Montanari Roberto, Varone Alessandra
Department of Industrial Engineering, University of Rome "Tor Vergata", 00133 Rome, Italy.
Materials (Basel). 2021 Apr 1;14(7):1742. doi: 10.3390/ma14071742.
FIMEC (flat-top cylinder indenter for mechanical characterisation) is an instrumented indentation test employing a cylindrical punch. It has been used to determine the mechanical properties of metallic materials in several applications of industrial interest. This work briefly describes the technique and the theory of indentation with a flat-ended punch. The flat indentation of metals has been investigated through experimental tests, and an equation has been derived to calculate the yield stress from the experimental data in deep indentation. The approach is supported by many data on various metals and alloys. Some selected case studies are presented in the paper: (i) crank manufacturing through pin squeeze casting; (ii) the evaluation of the local mechanical properties in a carter of complex geometry; (iii) the qualification of Al billets for extrusion; (iv) stress-relaxation tests on CuCrZr heat sinks; (v) the characterization of thick W coatings on CuCrZr alloy; (vi) the measure of the local mechanical properties of the molten-zone (MZ) and the heat-affected zone (HAZ) in welded joints. The case studies demonstrate the great versatility of the FIMEC test which provides information not available by employing conventional experimental techniques such as tensile, bending, and hardness tests. On the basis of theoretical knowledge and large amount of experimental data, FIMEC has become a mature technique for application on a large scale in industrial practice.
FIMEC（用于机械性能表征的平顶圆柱压头）是一种采用圆柱形冲头的仪器化压痕试验。它已被用于在多个具有工业应用价值的领域中测定金属材料的机械性能。这项工作简要描述了平头冲头压痕的技术和理论。通过实验测试对金属的平面压痕进行了研究，并推导了一个方程，用于根据深压痕实验数据计算屈服应力。该方法得到了许多关于各种金属和合金的数据支持。本文给出了一些选定的案例研究：（i）通过销挤压铸造制造曲柄；（ii）评估复杂几何形状的箱体中的局部机械性能；（iii）挤压用铝坯料的质量鉴定；（iv）对CuCrZr散热器进行应力松弛试验；（v）表征CuCrZr合金上的厚钨涂层；（vi）测量焊接接头中熔合区（MZ）和热影响区（HAZ）的局部机械性能。这些案例研究证明了FIMEC试验具有很强的通用性，它能提供采用拉伸、弯曲和硬度测试等传统实验技术无法获得的信息。基于理论知识和大量实验数据，FIMEC已成为一种在工业实践中大规模应用的成熟技术。
