About the Lecturer

Wang Chong, associate professor of Sichuan University, deputy director of Sichuan Provincial Key Laboratory of Damage Mechanics and Engineering Disaster Prevention and Mitigation, and deputy dean of the Department of Mechanics at Sichuan University, engages in the study of long lifetime fatigue damage accumulation of materials and the lifetime estimation of materials based on heat dissipation. Prof. Wang has adopted the new method of accelerated fatigue test in conjunction with in situ dynamic observation and studied material damage and degradation mechanism under low-cycle stress. He published over 30 papers on SCI and EI and acquired 6 patents, and was invited to deliver reports on parallel sessions of some international conferences like ICF14, SEM204, Fatigue13, etc. He also has presided over Youth Science Foundation Projects of the National Natural Science Foundation of China, General Research Projects and other ones at provincial and ministerial levels.

About the Lecture

The knowledge of fatigue crack initiation and propagation at the notch is the basis of the study of damage tolerance for structure, since the fatigue cracks often result from stress concentration in engineering structures. Based on the characteristics of displacement distribution for fatigue specimens and with the application of ultrasonic frequency fatigue loading technique and the in-situ observation approach of real-time optical microscopy for the notch front, the lecturer will discuss the results of very-high circle fatigues developed from the initiation at the notch to the propagation under the very-high circle cyclic load. Analysis of the images for the in-situ observation of crack propagation and for the fracture under SEM with high magnification indicates the propagation behavior of specimens with prefabricated notch under cycles of loads with low stress amplitude.