Preparation method of highly brittle transparent rock-like material specimen

Abstract

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.

Description

technical field [0001] The invention relates to a rock-like highly brittle transparent resin material technology, in particular to a preparation method for a highly brittle transparent rock-like material specimen containing three-dimensional built-in cracks. Background technique [0002] The failure process of brittle materials and the evolution law of internal crack propagation have always been the focus and difficulty in the study of solid mechanics. Finding a test material with good brittleness, high transparency and easy presetting of internal cracks is the key point of the experimental research. The brittleness of a material is measured by the ratio of tensile strength to compressive strength. The use of brittle materials can more accurately reflect the stress and deformation characteristics of solids such as rocks. The selection of materials with high transparency can facilitate the observation of the expansion and evolution process of internal cracks. [0003] So f...

AI Technical Summary

Problems solved by technology

Guo Yanshuang (2011) found an unsaturated polyester resin with a pull-down compression ratio of -50°C that can reach 1 / 5, and the degree of brittleness has improved, but the transparency is poor

Therefore, the brittleness of the materials used by the predecessors is not high.

In addition, due to the unsatisfactory toughening process and the material selection of the crack (metal sheet), the stress concentration in the pre-set crack front area is relatively high, and a certain plastic flow will be generated during the crack growth process, which will affect the experimental rules and results. accuracy and authenticity of

It can be seen that there have been serious shortcomings and deficiencies in the materials used by predecessors for many years.

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