Article
Mechanics
Johannes Reiner, Reza Vaziri, Navid Zobeiry
Summary: The study proposed a data-rich framework to characterize the macroscopic strain-softening response of laminated composites under compressive loading using machine learning models. By simulating compression tests with an efficient FE model and training two ML methods, the study successfully demonstrated the effectiveness of using ML to reduce experimental efforts for damage characterization in composites subjected to compressive loads.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Amir Karimi-Nobandegani, Mohammadmahdi Gharib, Hamid Valipour
Summary: The phenomenological constitutive modelling of timber involves capturing different failure modes and strain/damage localization. A nonlocal integral continuum damage constitutive law was developed for timber and implemented in ABAQUS for finite element simulation. The model captures load-carrying capacity and different failure modes effectively and restores the objectivity of the results.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Composites
Johannes Reiner, Navid Zobeiry, Reza Vaziri
Summary: A simple and efficient finite element modelling approach is presented for simulating the residual strength of carbon fiber reinforced composite laminates after impact, with results showing reasonable predictions for different laminate structures and errors ranging from 10% to 30%.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Civil
Gregorio F. O. Ferreira, Jose Humberto S. Almeida, Marcelo L. Ribeiro, Antonio J. M. Ferreira, Volnei Tita
Summary: This study proposes a novel method to develop higher-order finite elements by considering progressive damage. The approach, based on Carrera's unified formulation, utilizes a damage model derived from continuum damage mechanics principles. The implemented User Element subroutine is capable of accurately and swiftly predicting progressive failure events and in-plane damage mechanisms for composite laminates under bending loadings, as observed in comparison to experimental results.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Johannes Reiner, Xiaodong Xu, Navid Zobeiry, Reza Vaziri, Stephen R. Hallett, Michael R. Wisnom
Summary: A virtual finite element framework is proposed to simulate fiber-dominated damage behavior in composite laminates under tensile loading, transitioning from high fidelity to computationally efficient models. The effectiveness of the nonlocal continuum damage model CODAM2 in predicting structural response in large-scale tests is demonstrated through comparison with high fidelity models and experimental data.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Felipe Ruivo Fuga, Mauricio Vicente Donadon
Summary: Efficient and reliable predictive modelling tools for damage tolerance analysis are crucial in the aerospace industry due to the potential of composite materials for design performance. Different approaches have been developed for interlaminar and intralaminar damage over the years. This study proposes a novel progressive damage model that addresses some shortcomings of current intralaminar Continuum Damage Mechanics (CDM) models, and compares the model predictions to experimental data through static and fatigue analysis.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
J. Llobet, P. Maimi, Y. Essa, F. Martin de la Escalera
Summary: The mesoscale continuum damage model for laminated composites developed by the AMADE research group over the past 10 years has been extended for fatigue life and residual strength predictions. The model includes new functions to account for material degradation under fatigue loads and uses the cycle jump approach to reduce computational cost. Validation of the computational model was done by simulating progressive failure mechanisms of open-hole and double-edge notched specimens under various load cases in the follow-up publication.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Mechanical
Johannes Reiner, Yun-Fei Fu
Summary: Genetic algorithms are used to identify input parameters for simulating progressive damage in carbon fiber reinforced polymers. The simulation of low velocity impact tests validates the data-driven parameter identification and the capability to account for different types of damage. The efficient modeling technique can simulate impact tests in a short amount of time with realistic representations of delamination, enhancing the transparency and repeatability of finite element simulations of composites.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Mechanics
Peyman Shabani, Lucy Li, Jeremy Laliberte, Gang Qi, Daniel Rapking, David Mollenhauer
Summary: A high-fidelity finite element model based on integrated discrete and continuum damage modeling techniques was developed to accurately predict damage modes, locations, sizes, and damage occurrence sequence in a composite laminate during a low-velocity impact event. The model was validated and shown to have high accuracy in predicting impact response and damage areas.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Christian Gerendt, Maryam Hematipour, Nils Englisch, Sven Scheffler, Raimund Rolfes
