Explanation

Spiral deformation refers to the phenomenon that the deformation of materials gradually increases with time under the action of a certain temperature and constant stress, which is the performance of viscoelasticity of materials. The creep resistance of materials refers to the ability of materials to maintain shape under certain temperature and constant external force. The external force can be tensile force, shear force, or compressive force. According to ASTM D2990-09 test standard, materials creep resistance test sample is the same as tensile test sample, which can be measured at room temperature [(23 ± 2) ° C] or high temperature. At each temperature, at least three different stresses are generally selected, and the testing time at each stress is not less than 1 OOAh. The results obtained include initial creep stress, creep modulus, etc. The higher the initial creep stress or creep modulus, the better the creep resistance of materials.

Classification