Materials Research Proceedings最新文献_第10页

Improvement of the surface quality of titanium-based design objects produced through WAAM technology using chemical machining: A preliminary study 利用化学加工技术改进通过 WAAM 技术生产的钛基设计对象的表面质量：初步研究

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-35

A. Perna

{"title":"Improvement of the surface quality of titanium-based design objects produced through WAAM technology using chemical machining: A preliminary study","authors":"A. Perna","doi":"10.21741/9781644903131-35","DOIUrl":"https://doi.org/10.21741/9781644903131-35","url":null,"abstract":"Abstract. The quality of the surface is one of the most important factors in the fabrication of a component via additive manufacturing (AM). In particular, when considering the manufacture of workpieces in titanium and its alloys the successful use of surface treatments is essential. In fact, many fracture-related events, in particular fatigue cracks, start near the surface of the component. Numerous techniques based on machining, shot peening, or laser polishing have been proposed to enhance the surface quality. The limitations of these treatments stem from the challenges posed by focusing on complex form components. One of the most promising approaches for achieving homogenous smoothing of intricate objects with internal channels and lattice structure continues to be chemical-based surface treatments. It is a pivotal method to remove material that has been polluted by oxygen during processing. In this instance, the resistance to crack initiation and fracture is fundamentally improved by the removal of a hard, brittle top layer. In this work, HF/HNO3-based treatment tailored for 3D printed design products is presented.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"7 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974431","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

Utilizing thermal imaging for non-destructive thermoformability assessment in vacuum-air pressure thermoforming of plastic-coated paperboards 利用热成像技术对涂塑纸板的真空-气压热成型进行无损热成型性评估

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-282

Sanaz Afshariantorghabeh

引用次数: 0

A robust identification protocol of flow curve adjusting parameters using uniaxial tensile curve 利用单轴拉伸曲线对流量曲线调整参数进行稳健识别的方案

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-243

Xavier Lemoine

{"title":"A robust identification protocol of flow curve adjusting parameters using uniaxial tensile curve","authors":"Xavier Lemoine","doi":"10.21741/9781644903131-243","DOIUrl":"https://doi.org/10.21741/9781644903131-243","url":null,"abstract":"Abstract. ArcelorMittal is constantly developing new steel grades to enable the automotive industry to offer safer, lighter, and more environmentally friendly vehicles. These new grades include advanced high-strength steels (AHSS) and Ultra High Strength steels (UHSS) having for some of them lower uniform elongation (UE) than conventional drawing steels. This particularity needs to be considered for an accurate formability prediction in sheet forming numerical simulations. One of these difficulties is the effect of the relatively low uniform elongation on the identification of the parameters of the isotropic hardening model. Various experimental tests can be used to reach the large plastic deformation (hydraulic bulge test, stack compression test, shear test, torsion test or plane strain compression test). The identification protocol of ArcelorMittal for hardening models is based solely on stress-strain curves determined in uniaxial tension. The Exp_S hardening law (TU experimental values before UE%, Swift extension above) was validated by comparison with the stress-strain curves obtained from measurements of experimental tests reaching large strains.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"19 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140971668","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

Enhanced formability in two-step forming for AA7075 sheet in -T6 and -W tempers 提高 AA7075 板材在 -T6 和 -W 两种温度下的两步成形性

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-136

Jinjin Ha

引用次数: 0

Experimental, analytical, and numerical analysis of the copper wire multi-pass drawing process 铜线多道拉拔工艺的实验、分析和数值分析

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-82

S. Di Donato

{"title":"Experimental, analytical, and numerical analysis of the copper wire multi-pass drawing process","authors":"S. Di Donato","doi":"10.21741/9781644903131-82","DOIUrl":"https://doi.org/10.21741/9781644903131-82","url":null,"abstract":"Abstract. In the cold wire drawing process, the stress acting on the wire depends on process parameters, as well as on the material flow stress, including the strain-hardening that occurs step by step. It is essential to ensure that the stress applied to the wire at the exit of the die remains below the material's yield stress, to prevent wire necking and fracture. Industrially, the process is carried out continuously using multi-step-multi-wires machines that deform the material to high strain at elevated strain rate values. The application of analytical models for evaluating the stresses acting on the wire assumes simplified boundary conditions, such as an average distribution of strain and strain rate within the die. Further studies are necessary, considering the entire multi-pass industrial case and involving finite element simulation, which is today the main tool for optimizing industrial processes. In this work, the drawing process applied to ETP Pure Copper (99.9% in weight) is analyzed experimentally, analytically, and numerically. The material was characterized by torsion tests and experimental drawing tests were carried out on four steps of the process. Through the analysis of the different analytical methods, it was shown that a careful evaluation of the friction coefficient values is necessary to reduce errors in estimating the drawing forces. The aim is to provide a reliable numerical model for predicting the stress acting on the wire during the multi-pass drawing process, through an appropriate characterization of the material flow stress and an evaluation of the friction model.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"88 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973190","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

Digital image processing algorithm for industrial on-site roughness evaluation in Ti-alloy machining 用于钛合金加工中工业现场粗糙度评估的数字图像处理算法

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-219

Sílvia Daniela RIBEIRO CARVALHO

引用次数: 0

Potential of near-surface temperature regulation in hybrid additive manufactured forging dies 混合添加剂制造锻造模具近表面温度调节的潜力

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-97

J. Peddinghaus

{"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}

引用次数: 0

Considering the viscoelastic material behavior in a solid-shell element for thermoforming simulation 在用于热成型模拟的固壳元素中考虑粘弹性材料行为

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-51

Johannes Mitsch

{"title":"Considering the viscoelastic material behavior in a solid-shell element for thermoforming simulation","authors":"Johannes Mitsch","doi":"10.21741/9781644903131-51","DOIUrl":"https://doi.org/10.21741/9781644903131-51","url":null,"abstract":"Abstract. To predict manufacturing effects in the thermoforming process for fiber reinforced plastics the Finite Element Method is widely used. Most macroscopic simulation methods are based on conventional two-dimensional shell elements which are not capable of modeling the material behavior in thickness direction using constitutive equations. At the same time, standard three-dimensional element formulations are not suitable for the forming simulation of thin textiles due to numerical locking phenomena and the lack of a possible membrane-bending-decoupling. Previous studies focused on a specialized solid-shell element formulation which provides anisotropic but purely elastic material modeling. Since purely elastic approaches cannot accurately describe the deformation behavior in the thermoforming process, the provided element formulation is enhanced to rate-dependent viscoelastic material modeling. Numerical studies are carried out that reveal that the membrane-bending-decoupling is preserved for the viscoelastic material model. Virtual coupon tests demonstrate the rate-dependent material behavior in the solid-shell element. The obtained results show that the general approach of the viscoelastic material behavior within the solid-shell element is suitable to address out-of-plane phenomena in thermoforming simulations.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"44 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975749","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

Investigations of strain rate sensitivity under different stress triaxialities for DC04 不同三轴应力下 DC04 应变率敏感性研究

Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-234

Lorenz Maier

{"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}

引用次数: 0