Article
Engineering, Mechanical
M. T. Aranda, J. Reinoso, I. G. Garcia
Summary: This work experimentally analyzes the influence of printing direction on the fracture resistance of composite specimens and finds that structured interfaces printed in the vertical direction exhibit higher fracture toughness compared to those printed in the horizontal direction.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
A. Wagih, R. Tao, G. Lubineau
Summary: A novel adhesive joint mimicking biological systems like gecko and mytilus californianus was designed, incorporating sacrificial cracks to increase interlaminar fracture toughness through new dissipative mechanisms. Unlike classical joints experiencing interfacial failure, the bio-inspired joints feature crack bifurcation between both sides of the bondline. The effectiveness of the adhesive toughening effect can be influenced by properties such as adhesive strength and failure strain.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Characterization & Testing
Chenglin Han, Hongxing Zhao, Tianzhi Yang, Xueqing Liu, Mingchi Yu, Gong-Dong Wang
Summary: This study utilizes machine learning to build a fast and accurate predictive model, assessing the extent to which key features affect performance and providing ideas for designing new materials and improving efficiency.
Article
Materials Science, Composites
Kanokporn Tangthana-umrung, Matthieu Gresil
Summary: Healable and recyclable fibre reinforced vitrimer composites have been developed, which exhibit superior mechanical and interlaminar fracture properties. The findings reveal the potential for further development of vitrimer CFRP composites for advanced applications.
COMPOSITES COMMUNICATIONS
(2022)
Article
Engineering, Multidisciplinary
Jiahe Ma, Qiang Xu, Weidong Zhu, Yinglin Ke
Summary: This study introduces a low-cost and high-performance reinforcement method for CFRP products. By using a translaminar enveloping technique, interlocking and binding actions are introduced into conventional lay-ups. Experimental results show significant improvements in fracture toughness in both mode I and mode II. The study also reveals the evolution of interlaminar toughening behaviors.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Composites
Nicola Vallack, Prasad Potluri, William W. Sampson
Summary: A systematic investigation was conducted to study the influence of nonwoven veils made from different fiber types on the Interlaminar Fracture Toughness (IFT) of carbon/epoxy composites. The IFT increased to a plateau above a mean coverage of about 3 for veils with various areal densities and coverage. The effect of fiber type on IFT varied depending on the mode of loading, with polymer fibers showing higher increases than inorganic fibers for mode I, while the increase in IFT for mode II was broadly insensitive to fiber type. SEM fractography revealed highly curled veil fibers in the polymer veil interleaves that significantly increased IFT, indicating a significant energy absorbing mechanism.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Min Li, Zhe Che, Shaokai Wang, Yubo Zhou, Hao Fu, Yizhuo Gu, Wei Zhang
Summary: By implanting fine z-pins on the in-plane fibers, the interlaminar fracture toughness of carbon fiber reinforced polymer (CFRP) composites can be significantly improved, while maintaining high retentions of in-plane mechanical properties. The mechanical properties of the carbon fiber pins play a crucial role in enhancing the composite laminate.
MATERIALS & DESIGN
(2021)
Article
Engineering, Manufacturing
Yunfu Ou, Longqiang Wu, Meir Hefetz, Carlos Gonzalez, Juan Jose Vilatela
Summary: This study presents a method for fabricating carbon nanotube fibre veils on woven carbon fibre/epoxy composite laminates and investigates the effects of interleaf thickness and degree of infiltration on interlaminar properties. The interlaminar fracture toughness under different loading conditions is analyzed, and the failure and toughening mechanisms are systematically studied. The experimental results show that the toughening effects of CNT veils depend on their thickness and degree of resin infiltration, observed by electron microscopy and Raman spectroscopy. The mode I interlaminar fracture toughness increases with increasing CNT veil thickness up to 10 μm, but decreases at 15 μm, while the mode II fracture toughness improves with increasing thickness of CNT veils. The figure of merit for interlaminar reinforcement is significantly high at 58.5, surpassing the current state-of-the-art.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Mechanical
Sage Fulco, Michal K. Budzik, Erich D. Bain, Kevin T. Turner
Summary: We investigate the elastic-plastic fracture of architected materials and find that load sharing and toughness can be controlled by changing the spatial distribution and height of pillars. We present a simple relation to relate the plastic fracture process zone to the pillar array structure and toughness. This relation allows for quantitative prediction of failure loads and reveals that strength and toughness can be decoupled through architecture, providing a foundation for the design of architected materials with enhanced fracture toughness.
