Article
Materials Science, Multidisciplinary
Kunlong Wei, Hongbin Shi, Jiang Li, Min Tang
Summary: A new progressive damage model for 3 D woven C/C composites is developed at fiber-matrix level using micromechanics method, successfully predicting stress-strain response and considering the effect of manufacturing void defects. The model accounts for damage behavior at the fiber-matrix level and accurately reproduces experimental results.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2022)
Article
Engineering, Manufacturing
S. Z. H. Shah, P. S. M. Megat-Yusoff, S. Karuppanan, R. S. Choudhry, Z. Sajid
Summary: This study introduces a multiscale progressive damage modelling methodology for 3D woven composites, which accurately simulates the damage response. The model combines global analysis with local damage response and has been validated through experiments on different composite materials to demonstrate its accuracy and efficiency.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Wenhong Ao, Weimin Zhuang, Bobin Xing, Qing Zhou, Yong Xia
Summary: A novel three-dimensional damage model based on continuum damage mechanics is established for the analysis of damage and fracture in woven carbon fibre reinforced plastic laminates. The model accurately predicts the initiation and propagation of intralaminar damage and simulates the delamination induced by interlaminar cracks. Experimental results show that the model's predictions are within 5% of the actual results, demonstrating its accuracy and suitability for damage simulations in woven CFRP laminates with different ply orientations under low velocity impact.
MATERIALS & DESIGN
(2022)
Article
Mechanics
Hui Zhang, Jing Sun, Xiaobo Rui, Si Liu
Summary: This research focuses on developing a method for detecting and imaging delamination damage in CFRP composite laminate structures. The traditional guided wave detection methods rely on the reflected wave signal at the defect, but delamination damage often produces weak reflected wave signals compared to surface damage. The proposed method uses full-wavefield data and enhances sensitive modes in order to visualize the morphology of delamination. The method is validated through simulations and experiments.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Shijia Xu, Shuai He, Jiayi Li, Beiyao Xiao, Wei Zhang
Summary: This study tested the quasi-static tension behavior of high-strength glass fiber four-Harness stain woven composite, Kevlar fiber plain woven composite, and their laminated hybrid composite. Representative volume element models were established based on mesoscopic cross-section photographs combined with voxel mesh. A progressive damage model was proposed to predict the damage initiation and evolution of the 2D woven composites, considering the crimping effect of plain-woven composites.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Khodijah Kholish Rumayshah, Hermawan Judawisastra, Satrio Wicaksono, Tatacipta Dirgantara
Summary: A simplified approach for micromechanical modeling of fiber-reinforced polymer composites is proposed. The method involves subjecting a hexagonal unit cell to four loading conditions and random distribution of unit cell properties with different fiber fractions in homogenized unit cells. The results show good agreement between the predicted and experimental transverse tensile stiffness and strength of the composite, while requiring significantly less computational cost compared to classical models.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Chao Hang, Hao Cui, Huifang Liu, Tao Suo
Summary: This study presents a micro/meso-scale analysis framework to investigate the deformation and failure of a 2.5D woven composite under tensile loading. It predicts the elasticity and strength of fiber bundles, considering the effects of fiber undulation and in-situ factors. The research also explores the influence of shear coupling coefficient in the failure criterion on the mechanical response.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Physical
Lihua Lyu, Fangfang Wen, Tingting Lyu, Xinghai Zhou, Yuan Gao
Summary: To improve the interfacial properties, 3D orthogonal woven fabrics made of basalt filament yarns were modified with carboxylated carbon nanotubes (KH570-MWCNTs) and polydopamine (PDA). The modified fabrics showed enhanced bending properties, with maximum bending loads increased by 31.5% and 31.0%. Finite element analysis and experimental testing confirmed the accuracy of the simulation results, demonstrating the material's damage situation and mechanism during the bending process.
