Computer Methods in Material Science最新文献

Modelling aspects of laser cladding of bioactive glass coatings on ultrafine-grained titanium substrates 超细晶钛基板上生物活性玻璃涂层激光熔覆的建模方面

Computer Methods in Material Science Pub Date : 2019-11-12 DOI: 10.7494/cmms.2019.3.0637

Szymon Bajda, M. Krzyżanowski

{"title":"Modelling aspects of laser cladding of bioactive glass coatings on ultrafine-grained titanium substrates","authors":"Szymon Bajda, M. Krzyżanowski","doi":"10.7494/cmms.2019.3.0637","DOIUrl":"https://doi.org/10.7494/cmms.2019.3.0637","url":null,"abstract":"Titanium alloys, due to their exceptional mechanical properties and biocompatibility, are commonly used to produce medical implants nowadays. However, the presence of such elements as aluminium and vanadium can be harmful to human health. One of the possible solutions could be replacing the titanium alloys with ultrafine-grained commercially pure titanium (cpTi). The yield and also the ultimate strength of cpTi can exceed 1000 MPa. One of the most promising methods in manufacturing medical implants with improved biological fixation is laser cladding in which bioactive glass coatings are imposed on metallic substrates. The aim of this work is development of a 3D numerical model of the above mentioned additive manufacturing process. The obtained model is able to predict the stress-strain and temperature distributions during the processing. A sequentially coupled finite element (FE) model of laser cladding has been developed by applying element birth and death technique to calculate the transient temperature fields used in the stress analysis. The concentrated volumetric heat source from the laser beam moving along the metal surface has been represented by the Gaussian distribution in the radial and exponential decay in the depth direction. The developed FE based numerical model is capable to support the optimal design of such advanced multi-layered structural materials using the laser cladding technique.","PeriodicalId":401877,"journal":{"name":"Computer Methods in Material Science","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132083900","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: 1

On the Specifics of Modelling of Rotary Forging Processes 关于旋转锻造过程建模的具体问题

Computer Methods in Material Science Pub Date : 2017-01-15 DOI: 10.7494/cmms.2017.1.0571

B. Krishnamurthy, O. Bylya, L. Muir, A. Conway, P. Blackwell

引用次数: 5

On the applicability of JMAK-type models in predicting IN718 microstructural evolution jmak型模型在预测IN718显微组织演变中的适用性

Computer Methods in Material Science Pub Date : 2017-01-15 DOI: 10.7494/cmms.2017.1.0576

N. Stefani, O. Bylya, A. Reshetov, P. Blackwell

{"title":"On the applicability of JMAK-type models in predicting IN718 microstructural evolution","authors":"N. Stefani, O. Bylya, A. Reshetov, P. Blackwell","doi":"10.7494/cmms.2017.1.0576","DOIUrl":"https://doi.org/10.7494/cmms.2017.1.0576","url":null,"abstract":"Nickel-based superalloys are widely used in the aerospace sector for their mechanical properties, which are directly related to the microstructural and physical properties of these materials. JMAK-type models have been applied to this class of superalloys for the prediction of microstructural evolution phenomena such as recrystallisation. However, these models often lack a clear range of applicability. The majority of the successful applications normally address rather idealised processes (relatively slow forging, simple geometry). However, the real-world production environment generally involves complex strain paths and thermal histories. Thus, there arises the question of whether the JMAK-type models can be applied to such cases. This paper’s research focus is to investigate the applicability of JMAK-type models for such processes. To do this, screw press forging of disks was used to validate the in-built JMAK-type model of Inconel 718® available in DEFORMTM. In particular, the applicability of the model was examined using a comparison between the results from simulation and from metallographic analysis. At first, the appropriateness of the JMAK outputs in describing the observed microstructures was investigated and then quantitative results were evaluated. The model’s outputs were found to be insufficient in describing the observed microstructural states and additional parameters were deemed necessary. The model’s predictions ranged from a broadly good match, for which the model could be calibrated with a proposed new methodology, to a qualitative mismatch that highlights the limits of the model’s applicability.","PeriodicalId":401877,"journal":{"name":"Computer Methods in Material Science","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123084049","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: 4

Maximization of the Spectral Gap for Chemical Graphs by means of a Solution to a Mixed Integer Semidefinite Program 用混合整数半定规划求解化学图的谱隙最大化

Computer Methods in Material Science Pub Date : 2016-11-21 DOI: 10.7494/cmms.2016.4.0586

Sona Pavlíková, D. Ševčovič

引用次数: 2

Towards intelligent materials testing with reduced experimental effort for hot forming 实现智能化材料测试，减少热成型实验工作量

Computer Methods in Material Science Pub Date : 1900-01-01 DOI: 10.7494/cmms.2017.1.0574

