About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
2025 Graduate Student Poster Contest
|
| Presentation Title |
SPG-15: Optimizing Design & Loading Parameters for Zirconia Compact Tension Testing |
| Author(s) |
Riya Titus, Jason A Griggs, Kartikeya Singh Jodha, Alvaro Della Bona, Paula Benetti, Michael Roach, Susana Salazar Marocho, Yuanyuan Duan, Jeannette Simino |
| On-Site Speaker (Planned) |
Riya Titus |
| Abstract Scope |
This study addresses the need for a simple large crack fracture toughness measurement protocol for use in fine-grained ceramics by adapting the Compact Tension (CT) method from metallic materials (ASTM E399) to advanced dental ceramics.
Eighty-two 3Y-TZP zirconia CT specimens were fabricated from IPS e.max ZirCAD and tested using a hydraulic load frame. Specimens underwent four testing protocols: manual load step increments, programmed load control (1 N/s), cyclic fatigue (10-100 N), and displacement control (0.001 mm/min). Critical design parameters including notch geometry, specimen thickness, and loading alignment were systematically optimized.
Specimens with 1.8-1.9 mm thickness developed visible pre-cracks after sintering, enabling fracture toughness calculations. Digital microscopy-guided notch creation (~5-7mm), improved grip alignment, and pre-crack sharpening eliminated fracture through gripping holes. The loading rate needed to be increased as slow crack growth was seen.
CT methodology may be used for fracture toughness assessment of fine-grained zirconia if optimized. |