Micromechanical modeling of short crack nucleation and growth in high cycle fatigue of martensitic microstructures

Matti Lindroos, Anssi Laukkanen (Corresponding Author), Tom Andersson, Joona Vaara, Antti Mäntylä, Tero Frondelius

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

High cycle fatigue (HCF) is a frequently limiting failure mechanism of machine elements and modern high strength steels. Present day design rules rely on semi-empirical methods, guidelines and utilization of macroscopic analysis means in origin, such as fracture mechanics. The resulting challenge is that short crack regime, critical for HCF in terms of lifetime of components and products, is somewhat poorly handled. This is an outcome of the fact that the present means and methodologies do not explicitly account for effects arising from material microstructure, an oversight micromechanics aims to rectify. Micromechanical modeling operating on fatigue at the scale of material microstructure necessitates the introduction of suitable means to describe the mechanisms of cyclic plastic deformation and microstructural morphologies, considered critical for HCF especially at the early stages of micro-crack nucleation and damage evolution towards and within the short crack regime. In current work, a crystal plasticity based approach with combined hardening is utilized to capture the respective deformation response utilizing full field modeling. The modeling is carried out for both simplified prior austenite grain like microstructures as well as complex imaging based martensitic quenched and tempered steel microstructural models. A fully coupled damage modeling scheme is introduced to track damage nucleation and evolution at the scale of the studied microstructures. Crack closure is included within the approach to track behavior of microstructure scale defects under, e.g., fully reversed loading, more realistically. Model calibration is addressed and application cases involving damage and crack growth both under monotonic and cyclic loading are presented. The results demonstrate how the coupling of damage to crystal plasticity modeling can be utilized to identify and track the evolution of microstructure scale damage mechanisms in complex martensitic microstructures. Interactions between strain localization and damage accumulation are presented as well as transition from micro-cracking to short crack growth. The results show that the proposed approach can interpret the intricate dependencies and relations between complex microstructures, their (cyclic) deformation mechanisms and evolution of damage, the outcomes regarding crack formation and behavior are found to be in line with similar experimental studies. The proposed framework for modeling damage in polycrystalline microstructures is quite general in its capabilities. By solely introducing a suitable crystal plasticity based deformation model and a damage model describing nucleation and softening can plastic slip and damage interactions be studied in complex microstructures, and in principle, on any system where similar constitutive models are utilizable. The exploitation of the resulting micromechanical modeling and simulation capabilities lies both in simulation driven design of fatigue resistant components and high strength steels.

Original languageEnglish
Article number109185
Number of pages13
JournalComputational Materials Science
Volume170
DOIs
Publication statusPublished - Dec 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

short cracks
High Cycle Fatigue
Nucleation
Microstructure
Crack
Damage
nucleation
Fatigue of materials
damage
Cracks
microstructure
cycles
Modeling
Crystal Plasticity
Plasticity
plastic properties
High Strength Steel
Crack Growth
high strength steels
High strength steel

Keywords

  • Crystal plasticity
  • High cycle fatigue
  • High strength steel
  • Micromechanics

