METHOD OF ASSESSING OPERATIONAL PERFORMANCE OF PROFILED SHEET OF POLYMER COMPOSITE MATERIALS Russian patent published in 2020 - IPC G01M5/00 G01N3/20 

FIELD: test technology.

SUBSTANCE: invention relates to investigation of strength properties of articles based on profiled sheet (PL) for various purposes from polymer composite materials (PCM). Summary: sheet sample is tested by load to actually destructing values of load and deflection and comparison of said values with corresponding design values, including installed in project documentation, standards, regulations and (or) technical conditions. At the first stage of the test, the submarine sample mounted on the support locating blocks of the test rig, loaded with distributed load of specified value, which simulates operating load for specified distance between supports, during specified time interval controlling state of sheet and its deflection. At the same time, it is considered that the sample has passed check provided that its maximum deformations under action of rated load within 5 minutes are not higher than allowable design values. Then at the second stage the sample is additionally loaded with the distributed load of the specified nominal value, imitating the maximum design value, at that, the state of the submarine and its deflection are controlled. Sample is considered to have passed the test provided that it has withstood maximum load for 60 minutes without visually observed signs of failure. At the third stage, the loaded profiled sheet is unloaded and its residual deflection state is monitored; the sample is considered to have passed the test provided that its residual deformations do not exceed allowable design values. Based on the results of tests carried out at three stages, the profiled sheet and articles based on it are stated to be operable under the conditions of their intended use.

EFFECT: technical result is higher accuracy and faster determination of mechanical characteristics of profiled sheet products from PCM based on quite easy to implement in practice procedure.

5 cl, 13 dwg