A New Approach for Bimaterial Interface Fracture Toughness Evaluation

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
John Jy-An Wang ◽  
Ian G. Wright ◽  
Michael J. Lance ◽  
Ken C. Liu
Keyword(s):  
Thin Film ◽  
Fracture Toughness ◽  
Lattice Mismatch ◽  
Coefficient Of Thermal Expansion ◽  
Test Method ◽  
Interface Fracture ◽  
Bimaterial Interface ◽  
Material Interfaces ◽  
Coating Materials ◽  
Interface Fracture Toughness

A material configuration of central importance in composite materials or in protective coating technology is a thin film of one material deposited onto a substrate of a different material. Fabrication of such a structure inevitably gives rise to stress in the film due to lattice mismatch, differing coefficient of thermal expansion, chemical reactions, or other physical effects. Therefore, in general, the weakest link in this composite system often resides at the interface between the thin film and the substrate. In order to make multilayered electronic devices and structural composites with long-term reliability, the fracture behavior of the material interfaces must be known. This project offers an innovative testing procedure of using a spiral notch torsion bar method for the determination of interface fracture toughness that is applicable to thin coating materials in general. The feasibility study indicated that this approach for studying thin film interface fracture is repeatable and reliable, and the demonstrated test method closely adheres to and is consistent with classical fracture mechanics theory.

Determination of Interfacial Fracture Toughness for Thin Film Coating Materials

2005 ◽  
Author(s):  
John Jy-An Wang ◽  
Ian G. Wright ◽  
Michael J. Lance ◽  
Ken C. Liu
Keyword(s):  
Thin Film ◽  
Fracture Toughness ◽  
Lattice Mismatch ◽  
Coefficient Of Thermal Expansion ◽  
Testing Procedure ◽  
Interface Fracture ◽  
Material Interfaces ◽  
Coating Materials ◽  
Interface Fracture Toughness

A material configuration of central importance in composite materials or in protective coating technology is a thin film of one material deposited onto a substrate of a different material. Fabrication of such a structure inevitably gives rise to stress in the film due to lattice mismatch, differing coefficient of thermal expansion, chemical reactions, or other physical effects. Therefore, in general, the weakest link in this composite system often resides at the interface between the thin film and substrate. In order to make multi-layered electronic devices and structural composites with long-term reliability, the fracture behavior of the material interfaces must be known. This project is intended to address the problems associated with interface fracture toughness evaluation and offers an innovative testing procedure for the determination of interface fracture toughness applicable to thin coating materials in general.

An Innovative Technique for Bi-Material Interface Toughness Research

2004 ◽  
Author(s):  
John Jy-An Wang ◽  
Ian G. Wright ◽  
Ken C. Liu ◽  
Roy L. Xu
Keyword(s):  
Thin Film ◽  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Coefficient Of Thermal Expansion ◽  
Testing Procedure ◽  
Interface Fracture ◽  
Fracture Toughness Test ◽  
Coating Materials ◽  
Testing Procedures ◽  
Interface Fracture Toughness

A material configuration of central importance in microelectronics, optoelectronics, and thermal barrier coating technology is a thin film of one material deposited onto a substrate of a different material. Fabrication of such a structure inevitably gives rise to stress in the film due to lattice mismatch, differing coefficient of thermal expansion, chemical reactions, or other physical effects. Therefore, in general, the weakest link in this composite system often resides at the interface between the thin film and substrate. In order to make multi-layered electronic devices and structural composites with long-term reliability, the fracture behavior of the material interfaces must be known. Unfortunately, none of the state-of-the-art testing methods for evaluating interface fracture toughness is fully conformed to fracture mechanics theory, as is evident from the severe scatter in the existing data, and the procedure dependence in thin film/coating evaluation methods. This project is intended to address the problems associated with this deficiency and offers an innovative testing procedure for the determination of interface fracture toughness applicable to thin coating materials in general. Phase I of this new approach and the associated bi-material fracture mechanics development proposed for evaluating interface fracture toughness are described herein. The effort includes development of specimen configuration and related instrumentation set-up, testing procedures, and postmortem examination. A spiral notch torsion fracture toughness test (SNTT) system was utilized. The objectives of the testing procedure described are to enable the development of new coating materials by providing a reliable method for use in assessing their performance.