Summary: This study presents a new continuum damage modeling framework for the predictive strength and fatigue analysis of mechanical joints in fiber-reinforced polymer (FRP) composites with local metal hybridization. The framework is able to predict the joint's failure mode under both static and fatigue loading, which is crucial for the identification of damage tolerant lightweight joint designs.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Geological
Yijun Chen, Mostafa E. Mobasher, Haim Waisman
Summary: This study presents a novel dynamic poroelastic model for soil consolidation in saturated porous media. Numerical simulations are conducted to investigate soil consolidation under harmonic excitations and demonstrate the effectiveness and stability of the damage model.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Materials Science, Composites
Johannes Reiner, Nhu H. T. Nguyen
Summary: This study proposes a Discrete Element Method (DEM) for analyzing the progressive failure of IM7/8552 carbon fiber reinforced polymer laminates at the macroscale. The DEM model is calibrated using experimental results from over-height compact tension (OCT) tests and validated with various open-hole tension (OHT) test specimens. The results show that DEM can incorporate damage evolution leading to realistic macroscopic damage patterns, but with a computational cost 100 times higher than finite element (FE) simulations.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shubham Rai, Badri Prasad Patel
Summary: This article develops a failure mode-dependent phenomenological continuum damage model that takes into account the coupling of damage in different directions. The model parameters are characterized using experimental data, and the finite element method is used to predict the damage evolution in a laminated composite plate. The developed model is compared with a failure mode independent model.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Mechanical
Naidan Hou, Renxi Zhao, Jian Li, Xuan Wang, Xi Li, Hao Cui, Yulong Li
Summary: This study investigates the damage caused by rain erosion on aircraft during supersonic flight through high-speed waterjet impact experiments on composite laminates. The experiment and simulation results confirm the effectiveness of the numerical methods used. The study finds that water-hammer pressure, stagnation pressure, and stress wave propagation are the main failure mechanisms for matrix damage in CFRP impacted by waterjets. The velocity and diameter of the waterjets are crucial factors affecting the extent of damage on CFRP.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Johannes Reiner, Thomas Feser, Matthias Waimer, Anoush Poursartip, Heinz Voggenreiter, Reza Vaziri
Summary: This study explores the challenges of finite element simulation of industrial size composite structures under crush loading, investigating the capabilities, limitations, and challenges of physically-based axial crush simulation of composite structures without the use of non-physical parameters for model calibration. It highlights the unsuitability of crack band scaling in CDM-based material models for axial crushing simulations dominated by fragmentation.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Julius O. Orwa, Johannes Reiner, Albert Juma, Alastair Stacey, Kallista Sears, Jurg A. Schutz, Andrea Merenda, Lachlan Hyde, Rosanne Guijt, Vahid R. Adineh, Quanxiang Li, Minoo Naebe, Abbas Z. Kouzani, Ludovic F. Dumee
Summary: It was found that pre-seeding carbon fibers with nanodiamonds is crucial for protecting the fibers from hydrogen plasma attack and promoting diamond growth during chemical vapor deposition. Larger crystallite size carbon fibers showed less susceptibility to etching compared to smaller crystallite size fibers. Additionally, dense seeding with smaller sized nanodiamonds resulted in faster coalescence and provided significant benefits in terms of protection from hydrogen plasma attack.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Engineering, Multidisciplinary
M. H. Nagaraj, J. Reiner, R. Vaziri, E. Carrera, M. Petrolo
Summary: This paper presents a refined progressive damage analysis method for fiber-reinforced laminated composites under compressive loads, utilizing higher-order structural theories and numerical assessments to verify its effectiveness.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Mechanics
Johannes Reiner, Reza Vaziri, Navid Zobeiry
Summary: The study proposed a data-rich framework to characterize the macroscopic strain-softening response of laminated composites under compressive loading using machine learning models. By simulating compression tests with an efficient FE model and training two ML methods, the study successfully demonstrated the effectiveness of using ML to reduce experimental efforts for damage characterization in composites subjected to compressive loads.
COMPOSITE STRUCTURES
(2021)
Review
Geosciences, Multidisciplinary
Abolfazl Baghbani, Tanveer Choudhury, Susanga Costa, Johannes Reiner
Summary: This study reviewed the application of artificial intelligence methods in geotechnical engineering and identified nine prominent areas. Artificial Neural Network (ANN) emerged as the most widely used AI method. The analysis shows that the success and accuracy of AI applications depends on the number and type of datasets and selection of input parameters.
