光弾性実験による加圧熱衝撃問題の検討

抄録

This paper describes an experimental study on pressurized thermal shock, PTS, problem by using a photoelastic technique for the purpose of confirming the validity of application of statically indeterminate fracture mechanics to the problem. The following points are made clear from the test results:
(1) Thermal stresses obtained from the photoelastic test results agree well with those given by nonstationary thermal conduction analysis.
(2) Bending moments obtained from observation of photoelastic fringes agree well with those given by nonstationary thermal conduction analysis. It was experimentally confirmed that bending moment occurred by constraint in such structure that bending deformation was restricted. The compliance of the end of specimen was quantitatively evaluated.
(3) The good agreement was observed between the stress intensity factor obtained from observation of photoelastic fringes near a crack tip and that given by application of statistically indeterminate fracture mechanics which was described in the previous paper. It was confirmed that statically indeterminate fracture mechanics which was valid for theoretical evaluation of the stress intensity factor under PTS. Also by this experimental results, It was made clear that bending moment by constraint influenced significantly the stress intensity factor under PTS.