Mechanical Properties of Water Stabilized Plasma Spray-Formed Alumina-13wt% Titania

1996 ◽  
Author(s):  
S.H. Leigh ◽  
C.C. Berndt ◽  
S. Sampath ◽  
H. Herman
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Plasma Spray ◽  
Young's Modulus ◽  
Bend Test ◽  
Modulus Of Rupture ◽  
Water Stabilized Plasma ◽  
Point Bend Test ◽  
Point Bend ◽  
Four Point Bend Test

Abstract Mechanical properties of water stabilized plasma spray-formed Al2O3-13wt%TiO2 have been investigated by using indentation techniques and a four-point bend test. Young's modulus was determined by four point bend, nano- and Knoop indentation tests. Modulus of rupture was measured by the four-point bend test. The anisotropic behavior as well as the reduced Young's modulus and strength of thermal spray deposits are extensively investigated and can be related to the unique microstructure; i.e., the spheroidal shape of pores, cracks and splats as well as inter-lamellar boundaries. The heat treatment substantially enhanced the mechanical properties and the microstructure becomes more homogeneous and isotropic; that is, the deposits lose their unique nature and become more similar to bulk materials.

Effect of Powder Types on Mechanical Properties of D-Gun Coatings

1997 ◽  
Author(s):  
M.C. Kim ◽  
S.B. Kim ◽  
J.W. Hong
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Fracture Strain ◽  
Modulus Of Rupture ◽  
Special Device ◽  
High Fracture ◽  
Spray Coatings ◽  
Bend Tests ◽  
Point Bend ◽  
Four Point Bend Test

Abstract Mechanical properties of WC-Co D-Gun coatings produced from various powders were determined by using a four-point bend test equipped with a special device for strain measurements. The MOR(Modulus of Rupture), elastic modulus, fracture strain and toughness were measured from stress-strain curves using the four-point bend tests. The fracture strength values were increased in the order of clad, sintered, agglomerated(no densification), blended and cast & crushed powder coatings. The Co content blended with WC-Co cermet powders significantly increased fracture strain values and decreased elastic modulus values. It was found that the type of powder more significantly influenced the mechanical properties of D-Gun coatings than the composition of powders. The toughness of thermal spray coatings was increased by using WC-Co powders (high MOR) blended with self-fluxing alloy powders (high fracture strain).

Finite Element Method for Predicting the Cohesive Strength of DLC Film on 316L Stainless Steel by Four Point Bend Test and Validation with Experimental Results

2011 ◽  
Vol 264-265 ◽  
pp. 1823-1831
Author(s):  
Muhammad M. Morshed ◽  
Stephen M. Daniels ◽  
M.S.J. Hashmi
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Young’S Modulus ◽  
316L Stainless Steel ◽  
Mechanical Performance ◽  
Young's Modulus ◽  
Cohesive Strength ◽  
Bend Test ◽  
Deposition Pressure ◽  
Point Bend

The mechanical performance of DLC coatings on 316L stainless steel deposited by a saddle field fast atom beam source has been evaluated using the four point bend (FPB) test. Two different deposition parameters, pressure and current were varied when depositing the films. Load-displacement measurements were carried out during the bend test to determine the load corresponding to crack initiation. This load designated as the cohesive strength of the coating which is also called the cracking resistance of coating and provides a measure of the strength of the coating. The cohesive strength of the coating was calculated based on elementary beam theory. Scanning Electron Microscopy (SEM) was used to determine the location of the crack. Finite element analysis was used to predict the stress distribution across the coating thickness. The experimental work on FPB tests has been used to support the numerical (finite element) model for the determination and prediction of film cohesive strength. It was observed that at lower deposition current, the cohesive strength increases with increased deposition pressure whereas, for higher deposition current, these values do not increase with increasing deposition pressure. The model takes into account the film’s Young’s modulus, thickness and deposition pressure and current, and has shown that it is capable of predicting film cohesive strength when combined with a theoretical formulation for brittle fracture. It has been observed that the maximum stress develops at the outer surface of the film and propagates through the film-substrate interface. This result has only been validated for films with higher Young’s modulus compared to that of the substrate material.

The Strength of the Silicon Die in Flip-Chip Assemblies

2003 ◽  
Vol 125 (1) ◽  
pp. 114-119 ◽  
Author(s):  
B. Cotterell ◽  
Z. Chen ◽  
J.-B. Han ◽  
N.-X. Tan
Keyword(s):  
Flip Chip ◽  
Surface Defects ◽  
Bend Test ◽  
Ring Test ◽  
Mechanical Reliability ◽  
Reliability Estimate ◽  
Edge Defects ◽  
Point Bend Test ◽  
Point Bend ◽  
Four Point Bend Test

The mechanical reliability of silicon dies is affected by the defects introduced by surface grinding and edge dicing. The ring-on-ring and the four-point-bend test have been used in this study to separate the distribution in strength for these two types of defect. At low probabilities of failure, it is the “strength” of the edge defects that dominate the reliability. However, if the edges of the die are only lightly stressed compared with the surface, edge defects are unlikely to cause fracture. In this case the use of the four-point-bend test, which is sensitive to both edge and surface defects, will result in an underestimate of the reliability and if only one test is to be performed the ring-on-ring test is preferable to the four-point-bend test. Generally, for a full reliability estimate, the distributions of both types of defect need to be determined.

Experimental study of WL-CSP reliability subjected to a four-point bend-test

2010 ◽  
Vol 50 (7) ◽  
pp. 1007-1013 ◽  
Author(s):  
Cédric Le Coq ◽  
Adellah Tougui ◽  
Marie-Pascale Stempin ◽  
Laurent Barreau
Keyword(s):  
Experimental Study ◽  
Bend Test ◽  
Point Bend Test ◽  
Point Bend ◽  
Four Point Bend Test
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