EARTH-SCIENCE REVIEWS
(2022)
Article
Mechanics
Johannes Reiner, Jake Wood, Mahbube Subhani
Summary: ENF and CS tests were conducted to evaluate Mode II fracture properties in wood using Australian Radiata Pine. The capabilities and limitations of each test were compared in terms of testing convenience, reduction schemes for determining Mode II fracture toughness or strain-energy release rate, stable crack growth, and mixed mode behavior. Results showed that ENF tests provide stable and reliable Mode II fracture with minimal mixed-mode behavior, unlike CS tests. Crack length measurements were only necessary to determine initial fracture energy values associated with crack lengths up to 20 mm, while compliance-based beam theory was used to calculate steady-state fracture energies using an equivalent crack length derived from global load-displacement test data.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Forestry
Shaikh Atikur Rahman, Mahmud Ashraf, Mahbube Subhani, Johannes Reiner
Summary: This study compares the performance of four continuum damage models for simulating the behavior of timber materials and validates the reliability of the MAT-261 model in simulating timber fracture behavior.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2022)
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)
Review
Forestry
John Paul Cabral, Bidur Kafle, Mahbube Subhani, Johannes Reiner, Mahmud Ashraf
Summary: Timber densification is a process that enhances the structural properties of timber by altering its cellular structure through compression, chemical impregnation, or a combination of both. The density and mechanical properties of the timber can be modified by adjusting parameters such as compression ratio and temperature. The current processes, effects, and potential future directions of timber densification are discussed in this paper.
JOURNAL OF WOOD SCIENCE
(2022)
Article
Materials Science, Ceramics
Johannes Reiner, Darren Narain, Peng Zhang, Emmanuel A. Flores-Johnson, Ondrej Muransky
Summary: This study quantifies the damage resistance of cross-ply C/C composites using compact tension tests at room temperature. The analysis of different specimen sizes shows that baseline and large scaled-up samples yield consistent fracture energy values, while the scaled-down version shows unwanted failure. A microscopic cross-sectional analysis explains the relatively low fracture energy values of C/C composites compared to carbon fibre reinforced polymers.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Udesh M. H. U. Kankanamge, Johannes Reiner, Xingjun Ma, Santiago Corujeira Gallo, Wei Xu
Summary: With the increasing use of CubeSats in space exploration, the demand for reliable high-temperature shape memory alloys (HTSMA) continues to grow. This study uses a data-driven approach to identify suitable NiTiHf alloys for actuator applications in space. Of the machine learning models evaluated, the K-nearest neighbouring model offers reliable and accurate prediction in developing NiTiHf alloys with balanced functional properties.
JOURNAL OF MATERIALS SCIENCE
(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
Materials Science, Composites
Johannes Reiner, Nhu H. T. Nguyen
Summary: This study proposes a Discrete Element Method (DEM) for analyzing the progressive failure of IM7/8552 carbon fiber reinforced polymer laminates at the macroscale. The DEM model is calibrated using experimental results from over-height compact tension (OCT) tests and validated with various open-hole tension (OHT) test specimens. The results show that DEM can incorporate damage evolution leading to realistic macroscopic damage patterns, but with a computational cost 100 times higher than finite element (FE) simulations.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Mechanics
Yun-Fei Fu, Johannes Reiner
Summary: This study explores the application of genetic algorithms for the objective and automated calibration of damage models in composite materials. The method is demonstrated to be generally applicable and robust through three case studies involving carbon and glass fiber-reinforced laminates. The load-displacement curves of fracture tests are used to optimize the input parameters of the damage models. The optimized parameters produce accurate and physically meaningful results, as validated in independent load cases and through good correlation with experimental observations.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Janeshka Goonewardena, Mahmud Ashraf, Johannes Reiner, Bidur Kafle, Mahbube Subhani
Summary: This paper investigates the mechanical properties of bamboo scrimber and laminated bamboo lumber (LBL) and proposes a generic constitutive model. The study suggests that the 1% proof stress can be used to accurately predict the material response of bamboo scrimber.
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)
