Effects of water on the mechanical properties of silica glass using molecular dynamics

Hai Mei, Yongjian Yang, Adri C.T. van Duin, Susan B. Sinnott, John C. Mauro, Lisheng Liu, Zhengyi Fu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Understanding the effects of water on the mechanical properties of silica glass is important for many applications of silicate glasses. In this study, the effects of water on both elastic and plastic properties of pure silica glass are investigated. The introduction of molecular water leads to an increase of Young's modulus of silica glass at low water content, while hydroxyl exhibits an opposite effect. While hydroxyl groups decrease both strength and fracture toughness of the glass via destructing the silica network connectivity, molecular water undermines these properties by effectively driving the silica network to a “strained” configuration in absence of external stress. The water effect can be characterized in terms of the change of Si-O bond length and Si-O-Si bond angle. The plateau in the stress-strain curves of silica with the existence of molecular water in compact tension is associated with the Si-O bond breaking followed by formation of silanol groups. Moreover, the introduction of molecular water lowers the critical tensile stress where the plateau occurs.

Original languageEnglish (US)
Pages (from-to)36-44
Number of pages9
JournalActa Materialia
Volume178
DOIs
StatePublished - Oct 1 2019

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Fused silica
Molecular dynamics
Mechanical properties
Water
Silicon Dioxide
Silica
Hydroxyl Radical
Silicates
Glass
Bond length
Stress-strain curves
Tensile stress
Water content
Fracture toughness
Elastic moduli
Plastics

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

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title = "Effects of water on the mechanical properties of silica glass using molecular dynamics",
abstract = "Understanding the effects of water on the mechanical properties of silica glass is important for many applications of silicate glasses. In this study, the effects of water on both elastic and plastic properties of pure silica glass are investigated. The introduction of molecular water leads to an increase of Young's modulus of silica glass at low water content, while hydroxyl exhibits an opposite effect. While hydroxyl groups decrease both strength and fracture toughness of the glass via destructing the silica network connectivity, molecular water undermines these properties by effectively driving the silica network to a “strained” configuration in absence of external stress. The water effect can be characterized in terms of the change of Si-O bond length and Si-O-Si bond angle. The plateau in the stress-strain curves of silica with the existence of molecular water in compact tension is associated with the Si-O bond breaking followed by formation of silanol groups. Moreover, the introduction of molecular water lowers the critical tensile stress where the plateau occurs.",
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Effects of water on the mechanical properties of silica glass using molecular dynamics. / Mei, Hai; Yang, Yongjian; van Duin, Adri C.T.; Sinnott, Susan B.; Mauro, John C.; Liu, Lisheng; Fu, Zhengyi.

In: Acta Materialia, Vol. 178, 01.10.2019, p. 36-44.

Research output: Contribution to journalArticle

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AU - Mei, Hai

AU - Yang, Yongjian

AU - van Duin, Adri C.T.

AU - Sinnott, Susan B.

AU - Mauro, John C.

AU - Liu, Lisheng

AU - Fu, Zhengyi

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AB - Understanding the effects of water on the mechanical properties of silica glass is important for many applications of silicate glasses. In this study, the effects of water on both elastic and plastic properties of pure silica glass are investigated. The introduction of molecular water leads to an increase of Young's modulus of silica glass at low water content, while hydroxyl exhibits an opposite effect. While hydroxyl groups decrease both strength and fracture toughness of the glass via destructing the silica network connectivity, molecular water undermines these properties by effectively driving the silica network to a “strained” configuration in absence of external stress. The water effect can be characterized in terms of the change of Si-O bond length and Si-O-Si bond angle. The plateau in the stress-strain curves of silica with the existence of molecular water in compact tension is associated with the Si-O bond breaking followed by formation of silanol groups. Moreover, the introduction of molecular water lowers the critical tensile stress where the plateau occurs.

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