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From strain to stress using full-field data: Computationally efficient stress reconstruction 利用全场数据从应变到应力：计算效率高的应力重建
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-120
M. Halilovič
{"title":"From strain to stress using full-field data: Computationally efficient stress reconstruction","authors":"M. Halilovič","doi":"10.21741/9781644903131-120","DOIUrl":"https://doi.org/10.21741/9781644903131-120","url":null,"abstract":"Abstract. Conventional stress reconstruction based on full-field strain measurements presents a major computational burden, especially when using standard implicit stress integration methods. This presents a notable challenge for inverse identification methods used to characterize the plasticity of metallic materials, particularly those reliant on stress reconstruction, such as the nonlinear sensitivity-based Virtual Fields Method (VFM). To reduce the computational effort, the full-field strain data are usually spatially and temporally down-sampled. However, for metals subject to nonlinear strain paths, this practice can lead to errors in the resulting stress states and compromise the accuracy of the nonlinear VFM. In this work, we introduce a highly efficient explicit stress reconstruction algorithm to reduce the computational challenges of repeated stress reconstruction which can be utilized in inverse identification methods such as nonlinear VFM.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"18 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization of the temperature profile of PET preform via a 3D modelling of the Infrared Heating and ventilation 通过红外线加热和通风的 3D 建模优化 PET 瓶坯的温度曲线
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-284
Yun-Mei Luo
{"title":"Optimization of the temperature profile of PET preform via a 3D modelling of the Infrared Heating and ventilation","authors":"Yun-Mei Luo","doi":"10.21741/9781644903131-284","DOIUrl":"https://doi.org/10.21741/9781644903131-284","url":null,"abstract":"Abstract. Thermal effect has important influence during the stretch blow moulding (SBM) process of PET bottle. Setting the heating condition in an industrial context is a complex task. A 3D simplified modelling of the heating stage during this process is proposed. In this numerical approach, the radiation source is simulated by using a model for intensity of the incident radiation and the Beer Lambert’s law. On the other hand, the ventilation effect under industrial condition is taken into account by a modelling of the forced convection around a cylinder. The IR flux and ventilation effects are implemented as thermal boundary conditions in COMSOL for a 3D computation of the thermal problem for the preform only. Based on this simplified approach to achieve quickly the numerical simulation of the preform heating, an optimization procedure is proposed to adjust the settings of the infrared lamps by comparing our simulation results to the target temperature profile. This optimization tool provides quickly a first set of parameters to help industrial to obtain the desired temperature profile.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"84 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of the cross-section moment in air-bending 空气弯曲中横截面力矩的发展
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-113
A-.P. Pokka
{"title":"Development of the cross-section moment in air-bending","authors":"A-.P. Pokka","doi":"10.21741/9781644903131-113","DOIUrl":"https://doi.org/10.21741/9781644903131-113","url":null,"abstract":"Abstract. The engineering potential of air-bending as a sheet-metal forming process has been limited by certain challenges related to high-strength steels, strain localization, surface defects, “multi-breakage” and bend shape. The phenomena related to these challenges are not yet fully understood, as the conventional test methods have not provided sufficient data for in-depth analysis of the material behavior in air-bending. In this study, nine thermomechanically rolled steel grades are bent in an air-bending test setup using three different punch radii, and Digital Image Correlation for strain measurement on the outer surface. The development of the cross-section moment is measured from the force-displacement curve. A connection is found between the developments of the cross-section moment, strain distribution and multi-breakage, as well as the strain-hardening properties of the material. The presented results illustrate the potential for predicting bending behavior based on the force-displacement curve, that could be achieved with better understanding of the physics related to the air-bending process.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical process design for the production of a hybrid die made of tool steel X38CrMoV5.3 and inconel 718 生产由工具钢 X38CrMoV5.3 和 inconel 718 制成的混合模具的数值工艺设计
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-89
Janina Siring
