| 摘要 |
A test method and apparatus for measuring the dimensional stability of the polymeric products according to thermal variation are provided to measure the relation between the temperature variation of polymer material and deformation rate, between the temperature variation and the power generated due to that, and between the deformation rate and the contraction or expansion rate. A polymeric products test apparatus(100) comprises an upper chamber(102), a lower chamber(116), and an LVDT(152). The upper chamber includes a constant temperature chamber maintaining a constant temperature(104), a temperature control chamber in which a temperature controller for controlling the temperature of the constant temperature chamber is installed, an upper clamp(110) and a lower clamp(111) holding a test piece, and a load cell(114) connected to the upper clamp through an upper connection member. The lower chamber includes a cross head(122) connected to the lower clamp through a lower connection member and arranged to be moved up and down by guide axes(118,120), drive shafts(126,128) screwed and coupled to a threaded hole formed on the cross head and moving the cross head up and down, and a driving unit for rotating the drive shafts. The LVDT includes a measuring arm(146) fixed with the lower connection member in one body and a measuring axis(150) which is integrally connected with the measuring arm by a list, and is fixed to the upper chamber or the lower chamber through a bracket(154). |
