Local gradient damage model construction method based on elastic strain energy density decomposition

• Main Authors: WANG JICHANG, WU BAIJIAN, GUO XIAOMING
• Format: Patent
• Language: Chinese; English
• Published: 16.12.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTEDFOR SPECIFIC APPLICATION FIELDS; PHYSICS

The invention discloses a local gradient damage model construction method based on elastic strain energy density decomposition. The method comprises the following steps: decomposing the elastic strain energy density into a stretching part and a compression part based on a strain tensor spectral decomposition method; the equivalent strain based on the energy norm is decomposed into a stretching part and a compression part, and the stretching part in the equivalent strain is used for regularizing damage caused by the stretching part in the elastic strain energy density; the decomposed elastic strain energy density and equivalent strain are introduced into a finite element numerical framework through discretized static balance and micro-force balance equations, and a local gradient damage model is constructed. According to the method, the problem of false damage caused by the compression part due to the fact that the elastic strain energy density is not decomposed is solved, especially the problem of concrete co