Method for determination of durability of strained polymeric materials in aggressive mediums

This invention pertains to the field of physical-search methods using what could be determined and foreseen the durability of strained polymeric materials in aggressive mediums. The thermal shrinking polymeric material preliminary led to molecular orientation-condition (to strain condition) could be included in strain-deformation systems. The macromolecules of that materials could be sewn under effect of ionising radiation or of chemically agents by forming spatial structure. The mentioned materials have a memory accordingly to said form by repeatedly heating. The said materials could stay in strain-deformed condition after process of thermo-shrinking, if the shrinking process has not been complete. The method is characterised in that the spreading-speed of ultrasound surface-waves has been determined in material being situated in aggressive mediums under strain-deformed condition. Judging from the said spreading speed being determined in such way, there could be determined critically strain-power caused destroying-process of material that could be leaded to splitting of them.