Article
Mechanics
An Le, Sanjay Nimbalkar, Navid Zobeiry, Sardar Malek
Summary: This paper investigates the bending response of cured and uncured viscoelastic composite laminates at different loading rates using a three-dimensional multi-scale modelling framework. The study aims to understand the effect of fibre waviness on wrinkling evolution during the forming process of advanced composites. The results show that the proposed multi-scale modelling framework is effective in predicting the behaviour of viscoelastic composites with various yarn architectures.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Manufacturing
Tao Zheng, Licheng Guo, Ruijian Sun, Zhixing Li, Hongjun Yu
Summary: This paper investigates the compressive damage mechanisms of 3D woven composites through a coupled numerical-experimental approach, and develops a comprehensive progressive damage model capable of characterizing damage accumulations. The influence of inhomogeneous fiber initial misalignments on compressive performances is parametrically investigated, and the proposed model is validated through corresponding experiments.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Mechanics
Carolyn Oddy, Magnus Ekh, Martin Fagerstrom
Summary: There is a growing demand for lightweight materials with improved performance and reduced manufacturing costs in various industries. This study proposes a macroscopic model to predict the material response of a 3D glass fiber reinforced epoxy material system, capturing experimentally observed inelastic strains and stiffness reductions. The model is general, thermodynamically consistent, and allows for modular addition and calibration of various non-linear phenomena depending on loading direction.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Polymer Science
Xingzhong Gao, Tiancong Han, Bolin Tang, Jie Yi, Miao Cao
Summary: The thermo-oxidative stability of carbon fiber polymer matrix composites with different integral reinforced structures was investigated through experimental and numerical methods. The study found that thermal oxidative ageing led to the degradation of the matrix and the fiber/matrix interface, and the interface cracks were sensitive to the reinforced structure.
Article
Mechanics
Hemanth Thandaga Nagaraju, Bhavani Sankar, Nam-Ho Kim, Ghatu Subhash
Summary: It is easier to generate finite element meshes of complicated geometries using voxel-based meshes compared to conformal meshes. However, voxel-based meshes tend to have higher local stresses due to artificial stress concentration caused by jagged lines approximating a curve. In this study, we propose a method that addresses this issue and accurately predicts the maximum von Mises stress in voxel-based meshes. The method is based on the variation of reciprocal of stresses and associated numerical gradient. We compare the prediction of the proposed method with results from a conformal mesh and verify its accuracy using different mesh densities, material properties, and integration schemes.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Wei-Zhi Huang, Bo Li, Xi-Qiao Feng
Summary: This study establishes a micromechanical method to theoretically predict the effective surface elastic moduli of solid materials covered with surface microstructures. This is important for analyzing the mechanical properties of miniature devices and structures and for designing advanced functional materials.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Civil
Behzad Kazemianfar, Mohammad Rahim Nami
Summary: The study aimed to compare the mechanical performance of 3D woven composites and 2D composites under oblique low velocity impact. Experimental and simulation results showed that the mechanical superiority of 3D composites decreases as impact angle increases, with changes in factors such as absorbed energy and damage parameters.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Rex Bedzra, Stefanie Reese, Jaan-Willem Simon
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Mechanics
Rex Bedzra, Stefanie Reese, Jaan-Willem Simon
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Engineering, Mechanical
Hagen Holthusen, Tim Brepols, Stefanie Reese, Jaan-Willem Simon
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2020)
Review
Computer Science, Interdisciplinary Applications
Jaan-Willem Simon
Summary: This paper provides a systematic review of numerical approaches and results published in recent years regarding the material behavior of paper and paperboard. It focuses on recent trends, achievements, as well as challenges and open questions in computational modeling of these materials.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2021)
Article
Engineering, Chemical
Benjamin Schaaf, Carl Richter, Markus Feldmann, Elisabeth Toups, Jaan Simon, Stefanie Reese, Robert Seewald, Alexander Schiebahn, Uwe Reisgen
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2020)
Article
Materials Science, Multidisciplinary
S. Felder, N. A. Vu, S. Reese, J-W Simon
MECHANICS OF MATERIALS
(2020)
Article
Polymer Science
Sabin Adhikari, Christopher J. Durning, Jacob Fish, Jaan-Willem Simon, Sanat K. Kumar
Summary: Thermal welding involves heating polymeric surfaces above their melting point to join two layers. The interpenetration thickness between the layers is primarily controlled by the crystallization process, and a lower bulk temperature results in a thinner interface. These findings are important for understanding the mechanism of thermal welding and improving welding techniques.
