The formula of a J integral presented by J.R.Rice is extended to problem of 2 D variable thickness plates.The extended J integral formula is derived in terms of the path independent.Then the integral conservation is v...The formula of a J integral presented by J.R.Rice is extended to problem of 2 D variable thickness plates.The extended J integral formula is derived in terms of the path independent.Then the integral conservation is verified by using finite element method.At last,the calculation results for some variable thickness plates made of photoelastic material are compared with their photoelastic test data,and the differences between them are less than 4%.It is proved that the extended J integral formula for the 2 D variable thickness plates is path independent and can be taken as a fracture pamarater for damage tolerance analysis.Furtheremore,this integral can be solved numerically by using 2 D general finite element programs.It is therefore of practical value for the fracture analysis of Ⅰ mode cracked plate with thickness which does not vary too mueh.展开更多
This paper discribes the experimental work on the research of disc bursting speed.The bursting speed tests for a series of disc models are made successfully.That means:such a difficult experimental technique has been ...This paper discribes the experimental work on the research of disc bursting speed.The bursting speed tests for a series of disc models are made successfully.That means:such a difficult experimental technique has been mastered;and the reconstructed horizontal test rig is suitable for the research of disc bursting speed at normal atmospheric temperature and with heating.The results obtained from experiments and calculations are coincident.This work provides the basis for the further research on the bursting speed of aeroengine discs.展开更多
文摘The formula of a J integral presented by J.R.Rice is extended to problem of 2 D variable thickness plates.The extended J integral formula is derived in terms of the path independent.Then the integral conservation is verified by using finite element method.At last,the calculation results for some variable thickness plates made of photoelastic material are compared with their photoelastic test data,and the differences between them are less than 4%.It is proved that the extended J integral formula for the 2 D variable thickness plates is path independent and can be taken as a fracture pamarater for damage tolerance analysis.Furtheremore,this integral can be solved numerically by using 2 D general finite element programs.It is therefore of practical value for the fracture analysis of Ⅰ mode cracked plate with thickness which does not vary too mueh.
文摘This paper discribes the experimental work on the research of disc bursting speed.The bursting speed tests for a series of disc models are made successfully.That means:such a difficult experimental technique has been mastered;and the reconstructed horizontal test rig is suitable for the research of disc bursting speed at normal atmospheric temperature and with heating.The results obtained from experiments and calculations are coincident.This work provides the basis for the further research on the bursting speed of aeroengine discs.
