4 results about "Low stress" patented technology

The application discloses a method for high-flux measurement of high-temperature endurance life of platinum-based materials, and belongs to the technical field of performance testing of platinum-based materials. According to the characteristics of oxidation resistance and weldability of platinum-based materials, different platinum-based material sample heads and tails are welded into a whole sample, the heads and tails of the whole sample are fixed on pull rods respectively, a load is applied on the tail rod, atmospheric high-temperature endurance test is carried out at a certain temperature, the time of fracture of a platinum-based material sample is the endurance life of the material under the stress, the remaining sample is welded into a new whole platinum-based material sample after the platinum-based material sample is cut off, and the high-temperature endurance test is continuously carried out, and the endurance life of different platinum-based materials under the same stress or different stresses is obtained through cumulative calculation after all platinum-based material samples are fractured. The method improves the measurement of endurance life of different platinum-based materials, different stresses and long time under low stress conditions, is high in efficiency, and saves a large amount of time and money cost.

The invention discloses a low-stress dielectric material for a glass substrate and a CTE gradient design method thereof, the low-stress dielectric material is formed by mixing at least two basic dielectric material components with different thermal expansion coefficients in proportion, the thermal expansion coefficient of each basic dielectric material layer is in gradient change from the first layer in contact with the glass substrate to the Nth layer in contact with the outermost layer, the difference value between the thermal expansion coefficient of the first layer and the thermal expansion coefficient of the glass substrate is less than or equal to 0.5 ppm / K; the thermal expansion coefficient of the Nth layer matches the function requirement of the top layer of the device; the difference value of thermal expansion coefficients between adjacent layers is not greater than a preset threshold value (1.0-2.0 ppm / K); the gradient change is realized by regulating and controlling the volume fraction of the components of the basic dielectric material of each layer, and the aim is to minimize the internal and interface thermal stress of the multiple dielectric layers. According to the low-stress dielectric material, the components and the thermal expansion coefficient of the low-stress dielectric material are improved, so that the thermal stress level of an upper-layer medium of a glass substrate can be remarkably reduced, and the compatibility among various materials is higher, the adaptability is stronger, and the light transmittance is better.

The invention discloses a fiber composite material interface performance rapid evaluation method based on a high-stress fatigue loss mode, and the method comprises the steps: constructing a fatigue loss characteristic system database of a fiber reinforced composite material standard sample, and the standard sample system database comprises a low-stress long-term fatigue performance database and a high-stress short-term fatigue performance database; the low-stress long-term fatigue performance database comprises the step of obtaining the fatigue life corresponding to the fiber reinforced composite material under the standard parameters through a low-stress long-term fatigue performance test; the high-stress short-term fatigue performance database comprises a fatigue damage morphology and a tensile property decay rate corresponding to the fiber reinforced composite material under standard parameters obtained through a high-stress short-term fatigue performance test; forming a multi-modal characteristic-fatigue life mapping database according to the fatigue life, the fatigue damage morphology and the tensile property decay rate of the fiber reinforced composite material under the standard parameters; and testing the to-be-tested sample according to a similarity principle, sorting interface performance, and predicting the long-term fatigue life of the to-be-tested sample.