scholarly journals Study of the Fractal and Multifractal Scaling Intervening in the Description of Fracture Experimental Data Reported by the Classical Work: Nature 308, 721–722(1984)

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Liliana Violeta Constantin ◽  
Dan Alexandru Iordache
Keyword(s):  
Experimental Data ◽  
Charpy Impact ◽  
Tensile Loading ◽  
Uniaxial Tensile ◽  
Fracture Surfaces ◽  
Classical Work ◽  
Multifractal Scaling ◽  
Uniaxial Tensile Loading ◽  
Representative Points ◽  
The Impact

Starting from the experimental data referring to the main parameters of the fracture surfaces of some 300-grade maraging steel reported by the classical work published in Nature 308, 721–722(1984), this work studied (a) the multifractal scaling by the main parameters of the slit islands of fracture surfaces produced by a uniaxial tensile loading and (b) the dependence of the impact energy to fracture and of the fractal dimensional increment on the temperature of the studied steels heat treatment, for the fracture surfaces produced by Charpy impact. The obtained results were analyzed, pointing out the spectral (size) distribution of the found slit islands in the frame of some specific clusters (fractal components of the multifractal scaling) of representative points of the logarithms of the slit islands areas and perimeters, respectively.

Failure Analysis of Laminates Single-Lap Adhesive Joints under Uniaxial Tensile Loading

2012 ◽  
Vol 490-495 ◽  
pp. 2201-2204
Author(s):  
Yin Huan Yang
Keyword(s):  
Shear Stress ◽  
Tensile Loading ◽  
Adhesive Joints ◽  
Experimental Results ◽  
Uniaxial Tensile ◽  
Tension Tests ◽  
Different Types ◽  
Uniaxial Tensile Loading ◽  
Overlap Area ◽  
Main Factor

Tension tests on three different types of T700/EXOPY unidirectional laminates single-lap adhesive joints under uniaxial tensile loading were performed and effect of adherend thickness and spew fillets on strength of single-lap adhesive joints were analyzed in this paper. According to the experimental results, it is found that joint strength was not linear with the adherend thickness and much affected by spew fillets in overlap ends. At the same time, finite element simulations are carried out to analyze the peel/shear stress fields along joint interfaces and the intermediate layer of adhesive. The simulation results show that it is the main factor to leading to joint failure that the maximum peel/shear stress is occurred at overlap area edges and peel/shear stress of joints with spew fillet at the overlap area edges is less than that of joints with no spew fillet. Good agreements between the present simulations and the experimental results are found.

Correlation Study of IR TNDT Analysis with Structural Failure Modes of Carbon-Fabric-Reinforced Epoxy Composites

2015 ◽  
Vol 10 (1) ◽  
pp. 155892501501000 ◽  
Author(s):  
Vasanthanathan Arunachalam ◽  
P. Nagaraj
Keyword(s):  
Failure Modes ◽  
Epoxy Composite ◽  
Tensile Loading ◽  
Matrix Cracking ◽  
Strength Parameter ◽  
Uniaxial Tensile ◽  
Carbon Fabric ◽  
Plane Shear ◽  
Microstructural Investigation ◽  
Uniaxial Tensile Loading

In the present work, a generic experimental investigation procedure was developed on mechanical characterization and testing of carbon fabric/epoxy material under uniaxial tensile loading condition. In this study, using IR Thermographic NDT, the defects are identified by measuring changes in temperature online during testing and by taking temperature contour images on the surface of the composite samples. The unidirectional elastic properties such as tensile modulus, in-plane shear modulus, Poisson's ratio, and strength parameter like ultimate tensile strength, shear strength are reported. The estimated mechanical properties of carbon fabric/ epoxy composite were statistically analysed in this work using the Weibull distribution. In addition, emphasis on the microstructural investigation using Scanning Electron Microscope (SEM) is given, in order to study the fracture mechanism of the carbon fabric/epoxy composite under uniaxial tensile loading. The failure surfaces of the tensile tested carbon fabric/epoxy specimens were examined by SEM and the detailed fracture process such as matrix cracking, fiber pull outs and delamination are observed and discussed.

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