Article
Materials Science, Composites
Jon Haitz Badiola, Diego Pineda, Blanca Maria Lekube
Summary: A study was conducted on the relationship between injection molding parameters and the resulting fiber length, orientation, and mechanical properties of highly reinforced long fiber thermoplastic (LFT) polypropylene (PP). It was found that the longest fibers were obtained under the conditions of lowest backpressure and highest screw speed. The importance of backpressure increased as the amount of glass fiber reinforcement increased, contrary to less reinforced thermoplastics. Injection speed did not affect fiber breakage, but had a significant impact on fiber orientation and tensile strength, especially when the average fiber length was below 1000 μm. When the average length exceeded 1000 μm, the fibers formed a mesh that thickened the core region and hindered orientation, resulting in reduced tensile strength but improved impact resistance.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Mohammad Amjadi, Ali Fatemi
Summary: This paper proposes a critical plane-based fatigue damage model for predicting tension-tension or tension-compression fatigue life of short glass fiber-reinforced thermoplastics, considering fiber orientation and mean stress effects. The model also includes temperature and frequency effects, and comparisons are made with experimental data to validate and analyze the model predictions.
Article
Polymer Science
Luiza R. Melo de Lima, Sara P. Magalhaes da Silva, Tito Trindade, Jose M. Oliveira
Summary: Poly(propylene) (PP)-based graphene nanoplatelets (GnPs) nanocomposites are processed using a melt blending technique. Rheological characterization shows that the presence of GnPs decreases the viscosity of the nanocomposites, while the addition of a compatibilizer improves adhesion and dispersion between PP and GnPs.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Rubiane Bortolatto, Paulo Rodrigo Stival Bittencourt, Fabio Yamashita
Summary: This study developed materials using soybean hull and other raw materials, and found that soybean hull concentration between 8% and 15% acted as a structural reinforcer to increase tensile strength and dimensional stability, while the addition of PVA reduced tensile strength.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Patrick Hirsch, Marianne John, Daniel Leipold, Andre Henkel, Sylvia Gipser, Ralf Schlimper, Matthias Zscheyge
Summary: The study investigated the anisotropic mechanical behavior of hybrid injection molded short and continuous fiber-reinforced thermoplastics and used numerical simulations to predict the resulting mechanical properties. The results showed that the flow rate during injection molding had a significant effect on fiber orientation but not on fiber length, leading to improved prediction of mechanical behavior under flexural loading. Using implemented injection molding data in the numerical simulation significantly reduced the deviation between predicted and experimentally measured flexural strength.
Article
Polymer Science
Zhengyang Dong, Peng Zhao, Jianguo Zheng, Kaipeng Ji, Yuhong Chen, Jianzhong Fu
Summary: The proposed IGAO method utilizes batch information for self-learning without establishing a large number of experimental models, with fast convergence, 25% fewer steps, good stability, and is suitable for parameter optimization in batch processes.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Quan Jiang, Tetsuo Takayama, Akihiro Nishioka
Summary: A mechanical model was developed to explain the impact strength of SGFRTP injection molded products using interfacial shear strength. The model showed good agreement with experimental results.
Article
Polymer Science
Lun Howe Mark, Chongxiang Zhao, Raymond K. M. Chu, Chul B. Park
Summary: This study focuses on the creation and application of PET nanofibrils for PP composite reinforcement. By using a spunbond process, PET nanofibrils are fibrillated within a PP matrix, leading to improved tensile and flexural performance in injection molded parts. The nanofibrils also enhance the microcellular morphology in foam injection molding, resulting in further improved performance.
Article
Polymer Science
Douglas R. Wilcox, Rebekah Shepherd, Geoffrey W. Brown, Jena M. Mccollum
Summary: The mechanical properties of fluorinated thermoplastics can be influenced by changes in injection molding processing parameters. The influence of CTFE concentration, dwell time, and cooling time on the tensile response of dog bone specimens was assessed. The first injected specimen exhibited lower tensile strength and higher elongation, and this trend became more pronounced with higher CTFE concentration and lower molecular weight.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Jian Zhao, Chengjie Guo, Xiubin Zuo, Allen Jonathan Roman, Yinghao Nie, Dong-Xiao Su, Lih-Sheng Turng, Tim A. Osswald, Gengdong Cheng, Weidong Chen
Summary: This paper presents a methodology for calculating the elasto-plastic behaviors of injection-molded short fiber composites. The fiber orientation distribution is obtained using micro-computed tomography, and numerical modeling and finite element homogenization are employed to analyze the mechanical properties. Experimental results show that the proposed method accurately predicts the effective mechanical behaviors of the composites.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Chemistry, Physical
Riccardo Ivan, Marco Sorgato, Filippo Zanini, Giovanni Lucchetta
Summary: In this study, a data-driven inverse modeling approach is proposed to improve the physics-based structural simulation of short glass fiber reinforced thermoplastics. The approach optimizes the fiber orientation distribution and identifies the composite's mechanical properties using a genetic algorithm. Artificial neural networks are used as a surrogate model to reduce computational time. The proposed approach improves the prediction accuracy of the simulation results and reduces computational time.
