@Article{icces.2023.010553,
AUTHOR = {Baisen Gao, Wei Huang, Shengnan Wang},
TITLE = {Prediction of Ductile Fracture for Ti-6Al-4V Alloy Fabricated by L-PBF  Based on Unit Cell Calculations},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {27},
YEAR = {2023},
NUMBER = {4},
PAGES = {1--2},
URL = {http://www.techscience.com/icces/v27n4/55222},
ISSN = {1933-2815},
ABSTRACT = {Additive manufacturing of metallic components can result in initial defects that significantly reduce their 
mechanical properties [1]. Therefore, there has been considerable interest in studying the fracture and 
damage behavior of such components through theoretical and experimental studies [2, 3]. Developing a 
reliable model for predicting the ductile fracture of additively manufactured components is currently of 
great importance. In this study, we conducted unit cell calculations with the calibration of experimental tests 
to investigate the ductile fracture of Ti-6Al-4V alloy fabricated through additive manufacturing. The stress 
triaxiality and Lode parameter were enforced constant for the voided cubic unit cell model during the 
loading. An energy-based criterion was employed to identify the onset of void coalescence [4, 5], and the 
macroscopic effective strain corresponding to the minimum value of the energy work ratio was considered 
as the failure strain for a certain stress state. We determined the initial void fraction of the unit cell by 
conducting tensile tests on a series of specimens with different notch radii, which provided several different 
stress states. Note that finite element analysis was used to calibrate the internal parameters of specimens, 
such as the distribution of stress states and effective strain [6]. Our proposed unit cell model successfully 
predicted the failure strain for Ti-6Al-4V alloy fabricated by L-PBF under different stress states, and the test 
results confirmed its accuracy. Our study provides valuable insights for designing and applying metallic 
additive manufacturing in the future.<br/>
<img src="https://www.techscience.com/files/icces/image/10553.png" width="600px"><br/>
The specimens used in this study are shown in Fig. (a) The different geometries of notched specimens provide a 
series of stress states. The finite element analysis results fit well with the experimental data are shown in Fig. (b) 
Note that the inside parameters of specimens are obtained from numerical simulation. The unit cell model and the energy work rate ratio are depicted in Fig. (c) and Fig. (d), respectively, where the effective plastic 
deformation distribution also presented. In this study, the failure strain is considered as the function of 
stress triaxiality, Lode parameter and initial void fraction for unit cell calculation. Fig. (e) shows the failure 
strain from obtained both unit cell calculations and experimental tests under different stress states, 
indicating the high accuracy of the unit cell calculation in predicting ductile fracture of additively 
manufactured Ti-6Al-4V alloy.
},
DOI = {10.32604/icces.2023.010553}
}