Cite this

@article{a7cf54f80647440bbda2a4eba4efdf27,
title = "Micromechanical modeling of short crack nucleation and growth in high cycle fatigue of martensitic microstructures",
abstract = "High cycle fatigue (HCF) is a frequently limiting failure mechanism of machine elements and modern high strength steels. Present day design rules rely on semi-empirical methods, guidelines and utilization of macroscopic analysis means in origin, such as fracture mechanics. The resulting challenge is that short crack regime, critical for HCF in terms of lifetime of components and products, is somewhat poorly handled. This is an outcome of the fact that the present means and methodologies do not explicitly account for effects arising from material microstructure, an oversight micromechanics aims to rectify. Micromechanical modeling operating on fatigue at the scale of material microstructure necessitates the introduction of suitable means to describe the mechanisms of cyclic plastic deformation and microstructural morphologies, considered critical for HCF especially at the early stages of micro-crack nucleation and damage evolution towards and within the short crack regime. In current work, a crystal plasticity based approach with combined hardening is utilized to capture the respective deformation response utilizing full field modeling. The modeling is carried out for both simplified prior austenite grain like microstructures as well as complex imaging based martensitic quenched and tempered steel microstructural models. A fully coupled damage modeling scheme is introduced to track damage nucleation and evolution at the scale of the studied microstructures. Crack closure is included within the approach to track behavior of microstructure scale defects under, e.g., fully reversed loading, more realistically. Model calibration is addressed and application cases involving damage and crack growth both under monotonic and cyclic loading are presented. The results demonstrate how the coupling of damage to crystal plasticity modeling can be utilized to identify and track the evolution of microstructure scale damage mechanisms in complex martensitic microstructures. Interactions between strain localization and damage accumulation are presented as well as transition from micro-cracking to short crack growth. The results show that the proposed approach can interpret the intricate dependencies and relations between complex microstructures, their (cyclic) deformation mechanisms and evolution of damage, the outcomes regarding crack formation and behavior are found to be in line with similar experimental studies. The proposed framework for modeling damage in polycrystalline microstructures is quite general in its capabilities. By solely introducing a suitable crystal plasticity based deformation model and a damage model describing nucleation and softening can plastic slip and damage interactions be studied in complex microstructures, and in principle, on any system where similar constitutive models are utilizable. The exploitation of the resulting micromechanical modeling and simulation capabilities lies both in simulation driven design of fatigue resistant components and high strength steels.",
keywords = "Crystal plasticity, High cycle fatigue, High strength steel, Micromechanics",
author = "Matti Lindroos and Anssi Laukkanen and Tom Andersson and Joona Vaara and Antti M{\"a}ntyl{\"a} and Tero Frondelius",
year = "2019",
month = "12",
doi = "10.1016/j.commatsci.2019.109185",
language = "English",
volume = "170",
journal = "Computational Materials Science",
issn = "0927-0256",
publisher = "Elsevier",

}

Micromechanical modeling of short crack nucleation and growth in high cycle fatigue of martensitic microstructures. / Lindroos, Matti; Laukkanen, Anssi (Corresponding Author); Andersson, Tom; Vaara, Joona; Mäntylä, Antti; Frondelius, Tero.

In: Computational Materials Science, Vol. 170, 109185, 12.2019.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Micromechanical modeling of short crack nucleation and growth in high cycle fatigue of martensitic microstructures