Article
Polymer Science
Ioannis Ioannou, Paraskevas Kyriacou, Marios Pantelas, Ioannis Pashalidis, John Makris, Spyros Rallis, Giachalis Kostas, Kyriakos Avraam, Theodora Krasia-Christoforou
Summary: The study focuses on the fabrication and thermomechanical characterization of fully recycled composite materials based on HDPE reinforced with bio-natural carbonized Luffa cylindrica inclusions. The use of the twin roll mill process enabled the production of polymer composites with variable c-LC content, with morphological and thermomechanical analysis confirming the reinforcing effect of biochar inclusions on HDPE thermoplastic. This opens the way for the potential use of such fully-recycled biochar thermoplastic composite materials in structural and semi-structural applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Ming-Shyan Huang, Shih-Chih Nian, Guan-Ting Lin
Summary: This study optimized the injection molding process by adjusting key parameters such as injection speed, V/P switchover point, and first-stage holding pressure, which resulted in improved pressure curves and injection molding quality. Experimental results demonstrated significant enhancements in part quality and process stability through these adjustments.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Mechanics
Dieter Meinhard, Andreas Haeger, Volker Knoblauch
Summary: In this study, a carbon fiber-reinforced thermoplastic (CFRTP) laminate was drilled and evaluated. The dominant damage type was identified as burr formation, with no critical influence on the mechanical performance.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Qingzhu He, Bailong Jiang, Zhanyu Zhai, Changqian Hao
Summary: Injection compression molding technique with self-resistance electric heating has a significant impact on the properties of carbon fiber reinforced thermoplastics (cCFRTs) components. Understanding the manufacturing process and minimizing the introduction of undesirable factors is necessary. This study investigates the influence of process parameters on the impregnation quality and mechanical properties of cCFRTs.
POLYMER COMPOSITES
(2023)
Article
Engineering, Mechanical
Luca Landi, Alessandro Stecconi, Giulia Morettini, Filippo Cianetti
Summary: The paper discusses the importance of using innovative analytical methods to design and optimize the root geometry of plastic gears in the absence of specific standards for plastic gear development. By comparing the results with standardized methods and verifying them through finite element numerical analysis, the paper provides a useful approach for designers to reduce root bending stress in plastic gears.
MECHANISM AND MACHINE THEORY
(2021)
Article
Chemistry, Physical
Massimiliano Palmieri, Guido Zucca, Giulia Morettini, Luca Landi, Filippo Cianetti
Summary: The study investigates the use of spectral methods to predict the fatigue life of additive manufactured components, and the results show that these methods are accurate and adaptable through comparison with experimental testing.
Article
Chemistry, Multidisciplinary
Luca Landi, Silvia Logozzo, Giulia Morettini, Maria Cristina Valigi
Summary: Ballistic penetration of machine guards is crucial for safety. The current standardized tests have limitations in fully studying the influence of different design parameters on the guards' capacity. This study uses theoretical models, experimental tests, and 3D optical scanners to investigate the impact of machine guard size on ballistic penetration capacity.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Multidisciplinary
Luca Landi, Eckart Uhlmann, Robert Hoerl, Simon Thom, Giuseppe Gigliotti, Alessandro Stecconi
Summary: This paper introduces the method for determining the impact resistance of machine guards and discusses the limitations of existing methods. It presents a new probabilistic approach for assessing the impact resistance and validates this method through experimentation.
ASCE-ASME JOURNAL OF RISK AND UNCERTAINTY IN ENGINEERING SYSTEMS PART B-MECHANICAL ENGINEERING
(2022)
Article
Engineering, Manufacturing
Giulia Morettini, Massimiliano Palmieri, Lorenzo Capponi, Luca Landi
Summary: The industrial interest in additive manufacturing techniques is increasing, and it is important to simulate the structural behavior of parts made using this technology. This study aims to determine the mechanical and physical properties of a specific material for the development of reliable finite element models for static and dynamic analysis.
PROGRESS IN ADDITIVE MANUFACTURING
(2022)
Article
Computer Science, Information Systems
Teodoro Montanaro, Ilaria Sergi, Ilaria Stefanizzi, Luca Landi, Luciano Di Donato, Luigi Patrono
Summary: This paper proposes an IoT-aware architecture for the industrial domain to support maintenance operators. It guides operators step by step while monitoring the plant, machinery, and other employees in real-time. A prototype was developed and functionally tested to demonstrate the feasibility and usefulness of the proposed system.
