Fatigue limit prediction model and fatigue crack growth mechanism for selective laser melting Ti6Al4V samples with inherent defects

2021 ◽  
Vol 143 ◽  
pp. 106008
Author(s):  
Zhongwei Xu ◽  
An Liu ◽  
Xishu Wang ◽  
Bin Liu ◽  
Minghai Guo
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Prediction Model ◽  
Crack Growth ◽  
Fatigue Limit ◽  
Selective Laser Melting ◽  
Growth Mechanism ◽  
Laser Melting ◽  
Crack Growth Mechanism

Fatigue Crack Growth Rates and Tensile Strength of Titanium Produced by Means of Selective Laser Melting

2014 ◽  
Vol 627 ◽  
pp. 305-308 ◽  
Author(s):  
Tomasz Brynk ◽  
Barbara Romelczyk ◽  
Zbigniew Pakiela ◽  
Tomasz Kurzynowski ◽  
Edward Chlebus
Keyword(s):  
Mechanical Properties ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Selective Laser Melting ◽  
Pure Titanium ◽  
Tensile Tests ◽  
Image Correlation ◽  
Laser Melting ◽  
Full Field

Mini-samples technique was utilized to determine mechanical properties of technically pure titanium produced by means of selective laser melting (SLM). Full-field digital image correlation (DIC) measurements and inverse method were applied for crack tip position and stress intensity factors calculations in the case of fatigue crack growth rate tests. DIC was also used for strain measurement during tensile tests on sub sized samples. There was studied the influence of samples orientation on the mechanical properties of mini-samples. Samples were cut out from rectangular cubes and were oriented with 0°, 45° or 90° angle to the direction of laser beam travel. There were also tested samples directly produced via SLM. Additionally microstructure observations were performed to verify the quality of SLM processed materials and explain mechanical properties variations.

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