An Impregnation Technique for Crack Identification Following Uniaxial Tension Tests

2011 ◽  
Vol 275 ◽  
pp. 51-54 ◽  
Author(s):  
Dariusz Alterman ◽  
Hiroshi Akita ◽  
Thomas Rainer Neitzert ◽  
Justyna Alterman
Keyword(s):  
Epoxy Resin ◽  
Uniaxial Tension ◽  
Ultraviolet Light ◽  
Fluorescent Dye ◽  
Crack Identification ◽  
Uniaxial Tensile ◽  
Tensile Behaviour ◽  
Tension Tests ◽  
Impregnation Technique

This paper is dedicated to an impregnation technique for crack identification of uniaxial tensile behaviour of concrete samples. A method for crack identification in concrete after uniaxial tension tests was adopted for the observation of differences between various experiments which were conducted with and without the elimination of secondary flexure. During the procedure an epoxy resin containing fluorescent dye was infused into concrete samples by vacuum to expose cracks and defects. After impregnation the samples were sawed from the prism and pictures taken under ultraviolet light.

A State Variable Modeling of Plasticity and Necking Under Uniaxial Tension

1992 ◽  
Vol 114 (4) ◽  
pp. 378-383 ◽  
Author(s):  
G. Ferron ◽  
H. Karmaoui Idrissi ◽  
A. Zeghloul
Keyword(s):  
Strain Rate ◽  
Uniaxial Tension ◽  
Plastic Flow ◽  
Constitutive Equations ◽  
Growth Process ◽  
Constant Strain Rate ◽  
Uniaxial Tensile ◽  
Long Wavelength ◽  
State Variable ◽  
Diffusion Controlled

Constitutive equations based on a state variable modeling of the thermo-viscoplastic behavior of metals are discussed, and incorporated in an exact, long-wavelength analysis of the neck-growth process in uniaxial tension. The general formalism is specialized to the case of f.c.c. metals in the range of intragranular, diffusion controlled plastic flow. The model is shown to provide a consistent account of aluminum behavior both under constant strain-rate and creep. Calculated uniaxial tensile ductilities and rupture lives in creep are also compared with experiments.

The tensile behaviour of biaxial and triaxial braided fabrics

2016 ◽  
Vol 47 (8) ◽  
pp. 2184-2204 ◽  
Author(s):  
Duchamp Boris ◽  
Legrand Xavier ◽  
Soulat Damien
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Mechanical Behaviour ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Tensile Behaviour ◽  
Linear Mass ◽  
Double Peak ◽  
Specific Behaviour ◽  
Braiding Angle

The tensile behaviour of braid reinforcement is classically described by the behaviour of composite elaborated from these reinforcements. Few studies concern the tensile behaviour of braided fabrics. In this paper biaxial and triaxial braids are manufactured on a braiding loom. The evolution of key parameters as linear mass and braiding angle in function of process parameters is presented. Braid reinforcements are characterized in uniaxial tensile. The mechanical behaviour is analysed and compared in function of the braiding angle, but also different kinds of braid are considered. A specific behaviour called “double-peak” is identified for triaxial braids which have a higher braiding angle. The evolution of the braiding angle measured during tensile tests gives a comprehension on the mechanical behaviour of dry braids. Associated with this experimental study, an analytical model is also proposed, to predict mechanical properties of braid reinforcements.

Orthotropic Characteristics of Glass-Fibre-Epoxy Laminates under Plane Stress

1973 ◽  
Vol 15 (2) ◽  
pp. 102-108 ◽  
Author(s):  
R. M. Ogorkiewicz
Keyword(s):  
Tensile Strength ◽  
Epoxy Resin ◽  
Uniaxial Tension ◽  
Plane Stress ◽  
Glass Fibre ◽  
Orthotropic Material ◽  
Glass Fibres ◽  
Degree Of Anisotropy

Deformational characteristics of laminates of unidirectionally arranged glass fibres and epoxy resin under plane stress are shown to correspond very closely under uniaxial tension and, to a lesser extent, under shear to the theroetical pattern of stiffness of an orthotropic material. The anisotropy in stiffness is also shown to be accompanied by an even greater degree of anisotropy in tensile strength.

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.

