Development of a mini-tensile approach for sheet metal testing using Digital Image Correlation

Cruz, Daniel J.; Shamchi, Sahand Pourhassan; Santos, Abel D.; Amaral, Rui; Tavares, Paulo J.; Moreira, P.M.G.P.

doi:10.1016/j.prostr.2020.04.036

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…Globally, the results of the miniaturized specimen are in very good agreement with the macro tensile test. In fact, for both materials, the elastic part and the hardening behaviour is very similar for both specimens geometries, which is in agreement with previous findings [22]. Figure 5 shows the comparison between tension and compression using the miniaturized specimens, for: (a) DP600 and (b) AA5754.…”

Section: Resultssupporting

confidence: 89%

“…The experimental tension-compression tests were performed using an equipment specifically designed for miniaturized specimens -Mini Sample Tester Device (MSTD), see Figure 2 (a) [22,23]. The geometry of the miniaturized specimen was optimized to reduce the buckling effect in the thickness direction, see Figure 2 (b).…”

Section: Methodsmentioning

confidence: 99%

“…Hußnätter [21] used a specimen geometry with a 2 mm length by 2 mm width for the characterization of the magnesium alloy AZ31, achieving about 5% of compressive strains before the specimen buckles. Cruz et al [22] have analysed the mechanical behaviour of sheet materials, comparing miniaturized test samples with macro standard tensile specimens, concluding that miniaturized test samples can accurately describe the mechanical material behaviour and thus, they can be used to evaluate the mechanical behaviour of sheet metal materials during reverse loadings.…”

Section: Introductionmentioning

confidence: 99%

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Work Hardening of Metallic Sheets under Tension-Compression and Simple Shear Reverse Loading

Cruz¹,

Pereira

Simões

et al. 2022

KEM

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The hardening models have a significant influence on the accuracy of finite element analysis (FEA). Although, isotropic hardening models are the most widely used, it is known that kinematic hardening models (describing the Bauschinger effect and permanent softening) can significantly improve the accuracy of FEA results. However, when considering sheet metal materials, the parameters of kinematic hardening models are difficult to identify due to the challenges of obtaining experimental results from test with strain path inversions. This work considers an experimental procedure that enables the analysis of the mechanical behaviour of sheet metal materials submitted to reverse loadings. A miniaturized test device was developed to perform tension and compression tests, with reverse loadings, for sheet metal materials. This specimen design has two main advantages: (1) reduces buckling during compression (compared to standard tensile test specimens) and, consequently, (2) enables the characterization of the mechanical behaviour under reverse tension-compression strain paths changes. The small size of the specimens, with 2 x 2 mm gauge area, poses the main challenge of the current methodology, namely the measurement of the strain field distribution using the Digital Image Correlation (DIC) technique. The results obtained from tension-compression tests with mini-specimens are validated by comparison with standard tensile and shear (reverse loading) and tests.

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Section: Resultssupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Work Hardening of Metallic Sheets under Tension-Compression and Simple Shear Reverse Loading

Cruz¹,

Pereira

Simões

et al. 2022

KEM

Self Cite

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show abstract

“…Based on these considerations, a new type of equipment was developed, specifically designed to test miniaturized specimens on a reduced scale, and we refer to it as a Miniaturized Specimen Tester Device (MSTD) [28]. As represented in Figure 2, MSTD consists of three groups of components with their well-defined function.…”

Section: Design Of An Uniaxial Test Equipment For Miniaturized Specimensmentioning

confidence: 99%

“…Cruz et al [28] developed an experimental equipment to perform uniaxial mechanical tests on miniaturized metallic specimens. The current work is a step forward in these developments, exploring the applicability of this equipment to describe the mechanical behavior of sheet metal materials, not only for monotonic uniaxial tests, i.e., tension and compression, but also for reverse loading tests, i.e., tension followed by compression or vice versa.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Device Coupled with Digital Image Correlation for Mechanical Testing

et al. 2022

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Miniaturized mechanical testing based on small sample testing technology is a powerful technique to characterize the mechanical properties of different materials, and it is being used in different application fields. However, the small size of the specimens poses several challenges because the results are highly sensitive to measurement accuracy and the corresponding mechanical properties can change substantially due to the so-called specimen size effect. In this work, a novel testing device based on miniaturized specimens is presented. The equipment is designed to test materials in tensile and compressive loadings, but it is also capable of performing reverse-loading tests. Buckling of the specimen is an inherent phenomenon in compression loadings, especially for thin materials. Therefore, specimen geometry is properly studied and optimized to mitigate this effect. To evaluate the deformation of the specimen, the digital image correlation (DIC) technique is used to capture the full-field strain in the central gauge section of the sample. A sensitivity analysis of the DIC setting parameters was performed for this application. To evaluate the performance of the developed system, experimental results of monotonic tests and tests with reverse loadings (tension-compression) are presented, considering two high-strength steels (DP500 and DP780).

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Phase-field approach in elastoplastic solids: application of an iterative staggered scheme and its experimental validation

Azinpour

Cruz

et al. 2021

Comput Mech

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Development of a mini-tensile approach for sheet metal testing using Digital Image Correlation

Cited by 12 publications

References 4 publications

Work Hardening of Metallic Sheets under Tension-Compression and Simple Shear Reverse Loading

Work Hardening of Metallic Sheets under Tension-Compression and Simple Shear Reverse Loading

A Miniaturized Device Coupled with Digital Image Correlation for Mechanical Testing

Phase-field approach in elastoplastic solids: application of an iterative staggered scheme and its experimental validation

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