Article
Mechanics
S. Abdel-Monsef, B. H. A. H. Tijs, J. Renart, A. Turon
Summary: This study proposes a new cohesive zone model description to overcome the limitations of existing models in the presence of a large fracture process zone. The new approach allows for convenient implementation of any arbitrary shape obtained experimentally.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Yabin Yan, Guoqing Xu, Fuzhen Xuan
Summary: This study presents an efficient methodology to assess fracture behavior in nanoscale multilayers. The fracture strength of interfaces and SiN layer was determined using an exponential cohesive zone model (CZM) and the crack propagation from the notch tip was analyzed by phase field simulation. This study provides significant insights into the fracture behavior occurred at nanoscale and a simple but efficient methodology to evaluate the fracture strength of any part in nanoscale multilayers.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Sukhminder Singh, Lukas Pflug, Michael Stingl
Summary: Advances in computational modeling of solid fracture have led to new possibilities for structural design optimization to enhance fracture properties. By introducing viscous regularization and local approximation of cohesive law, the issue of non-uniqueness in rate-independent structural problems is addressed, allowing for integration of fracture problems into material optimization framework.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
Mathilde Zani, Daniele Fanteria, Anita Catapano, Marco Montemurro
Summary: This study presents a consistent energy-based cohesive zone model for simulating the mode I delamination behavior of FUMD laminates and validates the effectiveness of the model through experiments. The numerical simulations closely replicate the delamination behavior of DCB specimens, but with some differences compared to experimental results.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Hong-Kyun Noh, Myeong-Seok Go, Jae Hyuk Lim, Yun-Hyuk Choi, Jong-Gu Kim
Summary: In this study, numerical simulation and experimental validation were used to investigate the lamina fracture and progressive interlaminar failure behavior of a composite dovetail specimen. The results showed that through-thickness compression can enhance the interphase properties of the composite, but it also degrades the tensile strength and in-plane shear stress, which significantly affects the overall tensile behavior of the specimen.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Anouar El Moustaphaoui, Abdelkarim Chouaf, Khadija Kimakh
Summary: The characterization and modeling of Ceiba plywood delamination require extensive experimental and numerical studies. The cohesive zone model is a widely used method for characterizing delamination, and parameters are often iteratively determined by matching numerical and experimental results. Experimental tests help evaluate delamination resistance under different loading conditions.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Polymer Science
Luis Torres, Karin Saavedra, Gonzalo Pincheira, Juan Carlos Pina
Summary: This paper focuses on the mode I delimitation of a unidirectional GFRP composite and proposes a simple and accurate characterisation of three cohesive zone models using the LEFM R-curve framework. The results show that parameter identification using the equivalent LEFM R-curve can achieve the same accuracy with a 72% reduction in numerical efforts. Strategies based on physical models are still better solutions in cases where evaluating the objective function is expensive, despite the popularity of optimization techniques for their easy numerical implementation.
Article
Mechanics
Amin Farrokhabadi, Sara Neyestani, Davood Akbari, Reza Sarkhosh
Summary: The study found that using Glass-Kevlar-Epoxy hybrid laminate can enhance stiffness and delamination growth capacity in composite laminates. Experimental and numerical results show that hybridization and staking sequences have an impact on induced delamination growth.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Biomedical
Marta Alloisio, Christian Gasser
Summary: In this study, a parameter identification pipeline was proposed to extract tissue properties from force-displacement and digital image correlation (DIC) data, which play a crucial role in understanding the fracture properties of vascular tissue. The model closely replicated the experimental observations and identified the fracture energies of the porcine aorta. The findings reveal the lower strength of the abdominal aorta and have significant implications for the clinical evaluation of the risk of aortic rupture.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Mechanical
Tahir Soyuguzel, Zahit Mecitoglu, Huelya Kaftelen-Odabasi
Summary: An experimental and computational study was conducted to investigate the toughening effect of nitrogen-doped reduced graphene-oxide particles (ND-RGOP) in delamination of carbon fiber/epoxy laminates. The results showed that the addition of ND-RGOP significantly enhanced the delamination toughness in both mode I and mode II. FESEM images confirmed the rough delamination path and increased interlaminar fracture toughness due to the presence of ND-RGOP. The simulations also supported the toughening effect of ND-RGOP.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
I. T. Tandogan, T. Yalcinkaya
Summary: This paper develops a physically motivated cohesive zone modeling framework for ductile fracture in metallic materials, considering the physical mechanisms of crack initiation and propagation. A micromechanically motivated traction-separation relation is used to describe the growth of a physical pore. An incremental implicit elasto-plastic numerical integration scheme is utilized for solving the mixed-mode system of equations. Numerical simulations are conducted to test the implementation and influence of micromechanical parameters on crack initiation and propagation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Review
Polymer Science
Biltu Mahato, Stepan V. Lomov, Aleksei Shiverskii, Mohammad Owais, Sergey G. Abaimov
Summary: This paper provides an overview of the application of nanofiber polymeric veils as toughening interleaves in fiber-reinforced composite laminates. It presents a comparative analysis and summary of attainable fracture toughness improvements based on electrospun veil materials. The toughening mechanisms introduced by polymeric veils are identified, listed, and analyzed, and the numerical modeling of failure in Mode I and Mode II delamination is discussed.
