B2O3 Base Glasses: B50c

About Property Data Summaries.

Reference: NBS Technical Note 1212

Other materials: Borate Glasses

Material Summary:

Molar composition: 50% B2O3 + 50% PbO

Property Summary:

Property                           Value  Environment  Notes
---------------------------------  -----  -----------  --------------------------------------
Crack Growth Exponent []   .......: 
Elastic Modulus [GPa]   ..........: 31.5   Air          Young's modulus is extrapolated. 
Fracture Energy [J/m2]  ..........:  2.29  Air          Notched beam
Fracture Toughness [MPa m1/2].....:  0.38  Air          Notched beam 

Crack Growth Exponent []   .......:
Elastic Modulus [GPa]   ..........: 61.2   N2 liquid       
Fracture Energy [J/m2]  ..........:  2.13  N2 liquid  Controlled flaw 
Fracture Toughness [MPa m1/2].....:  0.51  N2 liquid  Controlled flaw 

Crack Growth Exponent []   .......:           
Elastic Modulus [GPa]   ..........: 61.2   Air                             
Fracture Energy [J/m2]  ..........:  1.33  Air          Controlled flaw
Fracture Toughness [MPa m1/2].....:  0.44  Air          Controlled flaw


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Date created: 08 February 2001
Last updated: 08 February 2001

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