Article
Polymer Science
Enzo Maier, Moritz Lengmueller, Thomas Lohner
Summary: This study investigated the influence of fiber content and orientation in fiber-reinforced polymers on elastohydrodynamic lubrication of point contacts. The results showed that the combination of fiber content and orientation determines the shape, size, and film thickness of the contact, and the contact regime can change when a contact-specific stiffness threshold is reached.
Article
Materials Science, Composites
Bradley A. A. Newcomb
Summary: Vehicle mass can be reduced by using carbon fiber reinforced composites in the body structure. This study investigates the potential use of planar isotropic compression molded carbon fiber reinforced composites as primary energy absorbing structures in automobiles. The energy absorption behavior of different types of carbon fiber reinforced composites is studied through crush testing, and the results show that the length of the crush fixture support affects the failure mode and specific energy absorption of the composites. Elevated temperature testing reduces the specific energy absorption of one type of composite. Finally, the benefits of using a carbon fiber composite front end energy absorbing structure in terms of mass reduction are discussed.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Benjamin Groeger, David Roemisch, Martin Kraus, Juliane Troschitz, Rene Fuessel, Marion Merklein, Maik Gude
Summary: This paper presents research on a thermally supported multi-material clinching process for metal and thermoplastic composite sheets. An experimental setup is developed to investigate the flow pressing phenomena during joining. Computed tomography analysis is performed on the deformed specimens to examine the resulting inner material structure at different compaction levels. The material structure changes are characterized by sliding phenomena, crack initiation and growth.
Article
Polymer Science
Mohammad Amjadi, Ali Fatemi
Summary: This paper proposes a critical plane-based fatigue damage model for predicting tension-tension or tension-compression fatigue life of short glass fiber-reinforced thermoplastics, considering fiber orientation and mean stress effects. The model also includes temperature and frequency effects, and comparisons are made with experimental data to validate and analyze the model predictions.
Article
Materials Science, Multidisciplinary
J. Lalvohbika, S. S. Singh
Summary: The scattering of shear waves at an irregular interface between two different incompressible transversely isotropic fiber-reinforced half-spaces has been investigated. Reflected and transmitted quasi shear waves can exist in certain limit of propagation angle, which is associated with slowness. The expressions corresponding to the reflection and transmission coefficients are obtained by using Rayleigh's technique. These coefficients and energy ratios for irregular waves are computed numerically for a specific model, to validate the results. It is observed that these coefficients and ratios are functions of elastic constants, incidence angle, unit displacement vector, frequency, and corrugation parameters.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Polymer Science
Patrick Hirsch, Marianne John, Daniel Leipold, Andre Henkel, Sylvia Gipser, Ralf Schlimper, Matthias Zscheyge
Summary: The study investigated the anisotropic mechanical behavior of hybrid injection molded short and continuous fiber-reinforced thermoplastics and used numerical simulations to predict the resulting mechanical properties. The results showed that the flow rate during injection molding had a significant effect on fiber orientation but not on fiber length, leading to improved prediction of mechanical behavior under flexural loading. Using implemented injection molding data in the numerical simulation significantly reduced the deviation between predicted and experimentally measured flexural strength.
Article
Polymer Science
Quan Jiang, Tetsuo Takayama, Akihiro Nishioka
Summary: A mechanical model was developed to explain the impact strength of SGFRTP injection molded products using interfacial shear strength. The model showed good agreement with experimental results.
Article
Engineering, Geological
Yang Zhao, Ronaldo Borja
Summary: This paper introduces a double-yield-surface plasticity theory for transversely isotropic rocks, distinguishing between plastic deformation through the solid matrix and localized plasticity along weak bedding planes. The model is validated through triaxial compression tests and finite element simulations, showing accurate results in rock deformation surrounding a borehole subjected to fluid injection.
Article
Thermodynamics
Kapil Kumar Kalkal, Sunita Deswal, Ravinder Poonia
Summary: This study investigates the reflection of plane waves from the free surface of a rotating nonlocal, fiber-reinforced, transversely isotropic thermoelastic medium in the context of Lord-Shulman theory. Three coupled plane waves are observed to travel with distinct speeds in the medium. The amplitude ratios for the reflected waves are derived using appropriate boundary conditions and numerical computations are performed using MATLAB software. The graphical presentation of the modulus of amplitude ratios showcases the effects of fiber-reinforcement, nonlocality, and rotation parameters. The expressions of energy ratios are also derived and graphically portrayed as functions of angle of incidence. The phase velocities of plane waves in transversely isotropic medium depend on the incident angle, while in isotropic medium, they attain constant values. The energy conservation law is also justified during the reflection phenomena.
JOURNAL OF THERMAL STRESSES
(2023)
Article
Computer Science, Interdisciplinary Applications
Saeed Sabounchi, Ferhun C. Caner
Summary: In this study, a microplane model based on cylindrical geometry is developed for the analysis of three-dimensional inelastic fracturing of fiber reinforced polymer composites. The model successfully bridges the behavior at the mesoscale and macroscale, and offers a much lower computational cost compared to competing models. The calibration and comparison with test data demonstrate the predictive capacity of the model.
