The present paper reports the major results of the fractal approach to scaling of mechanical properties in solid mechanics. Among them, it will be put forward the size-independent fractal cohesive crack model and the definition of fractal quantities (hence with non-integer dimensions) which are the true material size-independent properties. Particular attention is paid to the fractal strain, defined by means of fractional calculus, and to the Principle of Virtual Work for fractal media.
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