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
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
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
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
Xing Liu, Dezhong Xu, Jiahui Lin, Long Zhang, Yinping Zeng, Qiang Chen
Summary: Metallographic analysis techniques were used to observe the morphology of spline wear, confirming the presence of fretting wear characteristics. Microstructural analysis revealed surface carburization treatment on the splines. Hardness tests showed a gradual decrease in hardness, consistent with the observed microstructural features. The chemical composition of the spline was also analyzed.
ENGINEERING FAILURE ANALYSIS
(2024)
Review
Crystallography
Soham Mukherjee, Joysurya Basu, Rajiv Kumar Mandal
Summary: Structural transformations in the solid state play a crucial role in the operation of engineering materials. Advanced characterization techniques, such as electron microscopy, have greatly enhanced our understanding of these transformations, particularly in metallic systems like titanium alloys. This article focuses on the formation of various phases in titanium alloys, including solid solution phases, intermetallic phases, quasicrystals, incommensurate structures, and metallic glasses, under different processing conditions. The formation of new phases at the nanoscale is also explored. The importance of studying the properties of nanostructured alloys and the need for a model to understand structural transformations are emphasized. The review concludes by discussing the potential influence of system size on phase formation, using Au-Cu nanostructures as an example.
PROGRESS IN CRYSTAL GROWTH AND CHARACTERIZATION OF MATERIALS
(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
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
Materials Science, Characterization & Testing
Guangzhi Chen, Odile Abraham, Damien Pageot, Olivier Durand, Mathieu Chekroun, Vincent Tournat
Summary: This paper investigates the application of Nonlinear Coda Wave Interferometry (NCWI) method in evaluating the nonlinear interface areas in highly heterogeneous materials. An experimental protocol is proposed and validated through numerical simulation and experimental results. The findings demonstrate that NCWI can be used to quantitatively analyze the nonlinear interface effects in complex media.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Multidisciplinary
Hangyu Yue, Jibang Yang, Kesong Miao, Youxing Yao, Guohua Fan, Feng Zhang, Pei Liu, Hao Wu, Yunlou Wang, Ruifeng Li
Summary: The effect of Y2O3 nanoparticles on the microstructure and high-temperature mechanical properties of Ti-48Al-2Cr-2Nb alloy prepared by directed energy deposition was investigated. The results showed that the addition of Y2O3 nanoparticles improved the microstructure, ultimate tensile strength, and fracture elongation of the TiAl alloy. This study provides important reference for the fabrication and engineering applications of TiAl alloys.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Zhaoxin Zhong, Biao Zhang, Yuhan Ren, Jian Ye, Jiawei Zhang, Feng Ye
Summary: In this study, bioinspired web-liked multiphase composites were successfully constructed using boron-modified polysilazane polymer. The composites consisted of long TiB nanowires as 'web' and hybrid TiC and Ti3Si particles as 'nodes'. The enhanced strength of these composites was attributed to the synergistic load transfer of the hybrid reinforcements. This study provides a promising design approach for developing high-performance composites with high reinforcement content, utilizing polymer instead of traditional ceramic powder.
MATERIALS CHARACTERIZATION
(2024)
Article
Engineering, Mechanical
Majid Khan, Xueqiu He, Jia Guo, Dazhao Song
Summary: This study introduces a non-invasive and cost-effective geophysical workflow for accurate identification and prediction of rockburst in steeply inclined and extremely thick coal seam mines. By conducting passive seismological in-situ observations for twenty-four months, seismic source parameters were computed, fracturing process was mapped, and rockburst-prone regions were identified. The mapped fractures revealed the primary mode of deformation in the minefield. The prediction efficiency of various indicators was compared through conditional probability analysis, and decreasing occurrence frequency of fractures was introduced as a new prediction indicator.
ENGINEERING FAILURE ANALYSIS
(2024)
Review
Engineering, Mechanical
Walaa Abd-Elaziem, Mahmoud Khedr, Ammar. H. Elsheikh, Jingku Liu, Yuxin Zeng, Tamer A. Sebae, Marwa A. Abd El-Baky, Moustafa A. Darwish, Walid M. Daoush, Xiaochun Li
Summary: Light-weight, high-strength metal matrix nanocomposites (MMNCs) have gained popularity in various industrial applications. However, micron-sized composites face challenges such as particle breakage and debonding, limiting their practical use. In contrast, MMNCs have been shown to improve strength, ductility, and fracture toughness, making them suitable for a wide range of industrial applications.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Costin Ilinca
Summary: This paper presents a case study on a gas pipeline rupture, explosion, and subsequent fire, aiming to identify the cause and improve the pipeline's strength under specific conditions. The study conducted stress analysis and measured the pipe's actual wall thickness, highlighting the importance of accurately assessing the structural integrity of buried pipelines and the utility of finite element analysis.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Tao Li, Huaitao Shi, Xiaotian Bai, Ke Zhang, Guangfu Bin
Summary: This paper presents an early failure evolution model for ceramic bearings considering random propagation of subsurface cracks. The model is based on the finite element model reconstructed from fatigue tests and utilizes Monte Carlo Simulation to generate randomness events of crack propagation. The proposed model reveals the sudden failure mechanism of ceramic bearings under uncertain crack propagation and effectively evaluates the performance degradation of critical rotating components using ceramic materials.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Materials Science, Characterization & Testing
Shaun Mcknight, S. Gareth Pierce, Ehsan Mohseni, Christopher Mackinnon, Charles Macleod, Tom 'Hare, Charalampos Loukas
Summary: This work proposes four synthetic data generation methods to address the issue of limited training data in Non-Destructive Ultrasonic Testing. Experimental results demonstrate that these methods significantly improve the classification performance of real experimental images.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
L. Gahleitner, G. Thummerer, G. Mayr, G. Mayr, P. Burgholzer, U. Cakmak
Summary: This study presents a one-dimensional photothermal method using the virtual wave concept to estimate subsurface interface parameters and demonstrates its application in layered materials. Experimental results validate the accurate estimation of interfacial parameters for the analyzed samples.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Pengxiang Ji, Yiming Jiang, Ruobing Zhao, Jing Zou
Summary: Computed laminography (CL) is a non-destructive imaging technique for plate-like samples that has challenges in exact reconstruction. Fusion laminography (FL) combines Fourier information from CL and CT to achieve precise reconstruction, showing superiority in artifact removal and edge preservation, particularly for irregular sample structures.
NDT & E INTERNATIONAL
(2024)