Article
Mechanics
Dingli Tian, Yu Gong, Luohuan Zou, Wenjuan Lin, Jianyu Zhang, Libin Zhao, Ning Hu
Summary: This study proposes a simple and efficient approach to determine an n-segment constitutive law, which can simulate the R-curve behavior in the delamination growth process of composite laminates. The approach is easy to use and does not require parameter adjustment, making it suitable for determining any n-segment constitutive law and practical application.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Yu Gong, Hexiang Zhang, Linfei Jiang, Zhaohu Ding, Ning Hu
Summary: This study proposes a semi-analytical approach to accurately determine the fracture toughness and bridging law for composite structural design. The approach shows good agreement with test results and is applicable for engineering application. It eliminates the need for specific equipment and tedious measurements, making it simple and efficient.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Jinci Chen, Jiangteng Li, Ju Wang, Zhanming Shi, Hang Lin, Xing Zhang
Summary: This paper focuses on the macro-mesoscopic analysis of fracture characteristics in the fracture process zone (FPZ) subjected to cyclic loading. Experimental results show that cyclic loading has a significant effect on fracture toughness and the nonlinear fracture toughness based on FPZ is reduced at different amplitude levels. The use of cohesive zone model (CZM) and digital image correlation (DIC) method helps characterize the evolution and parameters of the FPZ.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
B. H. A. H. Tijs, M. H. J. Doldersum, A. Turon, J. E. A. Waleson, C. Bisagni
Summary: This study investigates the strength and failure behavior of conduction welded thermoplastic composite joints through numerical and experimental evaluation. The research finds that the joint strength is highly influenced not only by the failure mechanisms of the welded interface but also of the surrounding plies. The high-fidelity modeling methodology can predict the experimental failure mode of welded joints with high accuracy and offers new insights into the key variables influencing the strength of thermoplastic welded joints.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Manufacturing
P. Maimi, A. Ortega, E. Gonzalez, J. Costa
Summary: This passage discusses the determination of translaminar fracture toughness of laminated composites using linear elastic fracture mechanics (LEFM) or cohesive zone model (CZM). It compares the complexity and predictive capabilities of each theoretical framework, and shows that the CZM approach provides a more realistic idealization of fracture phenomena and a wider range of predictive capabilities.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Manufacturing
S. Abdel-Monsef, J. Renart, L. Carreras, P. Maimi, A. Turon
Summary: This study investigates the impact of environmental conditions on the cohesive law of composite bonded joints. An inverse method is used to extract the cohesive stress-separation relation from experimental results. The shape and parameters of the cohesive law vary under different ageing and test temperature conditions.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Computer Science, Interdisciplinary Applications
G. Guillamet, M. Rivero, M. Zavala-Ake, M. Vazquez, G. Houzeaux, S. Oller
Summary: This paper presents a novel parallel contact algorithm designed to run efficiently in High Performance Computing based supercomputers, with a focus on its computational implementation in a multiphysics finite element code. The algorithm tackles the contact problem between rigid and deformable bodies as a coupled problem, with a distinctive characteristic of handling the contacting bodies separately in a staggered way. Benchmark tests and a real impact test demonstrate the effectiveness and large-scale application capabilities of the proposed algorithm.
