Pub Date : 2024-05-15DOI: 10.21741/9781644903131-41
H. Vanhove
Abstract. Making threaded connections to thin metal sheets requires locally thickening of the sheet in order to provide enough thread length for a structurally sound connection. Shaped Metal Deposition processes like Gas Tungsten Arc Welding (GTAW) allow to locally build-up material in order to provide thickness for a sufficient length of thread engagement. This publication describes the research towards local thickening of a titanium sheet by means of pulsed Tungsten Inert Gas (TIG) droplet deposition, aimed at creating threaded holes for thin shelled bone fracture fixation plates. The influence of current, weld time and amount of filler material on droplet diameter and height is studied.
{"title":"Local reinforcement of titanium sheet by means of GTAW droplet deposition for threaded connections","authors":"H. Vanhove","doi":"10.21741/9781644903131-41","DOIUrl":"https://doi.org/10.21741/9781644903131-41","url":null,"abstract":"Abstract. Making threaded connections to thin metal sheets requires locally thickening of the sheet in order to provide enough thread length for a structurally sound connection. Shaped Metal Deposition processes like Gas Tungsten Arc Welding (GTAW) allow to locally build-up material in order to provide thickness for a sufficient length of thread engagement. This publication describes the research towards local thickening of a titanium sheet by means of pulsed Tungsten Inert Gas (TIG) droplet deposition, aimed at creating threaded holes for thin shelled bone fracture fixation plates. The influence of current, weld time and amount of filler material on droplet diameter and height is studied.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"67 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140971926","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: 10.21741/9781644903131-136
Jinjin Ha
Abstract. In response to stringent environmental regulations, the automotive industry is increasingly prioritizing lightweighting, prompting a shift towards high-strength aluminum alloys while the low formability of these alloys remain a limiting factor. This study explores a solution through a two-step forming process applied to AA7075 sheets utilizing -T6 and -W tempers. Firstly, two-step uniaxial tension experiments are performed at two prestraining levels in the -T6 temper followed by subsequent tensions in the -W. Both cases exhibit significant plastic deformation before fracture, overcoming the thinning accumulated in the first step. Additionally, a two-step hole expansion experiment is conducted under the same tempering conditions. Results are compared with single operations in each temper, evaluating force-displacement curves and thickness strain distribution around the hole. The study highlights the substantial contribution to formability enhancement, demonstrating 80% higher cup height and twice greater thinning to fracture compared to conventional single-step operations.
{"title":"Enhanced formability in two-step forming for AA7075 sheet in -T6 and -W tempers","authors":"Jinjin Ha","doi":"10.21741/9781644903131-136","DOIUrl":"https://doi.org/10.21741/9781644903131-136","url":null,"abstract":"Abstract. In response to stringent environmental regulations, the automotive industry is increasingly prioritizing lightweighting, prompting a shift towards high-strength aluminum alloys while the low formability of these alloys remain a limiting factor. This study explores a solution through a two-step forming process applied to AA7075 sheets utilizing -T6 and -W tempers. Firstly, two-step uniaxial tension experiments are performed at two prestraining levels in the -T6 temper followed by subsequent tensions in the -W. Both cases exhibit significant plastic deformation before fracture, overcoming the thinning accumulated in the first step. Additionally, a two-step hole expansion experiment is conducted under the same tempering conditions. Results are compared with single operations in each temper, evaluating force-displacement curves and thickness strain distribution around the hole. The study highlights the substantial contribution to formability enhancement, demonstrating 80% higher cup height and twice greater thinning to fracture compared to conventional single-step operations.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"63 42","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972299","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: 10.21741/9781644903131-229
Camille Favier
Abstract. The simulation of machining process is an essential tool in the digitalization of the entire production chain. Currently, these simulations are not sufficiently precise to avoid the use of experimental tests in order to optimize machining operations and guarantee the quality of the machined parts. Some parameters, such as tool-chip contact length, are still underestimated, although they are critical for controlling heat transfer into the tool and implicitly its wear. In order to validate a numerical cutting simulation model, the tool-chip contact length experimentally measured should be used as a comparative quantity, in the same way as the cutting forces and the morphology of the chips is currently used. The objective of this paper is to propose an automation of tool-chip contact length measurements using image processing algorithms. The proposed algorithm was able to identify and measure the tool-chip contact length on more that 75% of images. The algorithm accuracy is evaluated by comparing computed and manually measured tool-chip contact length, for different cutting conditions. It was found that it overestimates the contact length, especially in the case where the image quality is lower.
