基于数字图像相关的玄武岩纤维泡沫混凝土压缩损伤研究OA

To investigate the compressive damage evolution law of basalt fiber reinforced foam concrete,this paper employed quasi-static compression tests and utilized digital image correlation technology for full-field strain analysis.It explored the effects of matrix density(600～1 200 kg/m3)and basalt fiber volume content(0%～0.5%)on the mechanical properties and damage behavior of basalt fiber reinforced foam concrete.The results indicate that the most significant improvement in the ultimate compressive strength of basalt fiber reinforced foam concrete is achieved when the basalt fiber volume content is 0.3%or 0.4%.The compression process of basalt fiber reinforced foam concrete can be divided into four stages:compaction,linear elastic,plastic,and failure.Furthermore,based on the full-field,full-process strain data acquired via digital image correlation,this study defined a damage degree factor and a damage localization coefficient to quantitatively characterize and analyze the material's damage extent and localization behavior.The incorporation of basalt fiber effectively increases the initial damage load of basalt fiber reinforced foam concrete,delays the damage evolution process,reduces the degree of damage localization,and alters the material's failure mode.