Composite Interlaminar Shear Fracture Toughness,

2009 ◽  
pp. 3-3-16 ◽  
Author(s):  
TK O'Brien
Keyword(s):  
Fracture Toughness ◽  
Shear Fracture ◽  
Interlaminar Shear

Mixed Experimental‐Structural Model for Interlaminar Shear Fracture Toughness

1991 ◽  
Vol 4 (1) ◽  
pp. 108-125 ◽  
Author(s):  
William E. Bachrach ◽  
Thomas R. Hicks ◽  
Zbigniew S. Habas ◽  
Dianne M. Granata
Keyword(s):  
Fracture Toughness ◽  
Structural Model ◽  
Shear Fracture ◽  
Interlaminar Shear

Adhesive thickness influence on the shear fracture toughness measurements of adhesive joints

2018 ◽  
Vol 83 ◽  
pp. 15-23 ◽  
Author(s):  
J.C.P. Figueiredo ◽  
R.D.S.G. Campilho ◽  
E.A.S. Marques ◽  
J.J.M. Machado ◽  
L.F.M. da Silva
Keyword(s):  
Fracture Toughness ◽  
Shear Fracture ◽  
Adhesive Joints ◽  
Adhesive Thickness

Effect of Graphene Oxide on Interfacial Interactions and Fracture Toughness of Basalt Fiber-Reinforced Epoxy Composites

2020 ◽  
Vol 20 (11) ◽  
pp. 6760-6767
Author(s):  
Seong Hwang Kim ◽  
Soo-Jin Park
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Graphene Oxide ◽  
High Performance ◽  
Basalt Fiber ◽  
Superior Performance ◽  
Microstructured Fibers ◽  
Multi Scale ◽  
Fundamental Understanding ◽  
Interlaminar Shear

Multiscale hierarchy is a promising chemical approach that provides superior performance in syner-gistically integrated microstructured fibers and nanostructured materials in composite applications. The main purpose of this work was to introduce graphene oxide (GO) between an epoxy matrix and basalt fibers to improve mechanical properties by enhancing interfacial adhesion. The composites were reinforced with various concentrations of GO. For all of the fabricated composites, the optimum GO content was found to be 0.5 wt%, which improved the interlaminar shear strength and fracture toughness by 66.2% and 86.1%, respectively, compared with those of neat composites. We observed a direct linear relationship between fracture toughness and certain surface free energy. In addition, the fracture toughness mechanisms were illustrated using a crack theory based on morphology analyses of fracture surfaces. Such an effort could accelerate the conversion of multi-scale composites into high-performance materials and provide rational guidance and fundamental understanding toward realizing the theoretical limits of mechanical properties.

scholarly journals Comparison of different test configurations for the shear fracture toughness evaluation of a ductile adhesive

2019 ◽  
Vol 38 ◽  
pp. 940-947
Author(s):  
A.J.S. Leal ◽  
R.D.S.G. Campilho ◽  
F.J.G. Silva ◽  
D.F.O. Silva ◽  
F.J.P. Moreira
Keyword(s):  
Fracture Toughness ◽  
Shear Fracture ◽  
Toughness Evaluation ◽  
Fracture Toughness Evaluation

scholarly journals Effects of Piezoceramic Particle Addition on the Fracture Toughness Behaviour of CF/EP – Composites

2005 ◽  
Vol 14 (4) ◽  
pp. 096369350501400
Author(s):  
Patrick Rosso ◽  
T. Tanimoto ◽  
Klaus Friedrich
Keyword(s):  
Fracture Toughness ◽  
Piezoelectric Ceramic ◽  
Tensile Tests ◽  
Interlaminar Shear Strength ◽  
Interlaminar Fracture Toughness ◽  
Short Beam ◽  
Beam Shear ◽  
Fracture Surface Analysis ◽  
Interlaminar Shear ◽  
Particle Addition

In this study, the influence of piezoelectric ceramic particles (PZT) on a continuous carbon fibre (CF) reinforced epoxy was investigated. Therefore, unidirectional laminates were produced via film stacking in an autoclave. Mode-I interlaminar fracture toughness tests were carried out as well as tensile tests and short beam shear test to evaluate E-modulus and interlaminar shear strength (ILSS), respectively. The amount of PZT was varied and additional fracture surface analysis by scanning electron microscopy (SEM) clarified how the PZT affects the GIC of the particular laminates. It was found, that the addition of the PZT-particles caused a significant decrease in fracture toughness, whereas stiffness and ILSS were effected only marginally.

