Pub Date : 2023-01-01DOI: 10.4322/2176-1523.20222690
Gleicon Roberto de Sousa Maior, Juliano Tessinari Zagôto, Marciel Zucoloto Pizetta, Arthur Pereira Pires
{"title":"Otimização do polimento de chapas de rochas ornamentais com uso de programação linear","authors":"Gleicon Roberto de Sousa Maior, Juliano Tessinari Zagôto, Marciel Zucoloto Pizetta, Arthur Pereira Pires","doi":"10.4322/2176-1523.20222690","DOIUrl":"https://doi.org/10.4322/2176-1523.20222690","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527002","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 : 2023-01-01DOI: 10.4322/2176-1523.20222757
R. F. Ferreira, Régis Bueno da Silva
{"title":"Influência do processo de lixiviação parcial do quartzo na liberação mineral de itabiritos do Quadrilátero Ferrífero","authors":"R. F. Ferreira, Régis Bueno da Silva","doi":"10.4322/2176-1523.20222757","DOIUrl":"https://doi.org/10.4322/2176-1523.20222757","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527289","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 : 2023-01-01DOI: 10.4322/2176-1523.20222792
R. Silva, D. Couto, A. Tavares, Morgana Menezes Ribeiro, Luzia Chaves, L. Guimarães, Kely Fonseca, André Carlos Silva
{"title":"Static tests to assess acid mine drainage potential of copper sulfide flotation tailings","authors":"R. Silva, D. Couto, A. Tavares, Morgana Menezes Ribeiro, Luzia Chaves, L. Guimarães, Kely Fonseca, André Carlos Silva","doi":"10.4322/2176-1523.20222792","DOIUrl":"https://doi.org/10.4322/2176-1523.20222792","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527157","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 : 2023-01-01DOI: 10.4322/2176-1523.20222767
L. Godefroid, A. Bernardes, T. Muniz, J. J. Vilela, F. A. Machado
This research consisted in comparing the fatigue crack growth (FCG) performance of four HSLA/ AHSS steels used in automotive applications and with different microstructures, and the application of some prediction models for the da/dN versus ΔK traditional sigmoidal curve as a function of the R load ratio. FCG tests were carried out on C(T) test specimens with R-ratios varying between 0.03 and 0.7. Using the original and empirical methodology proposed by Paris and Erdogan to describe the da/dN-ΔK relationship, the results showed significant differences in function of microstructure, and a deleterious effect of R-ratio increase on the crack growth rate. In order to check existing methodologies based on physical considerations for predicting the fatigue behavior of materials and the effect of the R-ratio mainly in the fatigue threshold ΔK th region, the well-known crack closure model proposed by Elber, an approach using two parameters as a driving force for the crack growth proposed by Vasudevan and co-authors and a combination of these two models recently proposed by Zhu and co-authors were compared. The manifestation of crack closure and its qualitatively expected dependence on the R-ratio were verified for the studied steels, but the Elber model was not able to provide a master curve that accurately summarized the effect of the R-ratio on the sigmoidal fatigue curve of steels. The combined use of two critical thresholds, ΔK th * and K max *, for predicting fatigue crack growth according to the Vasudevan model also did not provide accurate results in evaluating the effect of the R-ratio. Regardless of the verified dispersions, there is a connection between the two-parameter methodology and crack closure, hence the model by Zhu and co-authors could be a promising alternative. However, this model also showed significant dispersions and was unable to create a master curve to adequately predict the effect of R-ratio on crack growth. Thus, it can be concluded that this research topic is still open, requiring a more in-depth phenomenological knowledge to predict the effect of the R-ratio on FCG.
本研究比较了四种不同显微组织的汽车用HSLA/ AHSS钢的疲劳裂纹扩展(FCG)性能，并应用了da/dN与ΔK传统s型曲线作为R载荷比函数的预测模型。对C(T)试样进行FCG试验，r -比值在0.03 ~ 0.7之间。采用Paris和Erdogan提出的原始和经验方法来描述da/dN-ΔK关系，结果表明微观结构的功能存在显著差异，r比的增加对裂纹扩展速率有不利影响。为了检验现有的基于物理因素预测材料疲劳行为的方法以及主要在疲劳阈值ΔK th区域的r比的影响，比较了Elber提出的著名的裂纹闭合模型、Vasudevan等人提出的使用两个参数作为裂纹扩展驱动力的方法以及Zhu等人最近提出的这两种模型的组合。对于所研究的钢，裂纹闭合的表现及其对r比的定性预期依赖得到了验证，但Elber模型无法提供一个准确概括r比对钢的s型疲劳曲线影响的主曲线。根据Vasudevan模型，联合使用ΔK th *和K max *两个临界阈值来预测疲劳裂纹扩展，在评估r比的影响时也没有提供准确的结果。无论验证的分散度如何，双参数方法与裂纹闭合之间存在联系，因此Zhu及其合著者的模型可能是一个有希望的替代方案。然而，该模型也表现出明显的分散性，无法建立一个主曲线来充分预测r比对裂纹扩展的影响。因此，可以得出结论，该研究课题仍然是开放的，需要更深入的现象学知识来预测R-ratio对FCG的影响。
{"title":"Effect of R load ratio on fatigue crack growth resistance of steels used in automotive applications: experimental results and use of performance prediction models","authors":"L. Godefroid, A. Bernardes, T. Muniz, J. J. Vilela, F. A. Machado","doi":"10.4322/2176-1523.20222767","DOIUrl":"https://doi.org/10.4322/2176-1523.20222767","url":null,"abstract":"This research consisted in comparing the fatigue crack growth (FCG) performance of four HSLA/ AHSS steels used in automotive applications and with different microstructures, and the application of some prediction models for the da/dN versus ΔK traditional sigmoidal curve as a function of the R load ratio. FCG tests were carried out on C(T) test specimens with R-ratios varying between 0.03 and 0.7. Using the original and empirical methodology proposed by Paris and Erdogan to