Scientific researchers have been exploring and researching intensity theory for 250 years, but the existing various magnificent intensity theories only describe the phenomena and laws of material damage, and do not reveal the mechanism of material damage, and have not yet risen to the theoretical framework stage. This has also become an unsolved mystery of the material damage mechanism in the world's civil engineering field.
Since 2000, the team of Professor Ding Faxing of Central South University has been deeply engaged in the field of basic research on the strength of engineering materials. Recently, the damage ratio strength theory founded by the team has achieved the original results of , discovered the third parameter of the basic performance of in material mechanics, revealed the mechanism of civil engineering material damage, and broke through the perspective of experimental research on complex stress strength and magnificent theory of materials since 1776. solved the global problem of understanding the mechanism of material damage for more than 200 years.
Ding Faxing, Ph.D., professor at Central South University, winner of the Ministry of Education's New Century Talent and Hunan Outstanding Youth Fund, also serves as the Standing Committee Member of the Inspection, Appraisal, Reinforcement and Renovation Branch of the China Building Metal Structure Association, Director of the Building Structure Branch of the Chinese Architectural Society and Deputy Director of the Hunan Prefabricated Building Engineering Technology Research Center. He presided over 4 national projects, published more than 180 scientific research papers, authorized 12 national invention patents, obtained 2 software copyrights, published 2 monographs, participated in the compilation of 5 industry standards and 3 local standards, and won 2 first prizes for scientific and technological progress at the provincial and ministerial level.
The damage ratio strength theory founded by Ding Faxing's team is based on the highlight of "damage ratio parameters - the lateral deformation effect of inelastic strain of materials". It proposes a basic parameter for the transformation of brittle materials to plastic under high pressure conditions. It is suitable for the analysis of the damage mechanism of brittle materials such as concrete, rock, cast iron and metal plastic materials, and reveals the damage law of compression volume expansion and tensile volume shrinkage of brittle materials. It is the third basic parameter after the elastic modulus parameter proposed in 1807 and the Poisson ratio parameter proposed in 1829, realizing the unity of brittleness and plasticity.
This theory has been recognized by authoritative experts in the international industry: Professor UEDA Tamon, Chairman of the International Organization for Standardization of Concrete (ISO/TC71), President of the Japan Civil Engineering Association, and Academician of the Japanese Academy of Engineering, believes that "the theory of damage ratio strength of concrete is meaningful and helpful for one's own research"; Professor Goto Yoshiaki, former vice president of the Japan Civil Engineering Association, believes that "the concept and derivation process of the damage ratio strength theory are concise, and the damage ratio variable takes into account the impact of hydrostatic pressure"; the deputy editor-in-chief of the ACI Structure and Materials Journal of the American Concrete Research Association and the review experts believe that " damage ratio strength theory is innovative and very important ".
What is more profound is that the loss-to-damage intensity theory is used to guide specific engineering practices, and many scientific and technological problems will be solved in the past and in the future. For example, according to this theory, the compression damage ratio of surface rocks is between 1.7-2.2, which is manifested as brittleness. As gravity increases deep in the earth's crust, the damage ratio will gradually decrease to about 0.5, which is manifested as high-pressure plasticity. This theory goes beyond the previous cognitive limitations: crust rocks are in a three-way compressed state under gravity without damage, and it is believed that crust rocks of different depths are in three stages of elastic brittleness, elastic plasticity and plastic flow, and elastic plastic flow causes energy consumption to increase the internal temperature of the rock. This new cognition will promote a new explanation of surface movement, earthquakes and volcanic eruptions in geological science. At the same time, the damage ratio intensity theory can also achieve "counter-destruction", and solves engineering problems .
"Thinking is the most beautiful flower on the earth", and the spirit of exploration is the most brilliant one among them. For more than ten years, Ding Faxing's team has continuously expanded the application field of damage ratio strength theory with its tireless exploration spirit. At present, the team is calibrating the damage ratio parameters of other brittle materials such as gypsum, glass, and ceramics, and advancing the damage ratio strength theory to orthogonal opposite-sex materials and transverse isotropic materials.
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Article material source: Central South University News Network, Central South University Teachers’ Personal Home Page
