文档介绍：Abstract
Strain gage based load cell are widely used in the measurement of many kinds of high-precision instrument, however, the designation 、 manufacture of
high-precision load cell in our country are relatively backward. The critical point that restrict its improvement is the manufacturing technique of the substrate in load cell. To satisfy the operating requirement of high-precision sensors, a kind of film substrate made of glass fiber(GF) reinforced epoxy posites was developed, and the morphology, microstructure and mechnical properties of the substrate were studied by kinds of experimental analysis. The main cont ents and results are as follows:
Firstly, the solid and liquid epoxy resin were mixed with each other in the internal mixer, then the film substrate based epoxy resin was obtained, to examine its properties with the traditional substrate made with solvent, dynamic mechanical analysis(DMA) was used to have a test. The result showed that under glass transition temperature(Tg), the storage modulus of solvent -free film substrate was two times of that of solvent film substrate, and the creep of solvent -free substrate decreased fast with increasing pared with the solvent substrate.
Secondly, different contents of glass fiber with the diameter of 1 mm were mixed with epoxy resin in the internal mixer, and then the substrate made of glass fiber reinforced epoxy resin was obtained. The distribution of glass fiber with different contents in the epoxy resin were observed with Scanning Electron Microscopy(SEM), and it turned out that only those with 10% glass fiber or more can interweave with each other homogeneously. Different curing pressure of epoxy resin film were observed with optical microscope, the result showed that the surface of film cured under high pressure was smooth, then pressurized curing was adopted.
Thirdly, the curing process of pure epoxy resin and glass fiber reinforced posites were investigated with Differential Scanning Calorimetry(DS