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Experimental evidence on the twisting of incrementally formed polymer sheets by varying the toolpath strategy 通过改变刀具路径策略实现增量成形聚合物片材扭曲的实验证据
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-262
A. Formisano
{"title":"Experimental evidence on the twisting of incrementally formed polymer sheets by varying the toolpath strategy","authors":"A. Formisano","doi":"10.21741/9781644903131-262","DOIUrl":"https://doi.org/10.21741/9781644903131-262","url":null,"abstract":"Abstract. In recent years, polymer sheets have been formed by a relatively innovative technology, born for metals and in line with the layered manufacturing principle of rapid prototyping, the incremental sheet forming. This process guarantees high customization and cost-effectiveness but, at the same time, activates some peculiar defects like the twisting phenomenon. To reduce the risk of twisting and the occurrence of failures, it is preferable to reduce the forming forces and one of the solutions is the choice of opportune toolpath strategies. Concerning this, the present experimental research is along the same lines as recent numerical works of the authors; thermoplastic sheets were worked by incremental forming by varying the toolpath strategy. Following the realization of cone frusta, the forming forces and the deformation of the sheets were monitored, to investigate a toolpath strategy capable of reducing the risk of failures and defects for incrementally formed polymer sheets.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"9 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976420","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
Experimental investigation of heterogeneous mechanical tests 异质机械测试的实验研究
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-193
M. Gonçalves
{"title":"Experimental investigation of heterogeneous mechanical tests","authors":"M. Gonçalves","doi":"10.21741/9781644903131-193","DOIUrl":"https://doi.org/10.21741/9781644903131-193","url":null,"abstract":"Abstract. The virtualization of sheet metal forming processes requires a precise numerical model with an accurate description of the material behavior that is classically obtained by carrying out quasi-homogeneous mechanical tests. However, several alternatives to this time-consuming task are under study. Heterogeneous tests can provide a large quantity of mechanical information in a single experiment and, therefore, their potential needs to be investigated. This work aims to present an advanced mechanical test designed by topology optimization under experimental investigation. A numerical design methodology is described, leading to a specimen geometry that is subjected experimentally to uniaxial tensile loading up to rupture. A dual-phase DP600 steel is used. During the test, the strain field is extracted from the specimen surface using a stereo digital image correlation system, and the richness of the mechanical information is further analyzed.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"5 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976747","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
Constitutive model validity evaluation for MT 2.0 applications MT 2.0 应用的构造模型有效性评估
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-203
Amar Peshave
{"title":"Constitutive model validity evaluation for MT 2.0 applications","authors":"Amar Peshave","doi":"10.21741/9781644903131-203","DOIUrl":"https://doi.org/10.21741/9781644903131-203","url":null,"abstract":"Abstract. This paper demonstrates a methodology to discriminate between the performances of different material models within the framework of Material Testing 2.0, which consists in coupling heterogeneous test configurations, full-field measurements using for instance Digital Image Correlation (DIC) and inverse identification like the Virtual Fields Method (VFM). The methodology relies on using a set of different virtual fields for parameter identification with a selected model, and to evaluate the performance of the model. The paper illustrates this methodology on anisotropic metal plasticity.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"114 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140977966","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
Recent advances in development, characterization and joining of new sustainable materials 新型可持续材料的开发、表征和连接方面的最新进展
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-59
Mariana DOINA BANEA
{"title":"Recent advances in development, characterization and joining of new sustainable materials","authors":"Mariana DOINA BANEA","doi":"10.21741/9781644903131-59","DOIUrl":"https://doi.org/10.21741/9781644903131-59","url":null,"abstract":"Abstract. Nowadays, in order to increase the transport efficiency and reduce fuel consumption and emissions of contaminants, a reduction in weight associated with improved safety performance of the materials in use must be achieved. On the other hand, environmental concern has generated interest in research about new materials aligned with the principles of sustainability. Thus, this need for better performing and ecological structures has resulted in the development of a new variety of materials. Among these materials, currently, are the composites produced from resources of renewable sources. Natural fiber composites have recently attracted a great deal of attention by the industry due to their many attractive benefits (e.g., high strength-to-weight ratio, sustainable characteristics and low cost). Welding is highly impractical to use in these situations (i.e., thermoset polymer composites) and rivets or screws exhibit stress concentrations and offer a low fatigue resistance. Adhesive bonding is usually the preferred method since it allows for greater flexibility in design and is more efficient in mechanical and energy aspects. In this work, recent advances in development, characterization and joining of new sustainable materials, critical challenges and future perspectives are presented. The application of sustainable green composites may further increase in many structural and non-structural applications if their joining behavior is well-known and established.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"123 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140977545","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