{"title":"Applying images processing methods for automation measurement of tool-chip contact length in orthogonal cutting","authors":"Camille Favier","doi":"10.21741/9781644903131-229","DOIUrl":"https://doi.org/10.21741/9781644903131-229","url":null,"abstract":"Abstract. The simulation of machining process is an essential tool in the digitalization of the entire production chain. Currently, these simulations are not sufficiently precise to avoid the use of experimental tests in order to optimize machining operations and guarantee the quality of the machined parts. Some parameters, such as tool-chip contact length, are still underestimated, although they are critical for controlling heat transfer into the tool and implicitly its wear. In order to validate a numerical cutting simulation model, the tool-chip contact length experimentally measured should be used as a comparative quantity, in the same way as the cutting forces and the morphology of the chips is currently used. The objective of this paper is to propose an automation of tool-chip contact length measurements using image processing algorithms. The proposed algorithm was able to identify and measure the tool-chip contact length on more that 75% of images. The algorithm accuracy is evaluated by comparing computed and manually measured tool-chip contact length, for different cutting conditions. It was found that it overestimates the contact length, especially in the case where the image quality is lower.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"51 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972556","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: 10.21741/9781644903131-24
E. Saggionetto
Abstract. Laser Powder Bed Fusion (LPBF) of metallic alloys allows to achieve complex shape parts with innovative properties. However, the commercial availability of powder for LPBF is still limited, thus restraining the development of new alloys. To overcome this shortcoming, mixing different powders allows to tailor the chemical composition, although affecting the LPBF process. Indeed, to achieve a fully dense and defect-free part a proper melt pool must be generated during the LPBF process, in order to ensure good overlapping between each track and layer. Melt pools can be described as conductive or key-hole like, promoting the appearance of process-induced defects such as lack of fusion or key-hole porosities. Processing a mixture of several powders by changing the amount of one constituent can affect the type of melt pool generated during the process, thus shifting the process map. In this work, AISI S2 tool steel powders are enriched with 5 and 10% (in volume) of Silicon Carbide (SiC) and processed by LPBF. The effect of SiC on the processability is discussed for different volumetric energy density (Ed). Defects within cross sections are characterized and quantified, as well as the melt pool depth and morphology.
{"title":"Effect of SiC addition on processability of AISI S2 tool steel for laser powder bed fusion","authors":"E. Saggionetto","doi":"10.21741/9781644903131-24","DOIUrl":"https://doi.org/10.21741/9781644903131-24","url":null,"abstract":"Abstract. Laser Powder Bed Fusion (LPBF) of metallic alloys allows to achieve complex shape parts with innovative properties. However, the commercial availability of powder for LPBF is still limited, thus restraining the development of new alloys. To overcome this shortcoming, mixing different powders allows to tailor the chemical composition, although affecting the LPBF process. Indeed, to achieve a fully dense and defect-free part a proper melt pool must be generated during the LPBF process, in order to ensure good overlapping between each track and layer. Melt pools can be described as conductive or key-hole like, promoting the appearance of process-induced defects such as lack of fusion or key-hole porosities. Processing a mixture of several powders by changing the amount of one constituent can affect the type of melt pool generated during the process, thus shifting the process map. In this work, AISI S2 tool steel powders are enriched with 5 and 10% (in volume) of Silicon Carbide (SiC) and processed by LPBF. The effect of SiC on the processability is discussed for different volumetric energy density (Ed). Defects within cross sections are characterized and quantified, as well as the melt pool depth and morphology.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"48 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973164","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: 10.21741/9781644903131-272
R. Tran
Abstract. Technical ceramics such as alumina with its temperature stability, high mechanical stiffness, and good dielectric strength at low density, meet the requirements for highly resilient components for promising markets of high-performance electronics and the electrification of mobility. Ceramic components are usually manufactured using powder technology processes since forming of sintered ceramics is not possible due to the lack of plasticity. In this work, we use hydroforming to shape thermoplastic ceramic green tapes prior to sintering to add a third dimension to flat substrates. We developed alumina feedstocks based on a polyamide binder system that were extruded to 1 mm thick tapes, hydroformed, debinded and sintered. Depending on the binder composition, forming temperatures of 45-60 °C were sufficient, whereby precise temperature control was crucial for success. As a result, components with forming depths of up to 5 mm were produced without defects. This process offers the potential to revolutionize this market segment, not only in terms of geometric design freedom and low material waste, but also in terms of profitability of mass production.