APPLIED SYSTEM INNOVATION
(2023)
Proceedings Paper
Engineering, Mechanical
L. Landi, M. Vittori, A. Stecconi, M. C. Valigi
Summary: This study investigates the ballistic penetration of machine tool guards using 4mm thick polycarbonate sheets, evaluating the ballistic limit for different sizes of the sheets. It also examines the influence of constraints on the standardized sheets, aiming to review the ISO standardization annexes on ballistic penetration.
49TH ITALIAN ASSOCIATION FOR STRESS ANALYSIS CONFERENCE (AIAS 2020)
(2021)
Article
Engineering, Multidisciplinary
Alessandro Stecconi, Luca Landi
ASCE-ASME JOURNAL OF RISK AND UNCERTAINTY IN ENGINEERING SYSTEMS PART B-MECHANICAL ENGINEERING
(2020)
Article
Engineering, Electrical & Electronic
Maria Cristina Valigi, Silvia Logozzo, Luca Landi, Claudio Braccesi, Luca Galletti
Proceedings Paper
Engineering, Mechanical
L. Landi, D. Amici, O. Alunni Boldrini, E. Germani
AIAS2017 - 46TH CONFERENCE ON STRESS ANALYSIS AND MECHANICAL ENGINEERING DESIGN
(2018)
Proceedings Paper
Engineering, Industrial
Luca Landi, Agnese Sorgenti, Denny Clerini
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2017, VOL 11
(2018)
Proceedings Paper
Engineering, Mechanical
Luca Landi, Damiano Amici
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2016, VOL. 14
(2017)
Proceedings Paper
Engineering, Mechanical
Claudio Braccesi, Filippo Cianetti, Luca Landi
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2015, VOL 4B
(2016)
Proceedings Paper
Engineering, Mechanical
Luca Landi, Claudio Braccesi, Filippo Cianetti, Simone Lucertini
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2015, VOL. 11
(2016)
Article
Engineering, Mechanical
Willy Ank de Morais, Railson Bolsoni Falcao, Mario Boccalini Jr, Fernando Jose Gomes Landgraf
Summary: This study compares the fatigue behavior of bcc Nb-48 wt%Ti (Ti-36at%Nb) alloy parts processed by Laser Powder Bed Fusion (L-PBF) using two different types of powders (spherical powder produced by Plasma Atomization and irregularly shaped powder produced by Hydride-Dehydride). The results show that the fatigue behavior is similar for both powders, but the specimens produced from the Hydride-Dehydride powder have higher dispersed results. Fracture primarily occurs in the porosities near the machined sample surface, and the fatigue cracks propagate in a zigzag mode parallel to the L-PBF building direction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Guoxi Jing, Shuai Sun, Teng Ma, Shubo Li, Tian Ma, Junchao Wei, Jianchao Pang
Summary: This study proposes a parameter identification method for predicting the TMF life of CGI materials used in cylinder heads. The study evaluates the TMF behavior of RuT450 material and successfully predicts its TMF life using multi-objective optimization. The results highlight the influence of plastic strain amplitude, temperature, and strain rate on the damage mechanism and life prediction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xin Zhang, Xu Li, Weipeng Xu, Kuidong Gao, Kao Jiang, Xinyu Wang, Hongxin Wei
Summary: Conical picks are commonly used in tunnel excavation and often experience high temperatures during the cutting process. This study investigated the influence of temperature on the wear of conical picks and proposed a method for measuring rock abrasiveness that takes into account the thermal effect. The experimental results showed that cooling liquid reduced the maximum temperature and the mean mass loss of the conical pick. Additionally, the study examined the characteristics of oxygen and found evidence of peeling, cracking, and oxidation on the grinding rod used for rock abrasiveness measurement.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Vivek Srivastava, Deependra Singh, A. G. Rao, V. P. Deshmukh
Summary: Engine gear failures are a significant concern in various industries. Investigating each gear failure and determining the root cause is important for preventing future failures. This study used experimental and numerical analysis techniques to investigate the premature failure of a flywheel gear in a marine diesel engine. The findings revealed that the gear failed due to overload stresses caused by overload torque generated from sudden inertial thrust in the internal combustionengine.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jun Zhang, Weidong Liu, Feilong Liu, Zhiqiang Yang, Jinfang Peng, Minhao Zhu
Summary: During a major overhaul of an aeroengine, a cracked stator vane of the low-pressure compressor was discovered, with the crack originating from a corrosion pit located on the arc transition between the leading edge and the upper edge plate. The fracture surface exhibited signs of fatigue cracks, indicating a pit-related fatigue crack. Metallographic examination revealed that most corrosion pits were distributed beneath the bulging or peeling paint layer on the leading edge and the concave side. Identification of the corrosion products showed the presence of sulfate and alumina, suggesting atmospheric corrosion as a likely cause for the cracked stator vane.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Juan Jose Jimenez de Cisneros Fonfria, Ester Olmeda, Susana Sanz, Maria Garrosa, Vicente Diaz
