A UNIFIED MULTIAXIAL FATIGUE DAMAGE PARAMETER
摘要
According to the critical plane principle,a unified multiaxial fatigue damage parameteris presented based on the varying behaviour of the strains on the critical plane.Both the parameters ofthe maximum shear strain amplitude and normal strain excursion between adjacent turning points ofthe maximum shear strain on the critical plane are considered in the multiaxiaI fatigue damage parame-ter presented.An equivalent strain amplitude is made with both parameters of the maximun shearstrain amplitude and normal strain excursion by means of yon Mises criterion.Thus a new multiaxialfatigue damage model is given based on the critical plane approach.The results show that the multiaxi-al fatigue damage parameter proposed in this paper may be used under either proportional or nonpro-portional loading,and may also be reduced to a uniaxial form.It is used to predict multiaxial fatiguelife and good agreement is demonstrated by experimental data.