Characterization of plastic behaviour of sheet metals by hydraulic bulge test

Lăzărescu, Lucian; Comşa, Dan Sorin; Nicodim, Ioan; Ciobanu, Ioan; Banabic, Dorel

doi:10.1016/s1003-6326(12)61719-1

Cited by 39 publications

(23 citation statements)

References 13 publications

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“…2. Figure 4 shows a clamped circular plate with uniform loading pressure p, equation (3) is widely used for calculation of biaxial stress σ b at the point of maximum displacement 'O', which is named the pole [7,8,16,18,[22][23][24]. Equation (3) is known as the equation of Laplace for clamped circular plates.…”

Section: Biaxial Stress-strain Curve and Young's Modulusmentioning

confidence: 99%

“…The bulge test has been successfully applied [6,9,12,[15][16][17][18][19][20][21][22][23][24][26][27][28][29] and differences have been observed in comparison with uniaxial tests. This test is suitable for investigating polymer blends for large biaxial plastic deformation prior to failure [16].…”

Section: Introductionmentioning

confidence: 99%

“…Some applied measuring methods for out-of plane displacement in the bulge test are photogrammetry [9,17,18], digital image correlation [10,16,14,21], interferometry [12], laser triangulation [19], fringe projection [11,20], and stereo vision [24]. The most accurate measuring method is interferometry since the resolution is, at least, half of the laser wavelength.…”

Section: Introductionmentioning

confidence: 99%

“…As an alternative, the bulge test is used for determining the mechanical properties under biaxial tension conditions with small bending component [5]. Among the different test methods for Young's modulus determination, the bulge test has become popular for sheet metal [6][7][8][9], thin films [10][11][12][13], polymers [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], and biological materials [29]. In comparison to uniaxial tests, higher strain values can be achieved by bulge tests [7,16] and the maximum strain obtained in uniaxial tensile test before necking is relatively small [6].…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the Elastic Properties of Polymer Plates Using a Structured Light Technique

et al. 2015

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An experimental device for determining Young's modulus of polymer plates is presented. Two sets of polymer blends were investigated. First samples were made of ethylene propylene diene (EPDM), high density polyethylene (HDPE), and meleic anhydride grafting on polyethylene (PE-MA) reinforced with glass fiber. The second set of samples was made of low density polyethylene (LDPE) reinforced with nylon fiber. Young's modulus of a circular polymeric plate under biaxial stress was determined by measuring its out-of-plane displacement. This test is also known as bulge test. Values of Young's modulus of the polymer plates were compared to those obtained from standard uniaxial tensile tests. Biaxial stress causes tension in all internal reinforcing fibers of the samples, in contrast tensile tests that cause tension mainly in fibers aligned with the applied force. Out-of-plane displacement was measured applying a laser triangulation setup based on a projected laser line and a CCD camera. A mathematical model for plates under the bulge test was then used in Young's modulus calculations using out-of-plane displacement and plate dimensions. It is proved that the bulge test is more sensitive to reinforcement fiber compared to the standard uniaxial tensile test.

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Section: Biaxial Stress-strain Curve and Young's Modulusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimation of the Elastic Properties of Polymer Plates Using a Structured Light Technique

et al. 2015

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“…Lazarescu calculated the stress components from elliptical hydraulic bulge tests using the shell theory [11]. The dependence of the flow stress on the aspect ratio was investigated by Lazarescu in [12].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Numerical Modelling Considering Plane Strain Material Characterization with an Elliptic Hydraulic Bulge Test

Lenzen¹,

Merklein²

2018

JMMP

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A precise characterization of material behavior is necessary to identify yield criteria or hardening laws for an accurate numerical design of sheet metal forming processes. Current models like Yld2000-2d or Hill'48 do not consider the plane strain state, though this condition is primary cause of failure in deep drawing. It is anticipated that an improved yield locus contour which considers the stress under plane strain conditions leads to better results in numerical simulations of a deep drawing process. Within this contribution, a new experimental setup to characterize both principal stress components under plane strain as additional input data for material modelling is presented. Therefore, hydraulic bulge tests are carried out with a novel elliptical die, which implements a plane strain condition. Moreover, the improvement of the material model is investigated exemplarily for the three sheet metal alloys DC06, DP600 and AA5182. The resulting material parameters are used to identify the yield locus for plane strain by varying the yield locus exponent of Yld2000-2d. The results prove that considering plane strain yield locus results in a better sheet thickness distribution in comparison to conventional modelling of the deep drawing process.

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