{"title":"Numerical process design for the production of a hybrid die made of tool steel X38CrMoV5.3 and inconel 718","authors":"Janina Siring","doi":"10.21741/9781644903131-89","DOIUrl":"https://doi.org/10.21741/9781644903131-89","url":null,"abstract":"Abstract. Dies used in hot forging are subjected to high cyclic thermo-mechanical loads, which lead to die failure. There are various options for increasing the service life of these dies, for example coatings or heat treatments. Another possibility is to adapt the choice of material, which is the focus of this work. For example, the nickel-based alloy Inconel has a higher strength at elevated temperatures compared to tool steel. However, Inconel is difficult to manufacture and has higher material costs. For this reason, a new process design for the production of a hybrid die consisting of Inconel 718 and tool steel X38CrMoV5.3 is presented within this work. To produce the hybrid dies, the two materials are first friction welded and then formed using hot forging. In addition to the numerical process design, experimental tests are also carried out to manufacture such hybrid dies. Furthermore, a numerical parameter study is done to determine the influence of the forging temperature, the forging speed and the initial Inconel thickness on the process parameters. It can be shown that the production of hybrid dies is possible by using the Tailored Forming process chain. The influencing factors investigated change the required press force and also the material distribution of the Inconel in the hybrid die produced. In the future, further experimental tests will be carried out to determine the service life of the hybrid dies.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"11 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Property grading by friction induced and continuous solid-state recycling of aluminium scrap 通过摩擦诱导和连续固态回收废铝实现性能分级
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-305
T. Borgert
{"title":"Property grading by friction induced and continuous solid-state recycling of aluminium scrap","authors":"T. Borgert","doi":"10.21741/9781644903131-305","DOIUrl":"https://doi.org/10.21741/9781644903131-305","url":null,"abstract":"Abstract. Saving energy and reducing emissions in all sectors is essential if the ambitious climate targets of various European countries are to be met. One way of achieving this is to recycle metallic materials, which require a lot of energy to produce, in a way that minimizes the use of energy and resources. The friction-induced solid-state recycling process enables the energy-efficient recycling of what is in theory an endless aluminium semi-finished product through the continuous rotation of the wheel used. The past investigations proved the energy-efficient recycling of new aluminium scrap (powder, foil, chips) to a full semi-finished product with good properties. The continuous character of the process along with the likewise continuous feeding of the material to be recycled enables both mixing and successive processing of different aluminium alloys. For this purpose, the processed four different aluminium alloys are selectively mixed and processed simultaneously, as well as different alloys are processed one after the other to achieve a gradation of properties along the length of the semi-finished product. The recycled semi-finished product is examined regarding die filling, hardness, tensile strength as well as microstructure. The central result of the investigations is the fact that the friction-induced recycling process has different possibilities for grading the properties and microstructure in a wide range.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"47 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Machine learning application for optimization of laser directed energy deposition process for aerospace component rapid prototyping in additive manufacturing 将机器学习应用于优化增材制造中航空航天部件快速成型的激光定向能沉积工艺
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-31
G. Ertugrul
{"title":"Machine learning application for optimization of laser directed energy deposition process for aerospace component rapid prototyping in additive manufacturing","authors":"G. Ertugrul","doi":"10.21741/9781644903131-31","DOIUrl":"https://doi.org/10.21741/9781644903131-31","url":null,"abstract":"Abstract. The paper proposes a methodology for determining the optimal L-DED parameters based on the minimum number planned of L-DED trials. A dataset compiled from planned L-DED experiments was used to train a machine learning model. The algorithm demonstrated a robust ability to predict the output metrics with notable accuracy and proposed a theoretical framework that modeled the complex relationships between the input variables and the resulting critical welding properties for AM. The application of the developed model and its comparison with conventional methods thus offers a methodical approach to determining the optimum process parameters in advance. This is a step towards the development and production of additively manufactured components for future digital twin application in the aerospace industry.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"53 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical modelling of the micro-cutting in the abrasion process with pyramidal indenter 金字塔形压头磨损过程中的微切削数值建模
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-204
Achref Werchfeni