M. Bambach, Muhammad Imran, J. Buhl, S. Härtel, B. Awiszus

{"title":"Towards intelligent materials testing with reduced experimental effort for hot forming","authors":"M. Bambach, Muhammad Imran, J. Buhl, S. Härtel, B. Awiszus","doi":"10.7494/cmms.2017.1.0574","DOIUrl":"https://doi.org/10.7494/cmms.2017.1.0574","url":null,"abstract":"Hot forming processes are typically used to deform metals to the desired shape at lower forming forces and to control the microstructure. During hot deformation, the microstructure evolves by dynamic recrystallization after certain critical conditions are reached. The final recrystallized grain size controls the post-hot forming mechanical properties of metals and components. To predict the evolution of microstructure and flow stress, various material models were developed and implemented in finite element codes. They require a significant number of material-dependent parameters. Currently, experimental designs with a full-factorial approach for a range of temperature and strain rates are utilized to determine the desired parameters, which involve a huge experimental effort. The aim of this paper is to propose a methodology for parameter identification with reduced experimental effort where progression of testing and data evaluation is parallelized. An iterative, sequential approach is presented which optimizes the new testing conditions based upon preceding experimental conditions. The approach is exemplified for the high-temperature material Alloy-800H, using a material model that allows for accurate predictions of the flow stress. The developed strategy allows to achieve the desired accuracy of the material model by utilizing about a half of test matrix representing a full-factorial design. Hence, an efficient cost- and resource-optimized","PeriodicalId":401877,"journal":{"name":"Computer Methods in Material Science","volume":"453 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123048866","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: 2

Grain size measurement using a semi-automatic calculation tool 采用半自动计算工具进行粒度测量

Computer Methods in Material Science Pub Date : 1900-01-01 DOI: 10.7494/cmms.2023.1.0803

F. Mernache, A. Sehisseh, Amina Amrane, S. Hadji, Yasmine Melhani, Mohamed Grine, Lakhdar Messai

引用次数: 0

Fast model for phase transformations during cooling of pre-annealed multiphase steels 预退火多相钢冷却过程中相变的快速模型

Computer Methods in Material Science Pub Date : 1900-01-01 DOI: 10.7494/cmms.2019.4.0645

D. Szeliga, R. Kuziak, W. Zalecki, V. Pidvysotskyy, Yuling Chang, W. Bleck, D. Bachniak, M. Pietrzyk

引用次数: 2

Fundamentals of a recommendation system for the aluminum extrusion process based on data-driven modeling 基于数据驱动建模的铝挤压工艺推荐系统的基础

Computer Methods in Material Science Pub Date : 1900-01-01 DOI: 10.7494/cmms.2022.4.0782

M. Perzyk, Andrzej Kocha�ski, Jacek Koz�owski

引用次数: 0

The influence of material aging on the structural behavior of a flexible roof with a polymer membrane shell 材料老化对聚合物膜壳柔性屋面结构性能的影响

Computer Methods in Material Science Pub Date : 1900-01-01 DOI: 10.7494/cmms.2021.1.0748

A. Chesnokov, V. Mikhailov, I. Dolmatov

{"title":"The influence of material aging on the structural behavior of a flexible roof with a polymer membrane shell","authors":"A. Chesnokov, V. Mikhailov, I. Dolmatov","doi":"10.7494/cmms.2021.1.0748","DOIUrl":"https://doi.org/10.7494/cmms.2021.1.0748","url":null,"abstract":"The roof structure considered in the research consists of continuous cables and a number of spreaders forming a three-dimensional frame. The frame is covered with a polymer membrane made of flexible architectural fabrics. The elements of the roof are compact and suitable for transportation to remote construction sites. The roof also has advantages for developing areas with harsh climatic conditions. The flexible elements of the roof, however, only provide transmission of tensile forces. Under compression, cables slacken and the membrane becomes wrinkled. Pre-tension of the flexible elements, which is introduced to retain the operability of the roof, tends to gradually diminish due to material aging. The aging results in the alteration of strength properties and creep elongation of the structural elements. It induces membrane tearing on local areas. Force alteration in primary structural members is examined in the present study, with statistical methods used for data analysis. They include significance hypothesis testing and correlation coefficients estimation. The data are obtained by the Finite Element simulation of the roof using EASY-2020 software. The results of the work may be used for life expectancy assessment of flexible roof structures, providing important infor - mation for the preliminary design stage. The work contributes to the safety enhancement of cable-membrane structures and the expansion of their scope in permanent building constructions.","PeriodicalId":401877,"journal":{"name":"Computer Methods in Material Science","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122580634","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

Processes simulations with multiscale materials models using a dedicated interface 使用专用接口处理多尺度材料模型的模拟

Computer Methods in Material Science Pub Date : 1900-01-01 DOI: 10.7494/cmms.2021.4.0764

Grzegorz Smyk, D. Szeliga

{"title":"Processes simulations with multiscale materials models using a dedicated interface","authors":"Grzegorz Smyk, D. Szeliga","doi":"10.7494/cmms.2021.4.0764","DOIUrl":"https://doi.org/10.7494/cmms.2021.4.0764","url":null,"abstract":"The main goal of this work is the integration of in-house software with commercial numerical software based on the finite element method (FEM). The main idea is to develop a universal interface to perform process simulations with multiscale models. The interface allows the combination of external procedures with commercial software with minimum programmer’s work putting in integration. As an example, the model of material recrystallization of steel was implemented, added to the commercial application, and the software was tested for a process defined as a sequence of compression and cooling. The material model takes into consideration each type of recrystallization that occurs during a sequence of thermal and mechanical processing such as static re - crystallization (SRX), dynamic recrystallization (DRX), and meta-dynamic recrystallization (MDRX). It allows the prediction of recrystallized volume fraction (X) and grain growth on each step of numerical simulation for each Gauss point in the computation domain. The presented multiscale model of process sequences not only allows to calculate microscale model parameters such as grain growth and recrystallized volume fraction, but also reflects the impact of the microscale model on macroscale parameters.","PeriodicalId":401877,"journal":{"name":"Computer Methods in Material Science","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128653568","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