COMPUTERS & STRUCTURES
(2022)
Article
Automation & Control Systems
Christoph Zirngibl, Benjamin Schleich, Sandro Wartzack
Summary: This paper investigates the systematic improvement of clinch joint characteristics and considers the uncertainties, proposing a novel method for the robust estimation of clinch joint properties.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Construction & Building Technology
Hongseok Jang, Segwan Seo, Daesung Cho
Summary: This study assessed the compressive and tensile strengths and modulus of elasticity of waste PET using ASTM standard tests. It found that waste PET has higher tensile strength and lower unit weight compared to concrete, making it a potential material for foundation piles, especially when short reinforcing fibers are used and UV degradation is avoided.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Mechanics
M. J. Lewandowski-Szewczyk, B. Grzeszykowski, M. D. Gajewski
Summary: Linear viscoelasticity is still a valuable model in engineering for studying the behavior of materials under different loading rates. Some materials, such as fiber reinforced composites, asphalt concrete mixtures and wood, exhibit anisotropic behavior. While experimental tests can reveal the dependence of engineering constants on loading velocity, modeling the relationship between strain and stress is more challenging due to the nonlinearity of the stiffness tensor components. However, several models have been proposed to address this issue and in this paper, a linear viscoelastic model for anisotropic materials based on the spectral decomposition of the stiffness tensor is presented.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Vanessa Kwiatkowski, Matthieu Le Saux, Vincent Le Saux, Sylvain Leclercq, Yann Marco
Summary: This paper introduces an experimental protocol for well-controlled cyclic compression tests without anti-buckling devices and checks the uniaxiality of the global loading using kinematic and thermoelastic coupling field measurements. Then, it compares the results from fatigue and heat buildup tests for polyetheretherketone reinforced with short carbon fibers under different load ratios, showing that the fatigue lifetime is higher in compression and depends on the compression load ratio. The heat buildup approach is found to be a relevant method to quickly predict the fatigue lifetime of the material.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Geological
Yang Li, Zhi Yong Ai
Summary: This study investigates the horizontal transient response of partially embedded pile groups in multilayered transversely isotropic soils using the FEM and compares the results with existing literature. Numerical examples are provided to explore how various factors such as free-standing length, pile-soil stiffness ratio, pile spacing ratio, soil's transverse isotropy, and stratification affect the horizontal transient response of partially embedded pile groups.
Article
Materials Science, Multidisciplinary
T. Guillen-Hernandez, J. Reinoso, M. Paggi
Summary: The phase field approach is a promising modeling tool for fracture, and this paper presents a phase field formulation for triggering brittle fracture in shell structures made of functionally graded materials. The model incorporates a solid shell kinematic description and uses the Enhanced Assumed Strain and Assumed Natural Strain methods to alleviate locking pathologies. The corresponding multi-field variational formalism is derived and discretized within the context of the Finite Element Method.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
A. R. Dusane, P. R. Budarapu, A. K. Pradhan, S. Natarajan, J. Reinoso, M. Paggi
Summary: The delamination and cracking of matrix/fiber in fiber reinforced composite materials is a common failure phenomena, which requires designs with large damage tolerance and superior fracture resistance. The use of Cohesive Zone Models and Phase Field approach to study fracture phenomena in composite structures allows for accurate simulation of complex crack paths and mechanics.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
M. R. Marulli, A. Valverde-Gonzalez, A. Quintanas-Corominas, M. Paggi, J. Reinoso
Summary: The present study focuses on the analysis of failure mechanisms in thin layer flexible substrate systems, such as crack propagation, delamination, and mixed-mode mechanisms. The phase-field approach and the cohesive zone model are used to simulate the mechanical response and crack propagation mechanisms. The study demonstrates the capabilities of these methods through tests.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(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
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
Materials Science, Composites
Shada Bennbaia, Elsadig Mahdi, Galal Abdella, Aamir Dean
Summary: This paper presents the design and experimental analysis of a 3D-printed composite-plastic hybrid light structure as a collapsible energy absorber for the automobile bumper system. Low-impact tests were conducted to investigate the failure mechanism and energy absorption capacity of a spiral structure. The study concluded that the thermoplastic-foam composite with nine spirals (diameter = 0.97 cm) yielded the best results, demonstrating high energy absorption capacity and a controlled and progressive failure mechanism.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Engineering, Mechanical
Abdelrahman Mohamed Ragab, Elsadig Mahdi, Kas Oosterhuis, Aamir Dean, John-John Cabibihan
Summary: 3D printing technology is used to quickly manufacture small structures in building construction. The paper proposes a parametric Voronoi tessellations model to generate and fabricate 3D-printed hexagonal honeycomb partitions for interior design. Comprehensive experimental testing was conducted to characterize the mechanical properties and investigate the energy absorption characteristics of the proposed 3D-printed hexagonal honeycomb.
FRONTIERS IN MECHANICAL ENGINEERING-SWITZERLAND
(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
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)
