Li Qingzhong, Yao Jinhui, Xu Hang, Li Haigen, Li Ting Yuan
10 MN BUILD-UP FORCE STANDARD MACHINE DEVELOPED IN CHINA
The paper describes a 10 MN Build-up force standard machine developed in China. The BM has capacity of 10 MN compression, relative expanded uncertainty of 0.05% (k = 2, probability being about 95%) which has been evaluated based on characteristics of three load cells as reference as well as on force comparison with 20 MN hydraulic amplification force standard machine established at NIM being relative expanded uncertainty of 0.01%(k = 3), force fluctuation of less than ±0.002%,etc. The BM is driven by a hydraulic system with a technology patented in China, which makes loading speed quicker and much stable as well as unloading. The force measuring system is similar to the other BM such as 9 MN BM established by LNE/France, and one by INRIM/Italy, etc.