2 results about "Tensile fatigue" patented technology

The utility model relates to a kind of metal composite material high-frequency fatigue test device, including support frame, testing device, protective cover and fixing device, testing device is installed on the support frame, the testing device is used to further test the tensile fatigue strength of metal by constantly increasing the force of stretching;The protective cover is installed on the testing device outside;The fixing device is installed on the testing device, and the fixing device is used to fix the metal to be tested.By the closed transmission chain of motor-reducer-screw integrated in test support, cooperate with the symmetrical limiting rod in displacement groove and displacement block limiting hole, the loading axis and the sample center line always keep high-precision coaxial, avoid eccentric error;Motor support supports reducer independently, suppresses bending deformation and resonance, improves long-term stability;Fixing device realizes sample trace eccentricity compensation, quick plug-in clamping and double-groove limiting positioning with the laminated structure of fixed block-adjusting disc-clamping block-mounting block, and different size samples can be replaced by a person.

The application discloses a method for predicting the fatigue fracture times of wind turbine blade composite materials, comprising the following steps: preparing a plurality of wind turbine blade composite material samples, each sample being prepared with two parallel test samples; taking one parallel test sample of each sample to perform a creep performance test under preset test conditions; taking another parallel test sample of each sample to perform a fatigue performance test; fitting the relationship between the creep strain and the fatigue fracture times; for the wind turbine blade composite material to be tested, performing a creep performance test under the same test conditions to obtain the creep strain, and according to the obtained relationship, obtaining the predicted fatigue fracture times of the wind turbine blade composite material. The method can complete the fatigue performance test and evaluation in a short time, establish a linear correlation model of creep and fatigue, calculate the fatigue fracture data by testing the creep strain data, and experimental results show that the theoretical calculation data is very close to the data obtained by the tensile fatigue performance test.