Article
Engineering, Mechanical
Mihaela Iordachescu, Andres Valiente, Maricely De Abreu, Patricia Santos, Elena Scutelnicu
Summary: This paper analyzes the cause of failure in a traffic signaling overhead porticoed structure on a major highway in Spain. The failure, which occurred after over 30 years of service, is attributed to environmentally induced fatigue initiators and the galvanized condition of the bolts.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Agricultural Engineering
Siyang Ji, Qunying Mou, Guangming Yuan, Haiqing Ren, Xiazhen Li
Summary: This study investigates the dowel-bearing behavior of bolted joints on bamboo scrimber and proposes estimation formulas based on experimental analysis. The results show that bolt diameter, sample thickness, and loading direction have an influence on the dowel-bearing behavior. Additionally, the failure mechanisms differ between samples loaded in parallel and perpendicular to the grain direction.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Mechanics
Z. Sajid, S. Karuppanan, K. E. Kee, N. Sallih, S. Z. H. Shah
Summary: This study evaluated the bearing performance and cost efficiency of single-lap, single-bolt joint of carbon/basalt hybrid composite. The hybrid arrangement of basalt layers sandwiched between carbon layers demonstrated improved mechanical performance and cost savings compared to pure carbon-based joints. Scanning electron microscopy revealed that the proposed hybrid scheme exhibited shear failure, different from all other hybrid designs which showed interlaminar failure.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Xiaoqi LI, Xiaoquan CHENG, Yujia CHENG, Zhiyong WANG, Wenjun HUANG
Summary: The research shows that HBB joint can provide multiple load transmission paths and resist damage propagation in the adhesive. Compared with pure bonded joint, HBB joint has higher strength and energy absorption capacity. In addition, HBB joint has greater initial damage load and tensile stiffness than pure bolted joint. Adhesive fillets can significantly improve the tensile performance of the HBB joint.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Mechanical
Przemyslaw Jaszak
Summary: The article presents experimental tests on the tightness assessment of a gasketed-flange-bolted joint with an elastomer-fiber gasket. It was found that increasing vibration cycles and bending amplitude leads to gradual leakage increase, which then stabilizes at higher amplitudes. Numerical calculations were used to determine the stress and strain of the gasket at maximum bending, and a semi-empirical model was proposed to predict the number of joint deformation cycles at which leakage remains constant.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Mechanics
Chao Feng, Lianyong Xu, Lei Zhao, Yongdian Han, Molin Su, Chentao Peng
Summary: This paper proposes a prediction model for the fatigue properties of welded joints, using a hybrid algorithm combining single-parameter decision-theoretic rough set (SPDTRS), cuckoo search (CS), and artificial neural network (ANN). The model improves the accuracy and stability of fatigue properties prediction by analyzing the weight of influencing factors and avoiding overfitting and local optimization. The experimental results show that the predicted S-N curves and fatigue life have a small error compared to the actual results, demonstrating the model's reliability and potential for fatigue design of welded structures.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Jun He, Zitong Wang, George Vasdravellis, Lei Wang, Haohui Xin, Jose Correia, Filippo Berto
Summary: Four push out tests were conducted to assess the structural performance of a welded demountable shear connector (WDSC) under high-cycle fatigue loading. The primary failure mode observed was stud fracture at the base. The presence of grout inside the tube significantly increased the WDSC's fatigue life by 5.4 times. The study also analysed stiffness degradation and relative slip evolution during fatigue cycles. Two finite element-based approaches were employed for fatigue life prediction: the critical plane method for fatigue crack initiation life and fracture mechanics for crack propagation life. Based on the experimental and numerical results, fatigue life prediction formulas (Wo & BULL;hler curves) are proposed for WDSCs with and without grout to aid in predicting fatigue failure in fatigue-sensitive structural designs.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Multidisciplinary
Yu Chang, Jianguo Ding, Hui Fan, Yuanyuan Ding, Hanjing Lu, Yiheng Chen, Adeel Shehzad, Hui Zhuang, Peng Chen
Summary: A hybrid method combining fractal theory with the finite element method (FT-FEM) is proposed to study the contact characteristics of bolted joints. Experimental validation shows that this method can accurately reveal the contact mechanisms at micro and macro scales and overcome difficulties in reflecting detailed contact characteristics in the overall dynamic model. The results also demonstrate that adjusting the bolt arrangement according to the working condition can effectively enhance bolted joints.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2022)
Article
Engineering, Civil
Zhengwen Jiang, Shui Wan, Zhi Fang, Aiming Song
Summary: The static and fatigue behaviors of a bolted GFRP/steel double-lap joint with a clamping force of 10 Nm were investigated experimentally. The fatigue damage evolution and stiffness degradation law were obtained, along with the F-N curve and a non-linear stiffness degradation model. Comparative analysis between GFRP/steel DLJ and GFRP/GFRP DLJ indicated differences, such as longer fatigue life and smaller compressive stresses in the bolt-hole of the outer GFRP laminates in the former.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
Lanxin Jiang, Shoune Xiao, Dawei Dong, Bing Yang, Dongdong Chen, Guangwu Yang, Tao Zhu, Mingmeng Wang
Summary: Tensile tests were conducted on bonded, bolted, and hybrid braided CFRP joints to investigate their mechanical properties. The results showed that hybrid joints exhibited better strength and stiffness compared to bonded joints. The strength of bonded joints was affected by the stacking sequence and lapping pattern. Additionally, the addition of an adhesive layer improved the balance of bolt load distribution.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Panpan Tian, Hongxing Qiu, Huiyu Wang
