Effect of incorporating Lode angle parameter into a fracture criterion in predicting ballistic impact behavior of double-layered 2024-T351 aluminum alloy plates against blunt projectiles

The stress state has an important effect on the deformation and failure of metals. While the stress states of the axisymmetric notched bars specimens are studied in the literature, the studies on the flat metal specimen with inclined notch are very limited and the stress state is not clearly characterized in them. In this paper, digital image correlation and finite element simulations are used to study the distribution of strain and stress state, that is stress triaxiality and Lode angle parameter. Flat specimen with inclined notch was tested to extract the full field strain evolution and calculate stress state parameters at three locations: specimen centre, notch root and failure starting point. It is found that compared with the centre point and the notch root, the failure initiation point can better characterize the influence of the notch angle on the strain evolution. Conversely, the centre point can more clearly characterize the effect of the notch angle on stress state, since the stress states at the failure point and the notch root change greatly during the plastic deformation. Then the calculated stress state parameters of the flat metal specimen with inclined notch at the centre point are used in Wierzbicki stress state diagram to establish a relationship between failure mode and stress state.

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Forming Limit Research of 5182 Aluminum Alloy Sheet Based on Lou-2013 Ductile Fracture Criterion

Journal of Mechanical Engineering ◽

10.3901/jme.2019.16.047 ◽

2019 ◽

Vol 55 (16) ◽

pp. 47 ◽

Cited By ~ 1

Author(s):

YANG Zhuoyun ◽

ZHAO Changcai ◽

DONG Guojiang ◽

CHEN Guang ◽

ZHU Liangjin ◽

...

Keyword(s):

Aluminum Alloy ◽

Ductile Fracture ◽

Fracture Criterion ◽

Alloy Sheet ◽

Forming Limit ◽

Aluminum Alloy Sheet ◽

Ductile Fracture Criterion

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Ballistic impact behavior of composites

Dynamic Deformation, Damage and Fracture in Composite Materials and Structures ◽

10.1016/b978-0-08-100080-9.00015-4 ◽

2016 ◽

pp. 425-470

Author(s):

N.K. Naik

Keyword(s):

Ballistic Impact ◽

Impact Behavior

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Application of the modified Mohr–Coulomb fracture criterion in predicting the ballistic resistance of 2024-T351 aluminum alloy plates impacted by blunt projectiles

International Journal of Impact Engineering ◽

10.1016/j.ijimpeng.2018.09.015 ◽

2019 ◽

Vol 123 ◽

pp. 26-37 ◽

Cited By ~ 17

Author(s):

Xinke Xiao ◽

Hao Pan ◽

Yuanli Bai ◽

Yanshan Lou ◽

Lin Chen

Keyword(s):

Aluminum Alloy ◽

Fracture Criterion ◽

Ballistic Resistance

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Evaluation of Bevarage Can End Forming Process Using Kolmogorov’s Fracture Criterion

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.746.3 ◽

2017 ◽

Vol 746 ◽

pp. 3-9

Author(s):

Vladimir G. Kolobov ◽

Evgenii V. Aryshenskii ◽

Yaroslav A. Erisov ◽

Alexander Nam ◽

Maksim S. Tepterev

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Aluminum Alloy ◽

Stress State ◽

Strain State ◽

Fracture Criterion ◽

Relative Elongation ◽

Rolling Direction ◽

Forming Process ◽

Stress Strain

The present study investigates the process of beverage can end forming from 5182 aluminum alloy. Stress-strain state during forming is analyzed using finite element method in PAM-Stamp 2G, and fracturing probability is evaluated based on V.L. Kolmogorov’s fracture criterion. It is established, that stress state does not provide the sufficient plasticity margin during ends forming. Blank material plasticity resource is depleted during preliminary and reverse drawing stages, defects accumulation during countersink forming is negligible. Minimum relative elongation value, responsible for fracture-free end forming, is 6% in the rolling direction.

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