| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Quantification of Fatigue Crack Growth Rates and Fatigue-creep Load Interaction Effects of Heterogeneous Fiber Networks via Thresholded Strain Fields |
| Author(s) |
Sarah A. Paluskiewicz, Yoon Joo Na, Christopher L. Muhlstein |
| On-Site Speaker (Planned) |
Sarah A. Paluskiewicz |
| Abstract Scope |
Paper is a heterogenous, anisotropic fiber network with ubiquitous applications. The interlocking fiber network of paper makes it challenging to precisely quantify crack growth over time or cycles. To overcome this difficulty, we thresholded strain maps generated from non-contact digital image correlation in the region around the crack tip at a consistent value (εyy = 0.05) above the fracture strain (εUTS = 0.035). Then we computed crack growth rates (10^-6 to 10^-2 mm/cycle) from fatigue tests with stress amplitudes (5 to 10.8 MPa) that fell between the notched yield strength and notched tensile strength. By studying the crack profile, we identified that for sufficiently high-cycle fatigue, damage accumulation occurs by fiber fracture. This contracted from inter-fiber damage mechanisms found in tensile, creep, and ratchetting. Finally, we found that by alternating specific loading conditions, crack growth rates decreased. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Thin Films and Interfaces, Biomaterials |