scholarly journals Fragmentation model for the tensile response of unidirectional composites based on the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength.

2019 ◽  
Vol 16 (7) ◽  
Author(s):  
Juan David Vanegas-Jaramillo ◽  
Iván David Patiño-Arcila
Keyword(s):  
Interfacial Strength ◽  
Fragmentation Model ◽  
Critical Number ◽  
Unidirectional Composites ◽  
Tensile Response ◽  
Fiber Matrix ◽  
Fiber Breaks

scholarly journals Fragmentation model for tensile behavior of intermingled hybrid composites and optimal mixing ratio

2021 ◽  
Author(s):  
Juan David Vanegas- Jaramillo ◽  
Luis Javier Cruz-Riaño ◽  
Iván David Patiño-Arcila
Keyword(s):  
Mechanical Response ◽  
Hybrid Composites ◽  
Progressive Failure ◽  
Interfacial Strength ◽  
Fragmentation Model ◽  
Mixing Ratio ◽  
Strain Behavior ◽  
Damage Process ◽  
High Elongation ◽  
Fiber Breaks

A numerical fragmentation model is proposed to predict the mechanical response of intermingled, unidirectional hybrid composites under tensile loads. The model is based on a previously developed for unidirectional composites considering the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength. Hybrids comprising two reinforcements are considered, and the energetic contribution of reinforcements is evaluated during the damage process. Additionally, the pseudo-ductile strain, yield strength, and the level of degradation of each reinforcement are estimated. The present model is compared with a progressive failure model and micromechanical finite element simulations, obtaining some similarities in the stress-strain behavior.  Results show that both low elongation and high elongation fiber sub-composite experience a linear tensile response where fibers remain intact (IF), and fragmentation (FM) where breaking appears. The sliding/separation phenomenon (SS) occurs in one of the sub-composites when crack saturation is obtained, and failure occurs when the other one undergoes the crack saturation. Results also show that the IF, FM, and SS phenomena are conditioned by the fiber mixing ratio, α. The model allows estimating the optimal value of α for which the highest pseudo-ductile strain and hybrid effect are reached.

Damping in Unidirectional and Cross-Ply Ceramic Matrix Composites With Matrix Cracks

2001 ◽  
Author(s):  
Victor Birman ◽  
Larry W. Byrd
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Interfacial Friction ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Unidirectional Composites ◽  
Matrix Cracks ◽  
Dissipation Of Energy ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Abstract The paper elucidates the methods of estimating damping in ceramic matrix composites (CMC) with matrix cracks. Unidirectional composites with bridging matrix cracks and cross-ply laminates with tunneling cracks in transverse layers and bridging cracks in longitudinal layers are considered. It is shown that bridging matrix cracks may dramatically increase damping in unidirectional CMC due to a dissipation of energy along damaged sections of the fiber-matrix interface (interfacial friction). Such friction is absent in the case of tunneling cracks in transverse layers of cross-ply laminates where the changes in damping due to a degradation of the stiffness remain small. However, damping in cross-ply laminates abruptly increases if bridging cracks appear in the longitudinal layers.

430 Effect of Heat Treatment on Fiber-Matrix Interfacial Strength in C/C composites

2009 ◽  
Vol 2009.17 (0) ◽  
pp. _430-1_-_430-2_
Author(s):  
Yusuke WATANABE ◽  
Takuya YASUNO ◽  
Naomichi SAKAMOTO ◽  
Yasuo KOGO
Keyword(s):  
Heat Treatment ◽  
Interfacial Strength ◽  
Fiber Matrix

scholarly journals Effect of temperature on the fiber/matrix interfacial strength of carbon fiber reinforced polyamide model composites

2016 ◽  
Vol 3 (6) ◽  
pp. 16-00158-16-00158 ◽  
Author(s):  
Kazuto TANAKA ◽  
Nanako HOSOO ◽  
Tsutao KATAYAMA ◽  
Yuki NOGUCHI ◽  
Kazuhiro IZUI
Keyword(s):  
Carbon Fiber ◽  
Interfacial Strength ◽  
Effect Of Temperature ◽  
Fiber Reinforced ◽  
Fiber Matrix ◽  
Carbon Fiber Reinforced

Stress-Strain Response in SiC/SiC Composites under Cyclic Loading

2007 ◽  
Vol 353-358 ◽  
pp. 1406-1409 ◽  
Author(s):  
Jun Ji Ohgi ◽  
S. Tanaka ◽  
T. Kuramoto ◽  
M. Suzuki ◽  
Koichi Goda
Keyword(s):  
Cyclic Loading ◽  
Interfacial Strength ◽  
Maximum Load ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Fracture Load ◽  
Stress Strain ◽  
Pull Out ◽  
Fiber Matrix ◽  
Sic Composites

The tension-tension fatigue tests for SiC/SiC composites were performed under the conditions that the maximum load Pmax was 80-90% to the fracture load of the tensile tests and the stress ratio was Rσ = 0.5. The composites exhibited a width in stress-strain hysteresis loop under one load cycling. In some cases the mean strain εmean gradually increase with increasing in number of cycles. These variations would reflect the developments of the fatigue damage at the fiber/matrix interface during the cyclic loading process. The pull-out lengths of the fibers for the fatigued- and not fatigued-specimens were measured through the SEM observations after the tensile test. In all materials, the average pull-out length of fibers in fatigued material was larger than in not fatigued material because the cyclic loading affected on the fiber/matrix interfacial strength.

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