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.

Experimental Study of Effect of Adhesives on Strength of Composites Adhesive Joints

2013 ◽  
Vol 690-693 ◽  
pp. 2608-2611
Author(s):  
Yin Huan Yang
Keyword(s):  
Shear Strength ◽  
Failure Modes ◽  
Tensile Loading ◽  
Adhesive Joints ◽  
Uniaxial Tensile ◽  
Braided Composites ◽  
Starting Position ◽  
Tension Tests ◽  
Uniaxial Tensile Loading ◽  
Adhesive Shear Strength

Tension tests on T700/EXOPY unidirectional laminates and 3-D and six-directional braided composites single-lap adhesive joints with different adhesive types under uniaxial tensile loading are performed in the presented paper. Failure modes, strengths and load-displacement curves of two kinds of different adhesive joints are compared and analyzed. According to the experimental results, it is found that the strength of the joints of the smaller adhesive shear strength is less, in contrast, the strength of the joints of the bigger adhesive shear strength is greater, Failure shear strength average is grown 27% relatively. And the starting position of the crack is appeared at the overlap ends, and the whole joint is failed with propagation of the crack.

Fracture Behavior of a Brittle Thin Film on an Elastic Substrate under Residual Stress and Uniaxial Tensile Loading

2012 ◽  
Vol 190-191 ◽  
pp. 487-490 ◽  
Author(s):  
Ban Quan Yang ◽  
Xue Jun Chen ◽  
Wei Hai Sun ◽  
Hong Qian Chen ◽  
Jing Wen Pan ◽  
...  
Keyword(s):  
Thin Film ◽  
Residual Stress ◽  
Shear Stress ◽  
Fracture Behavior ◽  
Tensile Loading ◽  
Interfacial Shear ◽  
Uniaxial Tensile ◽  
Elastic Substrate ◽  
Uniaxial Tensile Loading ◽  
Film Substrate

The fracture behavior of a brittle thin film on an elastic substrate under residual stress and uniaxial tensile loading is investigated. It is assumed that the residual stress in the thin film is not large enough to cause the thin film to fracture. Using a mechanical model presented in this work, the analytical solutions for the distribution laws of the tensile stress developed in the thin film, the shear stress developed along the interface and the relationship between the crack density of the thin film and the applied strain of the substrate can be obtained. The results presented in this work can provide a new analytic solution to the interfacial shear stress for characterizing the interfacial shear strength of the thin film/substrate system when the uniaxial tensile test is adopted to evaluate the mechanical properties of the thin film/substrate system.

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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