Introduction -- Stress States of Elements -- Basic Characteristics of Strength of Materials under Complex Stress --  Unified Strength Theory (UST) -- Visualization of the UST.- Comparison with Experimental Results -- Unified Yield Criteria (UYC) -- Comparison of the UYC with Experimental Data -- Equivalent stress of the UST -- Economic Signification of the UST -- Applications of the UST -- The Beauty of Strength Theories -- Historical Reviews.

This book thoroughly describes a theory concerning the yield and failure of materials under multi-axial stresses - the Unified Strength Theory, which was first proposed by the author and has been frequently quoted since. It provides a system of yield and failure criteria adopted for most materials, from metals to rocks, concretes, soils, and polymers. This new edition includes six additional chapters: General behavior of Strength theory function; Visualization of the Unified Strength Theory; Equivalent Stress of the UST and Comparisons with other criteria; Economic Signification of the UST; General form of failure criterion; Beauty of Strength Theories. It is intended for researchers and graduate students in various fields, including engineering mechanics, material mechanics, plasticity, soil mechanics, rock mechanics, mechanics of metallic materials and civil engineering, hydraulic engineering, geotechnical engineering, mechanical engineering and military engineering.