Strengthening of cruciform sample arms for large strains during biaxial stretching

Mitukiewicz, G.; Głogowski, Marek J.; Stelmach, J.; Leyko, J.; Dimitrova, Z. M.; Batory, D.

doi:10.1016/j.mtcomm.2019.100692

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Above the test stand, there is a camera placed perpendicularly on the tripod in order to take pictures after each small stretching motion. A measuring system has been described in previous work -Mitukiewicz et al [25]. The ratio between millimetres and pixels was 1 mm/20 px.…”

Section: Test Standmentioning

confidence: 99%

Analysis of the Cruciform Sample Shapes for Bi-Axial Tensile Tests Based on the Geometries Currently Presented in the Literature

Mitukiewicz¹,

Kuzalski²,

Goszczak³

et al. 2021

Adv. Sci. Technol. Res. J.

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The paper contributes to the global research of the best shape of cruciform samples for biaxial tensile tests. Based on literature research, one of the proposed samples' shape comparison methodology was employed to achieve the ultimate results. A variety of specimens with different shapes were compared and modelled with the use of Finite Element Method (FEM). Afterwards, five the most promising sample shapes were examined on a tests stand to validate the simulation results. Based on the obtained research results a new parameter defining the ability of the cruciform sample to reach the possible achievable strain in the centre area, was introduced. The obtained data shows, that sample with the highest Relative Cost Function parameter (RCF) presented the highest strain in the gauge region and the sample with the lowest RCF reached the lowest strain in the center. The rest of the samples remained within the general trend showing a compatibility between the RCF parameter and the obtained strain.

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Section: Test Standmentioning

confidence: 99%

Analysis of the Cruciform Sample Shapes for Bi-Axial Tensile Tests Based on the Geometries Currently Presented in the Literature

Mitukiewicz¹,

Kuzalski²,

Goszczak³

et al. 2021

Adv. Sci. Technol. Res. J.

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“…The sample shape developed by the Kuwabara et al [10,11] was adopted as the international standard for the cruciform sample in 2014. Determination of FLD using cruciform samples is very promising due to their frictionless character, access to a pure two-dimensional stress area and in-situ measurement of strain on both side of the gauge region [12]. Nikhare [13] suggested that conventional forming limit test limits the possibilities of applying multiaxial loading.…”

Section: Introductionmentioning

confidence: 99%

Biaxial Tensile Testing of Cruciform Samples to Determine the Impact of Pre-Strain on the Forming Limit Diagram of Aluminum Alloy 5052 through Finite Element Simulation

Pawar,

Kumar,

Narasimhan

2024

IOP Conf. Ser.: Mater. Sci. Eng.

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The present work focuses on the effect of pre-strain on the forming limit curves (FLCs) of aluminium alloy 5052 sheet of 2.5 mm thickness using cruciform samples. To identify the effect of pre-strain on the FLC, the finite element simulations are performed on cruciform samples. The cruciform samples are deformed to a small level of pre-strain in different strain paths. Thereafter, the further deformation under the various strain paths to measure the effect of pre-strain on the forming limits are carried out. Pre-strain in uniaxial, plane strain and biaxial loading conditions are considered in this work. For each case, i.e., uniaxial, plane strain and biaxial conditions two pre-strain conditions are considered. The cruciform samples are carefully thinned in the central region to promote development of large plastic strains there and eventually to neck and fail. The output obtained through simulations are presented in terms of forming limit curves for various strain paths.

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“…Recent testing systems allow the implementation of a complex stress-strain state by loading cruciform specimens in two orthogonal axes [30][31][32], the tension of tubular specimens under the internal pressure [33,34], the torsion of tubular specimens with bending [35][36][37][38], and tension-compression with torsion [39][40][41]. Experimental studies of the degradation of the composites' mechanical properties under multiaxial cyclic loading have been presented previously [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Degradation of Fiberglass Tubes during Biaxial Proportional Cyclic Loading

et al. 2023

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Composite structures during an operation are subjected to various types of external loading (impact, vibration, cyclic, etc.), which may lead to a decrease in mechanical properties. Previously, many experimental investigations of the mechanical behavior of composites under uniaxial cyclic loading were carried out. Acquisition of new data on the reduction of composite materials’ mechanical characteristics under conditions of multiaxial cyclic loading, as well as verification of existing models for calculation of the residual properties, are relevant. Therefore, this work is devoted to the experimental investigation of the mechanical behavior of fiberglass tubes under proportional cyclic loading. Static and fatigue tests were carried out under tension with torsion conditions. Inhomogeneous strain fields were obtained using a non-contact optical video system VIC-3D. The structural damage accumulation processes were analyzed by an AMSY-6 acoustic emission signals recording system. Surface defects were determined using a DinoLite microscope. Residual dynamic elastic modules were calculated during fatigue tests, and fatigue sensitivity curves were built. Data was approximated using various models, and their high descriptive capability was revealed. Damage accumulation stages were determined. The dependence of the models’ parameters on a stress state were observed. It was concluded that multiaxial cyclic loading leads to a significant decrease in mechanical properties, which should be taken into account in composite structure design.

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Strengthening of cruciform sample arms for large strains during biaxial stretching

Cited by 4 publications

References 17 publications

Analysis of the Cruciform Sample Shapes for Bi-Axial Tensile Tests Based on the Geometries Currently Presented in the Literature

Analysis of the Cruciform Sample Shapes for Bi-Axial Tensile Tests Based on the Geometries Currently Presented in the Literature

Biaxial Tensile Testing of Cruciform Samples to Determine the Impact of Pre-Strain on the Forming Limit Diagram of Aluminum Alloy 5052 through Finite Element Simulation

Mechanical Properties Degradation of Fiberglass Tubes during Biaxial Proportional Cyclic Loading

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