基于多参数强度准则的安全系数定义问题

In this paper, three definitions of safety factor, i.e. conventional safety factor, over load factor and strength reduction factor, are defined for general multi-parameter strength criteria. The limitations of the definitions are unveiled, according to discussion of their mechanical and geometrical meanings and expressions. Mohr—Coulomb criterion, as the simplest multi-parameter strength criterion, is analyzed for three definitions of safety factor in theory and numerical. The conclusion is that it is difficult to apply the present definitions in general multi-parameter strength criteria, and it is necessary to find a new definition which is suitable to a great variety of stress states and strength criteria.