{"title":"Investigations on the production and forming of thermoplastic ceramic green tapes","authors":"R. Tran","doi":"10.21741/9781644903131-272","DOIUrl":"https://doi.org/10.21741/9781644903131-272","url":null,"abstract":"Abstract. Technical ceramics such as alumina with its temperature stability, high mechanical stiffness, and good dielectric strength at low density, meet the requirements for highly resilient components for promising markets of high-performance electronics and the electrification of mobility. Ceramic components are usually manufactured using powder technology processes since forming of sintered ceramics is not possible due to the lack of plasticity. In this work, we use hydroforming to shape thermoplastic ceramic green tapes prior to sintering to add a third dimension to flat substrates. We developed alumina feedstocks based on a polyamide binder system that were extruded to 1 mm thick tapes, hydroformed, debinded and sintered. Depending on the binder composition, forming temperatures of 45-60 °C were sufficient, whereby precise temperature control was crucial for success. As a result, components with forming depths of up to 5 mm were produced without defects. This process offers the potential to revolutionize this market segment, not only in terms of geometric design freedom and low material waste, but also in terms of profitability of mass production.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"67 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973539","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: 10.21741/9781644903131-62
A. Gambardella
Abstract. The evolution of composite component production has been driven by a constant quest for improvements in process efficiency, precision, and repeatability. The eventual transition from traditional hand layup to robotic layup represents a significant step in this evolution. The implementation of robotic layup systems has become increasingly prevalent in the manufacturing industry, particularly in the aerospace and automotive sectors, where lightweight, strength, and precision are mandatory requirements. Ideally, the goal is the development of processes where a highly precise robotic arm could automate the deposition of composite materials onto the mold, providing a certain reduction of human errors, and minimizing material waste and associated costs. In this context, this paper proposes a computational tool that is able to provide automatic layup planning for the robotic layup process. The implemented algorithm incorporates the knowledge of a professional laminator: it can automatically analyze a generic mold surface of complex shape, work out the correct strategies for lamination, and generate instructions for robot movements.
{"title":"Automatic planning strategy for robotic lay-up of prepregs on a complex-shaped mold","authors":"A. Gambardella","doi":"10.21741/9781644903131-62","DOIUrl":"https://doi.org/10.21741/9781644903131-62","url":null,"abstract":"Abstract. The evolution of composite component production has been driven by a constant quest for improvements in process efficiency, precision, and repeatability. The eventual transition from traditional hand layup to robotic layup represents a significant step in this evolution. The implementation of robotic layup systems has become increasingly prevalent in the manufacturing industry, particularly in the aerospace and automotive sectors, where lightweight, strength, and precision are mandatory requirements. Ideally, the goal is the development of processes where a highly precise robotic arm could automate the deposition of composite materials onto the mold, providing a certain reduction of human errors, and minimizing material waste and associated costs. In this context, this paper proposes a computational tool that is able to provide automatic layup planning for the robotic layup process. The implemented algorithm incorporates the knowledge of a professional laminator: it can automatically analyze a generic mold surface of complex shape, work out the correct strategies for lamination, and generate instructions for robot movements.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"58 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974499","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: 10.21741/9781644903131-19
Marcin Madej
Abstract. Additive manufacturing techniques are increasingly being utilized in industrial-level applications due to their flexibility and ability to produce customized parts, such as various types of biomedical implants. However, the conditions during additive manufacturing fabrication and the nature of these processes can lead to implications on the properties of the produced parts, potentially requiring appropriate post-processing before real applications. The tribological behavior of printed parts not only affects their performance but also their service life, making it crucial to investigate their wear rate and friction coefficient under different lubricant environments. In this study, an experimental investigation was conducted on as-printed Ti-6Al-4V specimens to determine the effect of various lubricant environments on wear rate and friction coefficient. The results demonstrated that the reduction in wear rate in liquid environments can be significantly hindered by the accumulation of debris from the worn specimen. However, the development of a thin film of an appropriate lubricant was shown to be favorable regarding the friction behavior of printed parts.