Summary: The ongoing research focuses on the mechanical properties of bolted-type glulam joints with environmental shrinkage cracks, showing significant reductions in parameters such as initial stiffness, peak load, and displacement due to cracks. Controlled climate change tests revealed the effects of cracks on the longitudinal integrity of joints, with proposed reduction coefficients for residual bearing capacity calculations demonstrating good consistency with experimental tests.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Mechanical
Tianyang Pang, Tianxiang Yu, Bifeng Song
Summary: This study proposes a hybrid Dynamic Gaussian Bayesian network (DGBN) model for failure prediction in lock mechanism systems. The model takes into account the correlations between influencing factors and failure modes and is integrated with measurement data and system failure analysis. Experimental results show that the proposed method can predict failures relatively accurately, even when partial measurement data are missing.
PROBABILISTIC ENGINEERING MECHANICS
(2023)
Article
Engineering, Mechanical
Long Yang, Bing Yang, Guangwu Yang, Lanxin Jiang, Shoune Xiao, Tao Zhu
Summary: Fa-N curves and σn_s-N curves of bolted connections under different geometric and load parameters were obtained through tensile-shear fatigue tests. The correlation of these curves was poor and did not meet engineering requirements. To address this issue, an equivalent structural stress calculation model considering the bolt load as the input condition was derived. A plate-shell finite element model for bolted connections was established to extract load parameters for bolts and obtain the equivalent structural stress at the crack initiation position. Finally, a fatigue evaluation method based on equivalent structural stress and considering geometric and load parameters was developed for bolted connections.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Construction & Building Technology
Gerhard Olivier, Fruzsina Csillag, Angeliki Christoforidou, Liesbeth Tromp, Martijn Veltkamp, Marko Pavlovic
Summary: Due to the low weight and excellent durability of composite materials, FRP decks mounted on steel superstructures are becoming increasingly common. Bolted joints are generally used to facilitate connections, but little is known about the fatigue and creep behavior of such joints. The objective of this research is to investigate connectors' feasibility through static, fatigue, and creep experiments on different types of bolted joints. The study focuses on application in vacuum-infused GFRP panels with integrated webs connected to steel bridge superstructures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
Teng Wang, Junchi Bin, Guillaume Renaud, Min Liao, Guoliang Lu, Zheng Liu
Summary: This paper proposes a new probabilistic prediction method that improves the prediction accuracy of fatigue crack growth by integrating multiple priors.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Aerospace
Kangkang Wang, Libin Zhao, Haiming Hong, Jianyu Zhang, Yu Gong
Summary: The study investigates the effects of different delamination parameters on the buckling, delamination propagation, and failure behaviors of composite laminates, concluding that delamination area is the key factor influencing the failure behaviors of delaminated composites.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Mechanics
W. M. Mahdy, Libin Zhao, Fengrui Liu, Rong Pian, Huiping Wang, Jianyu Zhang
Summary: This study reveals the failure mode of composite laminated cylindrical shells through a competitive failure analysis framework and parametric studies, identifying factors influencing buckling failure and stress failure. The study also examines the stress failure of different stacking sequences.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Ruixue Ji, Libin Zhao, Kangkang Wang, Fengrui Liu, Yu Gong, Jianyu Zhang
Summary: Research has shown that debonding defects can alter the post-buckling deformation modes and development paths of stiffened panels, leading to varying degrees of deflection and distortion in structures. This can change the failure behaviors and processes of composite laminates, further weakening the ultimate failure strength of the entire composite stiffened panels.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Yu Gong, Xinjian Chen, Wangchang Li, Libin Zhao, Junan Tao, Jianyu Zhang, Ning Hu
Summary: The effects of stacking sequence on the R-curve and traction-separation relation in unidirectional and multidirectional CFRP DCB laminates were systematically investigated, showing strong influence on fiber bridging length, steady-state fracture toughness, and maximum bridging stress. However, there was no clear relationship between these factors and the stacking sequence. The obtained traction-separation relations were successfully integrated into a tri-linear cohesive zone model and numerical results agreed well with test results, demonstrating applicability for delamination modeling in composite laminates with fiber bridging effects.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Meijuan Shan, Fengrui Liu, Wen Yang, Libin Zhao, Jianyu Zhang
Summary: The uncertainty in bearing fatigue properties of composite bolted joints was evaluated using a Progressive Fatigue Damage Model (PFDM) and the interval analysis method. The study found that the combination of PFDM and interval analysis showed potential in efficiently evaluating the fatigue reliability of complex bolted joints with sufficient accuracy.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Chemistry, Physical
Tianqi Liu, Xinxin Qi, Xinhong Shi, Limin Gao, Tian Zhang, Jianyu Zhang
Summary: Multiaxial asynchronous fatigue experiments on 30CrMnSiA steel showed that frequency ratio affects fatigue crack initiation and propagation, with cracks propagating differently on stress planes and leading to different crack growth lengths for constant and asynchronous loading. Various fatigue life prediction models were compared, with the Bannantine-Socie cycle counting method, section critical plane criterion, and Palmgren-Miner's cumulative damage rule proving to be more applicable.
