The invention discloses a preparation method of a high-
brittleness transparent rock material test piece. The preparation method comprises the steps of resin
material selection, selection of materials for forming three-dimensional prefabricated built-in elliptical cracks, molding and space location. Raw materials comprise CY-39 type resin and YS-T31 type curing agent, wherein the
mass ratio of the CY-39 type resin to the YS-T31 type curing agent is 100: 34, or and the volume ratio of the CY-39 type resin to the YS-T31 type curing agent is 100: 41. The preparation method comprises the following general steps: (1) weighing the materials; (2) mixing the materials; and (3)
casting, molding and maintaining.
Mica plates with the thickness of 0.12mm are used for forming the prefabricated cracks, and an elliptical steel mold with the corresponding size is used for
cutting the
mica plates into the required accurate size. The preparation method is characterized in that different parts of a left side face plate and a right side face place of the mold are drilled, a
thin line is used for pulling, fixing and connecting the prefabricated cracks, the two ends of the
thin line are fixed in holes of the two side face plates so as to play a role of accurate location, and three-dimensional crack test pieces with different numbers of cracks at different angles and different opposite locations are manufactured. The test piece prepared by the method has the characteristics of good
brittleness, high transparency, easiness for molding and observing crack extension process and the like.