EXTREME MECHANICS LETTERS
(2022)
Article
Materials Science, Composites
Tony Wente, Xinyu Mao, Danielle Zeng, Homa Torab, Jeff Dahl, Xinran Xiao
Summary: Fiber reinforced composite materials are highly sought after for their high specific strength and stiffness in lightweighting components for next generation vehicles. However, weaknesses in interlaminar strength and delamination issues are often present. Quasi-3D (Q3D) braided composites aim to address these issues by physically connecting plies through fiber tows, resulting in higher interlaminar strength. Studies on UD and Q3D carbon composites were conducted to assess their in-plane isotropy, with Mode I and Mode II interlaminar fracture toughness tests performed on the samples.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Engineering, Manufacturing
Zhen Wang, Yan Li, Haoyun Tu
Summary: In this study, repeatable self-healing carbon-epoxy composites were manufactured by adjusting the parameters of microcapsules and resin, achieving continuous healing at the same location and significantly improving the fracture toughness of the material.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Mechanics
C. Kostagiannakopoulou, T. H. Loutas, G. Sotiriadis, V Kostopoulos
Summary: This research paper investigates the impact of aspect ratio and specific surface area of Graphene Nano-Platelets on the interlaminar fracture behavior of carbon fiber-reinforced polymer composites. The study found that GNPs with higher aspect ratios and specific surface areas lead to improved interlaminar fracture toughness under both Mode I and Mode II loading compared to unmodified composites.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Manufacturing
Mohanad Idrees, Giuseppe R. Palmese, Nicolas J. Alvarez
Summary: Interleaving is an effective method to improve delamination resistance in composites. However, there is a lack of design rules for the choice of resin in interleaving. While previous studies suggest that any resin can be used, our research shows that the choice of resin is critical for translating toughness properties.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Sheng Wang, Mehmet Cagatay Akbolat, Oguzcan Inal, Kali Babu Katnam, Zhenmin Zou, Prasad Potluri, James Taylor
Summary: This study investigates the effect of short micro-fibre-based veils on the fracture energies and R-curves of composite laminates, with a focus on the role of veil binders. The results show that the binders used in the manufacturing of veils have a considerable impact on fracture energy, crack path, and R-curve behavior, with a more pronounced effect in the laminates with carbon veils.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Mechanical
Natassia Lona Batista, Konstantinos Anagnostopoulos, Edson Cocchieri Botelho, Hyonny Kim
Summary: This study evaluated the influence of different degrees of crystallinity on PPS/carbon fiber composites processed by hot compression molding, showing that composite samples processed with lower cooling rates exhibit better mechanical properties. The mode-II fracture toughness is strongly dependent on the degree of crystallinity of the thermoplastic matrix, with lower cooling rates yielding stronger interfacial bonds.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
M. Munoz-Reja, V. Mantic, L. Tavara
Summary: In this study, the CCFFM is used to predict crack onset or growth on a linear elastic interface. Two approaches of the CCFFM, the widely used method based on stress and energy criteria curves and the novel PMTE-SC, are compared. It is found that the PMTE-SC is equivalent to the classical formulation of the CCFFM, providing the same predictions for crack onset and propagation. The PMTE-SC offers versatility and the ability to handle complex configurations with multiple cracks.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
J. Canas, A. Blazquez, A. Estefani, L. Tavara
Summary: This paper discusses several models for analyzing peeling tests, and finds that traditional beam models including an elastic interface fail to correctly represent the mixity at the crack tip for small thickness ratios. By studying the problem within the framework of Fracture Mechanics, new interface stiffness models are proposed that accurately depict the mixed-mode conditions at the crack tip and the load versus displacement evolution for various thickness ratios.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Pavan Kumar Asur Vijaya Kumar, Aamir Dean, Jose Reinoso, Marco Paggi
Summary: This passage reviews the research on fracture phenomena of thin-walled structures in recent decades, introduces the development of a thermodynamically consistent framework for thin-walled structures under the influence of temperature, and the method of using fully-integrated solid shell finite elements for coupled thermo-mechanical phase-field modeling.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mathematics, Applied
Pavan Kumar Asur Vijaya Kumar, Aamir Dean, Shahab Sahraee, Jose Reinoso, Marco Paggi
Summary: This work proposes a thermodynamically consistent framework for coupled thermo-mechanical simulations in thin-walled structures with cohesive interfaces, utilizing solid shell parametrization and locking-free thermo-mechanical solid shell elements. It also extends the interface finite element for geometrical nonlinearities to model thermo-mechanical decohesion events, with computational implementation in ABAQUS. The predictability of the model is demonstrated through several representative examples.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2022)
Article
Chemistry, Physical
A. Valverde-Gonzalez, E. Martinez-Paneda, A. Quintanas-Corominas, J. Reinoso, M. Paggi
Summary: This article presents a combined phase field and cohesive zone formulation for hydrogen embrittlement in metals, which resolves the polycrystalline microstructure. The model takes into account the hydrogen-microstructure interactions and explicitly captures the interplay between bulk fracture and intergranular fracture. Simulations in relevant case studies show the potential of the theoretical and computational formulation in capturing inter- and trans-granular cracking.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
A. Valverde-Gonzalez, J. Reinoso, N. K. Jha, J. Merodio, M. Paggi
Summary: In this investigation, the mechanical modeling of nonlinear visco-hyperelastic residually stressed materials is combined with the phase field approach to fracture. The phase field method is extended to simulate pre-stressed cylindrical structures subjected to axial pulling load upon failure. The results show that the mechanical behavior and crack pattern of these structures depend on viscous parameters, displacement rate, and strength of the residual stress field, as well as geometrical characteristics of the cylindrical structure.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Civil
Pavan Kumar Asur Vijaya Kumar, Aamir Dean, Jose Reinoso, Marco Paggi
Summary: This paper proposes a thermodynamically consistent framework for solving the coupled thermo-mechanical phase-field fracture problem in thin-walled structures made of functionally graded materials (FGMs). The computational model combines Enhanced Assumed Strain (EAS) and Assumed Natural Strains (ANS) to alleviate locking pathologies in the solid shell formulation. Benchmark examples are used to assess the model capabilities and demonstrate the importance of functionally graded materials in crack deflection and temperature distributions.