Article
Materials Science, Multidisciplinary
Hagen Holthusen, Tim Brepols, Stefanie Reese, Jaan-Willem Simon
Summary: The objective of this paper is to develop a thermodynamically consistent coupled damage-plasticity model that accounts for damage anisotropy at large deformations. The model treats plasticity and damage as separate dissipative mechanisms and is suitable for both brittle and ductile materials. The logarithmic strain measures and the additive split are used in the deformation analysis, while a novel gradient extension is introduced to address mesh sensitivity in material softening.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mechanics
Jaan-Willem Simon
Summary: This paper discusses the implications of using unrestricted hardening in lower bound shakedown analysis, highlighting the problem of using a two-surface model in scenarios involving limited kinematic hardening.
MECHANICS RESEARCH COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Zhiyong Zhao, Chuang Liu, Haojun Wang, Jaan-Willem Simon, Junbiao Wang, Yujun Li
Summary: This paper investigated the initial yield behavior of curved honeycombs under combined shear-compression loads, considering the effects of curvature, loading angle, and honeycomb thickness. The study used a detailed finite element model and experimental verification to analyze the mechanical response and deformation mechanism of curved honeycombs. The results showed that curvature had a significant effect on the crushing response, while the loading angle had a more pronounced effect for larger angles. The study proposed a macroscopic yield criterion and an inverse parameter identification approach for curved honeycombs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Lukas Poggenpohl, Hagen Holthusen, Jaan-Willem Simon
Summary: A new failure zone averaging scheme at finite strains is proposed in this study, which is applicable in the softening regime for homogenization. Numerical simulations and verification show that the proposed scheme yields size-independent stress-strain relations even after localized damage has occurred leading to strain softening within the RUCs.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Mechanics
Lukas Poggenpohl, Hagen Holthusen, Jaan-Willem Simon
Summary: In this paper, the failure zone homogenization approach is applied to shear and mixed mode loading of long fiber reinforced plastics. A scalar damage model with gradient enhancement is used to accurately describe material failure within the epoxy matrix. Statistical analysis of different RUC sizes with random micro structures is performed, and the influence of crack closure effects and different loading conditions is analyzed.
COMPOSITE STRUCTURES
(2022)
Article
Plant Sciences
Domen Macek, Hagen Holthusen, Annabell Rjosk, Stephan Ritzert, Thea Lautenschlaeger, Christoph Neinhuis, Jaan-Willem Simon, Stefanie Reese
Summary: In this study, the anatomy and mechanical properties of Stephania japonica leaves are investigated through displacement driven tensile tests, compression tests, light microscopy, and X-ray tomography. The experiments reveal a viscoelastic behavior and a matrix material reinforced by fibers. A continuum mechanical anisotropic viscoelastic material model is proposed to describe this behavior.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Engineering, Multidisciplinary
Birte Boes, Jaan-Willem Simon, Stefanie Reese, Hagen Holthusen
Summary: This paper presents a novel continuum mechanical framework for decoupling the material behavior in in-plane and thickness directions, inspired by the macroscopic behavior of paper and paperboard. The aim is to derive a thermodynamically consistent framework that captures the in-plane and out-of-plane decoupling for large deformations. The framework splits the deformation tensor into in-plane and out-of-plane deformations and formulates the Helmholtz free energy separately, allowing for easy modification and extension to inelasticity. Structural examples demonstrate the decoupling of the in-plane and out-of-plane response. The presented model is a flexible constitutive framework for decoupled material responses.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Construction & Building Technology
B. Schaaf, B. Abeln, C. Richter, M. Feldmann, E. Toups, J. Simon, S. Reese, R. Seewald, A. Schiebahn, U. Reisgen
Summary: This paper discusses the use of silicone adhesive bonding in glass construction, highlighting the restrictions from authorities and the design guidelines specified in the European Technical Approval Guideline 002. It also examines the use of finite element calculations for design and the challenges in determining material parameters, as well as introducing a newly developed material model.
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)