FEM Analysis and Experimental Study for Bond Strength of High-Strength Coating by Wedged Load Test Method

2010 ◽  
Vol 152-153 ◽  
pp. 1058-1061
Author(s):  
Zhou Wei ◽  
Xiao Xia Zhang
Keyword(s):  
Bond Strength ◽  
Adhesion Strength ◽  
Fem Analysis ◽  
High Strength ◽  
Pressure Head ◽  
Optical Microscope ◽  
Complex Stress ◽  
Complex Stress State ◽  
Load Test ◽  
Test Method

A wedged load test method is used to evaluate the adhesion strength of high-strength coatings, which have been processed with various sintering parameters. In this test, for stress concentration at cut tip, cracks are always induced and expanded rapidly cross the interface between coating and substrate. Macro-fracture and SEM image of coating interface of high-strength coating are characterized using optical microscope and scanning electron microscopy (SEM), respectively. In order to evaluate the bonding properties between coating and substrate effectively, corresponding finite element (FE) analysis has been conducted to evaluate the adhesion strength of high-strength coating. And stress distributions cross the interface of high-strength coating are obtained. The stress analysis can help to evaluate the bond strength of high-strength coating. Because of small specimen and contact relationship between wedged pressure head and wedged cuts, complex stress state is affected by many factors resulting from interface, and also by the thickness of coating.

Bond Strength Characteristic of Concrete Patch Repair Material Made from Unsaturated Polyester Resin (UPR)-Mortar

2015 ◽  
Vol 754-755 ◽  
pp. 442-446 ◽  
Author(s):  
Stefanus Adi Kristiawan ◽  
Ageng Bekti Prakoso
Keyword(s):  
Bond Strength ◽  
Strength Characteristic ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
High Strength ◽  
Unsaturated Polyester Resin ◽  
Test Method ◽  
Patch Repair ◽  
Repair Materials ◽  
Bond Plane

Patch repair materials made from unsaturated polyester resin (UPR)-mortar have been investigated to determine their bond strength characteristic by slant shear test method. The relative mechanical properties of UPR-mortar and substrate concrete for composing the specimens are: lower modular and high strength ratio. The experimental results show that the combination of materials causes the observed bond strength are dictated by failure of substrate concrete. The actual bond strength could be higher as most of the specimens fail without separation of the UPR-mortar and substrate concrete at the bond plane.

Laboratory Research on Reservoir Adaption of Water Fracturing

2013 ◽  
Vol 295-298 ◽  
pp. 2816-2819
Author(s):  
Shi Bin Li ◽  
Zhi Chao Kang ◽  
Li Gang Zhang
Keyword(s):  
Fracture Surface ◽  
Screening Method ◽  
Complex Stress ◽  
Complex Stress State ◽  
Test Method ◽  
Laboratory Research ◽  
Low Permeability ◽  
Fracture Surface Roughness ◽  
Fracture Deformation ◽  
Low Permeability Reservoirs

Water fracturing is vast applied in low permeability oil-gas filed, and gains extremely economic benefit. But not all low permeability reservoirs are suitable for water fracturing. This paper analyzed the fracture deformation characteristics and closed form in complex stress state, the fracture surface roughness and shear-slip caused the fracture surface couldn’t be completely meshed, there was residual space. Based on the characteristics, the self-support fracture combination and conductivity test method were established. The non-dimensional conductivity as the evaluation index, the water fracturing reservoir screening method was established.

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