{"title":"An experimental investigation into tribological behaviour of additively manufactured biocompatible Ti-6Al-4V alloy","authors":"Marcin Madej","doi":"10.21741/9781644903131-19","DOIUrl":"https://doi.org/10.21741/9781644903131-19","url":null,"abstract":"Abstract. Additive manufacturing techniques are increasingly being utilized in industrial-level applications due to their flexibility and ability to produce customized parts, such as various types of biomedical implants. However, the conditions during additive manufacturing fabrication and the nature of these processes can lead to implications on the properties of the produced parts, potentially requiring appropriate post-processing before real applications. The tribological behavior of printed parts not only affects their performance but also their service life, making it crucial to investigate their wear rate and friction coefficient under different lubricant environments. In this study, an experimental investigation was conducted on as-printed Ti-6Al-4V specimens to determine the effect of various lubricant environments on wear rate and friction coefficient. The results demonstrated that the reduction in wear rate in liquid environments can be significantly hindered by the accumulation of debris from the worn specimen. However, the development of a thin film of an appropriate lubricant was shown to be favorable regarding the friction behavior of printed parts.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"6 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975093","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: 10.21741/9781644903131-97
J. Peddinghaus
Abstract. Recent advances in the field of additive manufacturing (AM) have enabled the utilisation of Laser Powder Bed Fusion (L-PBF) for tool steels under high load conditions. Design elements, such as internal cooling channels, which are not achievable through subtractive manufacturing can therefore be used to functionalise and optimise hot forging tools. Thermal control is crucial for hot forging dies as the performance and endurance of the tools is highly dependent on the input and dissipation of heat in the surface zone during forging. A modified forging tool with conformal internal cooling channels generated through a hybrid L-PBF manufacturing process was developed in prior work [1]. The objective in the presented research is the experimental evaluation of the effect of conformal temperature control in the novel tool concept on the temperature dependent tool deterioration mechanisms in forging conditions. The actively controlled water temperature was varied between room temperature for maximum cooling and 180 °C, representing an exemplary base temperature in steady state serial forging. After 1,000 cycles, the tool wear conditions are analysed optically and through destructive microstructure analysis to characterise the effect of the temperature management on the deterioration mechanisms. The results show a significant impact of subsurface temperature control on the wear mechanisms of forging dies. Abrasive wear can be limited to a minimum through internal cooling with major reduction in thermal loads. Increased base temperatures reduce run-in time but increase abrasion.
摘要。增材制造（AM）领域的最新进展使激光粉末床熔融（L-PBF）技术得以在高负荷条件下用于工具钢。因此，减材制造无法实现的内部冷却通道等设计元素可用于热锻模具的功能化和优化。热控制对热锻模具至关重要，因为模具的性能和耐久性在很大程度上取决于锻造过程中表面区域的热量输入和散失。之前的研究[1]开发了一种改进型锻造工具，通过混合 L-PBF 制造工艺产生保形内部冷却通道。本研究的目标是通过实验评估新型工具概念中的保形温度控制对锻造条件下与温度相关的工具劣化机制的影响。主动控制的水温在室温（最大冷却温度）和 180 °C 之间变化，180 °C 代表稳态连续锻造中的示例基准温度。经过 1,000 次循环后，通过光学分析和破坏性微结构分析对工具磨损状况进行分析，以确定温度管理对劣化机制的影响。结果表明，表面下温度控制对锻造模具的磨损机制有重大影响。通过内部冷却可将磨料磨损限制到最低程度，同时大大降低热负荷。基础温度升高会缩短磨合时间，但会增加磨损。
{"title":"Potential of near-surface temperature regulation in hybrid additive manufactured forging dies","authors":"J. Peddinghaus","doi":"10.21741/9781644903131-97","DOIUrl":"https://doi.org/10.21741/9781644903131-97","url":null,"abstract":"Abstract. Recent advances in the field of additive manufacturing (AM) have enabled the utilisation of Laser Powder Bed Fusion (L-PBF) for tool steels under high load conditions. Design elements, such as internal cooling channels, which are not achievable through subtractive manufacturing can therefore be used to functionalise and optimise hot forging tools. Thermal control is crucial for hot forging dies as the performance and endurance of the tools is highly dependent on the input and dissipation of heat in the surface zone during forging. A modified forging tool with conformal internal cooling channels generated through a hybrid L-PBF manufacturing process was developed in prior work [1]. The objective in the presented research is the experimental evaluation of the effect of conformal temperature control in the novel tool concept on the temperature dependent tool deterioration mechanisms in forging conditions. The actively controlled water temperature was varied between room temperature for maximum cooling and 180 °C, representing an exemplary base temperature in steady state serial forging. After 1,000 cycles, the tool wear conditions are analysed optically and through destructive microstructure analysis to characterise the effect of the temperature management on the deterioration mechanisms. The results show a significant impact of subsurface temperature control on the wear mechanisms of forging dies. Abrasive wear can be limited to a minimum through internal cooling with major reduction in thermal loads. Increased base temperatures reduce run-in time but increase abrasion.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"45 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975578","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: 10.21741/9781644903131-142
