Characterization of Interlaminar Fracture Properties of Advanced Polymer Matrix Composites Interleaved With Buckypaper

2016 ◽  
Author(s):  
Masoud Yekani Fard ◽  
John M. Woodward ◽  
Siddhant Datta ◽  
Brian Raji ◽  
Aditi Chattopadhyay
Keyword(s):  
High Speed ◽  
Polymer Matrix Composites ◽  
Beam Theory ◽  
High Yield ◽  
Mode I ◽  
Design Guideline ◽  
Fracture Properties ◽  
Interlaminar Fracture ◽  
Manufacturing Method ◽  
Calibration Methods

Recently a novel high-speed/high-yield surfactant-free manufacturing method has been developed for manufacturing of large size buckypaper. In spite of this development, there is no data on the effects of microstructural characteristics on the structural properties of surfactant-free buckypaper based nanocomposites. This investigation examines the effects of the proposed manufacturing procedure on the resultant interlaminar fracture properties of buckypaper based nanocomposites. Buckypaper samples were fabricated using the novel surfactant-free technique. Buckypaper based nanocomposite samples were subjected to mode I, II, and I-II fracture testing in Double Cantilever Beam (DCB ), End Notched Flexure (ENF) and 4-point End Notched Flexure (4ENF), and Mixed Mode Bending (MMB) configurations, respectively. Analysis of the test specimens in terms of mode I energy release rates showed good agreement among Modified Beam Theory, Compliance Calibration, and Modified Compliance Calibration methods. ENF and 4ENF tests gave very consistent crack initiation and propagation results for mode II fracture. The fracture envelope function of the composite and the nanocomposites was developed as a design guideline for nanocomposite materials.

Mode-I and mode-II interlaminar fracture properties of high modulus pitch-based carbon fiber reinforced polymers containing different nanostructures

2021 ◽  
pp. 002199832110492
Author(s):  
Kimiyoshi Naito ◽  
Chiemi Nagai
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforced Polymers ◽  
Mode I ◽  
Mode Ii ◽  
High Modulus ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Sic Nanoparticles ◽  
Fracture Properties ◽  
Interlaminar Fracture

The mode-I and mode-II interlaminar fracture properties of high modulus pitch-based carbon fiber reinforced polymers (CFRPs) (fiber: K13C; resin: EX-1515 cyanate ester) modified with 20–30 nm β-SiC nanoparticles or multiwalled-carbon nanotubes (MWCNTs) were investigated. Different volume fractions of both the β-SiC nanoparticles (1, 2, 5, and 10 vol%) and MWCNTs (1, 3, 5, and 7 vol%) were tested. The values of the mode-I and mode-II interlaminar fracture toughness of the CFRPs containing the lowest volume fractions of these nanostructures were larger compared with the unfilled composite but decreased with increasing the volume fraction of the inclusions. No differences in mechanical properties were observed among the different nanostructure types.

Nanoscale Interphase Characterization of Agglomerated MWCNT in Composites Connected to Mode I Fracture

2020 ◽  
Author(s):  
Masoud Yekani Fard ◽  
Alek Pensky ◽  
Jack Mester
Keyword(s):  
Mechanical Properties ◽  
Polymer Matrix Composites ◽  
Reference Sample ◽  
Sample Surface ◽  
Mapping Technique ◽  
Mode I ◽  
Interlaminar Fracture ◽  
Mode I Fracture ◽  
Fracture Testing ◽  
Fracture Performance