THIN-WALLED STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Z. Liu, J. Reinoso, M. Paggi
Summary: A three-dimensional hygro-thermo-mechanical computational framework for photovoltaic laminates has been established and successfully implemented in this study. The method takes into account the thermal properties in thin-walled structures and the characteristics of polymeric interfaces, showing efficiency and reliability.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mathematics, Interdisciplinary Applications
A. Valverde-Gonzalez, J. Reinoso, B. Dortdivanlioglu, M. Paggi
Summary: Soft materials with high deformability and susceptibility to damage events are extensively studied for applications in biomechanics. This study proposes gradient-enhanced continuum damage schemes to model the damage evolution processes in these nonlinear materials that are prone to locking issues. The novel formulations of mixed displacement-enhanced assumed strain and mixed displacement-pressure-Jacobian are derived and successfully implemented, providing satisfactory agreement with ABAQUS built-in elements. Multiple numerical applications demonstrate the effectiveness of these formulations in handling shear and volumetric locking and simulating damage phenomena.
COMPUTATIONAL MECHANICS
(2023)
Article
Mechanics
L. Tavara, C. Madrigal, M. T. Aranda, J. Justo
Summary: This study experimentally analyzes the effects of ageing and anisotropy on 3D-printed composites with short carbon fibres embedded in a polyamide matrix. The results show that anisotropy induced by the FDM procedure influences the material properties, with different infill configurations exhibiting varied mechanical behaviors. Furthermore, the hygrothermal properties associated with the matrix are retained in the 3D-printed composite parts, leading to an observed ageing effect even under standard environmental conditions.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
M. R. Marulli, J. Bonari, J. Reinoso, M. Paggi
Summary: Indentation tests are widely used to characterize the mechanical and fracture properties of materials. This study proposes an efficient theoretical and computational framework to simulate indentation-induced cracking phenomena caused by non-conforming contacts with arbitrary-shaped indenters. The framework combines MPJR interface finite elements and a phase-field model for crack evolution. Numerical predictions successfully capture the effects of surface roughness on crack initiation and radius.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
J. C. Marin, J. Justo
Summary: Determining failure strains is crucial for the design of composite structures. Tensile tests were conducted to evaluate the ultimate strains of a composite with various fiber orientations. The obtained ultimate tensile strengths exhibited low or moderate dispersion, with the average values providing a good estimation of failure stress. However, failure strains showed high dispersion for almost all orientations, indicating the need to use the minimum value as the failure strain threshold. Additionally, the shear behavior of the material was assessed.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Alejandro Estefani, Luis Tavara
Summary: The present investigation aims to develop a numerical model that can accurately represent the impact of various variables on the mechanical behavior of 3D printed parts using the fused deposition modeling (FDM) process. The study focuses on analyzing the effect of raster angle/toolpath and the internal microstructure of the deposited filaments on the properties of the parts. The results show that anisotropic properties of the filament must be taken into account, even when quasi-isotropic printing parameters are used (cross-ply configurations).
ENGINEERING REPORTS
(2023)
Article
Engineering, Civil
Pavan Kumar Asur Vujaya Kumar, Aamir Dean, Jose Reinoso, Marco Paggi
Summary: A thermodynamically consistent framework is proposed to solve the coupled thermo-mechanical phase-field fracture problem in thin-walled structures made of functionally graded materials. The model's capabilities are assessed through benchmark examples, highlighting the importance of technological solutions with multiple FGM phases.
THIN-WALLED STRUCTURES
(2022)
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)
