Effect of Gypsum Cement Composition on Tensile Fracture Initiation from a Circular Hole in Compression

International Multi-Conference on Industrial Engineering and Modern technologies

Suknev, S.V.^1

Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Lenin Ave 43, Yakutsk

677980, Russia^1

关键词: Cement compositions;    Circular holes;    Deformation and fracture;    Dihydrate gypsums;    Fracture criteria;    Initiation and propagation;    Stress gradient;    Tensile fractures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/463/3/032003/pdf
DOI  :  10.1088/1757-899X/463/3/032003

来源: IOP

【 摘 要 】

The presence of dihydrate gypsum in the original composition of cement plays a significant role in the formation of the microstructure of gypsum in the process of hydration. Any variation in the microstructure not only changes the material's mechanical properties, but it also alters the deformation and fracture behaviour. The effects of the original composition on the initiation and propagation of the tensile cracks from the circular holes of various diameters in gypsum under compression have been studied. Test results have been analyzed in regard to the conventional, non-local, and stress gradient fracture criteria. It has been evidenced that, if the content of dihydrate gypsum in the original composition is low, then tensile crack initiation is equally well described by applying either the stress gradient criterion or the non-local criterion under consideration. However, if a dihydrate gypsum share is significant, then the application of the stress gradient criterion is preferable.