Article
Mechanics
S. L. J. Millen, Z. Ullah, B. G. Falzon
Summary: The finite element mesh aligned along the fibre direction is crucial in predicting damage accurately, especially in the presence of cracks. However, when matrix crack paths are not established a priori or may not be the dominant damage mode, fibre mesh alignment is unnecessary.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Sota Onodera, Koki Kawahara, Shigeki Yashiro
Summary: This study develops a ply-by-ply shell layer model to investigate the mechanical effects of gaps in composite laminates caused by the low position accuracy of the robot arm in automated fiber placement manufacturing. By modeling the gaps and hole independently of the mesh using XFEM and using a simple square mesh to reduce computational costs, this study achieves good prediction results.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Manufacturing
Min-Gu Han, Seung-Hwan Chang
Summary: The compressive characteristics of egg-box energy-absorbing cores composed of plain-weave carbon/epoxy composites were analyzed via finite-element analysis and experimentally validated. The simulation technique successfully predicted the crushing behavior of the egg-box energy-absorbing core, and the corresponding failure mode under compression was estimated successfully.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Composites
Scott L. J. Millen, Juhyeong Lee
Summary: In this study, 3D finite element simulations were conducted to investigate the effects of lightning strikes on the microscale behavior of continuous fiber-reinforced composite materials. The study aimed to predict and understand complex lightning damage mechanisms at a fundamental level. Micromechanical representative volume element (RVE) models were used to simulate the behavior of a UD composite laminate.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Smojver Ivica, Ivancevic Darko, BrezetiC Dominik, Haramina Tatjana
Summary: This work presents a constitutive model for an intrinsically self-healing composite matrix material. The model combines micro-damage initiation and evolution models, healing evolution model, and von Mises linear isotropic hardening plasticity. It has been validated using experimental results and can accurately predict material behavior and the accumulation of plastic strain.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2022)
Article
Mechanics
Mohammad Alhawamdeh, Omar Alajarmeh, Thiru Aravinthan, Tristan Shelley, Peter Schubel, Ali Mohammad, Xuesen Zeng
Summary: This paper proposes a design tool that combines experimental and numerical methods to investigate the failure modes of hollow PFRP profiles under four-point bending. The validated finite element model was used to thoroughly study the failure sequence and conduct a comprehensive parametric study on design parameters.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Johannes Reiner
Summary: This paper presents a generic strategy to generate macroscopic continuum damage models using non-local averaging, and calibrates the model with experimental data for specific carbon fiber-reinforced composites. The results show that non-local modeling enables more realistic simulation of damage, and suggest choosing a small enough averaging radius to avoid significant increase in computational cost.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Yun-Fei Fu, Johannes Reiner
Summary: This paper presents a systemic calibration methodology for efficiently simulating progressive damage evolution in four different pultruded GFRP composites. The results show that the best set of input parameters can yield accurate crack length predictions, and the incorporation of bi-linear softening laws improves simulation results.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Gisele G. Cintra, Janine D. Vieira, Daniel C. T. Cardoso, Thomas Keller
Summary: This paper investigates the interlaminar fracture of pultruded glass fiber-polymer structural members and proposes a testing methodology. The results show that the Modified Beam Theory method performs the best for crack propagation in Mode I, while the Corrected beam theory using effective crack length and the Experimental compliance method yield differences lower than 1% from experiments in Mode II.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Johannes Reiner
Summary: Data-driven calibration techniques using theory-guided feed-forward neural networks have been developed to find suitable input parameters for finite element simulation of progressive damage in fibre-reinforced composites. The calibrated material models can simulate the structural response with a maximum error of 9% compared to experimental measurements. The models also enable virtual analysis of size effects and accurate force simulations in quasi-isotropic laminates under impact loading.
INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS
(2023)
Article
Construction & Building Technology
Satheeskumar Navaratnam, Deighton Widdowfield Small, Marco Corradi, Perampalam Gatheeshgar, Keerthan Poologanathan, Craig Higgins
Summary: This study aims to evaluate the performance of timber beams reinforced with GFRP pultruded beams under flexure, and develop a corresponding finite element model. The experimental results demonstrate that grain deviation significantly reduces the strength of unreinforced timber beams, but has minimal effect on GFRP-reinforced timber beams.
Article
Engineering, Mechanical
Gustavo Giordani, Fernando Soares, Ignacio Iturrioz
Summary: The challenge of simulating the damage process in both ductile and quasi-fragile materials has led to the development and success of the discrete element method. This approach allows for a natural transition between continuum and cracked regions. Validation of the numerical method is done with fissures introduced in a lattice structure, and the performance of the approach in quantifying damage is discussed in the context of quasi-brittle materials.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Sadjad Naderi, Mingzhong Zhang
Summary: This paper presents a novel meso-scale modelling framework to investigate the fracture process in steel fibre reinforced concrete under uniaxial tension and compression. The study considers the 3D mesostructural characteristics of the SFRC, including different types of fibres, realistic shaped aggregates, mortar, interfacial transition zone, and voids. The results show that straight and hooked-end fibres significantly improve the compressive damage tolerances of concrete while spiral fibres have a negligible effect. The tensile macro-damage level index is reduced by all fibres, with the higher anchoring capacity of spiral fibres reducing the reinforcement performance.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Johannes Reiner, Sergio Orellana Pizarro, Kenny Hadi, Darren Narain, Peng Zhang, Matt Jennings, Mahbube Subhani
Summary: This study investigates the mechanical properties of thin quasi-isotropic [90°-45°-0°-45°] beech veneer laminates. The results show that beech veneer laminates can be tested and analyzed similarly to fiber-reinforced laminates, with consistent values of strength and damage resistance. However, the modulus, tensile strength, open-hole strength, and translaminar fracture energy of beech veneer laminates are one order of magnitude lower compared to fiber-reinforced polymer composites.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Construction & Building Technology
Chuntao Zhang, Yu Chen, Mei Dou
Summary: In this study, axial compression tests were conducted on slender BFRP tubes to evaluate their compression characteristics as compression members. The results indicated that BFRP tubes exhibited three distinct failure modes, namely local failure, critical failure, and buckling failure. Two three-stage theoretical models for BFRP tubes were developed through experimental data analysis, which successfully predicted the stress-strain curves and the load-lateral deflection curves.