A new approach for evaluating thin film interface fracture toughness

2006 ◽  
Vol 426 (1-2) ◽  
pp. 332-345 ◽  
Author(s):  
Jy-An John Wang ◽  
Ian G. Wright ◽  
Michael J. Lance ◽  
Ken C. Liu
Keyword(s):  
Thin Film ◽  
Fracture Toughness ◽  
Interface Fracture ◽  
New Approach ◽  
Interface Fracture Toughness ◽  
Film Interface

Coating Interface Fracture Toughness Evaluation by a Combination of Edge Compression and Slinging Load

2004 ◽  
Vol 261-263 ◽  
pp. 435-440 ◽  
Author(s):  
Masayuki Arai ◽  
Yoshifumi Okajima ◽  
Kikuo Kishimoto
Keyword(s):  
Fracture Toughness ◽  
Phase Angle ◽  
Complex Stress ◽  
Test Method ◽  
Interface Fracture ◽  
Beam Model ◽  
Fracture Toughness Test ◽  
Barrier Coating ◽  
Interface Fracture Toughness ◽  
Toughness Evaluation

Previous methods to measure interface fracture toughness between coating and substrate can't easily vary a phase angle as a mixed mode parameter. So that, the new coating interface fracture toughness test method, by which phase angle at interface crack tip can be varied due to applying a combination of compression loading to the coating edge and slinging such as beam bending, is proposed. The simple formula, which connects to complex stress intensity factors and double loading is firstly derived on the basis of the cracked beam model proposed by Suo and Hutchinson [1]. As an application of the method and associated formula, thermal barrier coating/super-alloy interface toughness is evaluated based on numerical analysis.

Determination of Interface Fracture Toughness in Thermal Barrier Coating System by Blister Tests

2003 ◽  
Vol 125 (2) ◽  
pp. 176-182 ◽  
Author(s):  
Y. C. Zhou ◽  
T. Hashida ◽  
C. Y. Jian
Keyword(s):  
Fracture Toughness ◽  
Phase Angle ◽  
Main Crack ◽  
Interfacial Crack ◽  
Type A ◽  
Test Method ◽  
Interface Fracture ◽  
Stable Phase ◽  
Type B ◽  
Interface Fracture Toughness

The theoretical model for the blister test method was used to analyze the interface fracture toughness of zirconia coating deposited on an SUS304 stainless steel substrate by a plasma-spraying method. The elastic parameters of the debonded coating were determined by testing the oil pressure q and maximum deflection w(0). SEM observation, compliance method and ultrasonic detection were used to determine the radius of the debonded coating. The three methods gave the same results for the debonded coating radius. Micro-observations showed that the interfacial crack propagates by the growth of voids or microcracks ahead of the main crack and coalescence with the main crack. The energy release rate G0 with phase angle ψ=0 for type A coating and type B coating was, respectively, 14.54∼25.88J/m2 and 11.88∼16.21J/m2. The corresponding interface fracture toughness for type A TBC coating and for type B TBC coating is, respectively, 0.77∼1.02MPas˙m1/2 and 0.52∼0.61MPas˙m1/2. The stable phase angle was approximately −31.5° and −30.2° for coating A and coating B, respectively.

scholarly journals INTERFACE FRACTURE TOUGHNESS ASSESSMENT OF SOLDER JOINTS USING DOUBLE CANTILEVER BEAM TEST

2010 ◽  
Vol 24 (01n02) ◽  
pp. 164-174 ◽  
Author(s):  
SHANE ZHI YUAN LOO ◽  
PUAY CHENG LEE ◽  
ZAN XUAN LIM ◽  
NATALIA YANTARA ◽  
TONG YAN TEE ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Solder Joint ◽  
Energy Release Rate ◽  
Release Rate ◽  
Double Cantilever Beam ◽  
Interface Reaction ◽  
Critical Energy ◽  
Interface Fracture ◽  
Critical Energy Release Rate ◽  
Interface Fracture Toughness

