2 results about "Relaxation modulus" patented technology

The application discloses a kind of viscoelastic material relaxation modulus testing device, including bottom channel steel, bottom channel steel is equipped with fixed screw rod, L type support seat;Fixed screw rod top fixed connection is equipped with fixed end coupling, fixed end coupling is horizontally equipped with lever, and is hinged between fixed end coupling and lever by fixed end pin;L type support seat is fixedly equipped with ball screw sliding table assembly.The application has the advantages compared with prior art: simple structure, convenient to use.The high-speed rotation of stepper motor, the linear motion of sliding table, the low-speed vertical linear motion of loading rod, the spherical indenter is driven into the measured viscoelastic material, and the stress response of the material to the specific strain loading is measured by the pull pressure sensor.The movement law of the indenter is indirectly monitored by the eddy current displacement sensor whether it meets the experimental requirements.Therefore, the relaxation modulus of different viscoelastic materials can be tested and studied, and the parameterization characterization of the relaxation modulus of different viscoelastic materials is realized.

This invention relates to the field of polyethylene pipe technology, and in particular to a method for calculating the strain of high-density polyethylene pipes based on relaxation modulus. The method provided by this invention measures the relaxation modulus G of high-density polyethylene material at different times. t And based on the relaxation modulus G of high-density polyethylene material at different times. t The scalar coefficient G0, along with the temperature-sensitive factors φ and α of the modulus, are obtained. Finally, the strain ε of the high-density polyethylene (HDPE) pipe sample is calculated using the scalar coefficient G0 and the temperature-sensitive factors φ and α of the modulus. The method provided by this invention can predict and improve the anti-sagging performance of HDPE pipes and can be further applied to nuclear power plants, municipal construction, and other fields requiring high-performance polyethylene pipes.