact of fiber dispersion on microstructural properties and providing important biomechanical data for improving current risk stratification strategies.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Biomedical
Mohammad Javad Sadeghinia, Hans Martin Aguilera, Stig Urheim, Robert Matongo Persson, Vegard Skalstad Ellensen, Rune Haaverstad, Gerhard A. Holzapfel, Bjorn Skallerud, Victorien Prot
Summary: This study examines the mechanical behavior of Barlow and FED tissue by using biaxial mechanical tests and second harmonic generation microscopy. The results show that the Barlow sample and the most affected FED sample have different mechanical behavior and collagen structure compared to the other FED samples. The finite element model constructed based on this study shows good agreement with echocardiography and provides essential data for understanding the relationship between collagen microstructure and degenerative mitral valve mechanics.
ACTA BIOMATERIALIA
(2023)
Article
Mechanics
Daniel Ch. Haspinger, Gerhard A. Holzapfel
Summary: This study systematically analyzes the descriptive and predictive capabilities of the GST and AI approaches for modeling arterial mechanical behavior. Results show that there is no statistically significant difference in the descriptive features and minor deviations in the predictive aspects of the two modeling approaches.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Maximilian P. Wollner, Michele Terzano, Malte Rolf-Pissarczyk, Gerhard A. Holzapfel
Summary: This article develops a material model capable of reproducing anisotropy, viscoelasticity, stress softening, and permanent set by merging several pre-existing frameworks. Each constitutive effect is discussed separately in terms of its thermodynamics and mechanical interpretation and successively built on top of each other. The pseudo-elastic approach to permanent set occupies a special place in the formulation, with a novel discussion of its applicability to generic deformations. The capabilities and possible shortcomings of the formulation are highlighted and a simple numerical algorithm for stress computation is presented.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Misael Dalbosco, Michele Terzano, Thiago A. Carniel, Eduardo A. Fancello, Gerhard A. Holzapfel
Summary: This study presents a multi-scale computational analysis of abdominal aortic aneurysms (AAAs), which suggests that the formation of aneurysms disrupts the micro-mechanics of healthy tissue and triggers collagen growth and remodeling through mechanosensing cells. This leads to changes in the macro-mechanics and microstructure of the tissue at a cellular scale.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2023)
Article
Multidisciplinary Sciences
Michele Terzano, Maximilian P. Wollner, Manuel P. Kainz, Malte Rolf-Pissarczyk, Nils Gotzen, Gerhard A. Holzapfel
Summary: In situ tissue engineering provides a innovative solution for replacing valves and grafts in cardiovascular medicine. The mechanical behavior of the polymeric scaffold and its short-term response are studied using simulations and experiments.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2023)
