Session: 01-03 Polymers: Systems Engineering and Design

Paper Number: 93940

93940 - Designing Damage Tolerant Architectures in 3d Printed Pla 

Structures made by additive manufacturing processes are highly anisotropic and carry defects. Complete elimination of these defects is not possible and these defects degrade the mechanical properties such as elastic modulus, tensile strength, and fracture strain. It was recently shown that the optimized volume fraction, size, and shape of these defects can be used to improve the damage tolerance of defect-dominated structures made of brittle materials. There is 20-24 times improvement in damage tolerance has been observed than bulk material [1]. In the present study, mechanical properties are quantified as a function of filling patterns and orientation of building directions in Polylactic Acid (PLA) before incorporating these optimized strategies of defect filling. Damage tolerance has been quantified in terms of work of fracture and it has been observed that hexagonal filling gave better damage tolerance than line filling pattern with zero and 45-degree with respect to crack whereas line filling gave better damage tolerance than hexagonal filling for  90^o  orientation. For further improvement in damage tolerance, PLA has been deposited with Morse code (dot and dash) architectures. Dots type of architecture helps to blunt crack while dash architecture helps to deflect the crack i.e. architectures help to increase the resistance of crack propagation and improve the damage tolerance.

Reference:

1.     Yadav, D., More, T. & Jaya, B. N. (2022). Morse-Code inspired architectures for tunable damage tolerance in brittle material systems. Journal of Materials Research, (Accepted).

Presenting Author: Deepesh Yadav Indian Institute Technology of Bombay

Presenting Author Biography: Mr. Deepesh Yadav is a Ph.D. student in the Department of Metallurgical Engineering and Materials Science, IIT Bombay. He completed his bachelor's in Metallurgical and Materials Engineering, IIT Roorkee in 2017, and subsequently, he has completed his master's in the Department of Metallurgical Engineering and Materials Science, IIT Bombay in 2019. His research interests are fracture mechanics, finite element method, and mechanical behavior of thermal spray coatings. He has 2 articles published in international journals.

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