简介:Thebasicrelationsinlinearisotropicphotoviscoelasticityhavebeentheoreticallydiscussedinde-tails.Anewroutinehasbeenfoundtoobtainthetime-dependentprincipalstresswithoutthemeasurementofisoclinics.Asatestofourmethod,examplesaregivenattheendofthispaper.