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Lateral ring compression test applied to a small caliber steel jacket:Identification of a constitutive model

Defence Technology（防务技术） 2024年第6期36卷 133-148页

作者： Yann Coget Yael Demarty Christophe Czarnota Anthony Bracq Jean-Sebastien Brest Alexis Rusinek French-German Research Institute of Saint-Louis 5 Rue Du General Cassagnou68300 Saint-LouisFrance laboratoire d'etude des Microstructures et de Mecanique des Materiaux(LEM3) CNRSUniversite de LorraineArts&Metiers ParisTechF-57000 MetzFrance

The evolution of threats and scenarios requires continuous performance improvements of ballistic protections for armed *** a modeling point of view,it is necessary to use sufficiently precise material behavior models to accurately describe the phenomena observed during the impact of a projectile on a protective *** this context,the goal of this paper is to characterize the behavior of a small caliber steel jacket by combining experimental and numerical *** experimental method is based on the lateral compression of ring specimens directly machined from the thin and small *** speeds and temperatures are considered in a quasi-static regime in order to reveal the strain rate and temperature dependencies of the tested *** Finite Element Updating Method(FEMU)is *** results are coupled with an inverse optimization method and a finite element numerical model in order to determine the parameters of a constitutive model representative of the jacket *** of the present model are verified against experimental results and a parametric study as well as a discussion on the identified material parameters are *** results indicate that the strain hardening parameter can be neglected and the behavior of the thin steel jacket can be described by a modeling without strain hardening sensitivity.

关键词： Full metal jacket ammunition Lateral ring compression Inverse identification Numerical simulation

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Recent progress in augmenting turbulence models with physics-informed machine learning

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Journal of Hydrodynamics 2019年第6期31卷 1153-1158页

作者： Xinlei Zhang Jinlong Wu Olivier Coutier-Delgosha Heng Xiao Kevin T.Crofton Department of Aerospace and Ocean Engineering Virginia TechBlacksburgVirginiaUSA laboratoire de Mecanique des Fluides de Lille一Kampe de Feriet Arts et Metiers ParisTechLilleFrance

In view of the long stagnation in traditional turbulence modeling,researchers have attempted using machine learning to augment turbulence *** paper presents some of the recent progresses in our group on augmenting turbulence models with physics-informed machine *** also discuss our works on ensemble-based field inversion to provide training data for constructing machine learning *** and on-going research efforts are introduced.

关键词： Machine learning turbulence modeling data-driven modeling model uncertainty

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Ultrasonic fatigue tests at high temperature on an austenitic steel

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Propulsion and Power Research 2012年第1期1卷 29-35页

作者： D.Wagner F.J.Cavalieri C.Bathias N.Ranc laboratoire Energetique Mecanique Electromagnetisme Universite Paris Ouest92410 Ville D’AvrayFrance LMSP Arts et Metiers-ParisTech75013 ParisFrance

The objective of this paper is to study the gigacycle fatigue behavior of an austenitic steel at temperatures of 6001C and 700℃under fully reverse loading(R=-1).Numerical simulation by finite element method(FEM)was used to design the specimens and to analyze the effects of the variation in the dynamic Young modulus with temperature from measurements of the ultrasonic resonance ***,new stress-life curves for this material are presented for a lifetime range from 10^(5)to 10^(9)cycles at room temperature,600℃and 700℃.

关键词： Fatigue Gigacycle regime High temperature Austenitic steel Finite element method Crack initiation mechanism

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含缺陷压铸AlSi9Cu3合金疲劳寿命的计算

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稀有金属 2018年第8期42卷 791-798页

作者：陈颖张峥 Franck Morel 北京航空航天大学材料科学与工程学院北京100191 arts et metiers paristech laboratoire lampa Angers France 49035

研究压铸铝合金AlSi9Cu3基体中铸造缺陷和疲劳寿命的关系有望实现铝合金疲劳寿命的预测，具有较大的工程实用价值。采用Paris公式可以对含缺陷铝合金的疲劳寿命进行计算。然而在现有报道中，缺陷类型对合金疲劳寿命的影响被忽略，导致... 详细信息

