Numerical Investigation of the Fracture Properties of Pre-Cracked Monocrystalline/Polycrystalline Graphene Sheets

The fracture properties of pre-cracked monocrystalline/polycrystalline graphene were investigated via a finite element method based on molecular structure mechanics, and the mode I critical stress intensity factor (SIF) was calculated by the Griffith criterion in classical fracture mechanics. For mo...

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Published inMaterials Vol. 12; no. 2; p. 263
Main Authors Li, Xinliang, Guo, Jiangang
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 15.01.2019
MDPI
Subjects
Bond strength
Chemical vapor deposition
Defects
Energy
Fracture toughness
grain boundary
Graphene
Heat treating
Mechanical properties
Mechanics
Molecular structure
molecular structure mechanics
polycrystalline graphene
Polycrystals
Researchers
strain energy per unit area
Stress concentration
Theory
Timoshenko beams
strain energy per unit area
fracture toughness
polycrystalline graphene
grain boundary
molecular structure mechanics
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Abstract The fracture properties of pre-cracked monocrystalline/polycrystalline graphene were investigated via a finite element method based on molecular structure mechanics, and the mode I critical stress intensity factor (SIF) was calculated by the Griffith criterion in classical fracture mechanics. For monocrystalline graphene, the size effects of mode I fracture toughness and the influence of crack width on the mode I fracture toughness were investigated. Moreover, it was found that the ratio of crack length to graphene width has a significant influence on the mode I fracture toughness. For polycrystalline graphene, the strain energy per unit area at different positions was calculated, and the initial fracture site (near grain boundary) was deduced from the variation tendency of the strain energy per unit area. In addition, the effects of misorientation angle of the grain boundary (GB) and the distance between the crack tip and GB on mode I fracture toughness were also analyzed. It was found that the mode I fracture toughness increases with increasing misorientation angle. As the distance between the crack tip and GB increases, the mode I fracture toughness first decreases and then tends to stabilize.
AbstractList The fracture properties of pre-cracked monocrystalline/polycrystalline graphene were investigated via a finite element method based on molecular structure mechanics, and the mode I critical stress intensity factor (SIF) was calculated by the Griffith criterion in classical fracture mechanics. For monocrystalline graphene, the size effects of mode I fracture toughness and the influence of crack width on the mode I fracture toughness were investigated. Moreover, it was found that the ratio of crack length to graphene width has a significant influence on the mode I fracture toughness. For polycrystalline graphene, the strain energy per unit area at different positions was calculated, and the initial fracture site (near grain boundary) was deduced from the variation tendency of the strain energy per unit area. In addition, the effects of misorientation angle of the grain boundary (GB) and the distance between the crack tip and GB on mode I fracture toughness were also analyzed. It was found that the mode I fracture toughness increases with increasing misorientation angle. As the distance between the crack tip and GB increases, the mode I fracture toughness first decreases and then tends to stabilize.
Many researchers have reported that GBs introduced by the CVD technique have an impact on the fracture properties of graphene [9,10,11,12,13,14,15]. [...]it is very meaningful to study the influence of GBs on the fracture mechanical properties of graphene. Besides studying the strength of graphene, many works have studied the initial fracture site of polycrystalline graphene. [...]the fracture toughness is more important than the failure strength. According to the parameters in Table 1, the Timoshenko beams (beam188 element in ANSYS 12.0) should be adopted for this research.
Author Li, Xinliang
Guo, Jiangang
AuthorAffiliation Tianjin Key Laboratory of Modern Engineering Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China; lixl@tju.edu.cn (X.L.)
AuthorAffiliation_xml – name: Tianjin Key Laboratory of Modern Engineering Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China; lixl@tju.edu.cn (X.L.)
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  fullname: Li, Xinliang
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/30650573$$D View this record in MEDLINE/PubMed
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Keywords strain energy per unit area
fracture toughness
polycrystalline graphene
grain boundary
molecular structure mechanics
Language English
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Snippet The fracture properties of pre-cracked monocrystalline/polycrystalline graphene were investigated via a finite element method based on molecular structure...
Many researchers have reported that GBs introduced by the CVD technique have an impact on the fracture properties of graphene [9,10,11,12,13,14,15]. [...]it is...
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StartPage 263
SubjectTerms Bond strength
Chemical vapor deposition
Defects
Energy
Fracture toughness
grain boundary
Graphene
Heat treating
Mechanical properties
Mechanics
Molecular structure
molecular structure mechanics
polycrystalline graphene
Polycrystals
Researchers
strain energy per unit area
Stress concentration
Theory
Timoshenko beams
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Title Numerical Investigation of the Fracture Properties of Pre-Cracked Monocrystalline/Polycrystalline Graphene Sheets
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