2021
DOI: 10.1186/s10033-021-00549-4
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Comparison of Modified Mohr–Coulomb Model and Bai–Wierzbicki Model for Constructing 3D Ductile Fracture Envelope of AA6063

Abstract: Ductile fracture of metal often occurs in the plastic forming process of parts. The establishment of ductile fracture criterion can effectively guide the selection of process parameters and avoid ductile fracture of parts during machining. The 3D ductile fracture envelope of AA6063-T6 was developed to predict and prevent its fracture. Smooth round bar tension tests were performed to characterize the flow stress, and a series of experiments were conducted to characterize the ductile fracture firstly, such as no… Show more

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Cited by 10 publications
(2 citation statements)
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“…Experimental tests characterized by different loading conditions allow to obtain points on the fracture space (T, X, ε f ) that are different from one another, which is mandatory for a sound calibration of damage models. In the present work, experimental tests widely used in the literature, 19,20,25,26 such as tensile test on round bar (RB) or notched bar (RNB) samples, torsion (Tors), tensile tests in plane strain condition (PS), and compression (Compr), were chosen to investigate the behavior of T, X, and ε p , numerically. In addition, another simple multiaxial test was selected, employing a less conventional specimens proposed by Driemeier et al, 27 through which it is possible analyze material ductility and fracture in the regime of low triaxiality.…”
Section: Methodsmentioning
confidence: 99%
“…Experimental tests characterized by different loading conditions allow to obtain points on the fracture space (T, X, ε f ) that are different from one another, which is mandatory for a sound calibration of damage models. In the present work, experimental tests widely used in the literature, 19,20,25,26 such as tensile test on round bar (RB) or notched bar (RNB) samples, torsion (Tors), tensile tests in plane strain condition (PS), and compression (Compr), were chosen to investigate the behavior of T, X, and ε p , numerically. In addition, another simple multiaxial test was selected, employing a less conventional specimens proposed by Driemeier et al, 27 through which it is possible analyze material ductility and fracture in the regime of low triaxiality.…”
Section: Methodsmentioning
confidence: 99%
“…It explains well most experimental observations and is relatively easy to calibrate. For the damage model, fracture is postulated to occur when the accumulated equivalent plastic strain reaches a critical value which is a function of the stress state (stress triaxiality and Lode parameter) [18,19]. This stress state dependent damage model was validated by Lee et al [20], Bai et al [21], Gilioli et al [22], Sandburg et al [23] and Habib et al [24] with experiments on different materials.…”
Section: Introductionmentioning
confidence: 99%