DEVICE FOR RESEARCH micromechanical characteristics of solids indentation

摘要

The proposed device comprises a base with a vertical bar and the stage, a carriage movably mounted in the guide post and provided with a lever catch, connected with the carriage by a spring parallelogram hollow body, inside which and coaxially with it on the plane-parallel spring-mounted rod with a rigidly fixed at its end indenter and indenter nagruzhatel and means registration efforts and the depth of its implementation. A distinctive feature of the device is the use of a closed nagruzhatelya permanent magnet and disposed inside the core of a material with a "giant" magnetostriction, in particular, TbFe _2, SmFe _2, etc. When this core is an integral part of the rod with the indenter, and the permanent magnet is kinematically connected with a drive of its movement along the core. The induced magnetic field in the core leads to its elongation until the introduction of the indenter into the specimen. From the diagram "load-depth of penetration" is then determined by the material properties, including microhardness HV, yield stress σ _m, the tensile strength σ _b and so forth. The advantage of the device lies in the simplicity of its design while increasing the accuracy of measuring biasing force. ZP 2, 2 fig.