Article
Mechanics
Jinrui Ye, Yu Gong, Junan Tao, Tiancheng Cao, Libin Zhao, Jianyu Zhang, Ning Hu
Summary: The R-curve and bridging traction-separation relation are important for understanding large scale fibre bridging behavior during delamination growth process. This study proposes a simple semi-analytical method that requires only experimentally recorded load and displacement to determine these relationships. The method avoids the need for complex devices or visual measurements, providing a more efficient and reliable approach for characterizing delamination behavior.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Tianqi Liu, Xinxin Qi, Xinhong Shi, Tian Zhang, Guangxin Zhang, Jianyu Zhang
Summary: Two-level step multiaxial fatigue tests on 30CrMnSiA steel revealed that crack growth behavior is influenced by the maximum normal stress planes, and the crack propagation length along the depth direction affects damage accumulation.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Yu Gong, Xinjian Chen, Luohuan Zou, Xiangqian Li, Libin Zhao, Jianyu Zhang, Ning Hu
Summary: This study experimentally and numerically investigates the effect of different elastic moduli of z-pins on the delamination behavior of laminated composites. It is found that the elastic modulus affects the steady-state fracture toughness, bridging zone length, and micro failure mechanism.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Tiancheng Cao, Libin Zhao, Linjuan Wang, Kangkang Wang, Yu Gong, Jianyu Zhang
Summary: A physically semi-analytical method is proposed to determine the mode II bridging law, and the accuracy and applicability of the method are validated through experiments and numerical simulations.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Xu Tianbao, Wei Ma, Yao Cheng, Dexuan Qi, Lei Sun, Fengqin Chang
Summary: The eutrophication of the tributary bay of the Three Gorges Reservoir is a major environmental problem. This study developed a mathematical model to analyze the factors contributing to eutrophication in a typical tributary bay. The results show that low water level operation, low flow velocity, non-point source pollution input, and water temperature stratification are the main drivers of eutrophication in the bay.
AQUA-WATER INFRASTRUCTURE ECOSYSTEMS AND SOCIETY
(2022)
Article
Mechanics
Yu Gong, Dingli Tian, Tiancheng Cao, Libin Zhao, Jianyu Zhang, Ning Hu, Chuanzeng Zhang
Summary: In this study, a novel delamination growth criterion considering the significant R-curve effects was proposed for mixed-mode I/II delamination predictions. Its adequacy and accuracy were validated by experimental data for two different composite materials. The proposed criterion is easy to use with only two experimentally obtained parameters.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Composites
Dingli Tian, Yu Gong, Luohuan Zou, Libin Zhao, Jianyu Zhang, Ning Hu
Summary: An artificial neural network-based approach is used to determine the R-curve of multidirectional laminates. The approach extracts hidden information of the R-curve from the load-displacement curve of mode I delamination test without measuring the delamination growth length. After training the neural network with simulated data, the load-displacement data are taken as input and the parameters of R-curve are the output. The predicted R-curves from the trained neural network are consistent with experimental results, demonstrating the applicability of this approach.
APPLIED COMPOSITE MATERIALS
(2023)
Article
Engineering, Civil
Yu Gong, Kaixin Xia, Yana Wang, Libin Zhao, Jianyu Zhang, Ning Hu
Summary: This study establishes a semi-analytical model for determining the mode II fracture toughness of multidirectional laminates. The effects of interfacial angles on fracture toughness are investigated and the model has a clear correlation with the interfacial angles, showing good agreement with test results.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Luohuan Zou, Yu Gong, Dingli Tian, Libin Zhao, Jianyu Zhang, Ning Hu
Summary: Delamination behavior in multidirectional laminates is affected by interface angle, and investigating the effect of interface angle on delamination behavior is crucial for practical engineering. This study analyzes the effects of interface angle on the R-curve, bridging stress, and failure mechanism through experiments and numerical simulations.
THIN-WALLED STRUCTURES
(2023)
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)