Pub Date : 2024-05-15DOI: 10.21741/9781644903131-120
M. Halilovič
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.
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-284
Yun-Mei Luo
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.
摘要热效应在 PET 瓶拉伸吹塑成型（SBM）过程中具有重要影响。在工业环境中设定加热条件是一项复杂的任务。本文提出了该过程中加热阶段的三维简化模型。在这种数值方法中，辐射源通过入射辐射强度模型和比尔-朗伯定律进行模拟。另一方面，通过模拟圆柱体周围的强制对流，考虑了工业条件下的通风效应。红外通量和通风效应在 COMSOL 中作为热边界条件实现，仅用于预成型件热问题的三维计算。基于这种快速实现瓶坯加热数值模拟的简化方法，我们提出了一种优化程序，通过比较模拟结果和目标温度曲线来调整红外灯的设置。该优化工具可快速提供第一组参数，帮助工业部门获得所需的温度曲线。
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-113
A-.P. Pokka
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.
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-89
Janina Siring
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.
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-305
T. Borgert
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.
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-31
G. Ertugrul
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.
摘要本文提出了一种根据计划的 L-DED 试验的最少次数来确定最佳 L-DED 参数的方法。从计划的 L-DED 试验中汇编的数据集被用来训练一个机器学习模型。该算法表现出了强大的预测能力，能准确预测输出指标，并提出了一个理论框架，用于模拟 AM 输入变量和由此产生的关键焊接性能之间的复杂关系。因此，应用所开发的模型并将其与传统方法进行比较，为提前确定最佳工艺参数提供了一种有条不紊的方法。这是为未来航空航天工业数字孪生应用开发和生产增材制造部件迈出的一步。
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-204
Achref Werchfeni
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.
摘要基于 CEL（欧拉-拉格朗日耦合）方法开发了磨损过程的三维有限元模型。模拟了使用金字塔形压头对弹性完全塑性材料进行的划痕试验。研究了界面摩擦系数 f、压头几何参数和切削条件对总体摩擦系数 μ 的影响。随后，将有限元模拟结果与分析模型进行了比较。结果发现，μ 随摩擦系数 f 和磨粒攻击角 β 的增大而线性增大。
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-174
A. J. Martínez-Donaire
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.
摘要近年来，社会对个人行为和生活方式所产生的二氧化碳（CO2）足迹的认识不断提高。研究工作的重点之一是开发使用更多回收废料的环保合金，以减少排放，但这也会导致材料性能的更大变化。在这种情况下，准确表征材料的可成形性极限对于优化制造工艺至关重要。尽管 ISO 12004-2:2008 标准通常用于缩颈检测，但近年来，随时间变化的方法已经产生了更准确的预测结果。然而，对于表现出波特文-勒夏特列（PLC）效应的材料，如汽车和航空领域使用的一些常见轻质合金，颈缩检测带来了巨大的挑战，而当材料处于严重的局部拉伸弯曲状态时，颈缩检测的挑战就更大了。在这项工作中，我们采用了各种颈缩检测技术，在对 2.94 毫米厚的 AA5754H11 PLC 驱动材料进行的一系列拉伸弯曲实验中分析了这些技术的能力。
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-274
Tomomi Shiratori
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.
{"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}
Pub Date : 2024-05-15DOI: 10.21741/9781644903131-134
L. Grifé
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.
{"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}
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