describe the da/dN-ΔK relationship, the results showed significant differences in function of microstructure, and a deleterious effect of R-ratio increase on the crack growth rate. In order to check existing methodologies based on physical considerations for predicting the fatigue behavior of materials and the effect of the R-ratio mainly in the fatigue threshold ΔK th region, the well-known crack closure model proposed by Elber, an approach using two parameters as a driving force for the crack growth proposed by Vasudevan and co-authors and a combination of these two models recently proposed by Zhu and co-authors were compared. The manifestation of crack closure and its qualitatively expected dependence on the R-ratio were verified for the studied steels, but the Elber model was not able to provide a master curve that accurately summarized the effect of the R-ratio on the sigmoidal fatigue curve of steels. The combined use of two critical thresholds, ΔK th * and K max *, for predicting fatigue crack growth according to the Vasudevan model also did not provide accurate results in evaluating the effect of the R-ratio. Regardless of the verified dispersions, there is a connection between the two-parameter methodology and crack closure, hence the model by Zhu and co-authors could be a promising alternative. However, this model also showed significant dispersions and was unable to create a master curve to adequately predict the effect of R-ratio on crack growth. Thus, it can be concluded that this research topic is still open, requiring a more in-depth phenomenological knowledge to predict the effect of the R-ratio on FCG.","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527454","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 : 2023-01-01DOI: 10.4322/2176-1523.20222096
Marcelo de Matos Macedo, João Ademar de Andrade Lima, C. Alcântara, Wilian da Silva Labiapari, R. Cozza
{"title":"Projeto, construção e validação de um tribômetro\u0000 ball-cratering de configuração mecânica esfera-fixa","authors":"Marcelo de Matos Macedo, João Ademar de Andrade Lima, C. Alcântara, Wilian da Silva Labiapari, R. Cozza","doi":"10.4322/2176-1523.20222096","DOIUrl":"https://doi.org/10.4322/2176-1523.20222096","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70525852","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 : 2023-01-01DOI: 10.4322/2176-1523.20222347
E. M. Oliveira, Maria Beatriz Santos Felipe, Jonni Guiller Ferreira Madeira, M. Springer, L. Silva, J. A. Castro
{"title":"Study of the polystyrene degradation in water using nanoparticle tracking analysis (NTA)","authors":"E. M. Oliveira, Maria Beatriz Santos Felipe, Jonni Guiller Ferreira Madeira, M. Springer, L. Silva, J. A. Castro","doi":"10.4322/2176-1523.20222347","DOIUrl":"https://doi.org/10.4322/2176-1523.20222347","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526416","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 : 2023-01-01DOI: 10.4322/2176-1523.20222744
João Wagner Silva Alves, Natal Junio Pires, M. Oliveira
{"title":"Estudo para remoção dos íons Ca2+ e Mg2+ da água por Magnafloc 338 e Alginato de sódio em um sistema de flotação por ar dissolvido","authors":"João Wagner Silva Alves, Natal Junio Pires, M. Oliveira","doi":"10.4322/2176-1523.20222744","DOIUrl":"https://doi.org/10.4322/2176-1523.20222744","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526884","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 : 2023-01-01DOI: 10.4322/2176-1523.20222761
W. B. A. Bezerra, U. O. Costa, João Gabriel Passos Rodrigues, Benjamin S. Lazarus, S. Tavares, F. S. Luz, S. Monteiro
{"title":"Influence of Arapaima gigas fish scales as reinforcement in DGEBA/TETA epoxy composite for flooring applications: mechanical and thermal behavior","authors":"W. B. A. Bezerra, U. O. Costa, João Gabriel Passos Rodrigues, Benjamin S. Lazarus, S. Tavares, F. S. Luz, S. Monteiro","doi":"10.4322/2176-1523.20222761","DOIUrl":"https://doi.org/10.4322/2176-1523.20222761","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527396","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 : 2023-01-01DOI: 10.4322/2176-1523.20232749
Ana Carolina de Souza, Luiz Rogério Pinho de Andrade Lima
{"title":"Separação de tório de elementos terras raras leves em soluções clorídricas por extração por solvente","authors":"Ana Carolina de Souza, Luiz Rogério Pinho de Andrade Lima","doi":"10.4322/2176-1523.20232749","DOIUrl":"https://doi.org/10.4322/2176-1523.20232749","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70527463","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 : 2023-01-01DOI: 10.4322/2176-1523.20222533
G. Barbieri, Aloysio Arthur Becker Fogliatto, Mário Wolfart
{"title":"Influência das temperaturas de pré e pós-aquecimento sobre a formação de trincas induzidas por hidrogênio na soldagem de reparo de aços AISI D6","authors":"G. Barbieri, Aloysio Arthur Becker Fogliatto, Mário Wolfart","doi":"10.4322/2176-1523.20222533","DOIUrl":"https://doi.org/10.4322/2176-1523.20222533","url":null,"abstract":"","PeriodicalId":53327,"journal":{"name":"Tecnologia em Metalurgia Materiais e Mineracao","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70526280","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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