In the current work, a test scheme to evaluate solder joint interface fracture toughness using double cantilever beam (DCB) test has been successfully demonstrated. The obtained results, in terms of critical energy release rate, predict the joint failure based on the principle of fracture mechanics. The results can be used as a materials property in the reliability design of various types of solder-ball joined packages. DCB specimens made of 99.9 wt% copper were selected in the current work. Eutectic Sn -37 Pb and lead-free Sn -3.5 Ag -0.5 Cu solders were used to join two pieces of the copper beams with controlled solder thickness. The test record showed steady propagation of the crack along the solder / copper interface, which verifies the viability of such a testing scheme. Interface fracture toughness for as-joined, extensively-reflowed and thermally aged samples has been measured. Both the reflow treatment and the thermal aging lead to degradation of the solder joint fracture resistance. Reflow treatment was more damaging as it induces much faster interface reaction. Fractographic analysis established that the fracture has a mixed micromechanism of dimple and cleavage. The dimples are formed as a result of the separation between the hard intermetallic compound (IMC) particles and the soft solder material, while the cleavage is formed by the brittle split of the IMCs. When the IMC thickness is increased due to extended interface reaction, the proportion of IMC cleavage failure increases, and this was reflected in the decrease of the critical energy release rate.

The Role of Strength in Determining Composite Material Toughness Using the Interface Indentation Fracture Test

2012 ◽  
Author(s):  
Brian A. Grimm ◽  
John P. Parmigiani
Keyword(s):  
Fracture Toughness ◽  
Cohesive Zone ◽  
Measurement Techniques ◽  
Element Model ◽  
Interface Strength ◽  
Test Method ◽  
Interface Fracture ◽  
Indentation Fracture ◽  
Zone Method ◽  
Brittle Composite

Understanding fracture behavior at the interfaces of brittle composite materials requires appropriate measurement techniques for fracture toughness. Due to their simplicity and convenience, indentation techniques are attractive solutions. One such technique is the interface indentation fracture (IIF) test, which measures the relative toughness of interfaces between brittle materials by introducing a series of indents at various angles of incidence (0–90°) to the interface, from which crack growth will either be by penetration through the interface or by deflection (debonding) along it. Larger angles of incidence promote penetration and smaller angles promote deflection, so by noting the critical angle at which propagation changes from penetration to deflection, the IFF test can make inferences about relative fracture toughness of different interfaces tested under similar conditions. However, as previous work by Parmigiani and Thouless has shown, the penetration vs. deflection behavior of a crack incident to an interface is a function not only of interface fracture toughness but also of interface strength. Interface cohesive zone elements in a finite element model incorporating both fracture toughness and strength criteria were used to study the propagation behavior of cracks normally incident to brittle composite interfaces. In the follow up work presented here, the cohesive zone method (CZM) has been extended to study cracks that occur at varying angles of incidence to these interfaces. Results show that IIF testing does not always result in unique values for relative fracture toughness; when interface strength is varied, it is possible for identical IIF-test critical angles to correspond to differing interface toughness values and, conversely, for differing critical angles to correspond to identical fracture toughness values. To properly employ the IFF test method, this phenomenon must be taken into account.

Microstructure based modeling of friction stir welded joint of dissimilar metals using crystal plasticity

2021 ◽  
pp. 1-29
Author(s):  
Shank Kulkarni ◽  
Timothy Truster ◽  
Hrishikesh Das ◽  
Varun Gupta ◽  
Ayoub Soulami ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Crystal Plasticity ◽  
Mg Alloy ◽  
Interface Fracture ◽  
Zone Model ◽  
Dissimilar Metals ◽  
Friction Stir ◽  
Az31 Mg Alloy ◽  
Interface Fracture Toughness

Abstract The friction stir welding (FSW) process shows promising results in joining dissimilar metals which are otherwise almost impossible to join using traditional welding techniques. Being a new technique, the deformation and the failure mechanism of the joints made by the FSW process needs to be investigated. In this work, a joint between AZ31 Mg alloy and DP590 steel is modeled using phenomenological crystal plasticity formulation on the mesoscale in the form of a representative volume element (RVE). The interface of the two materials is modeled using a cohesive zone model. A parametric study has been performed to understand the effect of grain size and interface fracture toughness as well as strength on the mechanical performance of the joint. It was found that the grain size of AZ31 Mg alloy, as well as DP590 steel, has little effect on the overall joint performance. On the other hand, interface fracture toughness and strength have a significant impact on the mechanical properties of the joint.

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