Model Experiments for Thermal Shock Fracture Behavior

Abstract

Thermal shock fracture tests with specimens of simple geometry (plate and hollow cylinder) made from an appropriate model material, glass, were performed to investigate the behavior of cracks under transient thermal loads. The experimental results are compared to theoretical/numerical calculations based on a linear elastic analysis. The fracture mechanics approach used for safety evaluations, for instance in case of emergency core cooling in a reactor plant, is further substantiated.

Prediction of minimum UO/sub 2/ particle size based on thermal stress initiated fracture model. [LMFBR]

“…The reason for this is that with a crack included on the surface of the sphere (whether solid shell or completely solid) the stress field is not rotationally symmetric and a three dimensional solution is required. As a first approximation to the spherical solution Blanel [18] suggested for thermally induced stresses with a crack present the form for K-j-as…”

Fracture Analysis and Material Improvement of Brake Discs

“…For research on thermal fatigue, a variety of methods have been proposed. Coffin (10) , Manson (11) , Northcott (12) , Blauel (13) , and many other researchers (14) have proposed their original methods for thermal fatigue or thermal shock testing. Besides such universal test equipment, other methods relating to products for cast iron and brake discs have been introduced.…”

Transient thermal stress intensity factors of near surface cracks

“…In the above references [26][27][28][29][30] , the effect of cladding^ on the 2 Cladding is the material bonded to the inner wall of a nuclear pressure vessel to protect the base metal from chemical corrosion or detrimental radiation damage. thermal shock resistance was ignored.…”

“…It should also be noted that, in all the transient problems cited here [21][22][23][24][25][26][27][28][29][30][31][32][33][34], the quasi-static theory of thermoelasticity was used, thus, the coupling in the thermoelasticity equations was disregarded. Since the application of photoelasticity in determining for plane problems was first demonstrated by Post [51], Wells and Post [52] and Irwin [53] , great progress has been made in solving problems with this method in various areas.…”