Article
Mechanics
Junliang Ding, Li Cheng
Summary: Multi-wall carbon nanotubes significantly improve the anti-fatigue performance of carbon fiber reinforced plastics, ultimately extending their ultra-high cycle fatigue life. The three-parameter Weibull distribution function is more in line with the distribution characteristics of CFRP fatigue life data.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Junliang Ding, Li Cheng
Summary: The addition of silica nano-particles significantly extended the fatigue life of CFRP by enhancing the connection strength between polymer and carbon fiber, and by passivating and even blocking the growth of fatigue cracks. The fatigue damage morphologies of the nano-particles modified CFRP were closely related to stress magnitude, and stiffness degradation exhibited staged change characteristics with the evolution of damage morphologies.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Tao Wu, Weixing Yao, Chao Xu
Summary: This study conducted microscopic observation and statistical investigation on matrix cracks in braided CFRP under ultra-high cycle fatigue loading, establishing a bimodal distribution model of matrix crack density. Based on this, an ultra-high cycle fatigue life distribution model for braided CFRP was developed, and the corresponding fatigue life of CDS was obtained and verified through crack density evolution curve.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Han Wu, Chengqi Sun, Wei Xu, Xin Chen, Xiaolei Wu
Summary: In this paper, a continuous runout method (CRM) is proposed to evaluate the fatigue strength in high cycle and very high cycle fatigue regimes based on the probability and statistics theory. The CRM features the simultaneous testing of multiple samples, which reduces the testing period to 1/5-1/3 of that by the common up-and-down method for 16 samples. Experimental data for G20Mn5QT steel, 40 Cr steel, and Ti-6Al-4V alloy validate the CRM's predicted lower limits of fatigue strength, which are slightly more conservative than those obtained by the up-and-down method.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Rui Hu, Zhi Fang, Ruinian Jiang, Yu Xiang, Chuanle Liu
Summary: This paper comprehensively studied the flexural fatigue behavior of UHPC beams prestressed with CFRP tendons and developed a fatigue prediction model to simulate the fatigue evolution. The research considered the fatigue constitutive model of materials and analyzed the performance of UHPC and CFRP tendons by calculating strain and stress, while also taking into account the influence of steel fibers on crack resistance and deflection.
ADVANCES IN STRUCTURAL ENGINEERING
(2022)
Article
Engineering, Industrial
Naoki Yamaguchi, Tsuyoshi Shiozaki, Yoshikiyo Tamai
Summary: The new technique of micro-needle peening can improve the fatigue strength of ultra-high strength steel joints without causing crack-like defects, outperforming traditional needle peening and shot peening. The surfaces of joints treated with micro-needle peening and shot peening exhibited smooth surface finishes.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Angelo Savio Calabrese, Tommaso D'Antino, Pierluigi Colombi, Carlo Poggi
Summary: This study evaluates the response of the tensile properties of PBO FRCM composite to low- and high-cycle fatigue through implementing low-cycle fatigue tests, high-cycle fatigue tests, and post-fatigue tests. The results indicate that the mean stress and amplitude of fatigue cycles affect the specimen behavior and mode of failure.
Article
Engineering, Civil
Deming Zeng, Mingli Cao
Summary: The study found that adding WF could significantly resist and delay the formation of microcracks in UHPC, and when added to UHPC with steel fibers, it greatly improved the flexural properties of concrete from micro to macro scale. Accelerated curing improved flexural strengths but decreased the toughness of WFMUHPC with steel fiber. The load-deflection curves showed noticeable improvement in first crack load due to the reinforcement effect of WFs on steel fiber.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Shaojun Song, Junfeng Jing, Wei Cheng
Summary: Glass fiber-based composites are widely used due to their excellent properties, but they are prone to fatigue-induced deformation damage. Existing monitoring methods are not suitable for industrial production. This article proposes a machine vision-based online monitoring system that can identify fatigue deformation in real-time. The system has a high deformation accuracy and a low false alarm rate, as confirmed by on-site testing and evaluation.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Mechanics
Egor Morokov, Vadim Levin, Tatyana Ryzhova, Evgeny Dubovikov, Yulia Petronyuk, Igor Gulevsky
Summary: This work presents the experimental investigation of bending damage evolution in a laminated structure. The damage formation was detected and visualized using acoustic emission and high-frequency acoustic microscopy. The study reveals the relationship between AE activity, energy of AE pulses, and the loading curves, providing insights into the damage evolution in composite materials.
COMPOSITE STRUCTURES
(2022)
Article
Polymer Science
Bi-Jin Xiong, Zhen-Xian Chen, Jian Kang
Summary: Macroscopic and microscale creep deformations of UHMWPE were studied using in situ SAXS. A methodology for measuring the local creep deformation of inter-lamellar amorphous phase was proposed, showing that entanglements play a significant role in both macroscopic and local creep behavior.
CHINESE JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Xuze Zhang, Fang Liu, Min Shen, Donggui Han, Zilong Wang, Nu Yan
Summary: The evaluation of fatigue life in metallic materials is crucial for ensuring the safety and durability of metal structures. A new prediction method using machine learning was proposed to improve the accuracy and efficiency of ultra-high-cycle fatigue life prediction in metallic materials. Two prediction models were constructed based on the gradient boosting and random forest algorithms, using a training database containing fatigue life data from various metallic materials. The performance of the models was evaluated using mean square error and coefficient of determination, and their advantages and application scenarios were discussed. The constructed models were used to predict the ultra-high-cycle fatigue life of GCr15 bearing steel, with the GB model showing only one data point exceeding the triple error band and the RF model demonstrating higher stability. The coefficient of determination and mean square error for the GB and RF models were 0.78, 0.79 and 0.69, 3.79, respectively. Both models proved to be efficient and effective in quickly predicting the ultra-high-cycle fatigue life of metallic materials.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Rui Yu, Xueyu Zhang, Yawen Hu, Jiahui Li, Fengjiao Zhou, Kangning Liu, Jingjing Zhang, Jinnan Wang, Zhonghe Shui
Summary: The study proposes a design and optimization method for developing an Ultra-High Performance Concrete (UHPC) with rapid setting and hardening characteristics. An optimized cementitious mixture is obtained using the response surface approach, and the particle dense packing skeleton of UHPC is designed based on the particle dense packing model. The effects of water and steel fibre contents on the properties of the developed UHPC matrix are investigated. The results show that the newly designed UHPC has advanced mechanical properties and durability, making it promising for use in construction rapid reparation.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Sun-Jae Yoo, Se-Hee Hong, Young-Soo Yoon
Summary: In this study, pull-out tests were conducted to evaluate the bond strength between helically ribbed CFRP bars and UHPC. The effects of bar profile, embedment length, and diameter of the CFRP bar on bond strength were investigated and compared with NC and HC. The results showed that the bond strength of helically ribbed CFRP bar increased with the cover thickness of concrete, compressive strength of concrete, embedment length, and diameter of the CFRP bar. The modified bond equations with helically ribbed and sand coated CFRP bars were proposed to improve the accuracy of prediction.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Mechanics
E. Kormanikova, K. Kotrasova
Summary: This article explores the method of using micro-macro modeling for seismic response calculation in a composite rectangular tank filled with liquid.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)