{"title":"Numerical modelling of the micro-cutting in the abrasion process with pyramidal indenter","authors":"Achref Werchfeni","doi":"10.21741/9781644903131-204","DOIUrl":"https://doi.org/10.21741/9781644903131-204","url":null,"abstract":"Abstract. A 3-D finite element model of abrasion process based on a CEL (Coupled Eulerian-Lagrangian) approach was developed. A scratch test on elastic-perfectly plastic materials with a pyramidal indenter was simulated. The influence of the interfacial friction coefficient f, the geometric parameters of the indenter and the cutting conditions on the overall friction coefficient μ were studied. Subsequently, the finite element simulation results were compared with an analytical model. It was found that the µ increases linearly with the friction coefficient f and the attack angle of grit β. The FE model results present a good agreement with the analytical model results.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"38 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Necking detection in stretch-bent materials exhibiting the Portevin-Le Chatelier effect 显示波特文-勒夏特列效应的拉伸弯曲材料中的缩颈检测
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-174
A. J. Martínez-Donaire
{"title":"Necking detection in stretch-bent materials exhibiting the Portevin-Le Chatelier effect","authors":"A. J. Martínez-Donaire","doi":"10.21741/9781644903131-174","DOIUrl":"https://doi.org/10.21741/9781644903131-174","url":null,"abstract":"Abstract. In recent years, there has been increasing societal awareness of the carbon dioxide (CO2) footprint resulting from individual actions and lifestyles. One of the research actions is focused on the development of eco-friendly alloys with more recycled scrap material in order to reduce emissions, but this can also result in greater variability of material properties. In this context, accurately characterizing the formability limits of materials is of paramount importance for optimizing manufacturing processes. Although ISO 12004-2:2008 standard is commonly used for necking detection, recent years have seen time-dependent methods yield more accurate predictions. Nevertheless, in materials exhibiting the Portevin-Le Chatelier (PLC) effect, such as some common lightweight alloys used in automotive and aeronautics, necking detection introduces significant challenges, and even more so when the material is subjected to severe local stretch-bending states. In this work, various necking detection techniques were employed to analyze their capabilities in a series of stretch-bending experiments over a 2.94 mm thick AA5754H11 PLC-driven material.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nano-texturing orientation effect on the piercing behavior of five stacked amorphous electrical steel sheets 纳米纹理取向对五种叠层非晶电工钢片穿孔行为的影响
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-274
Tomomi Shiratori
{"title":"Nano-texturing orientation effect on the piercing behavior of five stacked amorphous electrical steel sheets","authors":"Tomomi Shiratori","doi":"10.21741/9781644903131-274","DOIUrl":"https://doi.org/10.21741/9781644903131-274","url":null,"abstract":"Abstract. Higher efficiency motor becomes an expecting keyword in the sustainable society. The iron core in these motors is fabricated by piercing the amorphous electrical steel sheet with sufficient dimensional accuracy and without defects. However, this material has 2.2 GPa in the tensile strength, no ductility, and over 900 HV in hardness. Furthermore, tool life was limited to be short. In recent years, some new tooling technologies for piercing amorphous electrical steel sheets have been developed to reduce the induced damages into punched sheets．Especially, when using nano-textured tool, the process affected width was more reduced than using the none-textured tools. In the present study, nano-texturing orientation effect on the piercing behavior is investigated and its mechanism is discussed.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"17 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of pre-strain on fracture toughness of 3rd generation advanced high strength steels 预应变对第三代先进高强度钢断裂韧性的影响
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-134
L. Grifé
{"title":"Influence of pre-strain on fracture toughness of 3rd generation advanced high strength steels","authors":"L. Grifé","doi":"10.21741/9781644903131-134","DOIUrl":"https://doi.org/10.21741/9781644903131-134","url":null,"abstract":"Abstract. The present work investigates the influence of pre-strain on the fracture toughness of 3rd Generation Advanced High Strength Steels (AHSS). Specifically, a Carbide Free Bainitic (CFB) and a Quenching and Partitioning (Q&P) steel have been studied, the properties of which are crucial for lightweight vehicle construction. Fracture toughness, which is a key parameter for crash performance applications, is assessed using the Essential Work of Fracture methodology. The study investigates the pre-straining states of uniaxial tension, plane strain, and equibiaxial tension in 1.5 mm Q&P and 1.4 mm CFB sheet-form steels of 1180 MPa tensile strength. Overall, Q&P steel demonstrates superior fracture toughness compared to CFB steel. Remarkably, the specific essential work of fracture (we) remains unaffected by pre-straining across different strain states. Nevertheless, pre-straining exerts a notable influence on the non-essential plastic work (βwp) due to the plastic energy consumed during pre-deformation. These results suggest that pre-strain has little or no influence on the fracture properties of AHSS, which is relevant for the design and manufacturing of high crash-performance and safety-related components.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"121 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140977452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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