Modelling of Fatigue Delamination Growth and Prediction of Residual Tensile Strength of Thermoplastic Coupons
Abstract
:1. Introduction
2. Experimental Methods
- Five coupons were tested in tension to characterize the reference tensile behavior of the thermoplastic material.
- Five coupons were tested in fatigue to characterize the reference tension–tension fatigue behavior of the thermoplastic material.
- Thirteen coupons were tested in fatigue to monitor the progressive fatigue damage through Ultrasonic C-Scan images.
- Six specimens were subjected to fatigue up to cycles equal to 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 of the average fatigue life of the coupons that have undergone interrupted fatigue testing.
- The six fatigued coupons were tested in tension to measure the residual tensile stiffness and strength of the coupons.
3. Numerical Procedure
3.1. Quasi-Static Progressive Damage Model
3.2. Fatigue Crack Growth Model
3.3. FE Models
4. Comparison of Numerical and Experimental Results
4.1. Tensile Behavior
4.2. Fatigue Life
4.3. Fatigue Delamination
4.4. Residual Tensile Strength
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Damage Types | Fiber Damage Modes | Matrix Damage Modes | |||||
---|---|---|---|---|---|---|---|
Damage Modes | Mode 1 j = 1 | Mode 2 j = 2 | Mode 3 j = 3 | Mode 4 j = 4 | Mode 5 j = 5 | Mode 6 j = 6 | |
Moduli | |||||||
E11 | 1 | 1 | 1 | 0 | 0 | 0 | |
E22 | 0 | 0 | 1 | 1 | 1 | 0 | |
E33 | 0 | 0 | 1 | 0 | 0 | 1 | |
G12 | 1 | 1 | 1 | 1 | 1 | 0 | |
G23 | 0 | 0 | 1 | 1 | 1 | 1 | |
G13 | 1 | 1 | 1 | 0 | 0 | 1 |
Mechanical Property | Value | |
---|---|---|
ρ [ton/mm3] | Density | 1.75 × 10−9 |
E11 [MPa] | Youngs’ Modulus—longitudinal direction | 95,000 |
E22 [MPa] | Youngs’ Modulus—transverse direction | 8500 |
E33 [MPa] | Youngs’ Modulus—through thickness direction | 8500 |
v21 [-] | Poison’s ratio in 21 direction | 0.027 |
v31 [-] | Poison’s ratio in 31 direction | 0.024 |
v32 [-] | Poison’s ratio in 32 direction | 0.172 |
G12 [MPa] | Shear Modulus in 12 direction | 4300 |
G23 [MPa] | Shear Modulus in 23 direction | 3571.4 |
G13 [MPa] | Shear Modulus in 13 direction | 4300 |
S1T [MPa] | Longitudinal tensile strength | 4000 |
S2T [MPa] | Transverse tensile strength | 150 |
S3T [MPa] | Trough thickness tensile strength | 300 |
Traction–Normal direction [MPa] | - | 86 |
Traction–Transverse direction [MPa] | - | 42 |
GI,c [N•mm] | Strain energy release rate of Mode I | 2.1 |
GII,c [N•mm] | Strain energy release rate of Mode II | 2.6 |
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Tsivouraki, N.; Tserpes, K.; Sioutis, I. Modelling of Fatigue Delamination Growth and Prediction of Residual Tensile Strength of Thermoplastic Coupons. Materials 2024, 17, 362. https://doi.org/10.3390/ma17020362
Tsivouraki N, Tserpes K, Sioutis I. Modelling of Fatigue Delamination Growth and Prediction of Residual Tensile Strength of Thermoplastic Coupons. Materials. 2024; 17(2):362. https://doi.org/10.3390/ma17020362
Chicago/Turabian StyleTsivouraki, Niki, Konstantinos Tserpes, and Ioannis Sioutis. 2024. "Modelling of Fatigue Delamination Growth and Prediction of Residual Tensile Strength of Thermoplastic Coupons" Materials 17, no. 2: 362. https://doi.org/10.3390/ma17020362