AU - Lindroos, Matti

AU - Laukkanen, Anssi

AU - Andersson, Tom

AU - Vaara, Joona

AU - Mäntylä, Antti

AU - Frondelius, Tero

PY - 2019/12

Y1 - 2019/12

N2 - High cycle fatigue (HCF) is a frequently limiting failure mechanism of machine elements and modern high strength steels. Present day design rules rely on semi-empirical methods, guidelines and utilization of macroscopic analysis means in origin, such as fracture mechanics. The resulting challenge is that short crack regime, critical for HCF in terms of lifetime of components and products, is somewhat poorly handled. This is an outcome of the fact that the present means and methodologies do not explicitly account for effects arising from material microstructure, an oversight micromechanics aims to rectify. Micromechanical modeling operating on fatigue at the scale of material microstructure necessitates the introduction of suitable means to describe the mechanisms of cyclic plastic deformation and microstructural morphologies, considered critical for HCF especially at the early stages of micro-crack nucleation and damage evolution towards and within the short crack regime. In current work, a crystal plasticity based approach with combined hardening is utilized to capture the respective deformation response utilizing full field modeling. The modeling is carried out for both simplified prior austenite grain like microstructures as well as complex imaging based martensitic quenched and tempered steel microstructural models. A fully coupled damage modeling scheme is introduced to track damage nucleation and evolution at the scale of the studied microstructures. Crack closure is included within the approach to track behavior of microstructure scale defects under, e.g., fully reversed loading, more realistically. Model calibration is addressed and application cases involving damage and crack growth both under monotonic and cyclic loading are presented. The results demonstrate how the coupling of damage to crystal plasticity modeling can be utilized to identify and track the evolution of microstructure scale damage mechanisms in complex martensitic microstructures. Interactions between strain localization and damage accumulation are presented as well as transition from micro-cracking to short crack growth. The results show that the proposed approach can interpret the intricate dependencies and relations between complex microstructures, their (cyclic) deformation mechanisms and evolution of damage, the outcomes regarding crack formation and behavior are found to be in line with similar experimental studies. The proposed framework for modeling damage in polycrystalline microstructures is quite general in its capabilities. By solely introducing a suitable crystal plasticity based deformation model and a damage model describing nucleation and softening can plastic slip and damage interactions be studied in complex microstructures, and in principle, on any system where similar constitutive models are utilizable. The exploitation of the resulting micromechanical modeling and simulation capabilities lies both in simulation driven design of fatigue resistant components and high strength steels.

AB - High cycle fatigue (HCF) is a frequently limiting failure mechanism of machine elements and modern high strength steels. Present day design rules rely on semi-empirical methods, guidelines and utilization of macroscopic analysis means in origin, such as fracture mechanics. The resulting challenge is that short crack regime, critical for HCF in terms of lifetime of components and products, is somewhat poorly handled. This is an outcome of the fact that the present means and methodologies do not explicitly account for effects arising from material microstructure, an oversight micromechanics aims to rectify. Micromechanical modeling operating on fatigue at the scale of material microstructure necessitates the introduction of suitable means to describe the mechanisms of cyclic plastic deformation and microstructural morphologies, considered critical for HCF especially at the early stages of micro-crack nucleation and damage evolution towards and within the short crack regime. In current work, a crystal plasticity based approach with combined hardening is utilized to capture the respective deformation response utilizing full field modeling. The modeling is carried out for both simplified prior austenite grain like microstructures as well as complex imaging based martensitic quenched and tempered steel microstructural models. A fully coupled damage modeling scheme is introduced to track damage nucleation and evolution at the scale of the studied microstructures. Crack closure is included within the approach to track behavior of microstructure scale defects under, e.g., fully reversed loading, more realistically. Model calibration is addressed and application cases involving damage and crack growth both under monotonic and cyclic loading are presented. The results demonstrate how the coupling of damage to crystal plasticity modeling can be utilized to identify and track the evolution of microstructure scale damage mechanisms in complex martensitic microstructures. Interactions between strain localization and damage accumulation are presented as well as transition from micro-cracking to short crack growth. The results show that the proposed approach can interpret the intricate dependencies and relations between complex microstructures, their (cyclic) deformation mechanisms and evolution of damage, the outcomes regarding crack formation and behavior are found to be in line with similar experimental studies. The proposed framework for modeling damage in polycrystalline microstructures is quite general in its capabilities. By solely introducing a suitable crystal plasticity based deformation model and a damage model describing nucleation and softening can plastic slip and damage interactions be studied in complex microstructures, and in principle, on any system where similar constitutive models are utilizable. The exploitation of the resulting micromechanical modeling and simulation capabilities lies both in simulation driven design of fatigue resistant components and high strength steels.

KW - Crystal plasticity

KW - High cycle fatigue

KW - High strength steel

KW - Micromechanics

UR - http://www.scopus.com/inward/record.url?scp=85070615107&partnerID=8YFLogxK

U2 - 10.1016/j.commatsci.2019.109185

DO - 10.1016/j.commatsci.2019.109185

M3 - Article

AN - SCOPUS:85070615107

VL - 170

JO - Computational Materials Science

JF - Computational Materials Science

SN - 0927-0256

M1 - 109185

ER -