Initiation and propagation of stage-I cracks in copper single crystals under load control

Mohammad Ahsan Jameel; Pedro Peralta; Campbell Laird

doi:10.1016/S0921-5093(02)00321-0

Initiation and propagation of stage-I cracks in copper single crystals under load control

Mohammad Ahsan Jameel, Pedro Peralta, Campbell Laird

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The initiation and propagation of stage-I cracks determine the magnitude of the life in copper single crystals as the transition to stage-II behavior heralds the advent of fracture. The behavior of initiation and propagation of stage-I cracks under strain control is well understood. However, the PSB behavior and consequently the behavior of the stage-I cracks under load control is significantly different and requires an understanding before a unified methodology for predicting fatigue lives of copper single crystals based on the physics of the kinetics of stage-I crack growth can be developed. Stage-I cracks are found to nucleate in PSBs under load control. However, unlike in strain control, these cracks are almost exclusively found in micro PSBs. The cracks then grow along the PSBs with the occasional crack "skipping" on a secondary slip system to an adjacent PSB. These cracks also show a tendency, similar to that in strain control, to "rob" adjacent PSBs of strain and halt the growth of cracks in those PSBs. The extent of this "strain robbing" region under load control is not known. The growth kinetics of the population of the cracks can be modeled as a function of the cumulative strain and leads to a Coffin Manson equation for predicting the fatigue life. It is seen that this Coffin Manson equation provides a lower bound for the fatigue life of the copper single crystals.

Original language	English (US)
Pages (from-to)	279-286
Number of pages	8
Journal	Materials Science and Engineering A
Volume	342
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(02)00321-0
State	Published - Feb 15 2003
Externally published	Yes

Keywords

Copper
Crystals
Load-control
PSBs
Single
Stage-I

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Initiation and propagation of stage-I cracks in copper single crystals under load control",

abstract = "The initiation and propagation of stage-I cracks determine the magnitude of the life in copper single crystals as the transition to stage-II behavior heralds the advent of fracture. The behavior of initiation and propagation of stage-I cracks under strain control is well understood. However, the PSB behavior and consequently the behavior of the stage-I cracks under load control is significantly different and requires an understanding before a unified methodology for predicting fatigue lives of copper single crystals based on the physics of the kinetics of stage-I crack growth can be developed. Stage-I cracks are found to nucleate in PSBs under load control. However, unlike in strain control, these cracks are almost exclusively found in micro PSBs. The cracks then grow along the PSBs with the occasional crack {"}skipping{"} on a secondary slip system to an adjacent PSB. These cracks also show a tendency, similar to that in strain control, to {"}rob{"} adjacent PSBs of strain and halt the growth of cracks in those PSBs. The extent of this {"}strain robbing{"} region under load control is not known. The growth kinetics of the population of the cracks can be modeled as a function of the cumulative strain and leads to a Coffin Manson equation for predicting the fatigue life. It is seen that this Coffin Manson equation provides a lower bound for the fatigue life of the copper single crystals.",

keywords = "Copper, Crystals, Load-control, PSBs, Single, Stage-I",

author = "Jameel, {Mohammad Ahsan} and Pedro Peralta and Campbell Laird",

note = "Funding Information: We are grateful to the Laboratory for Research on the Structure of Matter at the University of Pennsylvania which provided support for this investigation from National Science Foundation funding, as well as to the University itself. The authors are especially grateful for the support provided by Alex Radin, Rollin Lakis and Bill Romanow.",

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doi = "10.1016/S0921-5093(02)00321-0",

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AU - Jameel, Mohammad Ahsan

AU - Peralta, Pedro

AU - Laird, Campbell

N1 - Funding Information: We are grateful to the Laboratory for Research on the Structure of Matter at the University of Pennsylvania which provided support for this investigation from National Science Foundation funding, as well as to the University itself. The authors are especially grateful for the support provided by Alex Radin, Rollin Lakis and Bill Romanow.

PY - 2003/2/15

Y1 - 2003/2/15

N2 - The initiation and propagation of stage-I cracks determine the magnitude of the life in copper single crystals as the transition to stage-II behavior heralds the advent of fracture. The behavior of initiation and propagation of stage-I cracks under strain control is well understood. However, the PSB behavior and consequently the behavior of the stage-I cracks under load control is significantly different and requires an understanding before a unified methodology for predicting fatigue lives of copper single crystals based on the physics of the kinetics of stage-I crack growth can be developed. Stage-I cracks are found to nucleate in PSBs under load control. However, unlike in strain control, these cracks are almost exclusively found in micro PSBs. The cracks then grow along the PSBs with the occasional crack "skipping" on a secondary slip system to an adjacent PSB. These cracks also show a tendency, similar to that in strain control, to "rob" adjacent PSBs of strain and halt the growth of cracks in those PSBs. The extent of this "strain robbing" region under load control is not known. The growth kinetics of the population of the cracks can be modeled as a function of the cumulative strain and leads to a Coffin Manson equation for predicting the fatigue life. It is seen that this Coffin Manson equation provides a lower bound for the fatigue life of the copper single crystals.

AB - The initiation and propagation of stage-I cracks determine the magnitude of the life in copper single crystals as the transition to stage-II behavior heralds the advent of fracture. The behavior of initiation and propagation of stage-I cracks under strain control is well understood. However, the PSB behavior and consequently the behavior of the stage-I cracks under load control is significantly different and requires an understanding before a unified methodology for predicting fatigue lives of copper single crystals based on the physics of the kinetics of stage-I crack growth can be developed. Stage-I cracks are found to nucleate in PSBs under load control. However, unlike in strain control, these cracks are almost exclusively found in micro PSBs. The cracks then grow along the PSBs with the occasional crack "skipping" on a secondary slip system to an adjacent PSB. These cracks also show a tendency, similar to that in strain control, to "rob" adjacent PSBs of strain and halt the growth of cracks in those PSBs. The extent of this "strain robbing" region under load control is not known. The growth kinetics of the population of the cracks can be modeled as a function of the cumulative strain and leads to a Coffin Manson equation for predicting the fatigue life. It is seen that this Coffin Manson equation provides a lower bound for the fatigue life of the copper single crystals.

KW - Copper

KW - Crystals

KW - Load-control

KW - PSBs

KW - Single

KW - Stage-I

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ER -

Initiation and propagation of stage-I cracks in copper single crystals under load control

Abstract

Keywords

ASJC Scopus subject areas

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