1) In the use of children's amusement facilities, due to the influence of stress and strain, almost all structures and components are relatively changed in shape and size to withstand fatigue loads, and their main form of failure is fatigue failure. The conventional fatigue strength design assumes that assuming that the material does not have initial cracks, after a certain stress cycle, cracks are formed due to the accumulation of fatigue damage, and the cracks continue to expand under stress cycles until full-face brittle fracture occurs. The number of stress cycles before the formation of cracks is called the life without cracks; the number of stress cycles after the formation of cracks until fatigue fracture is called the crack propagation life. The total part life is the sum of the two. In general, the structural life of a device is the basis for determining the natural life of the entire device. Each time the stress cycle causes a certain amount of damage to the component, this damage can be accumulated; when the damage accumulates to the critical value, the component will be fatigued and destroyed. 2) Another effect that affects children's play equipment is wear life. When the objects are moving relative to each other, under the effect of friction, the wear on the friction surface continues to wear out, such as wear between the shaft and the bearings, gear teeth, and wear between the guide wheels and the guide rails, which destroys the fitting dimensions of the components. And strength, when the amount of wear exceeds the allowable limit, it can cause the equipment to fail. The company's Sports Equipment Co., Ltd. is located in the capital of teaching toys - Wenzhou, "the company" is a well-known trademark in China teaching the toy industry, is a leader in teaching toys industry, the company is a collection of design, development, production, sales and service Children's play equipment professional manufacturers. The company's main business: children's slides, combined slides, outdoor development, naughty fort, fitness equipment, children's furniture and other children's play equipment. Company official website:. support hotline. Copying is not to draw an extremely realistic picture, but to learn in the process of copying, why the color relationship in this place is like this, why this kind of physical structure is used here, and so on, we need to think about it. Using the copy table to copy, can make the copied works more intuitively displayed in front of you, light, color, space, body structure, material texture, etc., clearly feel the thickness change of each line of the work, the color gradient process, And then in the process of copying the analysis and understanding thoroughly. A5 LED Light Pad,LED Light Box,Portable A5 Tracing Board Drawing Board Guangdong Jishengke Industrial Co.,Ltd , https://www.jskpads.com