Thermal Shock Fracture Toughness by Infrared Radiation Heating Technique

• Published in: Nihon Kikai Gakkai ronbunshū. A Vol. 62; no. 595; pp. 700 - 706
• Main Author: AWAJI, Hideo
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 01.01.1996
• Subjects: Elastic moduli; Electric charge; Float Glass; Glass; Infrared heating; Material Testing; Materials testing; Numerical analysis; Parameter estimation; Physical properties; Stress Intensity Factor; Stress intensity factors; Thermal conductivity; Thermal expansion; Thermal Shock; Thermal Shock Fracture Toughness; Thermal Shock Parameters; Thermal Shock Strength; Thermal Stress
• ISSN: 0387-5008; 1884-8338
• DOI: 10.1299/kikaia.62.700

A recently proposed infrared radiation heating method is successfully applied to float glasses to evaluate thermal shock parameters. This method makes it possible to measure the parameters directly from the electrical power charge. This paper discusses how the thermal shock parameters should be estimated as one of the physical properties of the material concerned, and as a function of the temperature tested. The stress intensity factors are also analyzed numerically for a disk with an edge crack where the disk is charged by a constant heat flux. The thermal shock fracture toughness, R2c, of a float glass is measured by the IR heating technique, and is compared with the estimated thermal shock fracture toughness, λK1c/Eα, which is combined by the temperature-dependent material properties, such as thermal conductivity, λ, fracture toughness of the material, K1c, Young's modulus, E, and coefficient of linear thermal expansion, α, where these values are measured individually. It is shown that the experimental thermal shock fracture toughnesses are coincident with the estimated values.