研究压铸铝合金AlSi9Cu3基体中铸造缺陷和疲劳寿命的关系有望实现铝合金疲劳寿命的预测，具有较大的工程实用价值。采用Paris公式可以对含缺陷铝合金的疲劳寿命进行计算。然而在现有报道中，缺陷类型对合金疲劳寿命的影响被忽略，导致计算的准确性降低。本文在对含缺陷压铸AlSi9Cu3铝合金试样的疲劳寿命测试的基础上，通过引入缺陷类型的几何因子对Paris公式进行修正，提高了其计算精度。首先，通过对试样进行疲劳实验和断口分析，明确了合金中主要包括3种裂纹：穿透裂纹、表面裂纹和角裂纹。其次，采用公式计算得到穿透裂纹、表面裂纹和角裂纹的平均几何因子分别为1．421，0．814和0．947，其中穿透裂纹对疲劳寿命的影响最大。在此基础上，采用Paris-Erdogan公式对铝合金的疲劳寿命进行了计算，计算疲劳寿命与实验疲劳寿命结果相吻合，计算误差在一倍以内，证实了假设的合理性和计算的可行性。该计算可以在实际应用中为含缺陷铝合金寿命的预测提供重要的理论基础和实际参考。

关键词：压铸铝合金几何因子 Paris公式疲劳寿命计算

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Tonal Noise Prediction of an Automotive Engine Cooling Fan： Comparison between Analytical Models and Acoustic Analogy Results

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Journal of Mechanics Engineering and Automation 2012年第7期2卷 455-463页

作者： Elias Tannoury Sofiane Khelladi Bruno Demory Manuel Henner Farid Bakir Valeo Thermal Systems La Verriere 78321 France laboratoire de Dynamique des Fluides Arts et Metiers ParisTech Paris 75013 France

Valeo, involved in engine cooling fan system design for many years, is interested in noise prediction tools for axial fans. Thus, this paper describes a two-part study of tonal noise computation. The first part deals with the prediction of tonal noise using analytical models. As for the second part, it describes a hybrid approach for predicting tonal noise where the sources are extracted from an Unsteady Reynolds-Averaged Naviers-Stocks （URANS） simulation and then propagated into the far, free field using the Ffowcs Williams and Hawkings＇ acoustic analogy. The computational domain is meshed with 46 million polyhedral elements and the simulation takes into account the exact geometry of the rotor blades, the stator blades and the shroud. The results from the first part show that analytical models can be used for comparisons between different fan geometries, but are unable to provide accurate noise predictions compared to experimental results. The simulation shows non-periodic blade loading over a whole fan revolution, and different blade loading between the blades. This introduces some bias in the assessment of the acoustic performance of the fan. Overall, the results from the hybrid method are in accordance with the experimental results.

关键词： Aeroacoustics axial fan tonal noise.

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Effect of sintering temperature on structure and tribological properties of nanostructured Ti-15Mo alloy for biomedical applications

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Transactions of Nonferrous Metals Society of China 2019年第11期29卷 2310-2320页

作者： Mamoun FELLAH Naouel HEZIL Dekhil LEILA Mohammed ABDUL SAMAD Ridha DJELLABI Stephania KOSMAN Alex MONTAGNE Alain IOST Aleksei OBROSOV Sabine WEISS Mechanical Engineering Department ABBES Laghrour-UniversityKhenchelaP.O.125240004Algeria Tribology and Materials Group Laboratory of FoundryBadji Mokhtar UniversityAnnabaB.O.12 CP 23000Algeria Mater Sciences Department ABBES Laghrour-UniversityKhenchelaP.O.125240004Algeria laboratoire de Mise en forme des Matériaux Métalliques(LMF2M) UniversitéBadji—MokhtarB.P.1223000 AnnabaAlgeria Mechanical Engineering Department King Fahd University of Petroleum and MineralsBox 1180Dhahran 31261KSA Department of Environmental Engineering College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518055China arts et metiers paristech MSMP8Boulevard Louis XIV59046 Lille CedexFrance Department of Physical Metallurgy and Materials Technology Brandenburg Technical University03046 CottbusGermany

The effect of sintering temperature(1073?1373 K)on the structural and tribological properties of nanostructured ballmilledβ-type Ti?15Mo samples was *** prepared samples were characterized using various apperatus such as X-ray diffractometer,scanning electron microscope(SEM)and ball-on-plate type oscillating *** tests were conducted under different applied loads(2,8 and 16 N).Structural results showed that the mean pore and crystallite size continuously decreased with increasing sintering temperature to reach the lowest values of 4 nm and 29 nm at 1373 K,*** relative density of the sintered sample at 1373 K was as high as 97.0%.Moreover,a higher sintering temperature resulted in higher relative density,greater hardness and elastic modulus of the *** was observed that both the friction coefficient and wear rate were lower in the sample sintered at 1373 K which was attributed to the closed porosity.

关键词： Ti-15Mo wear tribological behaviour nanotribology sintering biomedical applications

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