Abstract The authors investigate the effect of carbon nanotubes (CNT) on the microstructure, nanomechanical properties, and fracture performance of three-phase polymer matrix composites (PMC). Two types of carbon fiber (CF)-Epoxy-CNT composites with different nanofiller distribution were studied at the nanoscale with PeakForce Quantitative Nanomechanical mapping technique (PFQNM) and macroscale with mode I fracture testing to clarify the relationship between nanofiller interphase properties and mode I fracture performance. CNT agglomerates were identified on the polished sample surface in well-dispersed and agglomerated form. AFM data showed the inhomogeneity of nanoscale local mechanical properties in CNT-rich zones. Variation in material properties is attributed to voids, CNT alignment, and changes in density of the matrix and CNT nanoparticles. A higher resolution AFM scanner and Field Emission Scanning Electron Microscopy are necessary to observe nano-scale interphase mechanical properties and CNT orientation, respectively. Mode I interlaminar fracture testing demonstrated the effectiveness of CNT nanoparticles in preventing crack-jump and fiber-bridging effects. GIC for FCNT is 0.345±0.06 N-mm/mm2 at crack initiation, compared to 0.28±0.03 N-mm/mm2 for the plain epoxy reference sample. CNT nanoparticles increase the energy required for interlaminar fracture by promoting crack deflection and strengthening the interphase between CF and epoxy matrix through increased interfacial surface area.

scholarly journals A Wedge-DCB Test Methodology to Characterise High Rate Mode-I Interlaminar Fracture Properties of Fibre Composites

2018 ◽  
Vol 183 ◽  
pp. 02052 ◽  
Author(s):  
Sathiskumar A. Ponnusami ◽  
Hao Cui ◽  
Borja Erice ◽  
Mehtab V. Pathan ◽  
Nik Petrinic
Keyword(s):  
Crack Opening ◽  
High Rate ◽  
Experimental Methodology ◽  
Dynamic Mode ◽  
Mode I ◽  
Fiber Reinforced ◽  
Fracture Properties ◽  
Interlaminar Fracture ◽  
Cohesive Zone Modelling ◽  
High Level

A combined numerical-experimental methodology is presented to measure dynamic Mode-I fracture properties of fiber reinforced composites. A modified wedge-DCB test using a Split-Hopkinson Bar technique along with cohesive zone modelling is utilised for this purpose. Three different comparison metrics, namely, strain-displacement response, crack propagation history and crack opening history are employed in order to extract unique values for the cohesive fracture properties of the delaminating interface. More importantly, the complexity of dealing with the frictional effects between the wedge and the DCB specimen is effectively circumvented by utilising right acquisition techniques combined with an inverse numerical modelling procedure. The proposed methodology is applied to extract the high rate interlaminar fracture properties of carbon fiber reinforced epoxy composites and it is further shown that a high level of confidence in the calibrated data can be established by adopting the proposed methodology.

scholarly journals Effect of Mold Cooling Rate on Mode I and II Interlaminar Fracture Properties of CF/PPS Thermoplastic Composite

2019 ◽  
Vol 45 (6) ◽  
pp. 242-250
Author(s):  
Yuta NAKAGAWA ◽  
Soshi ODA ◽  
Nobuhide UDA ◽  
Yasuhisa SHINMOTO ◽  
Hiroto NAGAI ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Thermoplastic Composite ◽  
Mode I ◽  
Fracture Properties ◽  
Interlaminar Fracture

The Effects of In-Service Induced Reduction of Bonding Quality on the Mode I, II, and I-II Fracture Toughness of CNT Nanocomposites

2016 ◽  
Author(s):  
Masoud Yekani Fard ◽  
Brian Raji ◽  
John M. Woodward ◽  
Aditi Chattopadhyay
Keyword(s):  
Fracture Toughness ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Accelerated Aging ◽  
Beam Theory ◽  
Mode I ◽  
Mode Ii ◽  
Initiation And Propagation ◽  
Calibration Methods

Tests were carried out to determine the interlaminar fracture toughness of stitch-bonded biaxial polymer matrix carbon nanotube nanocomposites for mode I, II, and I-II including durability effects. Analysis of the test specimens in terms of mode I energy release rates showed good agreement among Modified Beam Theory, Compliance Calibration, and Modified Compliance Calibration methods. End-Notched Flexure (ENF) and four point End-Notched Flexure (4ENF) tests gave very consistent crack initiation and propagation results for mode II fracture. The results show that the critical mode I energy release rate for delamination decreases monotonically with increasing mode II loading. The effects of accelerated aging (60°C and 90% Rh) on fracture properties were studied. Early accelerated aging (0–12 months) has the dominant diminishing effect on energy release rate initiation and propagation in composites and nanocomposites.

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