Application of Thermography to Analyse the Influence of the Deformation Speed in the Forming Process

Blanco, Manuel San Juan; Martín, Óscar; Martín, Francisco Javier Santos; Tiedra, Pilar De; Daroca, F.; López, Ronald Campos

doi:10.1016/j.proeng.2013.08.233

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…One of the most relevant works was presented by Taylor and Quinney [1], who studied the relation between thermal and mechanical material properties, quantifying the fraction of plastic work converted to heat. This is defined by the very well-known Taylor-Quinney coefficient, which is dependent on the material properties and the deformation process conditions, mainly the strain rate [2,3]. The experimental detection of localized necking in sheet metal forming using strain-based methods is the most common and extended technique nowadays [4].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study on the Onset of Necking Detection Using DIT in Tensile Tests

Palomo

Martínez-Donaire

Fernández

et al. 2022

KEM

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The experimental detection of localized necking is an important issue in sheet metal forming. Today, the most common and extended techniques are strain-based methods using digital image correlation (DIC). The present work discuses a thermal methodology to detect the onset of necking in metals based on the analysis of the temperature gradient using digital infrared thermography (DIT). A series of tensile tests of H240LA-O3 high-strength steel of 1.2mm thickness is analysed using DIC and DIT techniques. It is proposed that necking initiates when the temperature difference at a reference distance from the necking point reaches a critical value, which allows identifying the necking time and estimating the limit strains from the visible images using circle grid analysis.

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Section: Introductionmentioning

confidence: 99%

Preliminary Study on the Onset of Necking Detection Using DIT in Tensile Tests

Palomo

Martínez-Donaire

Fernández

et al. 2022

KEM

View full text Add to dashboard Cite

show abstract

“…Due to the supply of thermal energy, it is easy to notice temperature differences in the material and possible anomalies [ 9 ]. Passive thermovision is based on the measurement of the temperature field of an object that was created as a result of its operation [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Coupled Thermomechanical Response Measurement of Deformation of Nickel-Based Superalloys Using Full-Field Digital Image Correlation and Infrared Thermography

et al. 2021

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The paper is devoted to highlighting the potential application of the quantitative imaging technique through results associated with work hardening, strain rate and heat generated during elastic and plastic deformation. The aim of the research presented in this article is to determine the relationship between deformation in the uniaxial tensile test of samples made of 1-mm-thick nickel-based superalloys and their change in temperature during deformation. The relationship between yield stress and the Taylor–Quinney coefficient and their change with the strain rate were determined. The research material was 1-mm-thick sheets of three grades of Inconel alloys: 625 HX and 718. The Aramis (GOM GmbH, a company of the ZEISS Group) measurement system and high-sensitivity infrared thermal imaging camera were used for the tests. The uniaxial tensile tests were carried out at three different strain rates. A clear tendency to increase the sample temperature with an increase in the strain rate was observed. This conclusion applies to all materials and directions of sample cutting investigated with respect to the sheet-rolling direction. An almost linear correlation was found between the percent strain and the value of the maximum surface temperature of the specimens. The method used is helpful in assessing the extent of homogeneity of the strain and the material effort during its deformation based on the measurement of the surface temperature.

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“…Os valores obtidos foram comparados com os valores previstos para condição teórica de aquecimento adiabático, a qual superestimou os valores medidos experimentalmente. Recentemente, os estudos termomecânicos que envolvem o uso da termografia por infravermelho restringem-se mais aos ensaios de tração, nos quais procura-se avaliar o aumento da temperatura durante as deformações elástica e plástica, na estricção e na fratura de diferentes materiais [12][13][14]. Além disso, esses estudos auxiliam no desenvolvimento de modelos matemáticos capazes de predizer a temperatura em função do material, tensão, deformação e taxa de deformação até a tensão de resistência máxima do material e transformações de fase induzidas pela deformação plástica [15].…”

Section: Introductionunclassified

Estudo do comportamento termomecânico do aço inoxidável AISI 430 por meio da termografia por infravermelho

et al. 2021

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RESUMO Este trabalho tem como objetivo investigar o aumento da temperatura em chapas de aço inoxidável AISI 430 durante o ensaio de tração para as seguintes taxas de deformação: 0,001; 0,01 e 0,1 s-1. Para registrar a evolução da temperatura até a fratura dos corpos de prova, foi utilizada uma termocâmera por infravermelho. Os resultados obtidos pela técnica da termografia por infravermelho mostraram um aumento gradual e uniforme da temperatura durante o encruamento do material e uma elevação drástica da temperatura nas regiões de estricção e fratura dos corpos de prova. Para a taxa de deformação de 0,1 s-1 foi observado o maior gradiente de temperatura entre a estricção localizada e a fratura (110 ºC).

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Application of Thermography to Analyse the Influence of the Deformation Speed in the Forming Process

Cited by 6 publications

References 7 publications

Preliminary Study on the Onset of Necking Detection Using DIT in Tensile Tests

Preliminary Study on the Onset of Necking Detection Using DIT in Tensile Tests

Coupled Thermomechanical Response Measurement of Deformation of Nickel-Based Superalloys Using Full-Field Digital Image Correlation and Infrared Thermography

Estudo do comportamento termomecânico do aço inoxidável AISI 430 por meio da termografia por infravermelho

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