Multi-level Amplitude Fatigue Loads Of The Fatigue Cumulative Damage RPC Research

Reactive powder concrete (Reactive Powder Concrete, referred to as RPC) is a new type of concrete material with ultra-high intensity, high toughness, high durability, and so on. However, these researches are very little both at home and abroad. Such as load of fatigue performance, the evolution of the mechanism of injury and damage model, as well as the remaining life prediction. In the light of this, in this paper will carry out tests on the basis of the study, the contain reads as follows.1. Analyzed and summarized the ordinary concrete, such as multi-stage increase in the fatigue load fatigue performance research methods, on the basis of the fatigue properties of RPC clear idea of the total work for this paper, the guiding principles.2. Through the static and constant amplitude cyclic loading experiments of RPC specimens, the damage pattern and evolution of macro-creak were observed. The developments of specimen deformation with the increase of recurrent times were measured, as well as the fatigue lives of specimens under different stress level.3. To the internal composition of materials and materials in response to fatigue damage based on the relationship between, based on energy liberation theory of fracture mechanics, the damage behavior of RPC under fatigue loading was analyzed, the observed phenomenon and rules from the tests were explained rationally. The damage variable was defined through describing evolution of residual strain. Combined with test results, the curve of damage evolution were obtained.4. Based on the continuum damage mechanics and fatigue behavior of RPC, the elementary form of damage evolution equation and its parameters were determined. By strict mathematical deduction, damage evolution equation of RPC was generalized to the condition where multistage amplitude loading is applied. Associating with S-N curve, this model could be used for fatigue damage and residual life calculation.5. In this paper, the model (the equivalent injury law) , the remaining strength of the attenuation law, the deformation calculated the evolution of the decision of the remaining life compared with the measured values and found that the equivalent injury law can better predict the fatigue life of the remaining RPC.