COMPUTERS & STRUCTURES
(2022)
Article
Engineering, Manufacturing
I. R. Cozar, F. Otero, P. Maimi, E. Gonzalez, S. Miot, A. Turon, P. P. Camanho
Summary: A new 3D elastoplastic damage model is proposed to predict the plastic deformation and progressive failure of composite materials. The model is validated through various tests and shows good agreement with experimental data.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Manufacturing
G. Guillamet, A. Quintanas-Corominas, M. Rivero, G. Houzeaux, M. Vazquez, A. Turon
Summary: This paper presents the application of the partial Dirichlet-Neumann contact algorithm to simulate low-velocity impact problems on composite structures using High-Performance Computing. The algorithm is designed for parallel finite element codes running on supercomputers and is extended to solve impact problems with damage. The parallel performance of the algorithm is evaluated on a mesh of 74M elements running with 2400 processors.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Mechanics
S. Abdel-Monsef, B. H. A. H. Tijs, J. Renart, A. Turon
Summary: This study proposes a new cohesive zone model description to overcome the limitations of existing models in the presence of a large fracture process zone. The new approach allows for convenient implementation of any arbitrary shape obtained experimentally.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
S. A. Medina, E. V. Gonzalez, N. Blanco, J. Pernas-Sanchez, J. A. Artero-Guerrero
Summary: Although there has been ongoing research into the rate-dependent behavior of interlaminar fracture toughness in fibre reinforced composites in recent decades, further investigation is necessary to characterize these properties and develop more reliable constitutive models for simulating dynamic events. In addition, there is currently no consensus on the appropriate test method for characterizing these properties. This paper introduces a new test method using a modified Double Cantilever Beam test with a guided tensile configuration, which ensures symmetric crack opening and pure mode I propagation during high loading rate testing.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Composites
Aravind Sasikumar, Albert Turon, Ivan R. Cozar, Oriol Vallmajo, Jorge Camacho Casero, Matthias De Lozzo, Said Abdel-Monsef
Summary: Aeronautical industries aim to generate efficient and cost-effective statistical design allowables for composite laminate responses. Accounting for uncertainties is crucial in this uncertainty quantification and management (UQ & M) framework to calculate design allowables, increasing confidence in the design and certification process. A global sensitivity analysis framework is established to identify material properties that influence laminate responses.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Materials Science, Composites
G. Guillamet, J. Costa, A. Turon, J. A. Mayugo
Summary: This paper presents a methodology for determining the quasi-isotropic ply sequence that is more resistant to delamination under off-axis uniaxial tension. The results show that the use of thin plies enlarges the design domain by up to 70% and generates a practically isotropic safe space. The methodology presented is also suitable for optimizing the delamination resistance of other load cases with stress singularities.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Mechanics
S. A. Medina, E. V. Gonzalez, N. Blanco, P. Maimi, J. Pernas-Sanchez, J. A. Artero-Guerrero, P. Hahn, M. May, E. de Blanpre, V. Jacques
Summary: The loading-rate mechanical response of mode I delamination in composites and adhesive bonded joints was investigated using the Guided Double Cantilever Beam test method. Three different data reduction methods were proposed and assessed: a displacement-based formulation, a near-crack-tip displacement formulation, and a numerical assessment using the Virtual Crack-Closure Technique method. These methods account for dynamic effects and show no rate-dependency higher than the uncertainty in materials and loading rates.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Polymer Science
D. Sanchez-Rodriguez, S. Zaidi, Y. Jahani, A. Ruiz de Luzuriaga, A. Rekondo, P. Maimi, J. Farjas, J. Costa
Summary: This work develops diagrams as a tool to determine curing and thermoforming parameters of vitrimers. Thermal analysis methods are used to evaluate the thermal stability of a disulfide containing epoxy. The curing and decomposition kinetics of the resin are characterized through a model-free kinetic method, generating an intuitive processability map. A similar chart for reprocessability is obtained, and criteria to determine the critical thickness are incorporated into the diagrams.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Chemistry, Physical
Daniel Campos, Pere Maimi, Alberto Martin
Summary: This study investigates the effects of different process parameters on the quality of manufactured parts using continuous manufacturing technology applied to thermoplastic composite materials. The findings suggest that careful control of process parameters is crucial to ensure the quality of the final product, and the models obtained can be used to predict thickness and consolidation levels during manufacturing. Further research is needed to optimize process parameters and study their effects on other thermoplastic composites.
Article
Engineering, Mechanical
A. Subramani, P. Maimi, J. M. Guerrero, J. Costa
Summary: This study investigates the impact of pseudo-ductile materials on notch sensitivity and behavior under different sizes using theoretical analysis and finite element models. The results show that pseudo-ductility can improve the nominal strength of notched specimens, but it decreases the stress concentration factor for smaller samples, regardless of the notch shape.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)