Cynthia Elhajj
Abstract. This study employs numerical calculations based on the micro-plasto-hydrodynamic lubrication (MPHDL) theory to analyze the evolution of oil pits during the stainless-steel cold rolling process. The model is enhanced by incorporating lubricant temperature variations caused by its contact with the heated roll and strip, as well as variations in pit slope. The findings show the significant impact and relevance of considering these additional parameters in assessing the performance of the MPHDL mechanism. Notably, the model demonstrates good agreement with experimental measurements conducted on a Stainless-Steel grade undergoing multiple passes.
{"title":"Effect of micro-plasto-hydrodynamic lubrication on strip surface in steel cold rolling","authors":"Cynthia Elhajj","doi":"10.21741/9781644903131-142","DOIUrl":"https://doi.org/10.21741/9781644903131-142","url":null,"abstract":"Abstract. This study employs numerical calculations based on the micro-plasto-hydrodynamic lubrication (MPHDL) theory to analyze the evolution of oil pits during the stainless-steel cold rolling process. The model is enhanced by incorporating lubricant temperature variations caused by its contact with the heated roll and strip, as well as variations in pit slope. The findings show the significant impact and relevance of considering these additional parameters in assessing the performance of the MPHDL mechanism. Notably, the model demonstrates good agreement with experimental measurements conducted on a Stainless-Steel grade undergoing multiple passes.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"50 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976482","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: 10.21741/9781644903131-234
Lorenz Maier
Abstract. Understanding the strain rate sensitivity of materials is essential for predicting their behavior in sheet metal forming. While uniaxial tension tests are state of the art in characterizing this sensitivity, the deformation response of materials under different loading conditions can significantly deviate from uniaxial behavior. This paper presents a comprehensive study of the strain rate sensitivity of DC04 through a series of experimental investigations with different strain rates. In addition to uniaxial tension tests, the study investigates the strain rate sensitivity under shear and plane strain tests, providing a comprehensive analysis of strain rate sensitivity across different loading scenarios. The investigation aims to understand how the material responds to varying deformation rates, focusing on characterizing their deformation behavior under various loading conditions. The authors collected experimental data from the material with a DIC system. They analyzed it to derive material-specific parameters that describe their strain rate-dependent responses depending on the stress state. To explain this, the authors calibrated three models: Johnson Cook, Cowper Symonds, and Huh Kang.
{"title":"Investigations of strain rate sensitivity under different stress triaxialities for DC04","authors":"Lorenz Maier","doi":"10.21741/9781644903131-234","DOIUrl":"https://doi.org/10.21741/9781644903131-234","url":null,"abstract":"Abstract. Understanding the strain rate sensitivity of materials is essential for predicting their behavior in sheet metal forming. While uniaxial tension tests are state of the art in characterizing this sensitivity, the deformation response of materials under different loading conditions can significantly deviate from uniaxial behavior. This paper presents a comprehensive study of the strain rate sensitivity of DC04 through a series of experimental investigations with different strain rates. In addition to uniaxial tension tests, the study investigates the strain rate sensitivity under shear and plane strain tests, providing a comprehensive analysis of strain rate sensitivity across different loading scenarios. The investigation aims to understand how the material responds to varying deformation rates, focusing on characterizing their deformation behavior under various loading conditions. The authors collected experimental data from the material with a DIC system. They analyzed it to derive material-specific parameters that describe their strain rate-dependent responses depending on the stress state. To explain this, the authors calibrated three models: Johnson Cook, Cowper Symonds, and Huh Kang.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974334","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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