4 results about "Cyclic number" patented technology

The invention discloses a nonparametric prediction method for the fatigue life of a steel-FRP composite bar, and belongs to the field of fatigue performance evaluation of civil engineering materials and structures, and the nonparametric prediction method comprises the following steps: initializing component material attributes, load conditions and initial states of the steel-FRP composite bar, the component materials comprising an inner core steel bar and an FRP layer; according to an equivalent stiffness distribution principle, fatigue stresses of the component materials are calculated respectively; according to the fatigue stress of the component material, theoretical fatigue life of the component material is obtained in combination with the S-N curve relation, and cyclic jumping is executed; calculating accumulated fatigue damage of the component materials respectively based on results after cyclic jumping; and circularly updating the dynamic stiffness and the equivalent cycle number of the component material until the accumulated fatigue damage of any component material reaches a critical threshold value, judging that the component material is invalid, and outputting the fatigue life. According to the method, the fatigue life of the steel-FRP composite rib can be efficiently and accurately predicted, and the test cost is remarkably reduced.

The application discloses a random digital anti-fake image generation and application method, which comprises the following steps: 1) acquiring an infinite non-cyclic number; 2) determining the size of a digital anti-fake image; 3) extracting W*H numbers from the infinite non-cyclic number calculated in step 1); 4) generating a two-dimensional initial random image based on the extracted W*H numbers; 5) performing reinforcement processing on the initial random image to obtain an optimized random image; and 6) associating and combining the optimized random image with a specified two-dimensional code or bar code to generate an anti-fake code with high randomness and uniqueness. The application utilizes the digital distribution randomness of the infinite non-cyclic number to form a two-dimensional image, and then performs corresponding feature enhancement processing, so that the two-dimensional image becomes an anti-fake digital image with randomness, uniqueness, difficulty in replication and easiness in identification.

The invention relates to a method for manufacturing a component (1) made of a composite material, comprising one or more layers (2, 3) associated with one another. The method involves a series of steps (4) for the fatigue design of the component (1), comprising: (A) a first step of generating a discretized model (5), for example by means of a finite element model of the component (1), in which at least a first layer (2) and, as needed, at least a second layer (3) are divided into two or more first portions (6) and two or more second portions (7), respectively; (B) a second step of defining positions of one or more first injury initiation sites (8) and one or more second injury initiation sites (9) within each of the two or more first portions (6) and each of the two or more second portions (7), respectively; (C) a third step of assigning a fatigue strength parameter to each of the damage initiation sites; (D) a fourth step of establishing a load history to be simulated on the component on the basis of specific load conditions, the total number of cycles (NC) to be simulated being divided into discrete cycle blocks, each of which is assigned a load condition.

A method for determining the approved life of a high-reliability wheel disc comprises the steps that a reference state is determined according to the design and use working conditions of an engine, and the stressed weak part of the wheel disc in the reference state and the corresponding stress value and temperature value are calculated; according to the stress value, determining a cyclic stress parameter of a weak part of the stress of the wheel disc, designing a simulation piece in combination with the structural characteristics of the weak part of the stress of the wheel disc, and performing a fatigue test on the simulation piece to obtain a failure cycle number of the simulation piece; calculating the life divergence coefficient of each weak part of the wheel disc; and carrying out a low cycle life pre-test on the simulation piece to obtain the life base number N failure i of each weak part of the wheel disc, and calculating the high-reliability approved life N reliability i of the wheel disc in combination with the life divergence coefficient of each weak part of the wheel disc. The service life divergence of different parts of the wheel disc is obtained through the simulation part, the wheel disc high-reliability approved service life is obtained by combining the wheel disc service life base number, and service life determination is more reliable.