Research of textile reinforced engineering cementitous composite fracture mechanical properties
The application prospects of textile reinforced engineered cementitious composite(TRECC)that combines the advantages of cement-based composite(ECC)and textile-reinforced mortar(TRM)materials,has broad application prospects in building structures.At present,in the study of the mechanical properties of TRECC,there are few related studies on the fracture properties of TRECC,and the discontinuity and discreteness of TRECC cannot be ignored,and the fracture parameters obtained by the traditional mechanical model based on the assumption of continuity and uniformity have obvious dimensional effects.In view of this,it first analyzes the fracture performance of TRECC plates with different seam height ratios by four-point bending test,and clarifies the fracture mechanism.Subsequently,the microscopic characteristic parameters Cch and discrete coefficient are introduced β reflect the non-uniformity and discontinuity of the material,respectively.Furthermore,based on the boundary effect model,the prediction models of TRECC real tensile strength ft and real fracture toughness KIC were established.According to the failure characteristics of the plate,the value of Cch was determined.Combined with the ultimate load measured in the test,the real fracture parameters of different specimens were determined.By comparing the real fracture toughness KIC and the instability fracture toughnessKICunof TRECC,it is found that the fracture toughness of TRECC analyzed by the traditional fracture mechanics model is lower than the true value.
TRECCfailure process analysisfracture toughnessboundary effect model
万方数据
维普