Summary: Energy absorbing devices in vehicles can partially transform impact energy and protect passengers. In this paper, the failure analysis of the underframe crumple zone in a train car was conducted through finite element simulations, showing that the component acted properly after the impact.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Fengqi Zhang, Gang Luo, Haiyang Zhang, Peihong Cong, Lulu Liu, Wei Chen
Summary: In this study, a predictive model for bird strike trajectory was developed based on the quasi-linear viscoelastic model. By combining simulation analysis under multiple conditions, the model reproduced the trajectory change law in low and medium speed bird impact experiments.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
S. M. de Gouveia, L. de Abreu Correa, D. B. Teles, M. Oliveira, T. G. R. Clarke
Summary: Emergency Shutdown Valves (EDSVs) are used in industrial applications to interrupt fluid flow during hazardous events. The damage to the valve seats can be detected by analyzing the pressure and torque data. This study compared three processing options and found that evaluating the complete signature with a Gradient Boosting Classifier algorithm is the most effective strategy.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xinyan Jin, Kai Wang, Hongwei Qian
Summary: This study investigated the root cause of an abnormal premature groove-clogging failure on a sink roll in a hot-dip galvanizing line. It was found that the failure was caused by the buildup of a large amount of Fe2Al5Znx dross in the grooves, and the key factor was the control of Tstrip.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Zhiqiang Li, Jie Li, Cen Li, Xiaodong Xie, Zhiyong Yang
Summary: In this study, the microstructure evolution of the material in the hot spot area of the high-speed train brake disc was observed and the mechanism of mechanical property degradation was obtained through tensile tests. The research results provide guidance for crack damage identification of the brake disc and condition-based maintenance.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Lijia Luo, Yincheng Wang, Wei Chen, Zuming Zhao, Wenfei Chen, Shiyi Bao
Summary: Tube-to-tube impact wear is a significant factor in the failure of alloy 690 tubes in nuclear steam generators. This paper investigates the wear damage mechanism and detection method of alloy 690 tubes under tube-to-tube impact loads. The results reveal the wear damage mechanism through analysis of macro and micro morphologies as well as metallographic structures. A nonlinear ultrasonic wave mixing method is proposed for damage detection and a detection device is developed to implement this method. Experimental results indicate that the damage mode of tube-to-tube impact wear varies with impact load and cycle number, and the nonlinear modulation index is effective in assessing the damage degree of alloy 690 tubes.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xing-Ju Yang, Feng Lin, Xu Du, Lu Qiu
Summary: This paper proposes a novel method of improving the progressive collapse resistance of RC frame structures by adding locally debonded kinked steel plates (KPs). Experimental tests and finite element analysis reveal that the addition of KPs significantly enhances the ultimate resistance and deformability of the beam-slab substructures. The mechanism of resistance improvement is explained, and an analytical model is developed for predicting the ultimate resistance of the structures.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xiaohe Wang, Zengqiang Cao
Summary: This paper presents a dynamic installation (DI) method based on electromagnetic force to reduce damage to composite laminates and improve joint performance. The study shows that DI can effectively decrease installation resistance, reduce severe damage to laminates, and improve stress distribution in the joint.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jitong Cui, Yingying Kong, Cuiwei Liu, Baoping Cai, Faisal Khan, Yuxing Li
Summary: This paper presents a method for quantifying the failure probability of hydrogen doped pipelines and utilizes Bayesian network for quantitative calculation. The results show that this method can more accurately assess the failure probability of hydrogen doped pipelines and provide a decision basis for preventing failure accidents.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Yiping Jiang, Maoru Chi, Jungang Yang, Liangcheng Dai, Yuchen Xie, Zhaotuan Guo
Summary: This article investigates and simulates the derailment of empty freight trains at the switch section of a turnout in the diverging route, and proposes preventive measures. The results show that the derailment is caused by the combined effect of various factors, and reducing the longitudinal coupler force and the wheel rail friction coefficient can decrease the possibility of derailment. Additionally, installing a guard rail in front of the turnout can effectively prevent derailment.
ENGINEERING FAILURE ANALYSIS
(2024)