Estimation of transverse-shear fracture toughness for an hsla steel

1983 ◽  
Vol 22 (2) ◽  
pp. R65-R67 ◽  
Author(s):  
M. T. Miglin ◽  
J. P. Hirth ◽  
A. R. Rosenfield
Keyword(s):  
Fracture Toughness ◽  
Transverse Shear ◽  
Shear Fracture ◽  
Hsla Steel

Dynamic Fracture Toughness and Charpy Transition Properties of a Service-Exposed 2.25Cr-1Mo Reheater Header Pipe

2003 ◽  
Vol 125 (2) ◽  
pp. 227-233 ◽  
Author(s):  
P. R. Sreenivasan ◽  
C. G. Shastry ◽  
M. D. Mathew ◽  
K. Bhanu Sankara Rao ◽  
S. L. Mannan ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Dynamic Fracture ◽  
Prolonged Exposure ◽  
Residual Life ◽  
Shear Fracture ◽  
Temper Embrittlement ◽  
Dynamic Fracture Toughness ◽  
Life Extension ◽  
Virgin Material ◽  
Fracture Appearance Transition Temperature

Residual life analysis of power plant components like boiler tubes, superheater outlet headers, reheater headers, steam pipes, etc., is important for life extension and avoidance of catastrophic failure. In this context, fracture toughness is very important. The fracture characteristics after prolonged exposure to high temperatures and pressures are likely to be different from that of the virgin material. 2.25Cr-1Mo reheater header pipe exposed at 813 K for 120,000 h was studied by instrumented impact tests (IIT) to evaluate dynamic fracture toughness and Charpy transition properties. The methods presented in this paper for estimating dynamic fracture toughness from IIT of Charpy specimens give reliably conservative results without the need for precracking. For estimating fracture appearance transition temperature (FATT) from IIT load-time traces, the equation for percent shear fracture, PSF3, gives the best 1:1 correlation with measured values from fracture surfaces. The lower bound equation for variation of fracture toughness with temperature derived in the present study is higher than that obtained from the FATT master curve (FATT-MC) approach. Comparison of Charpy indices like FATT and upper-shelf energy for the service exposed steel to results for the virgin material reported in the literature and the compositional J-Factor estimates for temper-embrittlement susceptibility indicate that the present steel, even after 120,000 h exposure to high temperature service, has probably undergone only very little or nil degradation in toughness properties.

Surface Modification of PBO Fibres by Gamma-Ray Irradiation: Effects on Interfacial Properties of their Epoxy Composites

2005 ◽  
Vol 13 (3) ◽  
pp. 263-270
Author(s):  
C.H. Zhang ◽  
Y.D. Huang ◽  
L. Liu
Keyword(s):  
Shear Strength ◽  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Gamma Ray ◽  
Surface Composition ◽  
Shear Fracture ◽  
Fibre Surface ◽  
Fracture Topography ◽  
Gamma Ray Irradiation ◽  
Interlaminar Shear

The surfaces of poly [p-phenylene benzobisoxazole] (PBO) fibres were grafted with epichlorohydrin by a gamma (γ)-ray irradiation method. The influence of irrdiation dose on the interfacial shear strength (IFSS), interlaminar shear strength (ILSS) and the fibre wettability were investigated. In addition, the fibre surface composition, and the shear fracture topography of PBO fibre/epoxy resin composites were analysed by X–ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively. The results indicate that a dose of 30KGy was the optimal condition for PBO fibre surface modification. The oxygen content of the irradiated PBO fibres was 22% higher than that of the untreated ones, and chlorine atoms were introduced onto the surface of the fibres through grafting actions between epichlorohydrin and PBO. The wettability of the epichlorohydrin-grafted PBO fibres was significantly increased, and the values of IFSS and ILSS of its composites were increased by 70% and 135%, respectively. SEM shows that the improved interfacial adhesion resulted in a change in the failure mode of PBO fibre/epoxy composite from an adhesive-type interfacial failure to a cohesive-like matrix failure.

Sign in / Sign up

Export Citation Format

Share Document