Effect of Cold Storage on Mechanical Properties of Aorta

2015 ◽  
Author(s):  
Shijia Zhao ◽  
John Lof ◽  
Shelby Kutty ◽  
Linxia Gu
Keyword(s):  
Mechanical Properties ◽  
Uniaxial Tension ◽  
Cold Storage ◽  
Elastic Moduli ◽  
Heart Diseases ◽  
Axial Direction ◽  
Circumferential Direction ◽  
Control Group ◽  
Aortic Tissue ◽  
Tension Tests

Aortic allografts have been widely used in treatments of congenital heart diseases with satisfactory clinical outcomes. They were usually cryopreserved and stored for surgical use. The objective of this work was to investigate the effect of cold storage on mechanical properties of aorta, since the compliance mismatch was one important factor associated with the complication after graft surgery. The segments of porcine descending aorta were divided into two groups: the fresh samples which were tested within 24 hours after harvesting served as control group, and frozen samples which were stored in −20°C for 7 days and then thawed. The uniaxial tension tests along circumferential direction and indentation tests were conducted. The average incremental elastic moduli within each stretch range were obtained from the experimental data obtained during tension tests, and the elastic moduli were also calculated by fitting the force-indentation depth data to Hertz model when the tissue was stretched at 1.0, 1.2, 1.4 and 1.6. In addition, the average incremental elastic moduli of both fresh and frozen aortic tissue along axial direction were also obtained by using uniaxial tension tests. The comparison showed that cold storage definitely increased the average incremental elastic modulus of the aortic tissue along circumferential direction; however, the difference is not significant for the elastic moduli along axial direction.

Incorporate Research on Scratching and Uniaxial Tension of Three-Dimensional Microconstruction Simulation Based on Molecular Dynamic

2007 ◽  
Author(s):  
Yingchun Liang ◽  
Jiaxuan Chen ◽  
Qingshun Bai ◽  
Yulan Tang ◽  
Mingjun Chen
Keyword(s):  
Uniaxial Tension ◽  
Diamond Tool ◽  
Three Dimensional ◽  
Strain Curve ◽  
Uniaxial Tensile ◽  
Stress Strain Curve ◽  
Uniaxial Load ◽  
Residual Defect ◽  
Simulation Based ◽  
Pile Up

A method of incorporating research is proposed on scratching and uniaxial tension based on molecular dynamics (MD) with embodied atom method (EAM) for single copper in this paper. The process of tri-pyramid diamond tool scratching the single copper on the (010) plane is simulated under different penetrated depths. The details of scratching process and uniaxial tension are depicted in atomic view. The phenomena of heal-up surface, dislocations and burr are shown after the workpiece is scratched and the principle of that is attempted to analyze. The defects of the surface and subsurface of the workpiece scratched are represented and analyzed by the perspective of dislocations and radial distribution function (RDF). Whereafter the uniaxial tensile simulation of the “real” workpiece after scratching is performed. The mechanism of deformation and the details of change under the uniaxial load are analysed through the stress-strain curve that is combined with the perspective of atom. From simulations results, it is found that the dislocations only occur on the surface and subsurface of workpiece at the small scratching depth, while the dislocations are nucleated and emitted in front of tool and beneath the tool under the deep scratching depth. Dislocations disappear when they propagate to the surface. After the tool escapes the workpiece, the atoms on surface of the workpiece scratched heal up to some extent by the inter force of atoms, while some of the pile-up atoms on surface of tool are attracted backwards surface of workpiece, then form the burr, and others of those atoms are absorbed on the tool’s surface. The number of defects from surface and inner of workpiece increase when the scratching depth is doubled. The order of crystal decreases, especially long range order. It is shown that the penetration depth into the workpiece during scratching affects both surface pile-up and residual defect generation that is important in assessing the change of material properties after being scratched. In the process of the simulation of uniaxial load, the yield stress decrease with the increasing depth of cutting, and dislocations are nucleated at the bottom of groove, especially at the position where the tool escaped nearby burr firstly, and dislocations at ∼45° are observed. It shows that groove is the source of the dislocations aroused. The break-up point is near to the middle of workpiece with increasing depth with groove.

scholarly journals Cavitation damage of epoxy resin subjected to uniaxial tensile loading

2018 ◽  
Vol 5 (1) ◽  
pp. 17-00151-17-00151 ◽  
Author(s):  
Masaharu HIBI ◽  
Farid TRIAWAN ◽  
Kazuaki INABA ◽  
Kosuke TAKAHASHI ◽  
Kikuo KISHIMOTO ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Tensile Loading ◽  
Uniaxial Tensile ◽  
Cavitation Damage ◽  
Uniaxial Tensile Loading
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