Extended evaluation of Erichsen cupping test results by means of laser speckle

Kocańda, A.; Jasiński, C.

doi:10.1016/j.acme.2015.10.007

Cited by 21 publications

(17 citation statements)

References 2 publications

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“…W ostatnim czasie pojawiło się wiele prac dotyczących badań materiałowych, opartych m.in. na próbie Erichsena [7][8][9][10][11]. Kocańda i Jasiński [7] zaproponowali wprowadzenie dodatkowego parametru w próbie Erichsena, tj.…”

Section: Wprowadzenieunclassified

“…na próbie Erichsena [7][8][9][10][11]. Kocańda i Jasiński [7] zaproponowali wprowadzenie dodatkowego parametru w próbie Erichsena, tj. wysokości czaszy (oznaczanej jako LN-IE) w momencie zlokalizowania pocienienia blachy poprzedzającego pęknięcie materiału.…”

Section: Wprowadzenieunclassified

“…W tym celu opracowali własną metodę wykorzystującą zjawisko widma laserowego pojawiającego się na chropowatej powierzchni oświetlonej plamką lasera. W badaniach doświadczalnych dla blach ze stopu aluminium 5754H22 oraz stalowych DC04 i Dogal800DP wykazali niewielkie różnice (0-8%) między ich wskaźnikiem LN-IE a standardowym wskaźnikiem Erichsena IE [7]. Sigh i inni [8] przeprowadzili analizę tłoczności blach o różnej grubości ze stopu aluminium AA 1200.…”

Section: Wprowadzenieunclassified

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Ocena tłoczności blach metodami Engelhardta i Erichsena

Miłek

2018

ZN PRz Mechanika

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Section: Wprowadzenieunclassified

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Ocena tłoczności blach metodami Engelhardta i Erichsena

Miłek

2018

ZN PRz Mechanika

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“…Optical techniques such as digital image correlation (DIC) and laser speckle interferometry have been used to monitor the dome heights at which failure occurs for different sheet thicknesses (steel and aluminium) and to evaluate the necking behaviour [16][17][18]. Models have examined strains at certain IEs to determine a failure criterion for sheet metal neglecting the presence of a coating [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Quantification of coating surface strains in Erichsen cupping tests

et al. 2019

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Thermosetting polyester-based coatings are used to produce pre-painted metal in the coil coating industry. The coated steel sheet is formed into white goods and architectural cladding, which involves large deformations of the metal and results in large strains in the coating. The Erichsen cupping test is a standard method used to assess the formability, ductility and adhesion of coatings, which induces similar strains to those experienced during forming. It is a qualitative and robust quality control method, but the behaviour of coatings during the test has never been previously studied quantitatively. Failure of coatings on sheet metal during forming is a strain-governed process, so understanding the behaviour of a coating in the Erichsen cupping test will allow the formability, material properties and chemical structure of the polymer to be linked more closely, enabling the development of better coatings. A finite element model has been developed to calculate the coating surface strains for any level of indentation during the test and has been validated using the surface strains during cupping measured by digital image correlation. A master curve of the maximum strain versus the indentation depth (Erichsen index) has been determined. This allows the strain to failure of the coating on a substrate, a critical material property which is otherwise difficult and laborious to obtain, to be simply determined from the Erichsen test for the first time. The relationship between the Erichsen index and maximum surface strain presented here enables users to obtain this material property both from future tests and from the results of historic tests (as many coating suppliers and users have extensive databases of Erichsen test results stretching back many years). This novel framework provides a quantitative method to analyse the performance of coatings used in the coil industry, redeveloping a century-old technique.

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“…where D h is the average hole diameter after rupture and D o is the original hole diameter. Another test also extensively adopted to assess the formability of metallic sheets is the Erichsen cupping test [5][6][7][8]. The Erichsen Cupping Test (ECT) is aimed to produce stretching conditions on thin sheets by imposing a spherical or hemispherical punch against a clamped specimen placed between a die and a blank-holder.…”

Section: Introductionmentioning

confidence: 99%

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

et al. 2019

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The material characterization regarding sheet metal formability is usually assessed by the forming limit curve (FLC). The FLC requires specialized and expensive equipment, several samples with different geometries, and can be a very time-consuming procedure for data treatment. Alternatively, the hole expansion test (HET) and the Erichsen Cupping Test (ECT) can be used for routine evaluations of sheet metal mechanical behavior. These formability tests require fewer quantities of material and easy specimen preparation with a fast analysis of results. The HET and ECT procedures provide a proper evaluation of sheet material stretch-flangeability, formability, strength, and ductility. In this work, we developed a low-cost mechanical device capable of performing the HET and ECT tests using a universal testing machine. The equipment is designed to meet the test parameters set by ISO 16630 (HET) and ISO 20482 (ECT) standards. In order to verify its functionality, tests were carried out with the dual-phase steels DP600 and DP780. The corresponding values determined for the hole expansion ratio and the Erichsen index provided reliable results in terms of the accuracy and repeatability of the proposed testing device.

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Extended evaluation of Erichsen cupping test results by means of laser speckle

Cited by 21 publications

References 2 publications

Ocena tłoczności blach metodami Engelhardta i Erichsena

Ocena tłoczności blach metodami Engelhardta i Erichsena

Quantification of coating surface strains in Erichsen cupping tests

Development of a Device Compatible with Universal Testing Machine to Perform Hole Expansion and Erichsen Cupping Tests

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