Chengdu Miniature Mechanical Testing Science & Technology Co. Ltd. (MMTS) is a new technology enterprise focused on the development and application of material milli-micro testing technology in collaboration with a research team from Southwest Jiaotong University. Indentation testing and analysis systems include MMTI-S (in-service indentation device), MMTI-R (miniature specimen indentation device), and MMTI-C miniature specimen test device, which are small, portable devices manufactured with multi-purposed test software based on the energy-density equivalence theory (the CC theory). Under the assumption of homogeneity and isotropy of continuum mechanics, the energy-density equivalence of the representative volume element is considered, and the effective deformation domain of a specimen is limited to the milli-micro scale such that the spherical, conical, flat, cone-cone, ball-cone and flat-cone monobloc indenters can be used for indentation loading on the material surface of miniature specimens or components. By applying unidirectional tensile or compressive loading to small-sized structural element specimens (e.g., rings, discs, spheres, and SPT discs) and specimens with cracks (e.g., CT and SEB), the macroscopic deformation behavior of the material can be characterized, and its fundamental mechanical laws and properties can be obtained through the measured load-displacement curves. The CC theory-based test method and the indentation test and analysis systems can overcome the great difficulties faced by traditional test methods in different environments for accurate testing of macroscopic elastic-plastic mechanical laws of structural service materials, welded joints, and small-sized advanced materials in critical projects, such as petrochemical, nuclear power, aviation, and high-speed rail. Basic mechanical properties include elastic modulus, yield strength, tensile strength, Brinell, Rockwell, and Vickers hardness, residual stress, as well as fracture toughness.

The company and chief scientist team presided over and participated in the development of the national standards GB/T21143-2014 "Metallic materials - Unified method of test for determination of quasi-static fracture toughness", GB37782-2019 "Metallic materials - Indentation test - Determination of strength, hardness and stress-strain curve" (in Chinese and English), and T/CSTM 00278-2021 "Ring compression test method for strength and stress-strain relationship of metallic materials". The company and the chief scientist team have been granted more than 10 invention patents based on CC theory and published more than 30 high-level academic papers.