Peridynamic modeling of elastic bimaterial interface fracture

2022 ◽  
Vol 390 ◽  
pp. 114458
Author(s):  
Heng Zhang ◽  
Xiong Zhang ◽  
Yan Liu ◽  
Pizhong Qiao
Keyword(s):  
Interface Fracture ◽  
Bimaterial Interface

Plasticity Considerations in Probabilistic Ceramic-to-Metal Joint Design

1994 ◽  
Author(s):  
D. A. O’Neil ◽  
J. H. Selverian ◽  
K. S. Kim
Keyword(s):  
Failure Criterion ◽  
Essential Feature ◽  
Interface Fracture ◽  
Bimaterial Interface ◽  
Material Interface ◽  
Joint Design ◽  
Metal Joint ◽  
Brazed Joints ◽  
Energy Dissipated ◽  
Probabilistic Failure Analysis

A new probabilistic failure criterion was developed for the design of high-temperature ceramic-to-metal joints. The essential feature of the theory is the inclusion of the energy dissipated during plastic deformation of the adjacent braze layer in the joint. A large number of bi-material interface fracture simulations were performed for different crack positions and orientations near the bimaterial interface to determine the effect on stresses in the ceramic near the interface. The effective stress values were then ported to a probabilistic failure analysis code, which permitted simple inclusion of the new failure criterion. Brazed joints were made and failure tested in torsion to verify the failure criterion. Results show that the new failure criterion more closely approximates the failure of the ceramic-to-metal joints over the entire range of ultimate loads, an is a significant improvement in the failures criteria previously used for this type of joint design. Aspects of the failure criterion, material systems, residual stresses, mechanical behavior, and strength predictions will be presented.

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.

EXPERIMENTAL INVESTIGATION ON FRACTURE TOUGHNESS OF INTERFACE CRACK FOR ROCK/CONCRETE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6141-6148 ◽  
Author(s):  
SHUICHENG YANG ◽  
LI SONG ◽  
ZHE LI ◽  
SONGMEI HUANG
Keyword(s):  
Fracture Toughness ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Stress Intensity Factors ◽  
Input Parameter ◽  
Interface Fracture ◽  
Bimaterial Interface ◽  
Beam Specimen ◽  
Intensity Factors ◽  
Unit Load

Fracture toughness is a critical input parameter for fracture-mechanics based fitness-for-service assessments, and it is preferable to determine this by experiment. In the present paper, fracture toughness of rock/concrete bimaterial interface was obtained by the tests which were performed on the universal material tester. A beam specimen with single-edge crack is used to form the different fracture mode mixity. The stress intensity factors of specimen per unit load with different combinations of K1 and K2 were calculated by the mixed hybrid finite element method on the principals of linear elastic interface fracture mechanics. By regressing the critical stress intensity factors of 7 specimen groups, two experiential fracture criterions of mixed crack interface were derived, and the fracture toughness([Formula: see text], [Formula: see text]) of rock/concrete were obtained further.

Plasticity Considerations in Probabilistic Ceramic-to-Metal Joint Design

1996 ◽  
Vol 118 (1) ◽  
pp. 159-166
Author(s):  
D. A. ONeil ◽  
J. H. Selverian ◽  
K. S. Kim
Keyword(s):  
Failure Criterion ◽  
Essential Feature ◽  
Interface Fracture ◽  
Bimaterial Interface ◽  
Joint Design ◽  
Material Systems ◽  
Metal Joint ◽  
Brazed Joints ◽  
Energy Dissipated ◽  
Probabilistic Failure Analysis

A new probabilistic failure criterion was developed for the design of high-temperature ceramic-to-metal joints. The essential feature of the theory is the inclusion of the energy dissipated during plastic deformation of the adjacent braze layer in the joint. A large number of bimaterial interface fracture simulations were performed for different crack positions and orientations near the bimaterial interface to determine the effect on stresses in the ceramic near the interface. The effective stress values were then ported to a probabilistic failure analysis code, which permitted simple inclusion of the new failure criterion. Brazed joints were made and failure tested in torsion to verify the failure criterion. Results show that the new failure critertion more closely approximates the failure of the ceramic-to-metal joints over the entire range of ultimate loads, and is a significant improvement in the failures criteria previously used for this type of joint design. Aspects of the failure criterion, material systems, residual stresses, mechanical behavior, and strength predictions will be presented.

Characterization of Plasticity in Bimaterial Interface Fracture by STM

1991 ◽  
Vol 238 ◽  
Author(s):  
Clifford P. Warner ◽  
Dawn A. Bonnell
Keyword(s):  
Scanning Tunneling Microscope ◽  
Interface Fracture ◽  
Scanning Tunneling ◽  
Bimaterial Interface ◽  
Nanometer Scale ◽  
Metal Ceramic ◽  
Mathematical Techniques ◽  
Fracture Features ◽  
Size Scales

ABSTRACTThe Scanning Tunneling Microscope was used as a surface profilometer to image fractured interfaces of a model metal/ceramic system, Au/sapphire. By characterizing the metal side of interface fracture, features related to plastic deformation were quantified. The spatial resolution of STM allowed these measurements to be made down to the nanometer scale. Mathematical techniques were developed to characterize surface features on several size scales and to relate them to the mechanisms from which they were produced.

Micromechanics Measurements Applied to Integrated Circuit Microelectronics

1997 ◽  
Vol 473 ◽  
Author(s):  
David R. Clarke
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
Fracture Resistance ◽  
Interface Fracture ◽  
New Techniques ◽  
Fracture Properties ◽  
Engineered Structures ◽  
Mechanical And Fracture Properties ◽  
Interconnect Lines ◽  
Metallic Interconnect

ABSTRACTAs in other engineered structures, fracture occasionally occurs in integrated microelectronic circuits. Fracture can take a number of forms including voiding of metallic interconnect lines, decohesion of interfaces, and stress-induced microcracking of thin films. The characteristic feature that distinguishes such fracture phenomena from similar behaviors in other engineered structures is the length scales involved, typically micron and sub-micron. This length scale necessitates new techniques for measuring mechanical and fracture properties. In this work, we describe non-contact optical techniques for probing strains and a microscopic “decohesion” test for measuring interface fracture resistance in integrated circuits.

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