Specimen for a novel concept of the biaxial tension test

Geiger, Manfred; Hußnätter, W.; Merklein, Marion

doi:10.1016/j.jmatprotec.2005.05.028

Cited by 40 publications

(20 citation statements)

References 5 publications

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“…FIGURE 2 shows examples of cruciform specimens from previous studies [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The cruciform specimens shown in FIGURE 2(a) and (b) have a gauge section thinner than the periphery; it is not easy to create this geometry using sheet materials approximately a few mm thick, which are commonly used in sheet stamping operations in industry.…”

Section: Biaxial Tension Test Using a Cruciform Specimenmentioning

confidence: 99%

Advanced material testing in support of accurate sheet metal forming simulations

Kuwabara¹

2013

AIP Conference Proceedings

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An advanced constitutive model in the sheet metal forming simulation: the Teodosiu microstructural model and the Cazacu Barlat yield criterion AIP Conf.Abstract. This presentation is a review of experimental methods for accurately measuring and modeling the anisotropic plastic deformation behavior of metal sheets under a variety of loading paths: biaxial compression test, hydraulic bulge test, biaxial tension test using a cruciform specimen, multiaxial tube expansion test using a closed-loop electrohydraulic testing machine for the measurement of forming limit strains and stresses, combined tension-shear test, and in-plane stress reversal test. Observed material responses are compared with predictions using phenomenological plasticity models to highlight the importance of accurate material testing. Special attention is paid to the plastic deformation behavior of sheet metals commonly used in industry, and to verifying the validity of constitutive models based on anisotropic yield functions at a large plastic strain range. The effects of using appropriate material models on the improvement of predictive accuracy for forming defects, such as springback and fracture, are also presented.The hydraulic bulge test is widely used in determining the work hardening characteristics of sheet materials up to plastic strains greater than can be achieved in simple tension [3]. For an accurate determination of the stress-strain curves, the strain rate must be constant during bulging [4]. Yoshida [5] performed FE analyses for a hydraulic bulge test and clarified that the stress measurement error is less than 1 % when the experimental conditions satisfy thatradius of die cavity, D U : initial gauge length for the measurement of the radius of curvature at the apex of the bulged specimen, D H : initial gauge length for the measurement of the meridian strain at the apex of the bulged specimen, 0 t : initial thickness of test material). Biaxial Compression TestThe biaxial compression test is also valuable for sheet materials [6][7][8]. FIGURE 1(a) is a schematic diagram of biaxial compression tests using adhesively bonded sheet laminate specimens, showing how different stress states can be obtained in the S -plane [7]. The validity of the testing method can be verified using a method as shown FIGURE 1(b); the stress-strain curve measured for the biaxial compression along the RD and TD (equivalent to the uniaxial tension in the thickness direction) are in agreement with that for the uniaxial compression in the thickness direction.

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Section: Biaxial Tension Test Using a Cruciform Specimenmentioning

confidence: 99%

Advanced material testing in support of accurate sheet metal forming simulations

Kuwabara¹

2013

AIP Conference Proceedings

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“…More recently, viscous silicon domes have been used by Gutscher et al (2004) which are able to deform with the surface of the sheet, offering some of the benefits of the hydraulic test but with simpler apparatus. Geiger et al (2005a) have suggested returning to the use of cruciform specimens clamped at the ends of their arms and pressed from beneath by an arrangement of four rollers. In further work Geiger et al (2005b) show that the same test may be used to map a wider arc of strain space, by varying the length ratio of the cross arms of the sample.…”

Section: Testing the Formability Of Sheet Materialsmentioning

confidence: 99%

Design and use of a novel sample design for formability testing in pure shear

Shouler

Allwood

2010

Journal of Materials Processing Technology

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“…In comparison with parameters that are determined in uniaxial experiments, e.g. uniaxial tensile tests, the yield locus defines a starting point of plastification as a function of the biaxial stress condition (Geiger et al, 2005). The typical force system that acts on the specimen during the test is presented in Fig.…”

Section: Specimen Designmentioning

confidence: 99%

“…17 when an arbitrary load of 1000 N was applied to the specimen in one direction. Geiger et al (2005) optimized biaxial test specimen design using FEA. The novel specimen used is shown in Fig.…”

Section: Specimen Designmentioning

confidence: 99%