On the impact welding of dissimilar alloys for use in multimaterial skeletal fixation devices 多材料骨骼固定装置中使用的异种合金的冲击焊接
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-192
M. Sanguedolce
{"title":"On the impact welding of dissimilar alloys for use in multimaterial skeletal fixation devices","authors":"M. Sanguedolce","doi":"10.21741/9781644903131-192","DOIUrl":"https://doi.org/10.21741/9781644903131-192","url":null,"abstract":"Abstract. Multi-material skeletal fixators appear to be a promising approach to reduce failure due to the high stiffness of standard-of-care fixators. Nevertheless, joining different materials is challenging due to their different properties. High-velocity impact welding, a solid-state welding process, involves the collision of a “flyer” (moving) part with a stationary “target” at very high speed (i.e., hundreds of meters per second). In this paper we present a preliminary experimental campaign to use laser impact welding to join NiTi and Mg alloy Mg-1.2Zn-0.5Ca-0.5Mn (wt%) sheets and the parallel development of a finite element model to allow gathering further insights into the complex phenomena involved in the process. Preliminary results show the deposition of the Mg alloy on NiTi sheets by tuning the joining process conditions and promising results of the numerical model in terms of accordance with experiments: these findings provide the basis for further process optimization, numerical model calibration and the application of a valid protocol for multi-material skeletal fixation devices.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"120 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140977560","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
Effect of different oxide layer shares on the upsetting of titanium aluminide specimens 不同氧化层份额对铝钛试样镦粗的影响
Materials Research Proceedings Pub Date : 2024-05-15 DOI: 10.21741/9781644903131-105
Sebastian Döring
{"title":"Effect of different oxide layer shares on the upsetting of titanium aluminide specimens","authors":"Sebastian Döring","doi":"10.21741/9781644903131-105","DOIUrl":"https://doi.org/10.21741/9781644903131-105","url":null,"abstract":"Abstract. By ball milling in a low-oxygen atmosphere, it was possible to show that titanium aluminides (TiAl) can be processed into components by pressing and sintering in the same atmosphere. The properties (e.g. hardness and density) that can be realised with established processes such as field-assisted sintering (FAST) or hot isostatic pressing (HIP) were not achieved. Pores in the component are closed by forming processes, which improves the mechanical properties. In this work, powder-metallurgically processed TiAl was hot-formed in a low-oxygen atmosphere. The forging parameters and pre-consolidation were characterised with regard to their effect on the component properties. Force, hardness and porosity measurements as well as metallographic analyses were used to evaluate the process and the resulting specimens. It was found that a pre-consolidation and a higher degree of deformation lead to a lower porosity and a higher hardness.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"59 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975305","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
{"title":"Digital image processing algorithm for industrial on-site roughness evaluation in Ti-alloy machining","authors":"Sílvia Daniela RIBEIRO CARVALHO","doi":"10.21741/9781644903131-219","DOIUrl":"https://doi.org/10.21741/9781644903131-219","url":null,"abstract":"Abstract. The surface texture is normally observed after the machining process, but nowadays it is important to use on-site analysis to improve the process automatically via smart processing. This study introduces a contactless roughness inspection method employing digital image processing on Ti6Al4V samples in turning using three different feed. Texture analysis with grey-level co-occurrence matrix (GLCM) extracted features that were correlated with the arithmetic average roughness (Ra), leading to the establishment of predictive models. The study encompassed diverse image testing, incorporating variations in resolution and brightness distributions. It was found that the pixel pair spacing (PPS) in GLCM analysis was influenced by the image resolution and feed rate. The predictive models developed with high-quality images, i.e., higher resolution and better brightness distribution, yielded similar results to those created using lower-quality images.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"64 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973611","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
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
{"title":"Utilizing thermal imaging for non-destructive thermoformability assessment in vacuum-air pressure thermoforming of plastic-coated paperboards","authors":"Sanaz Afshariantorghabeh","doi":"10.21741/9781644903131-282","DOIUrl":"https://doi.org/10.21741/9781644903131-282","url":null,"abstract":"Abstract. This study addressed the limitations of traditional post-production analyses in refining thermoforming operation by employing non-destructive, real-time thermal analysis, specifically employing thermal imaging. The focus was on assessing the thermoformability of plastic-coated paperboards, a recent area of interest in manufacturing. Three paperboards underwent vacuum and air pressure thermoforming, with continuous temperature monitoring. Findings revealed correlations between the temperature distributions, the thermal profiles, and the material shape formability. Direct analysis of the thermal images enabled accurate measurement of contact areas between the mold and material. Furthermore, temperature profiles were closely related to shape profiles, particularly concerning the depth, which might be due to exothermic response of the studied materials during the induced stretching process.","PeriodicalId":515987,"journal":{"name":"Materials Research Proceedings","volume":"58 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975060","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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