Prediction of discontinuous fatigue crack growth in high density polyethylene based on the crack layer theory with variable crack layer parameters

Jung Wook Wee, Byoung-Ho Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Crack layer (CL) theory has the advantage of capturing the physics of slow crack growth (SCG) and simulating various scenarios of SCG in thermoplastics. However, lack of knowledge regarding the dependency of CL input parameters on loading conditions and time limits the use of CL theory in predicting the lifespan of materials subject to brittle fracture. In this study, CL theory with variable average process zone (PZ) boundary traction (σclose) and characteristic time for PZ degradation (t) is applied to fatigue tests with various loading conditions in order to observe discontinuous SCG. Using simulations, experimental results are achieved by changing two CL parameters, thereby establishing these two parameters as the key factors affecting SCG for various types of applied loads. In addition, the specific relationships between these two parameters and fatigue loading conditions are obtained. These obtained relationships may be beneficial for practical use of CL theory to estimate the SCG processes as well as their lifespan under various fatigue conditions.

Original languageEnglish
Pages (from-to)304-312
Number of pages9
JournalInternational Journal of Fatigue
Volume92
DOIs
Publication statusPublished - 2016 Nov 1

Fingerprint

Fatigue Crack Growth
Polyethylene
High density polyethylenes
Fatigue crack propagation
Crack Growth
Crack
Crack propagation
Cracks
Prediction
Fatigue
Life Span
Fatigue of materials
Two Parameters
Brittle Fracture
Growth Process
Brittle fracture
Thermoplastics
Degradation
Physics
Scenarios

Keywords

  • Crack layer theory
  • Fatigue
  • High density polyethylene
  • Simulation
  • Slow crack growth

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

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title = "Prediction of discontinuous fatigue crack growth in high density polyethylene based on the crack layer theory with variable crack layer parameters",
abstract = "Crack layer (CL) theory has the advantage of capturing the physics of slow crack growth (SCG) and simulating various scenarios of SCG in thermoplastics. However, lack of knowledge regarding the dependency of CL input parameters on loading conditions and time limits the use of CL theory in predicting the lifespan of materials subject to brittle fracture. In this study, CL theory with variable average process zone (PZ) boundary traction (σclose) and characteristic time for PZ degradation (t∗) is applied to fatigue tests with various loading conditions in order to observe discontinuous SCG. Using simulations, experimental results are achieved by changing two CL parameters, thereby establishing these two parameters as the key factors affecting SCG for various types of applied loads. In addition, the specific relationships between these two parameters and fatigue loading conditions are obtained. These obtained relationships may be beneficial for practical use of CL theory to estimate the SCG processes as well as their lifespan under various fatigue conditions.",
keywords = "Crack layer theory, Fatigue, High density polyethylene, Simulation, Slow crack growth",
author = "Wee, {Jung Wook} and Byoung-Ho Choi",
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AU - Wee, Jung Wook

AU - Choi, Byoung-Ho

PY - 2016/11/1

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N2 - Crack layer (CL) theory has the advantage of capturing the physics of slow crack growth (SCG) and simulating various scenarios of SCG in thermoplastics. However, lack of knowledge regarding the dependency of CL input parameters on loading conditions and time limits the use of CL theory in predicting the lifespan of materials subject to brittle fracture. In this study, CL theory with variable average process zone (PZ) boundary traction (σclose) and characteristic time for PZ degradation (t∗) is applied to fatigue tests with various loading conditions in order to observe discontinuous SCG. Using simulations, experimental results are achieved by changing two CL parameters, thereby establishing these two parameters as the key factors affecting SCG for various types of applied loads. In addition, the specific relationships between these two parameters and fatigue loading conditions are obtained. These obtained relationships may be beneficial for practical use of CL theory to estimate the SCG processes as well as their lifespan under various fatigue conditions.

AB - Crack layer (CL) theory has the advantage of capturing the physics of slow crack growth (SCG) and simulating various scenarios of SCG in thermoplastics. However, lack of knowledge regarding the dependency of CL input parameters on loading conditions and time limits the use of CL theory in predicting the lifespan of materials subject to brittle fracture. In this study, CL theory with variable average process zone (PZ) boundary traction (σclose) and characteristic time for PZ degradation (t∗) is applied to fatigue tests with various loading conditions in order to observe discontinuous SCG. Using simulations, experimental results are achieved by changing two CL parameters, thereby establishing these two parameters as the key factors affecting SCG for various types of applied loads. In addition, the specific relationships between these two parameters and fatigue loading conditions are obtained. These obtained relationships may be beneficial for practical use of CL theory to estimate the SCG processes as well as their lifespan under various fatigue conditions.

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