Session: MF-05-01 Fitness-For-Service and Failure Assessment-1

Paper Number: 121913

121913 - Structural Integrity Evaluation of 3d Printed Graphene-Reinforced Pla Notched Plates Using Failure Assessment Diagrams 

Failure Assessment Diagrams (FADs) constitute a well-known structural integrity evaluation tool that allows structural components containing crack-like defects to be assessed though a simultaneous analysis of fracture and plastic-collapse processes. FADs are included in the most recognized structural integrity assessment procedures/standards, such as BS7910 and API 579/ASME FFS-1, and their use is generally limited to metallic components containing crack-like defects.

On the other hand, 3D printed composites, and particularly those obtained trough FFF (Fused Filament Fabrication), are assuming structural responsabilities beyond their most extended use as prototyping materials. The resulting structural components may contain notch-type defects (e.g., grooves, corners, holes, etc.) that determine their corresponding structural integrity. Thus, it is necessary to define structural integrity assessment criteria for this kind of materials when containing any kind of stress risers, beyond crack-like defects.

This work justifies the use of BS7910 Level 1 FAD, coupled with a notch correction derived from the Theory of Critical Distances (TCD), to analyze graphene-reinforced PLA plates subjected to pure tensile loading conditions and containing U- and V- notches. The results reveal that the assessment points representing the plates at failure are located within the FAD area corresponding to unsafe conditions, providing conservative evaluations with moderate safety margins.

Presenting Author: Sergio Cicero University of Cantabria

Presenting Author Biography: PhD in Civil Engineering (2007), he is now Full Professor of Materials Science and Metallurgical Engineering at the University of Cantabria. He has published more than 200 papers on structural integrity related topics, with special emphasis on notch mechanics.
He is vice-chair of ASME Section Spain.

Authors:

Sergio Cicero University of Cantabria
Sergio Arrieta University of Cantabria
Marcos Sánchez University of Cantabria