Article
Mechanics
TianQiao Liu, Jia-Qi Yang, Peng Feng, Kent A. Harries
COMPOSITE STRUCTURES
(2020)
Article
Construction & Building Technology
Yusuf Akinbade, Kent A. Harries, Bhavna Sharma, Michael H. Ramage
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Forestry
Christian Gauss, Kent A. Harries, Marzieh Kadivar, Yusuf Akinbade, Holmer Savastano
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2020)
Article
Engineering, Civil
Yubing Leng, Qingfeng Xu, Kent A. Harries, Lingzhu Chen, Kewei Liu, Xi Chen
ENGINEERING STRUCTURES
(2020)
Article
Engineering, Civil
Mathew W. Bolduc, Avdhesh Gaur, Bahram M. Shahrooz, Kent A. Harries, Richard A. Miller, Henry G. Russell
JOURNAL OF BRIDGE ENGINEERING
(2020)
Article
Engineering, Civil
Tianqiao Liu, Janine Domingos Vieira, Kent A. Harries
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2020)
Article
Construction & Building Technology
Zhuolin Wang, Xiangmin Li, Lixue Jiang, Mingqian Wang, Qingfeng Xu, Kent Harries
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Forestry
Yusuf Akinbade, Ian Nettleship, Christopher Papadopoulos, Kent A. Harries
Summary: This study develops a framework and computational tools to evaluate the material and mechanical properties of bamboo in its full-culm form, including a numerical model with functionally graded material properties. The random field method is introduced to quantify uncertainty in bamboo measurements. Four different approaches to model bamboo circumferential compression tests are presented and compared with experimental results. The study raises questions about whether the functionally graded behavior of bamboo can truly be captured using the rule of mixtures.
WOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Civil
Kent A. Harries
Summary: This paper demonstrates a data-driven approach to determining modeling parameters for FRP-retrofitted RC columns in accordance with current standards and proposes parameters for flexure-dominated column behavior. A refined backbone curve is suggested for FRP-retrofitted columns, prescribing an incremental rotation capacity that takes into account the improved behavior of the retrofitted column. Modeling parameters for flexure-dominated columns are also proposed.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Forestry
Kent A. Harries, David Trujillo, Sebastian Kaminski, Luis Felipe Lopez
Summary: This paper demonstrates an approach for developing design load tables for full culm bamboo elements, reducing the need for repetitive calculation and facilitating "what-if" queries, making it suitable for bespoke in-house design aides or national annexes.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2022)
Review
Engineering, Civil
Enrique del Rey Castillo, Kent A. Harries, Rhys Rogers, Ravi Kanitkar
Summary: Fiber-reinforced polymer (FRP) ties can be used to provide tensile capacity to seismic-deficient concrete diaphragms, but there are no existing research or design provisions and guidance on how to design such ties is limited.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Engineering, Civil
J. Tatar, C. Viniarski, M. Ishfaq, K. A. Harries, M. Head
Summary: Externally bonded carbon fiber-reinforced polymer (CFRP) composites have been effective in strengthening concrete structures by flexure. However, the failure mode of intermediate crack debonding limits the utilization and deformability of the strengthened member. This paper presents the results of flexural tests on reinforced concrete beams strengthened with externally bonded CFRP anchored with U-wraps, showing that U-wraps can increase strain utilization and mitigate intermediate crack debonding without significantly affecting flexural capacity.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2023)
Article
Construction & Building Technology
Qingfeng Xu, Mingqian Wang, Lingzhu Chen, Kent A. Harries, Xiaobing Song, Zhenpeng Wang
Summary: This study presents the results of experimental and theoretical analysis of the shear performance of notched shear connections in CLT-concrete composite floor. A total of twentyseven specimens were tested and the variables included connection type, notch depth, screw inclination, and depths of CLT panel and reinforced concrete layer. The results showed that direct concrete shear failure was the main failure mode, but screws were able to enhance the shear capacity and change the failure mode to timber longitudinal crushing and concrete crushing. The combination of a notch and an adhesive layer achieved the highest slip stiffness and load bearing capacity.
JOURNAL OF BUILDING ENGINEERING
(2023)
Proceedings Paper
Architecture
S. L. Platt, K. A. Harries, M. J. McCabe
PROCEEDINGS OF THE 9TH INTERNATIONAL CONFERENCE ON SUSTAINABLE BUILT ENVIRONMENT (ICSBE 2018)
(2020)
Article
Architecture
Lola Ben-Alon, Vivian Loftness, Kent A. Harries, Erica Cochran Hameen, Michael Bridges
JOURNAL OF GREEN BUILDING
(2020)
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)