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Pingsha Dong, the inventor of the method, said in the "Aerospace Daily": "The defense industry, especially the aerospace industry, widely uses welding technology, especially at the corner joints. But this process saves money. At the same time as weight loss, it also brings the problem of fatigue cracking. In the past aircraft and ship design, this has received special attention. Although weight reduction is very important, it will bring serious damage to manufacturing. The problem is to ensure safety, in the critical parts of fatigue, manufacturers often take too much design margin and increase the thickness of the side of the way to solve."
Battelle, based in Columbus, Ohio, said that although there are significant differences in modeling and testing regulations between different industries, it can be said that the amount of money spent on testing, modeling, and fatigue life prediction of welded structures is annual. One billion dollars. The stress concentration calculation method used in the past and the present is based on empirical data, and is very sensitive to the calculation model used, and the obtained result has certain uncertainty.
The inventor of the technology also said: "Two people who are engaged in stress analysis, if they do not communicate with each other or do not use the same software, the results they measure will be completely different. So the results and structure have to be Fatigue life combined with analysis."
The new invention is called a “factual statementâ€, a method implemented by a computer program, rather than a sensitive calculation method that correlates all fatigue tests and uses a set of data to predict fatigue life. Therefore, it is easy to predict the fatigue life of the welded parts.
According to Battelle, “The accuracy of this method is much higher than any currently used method, which reliably predicts the fatigue life of a welded structure without regard to the complexity of the part being welded and the extensive modeling details. â€
Description
A grinding machine, often shortened to grinder, is a machine used for grinding, which is a type of machine using an as the pulverizer .
The external force in the grinding process includes pressing, shear, impacting and grinding. Pressing is mainly used in coarse crushing and secondary crushing for hard materials and large materials. Shear is primarily used in breaking and crushing, suitable for tough and fabrous materials. Impacting is mainly for crushing and disaggregation, suited to brittle materials. Grinding machine is mainly applied to ultrafine grinding and superfine grinding.
Classification
According to the fineness of the materials required (90% of the materials achieve expected fineness), pulverizer equipment can be classified into four types: crusher (more than 60 mesh), grinder (60 to 120 mesh), superfine mill (120 to 300 mesh) and super micro pulverizer (more than 300 mesh).
Universal Pulverizer,Coarse Crusher,Micro Grinder,Grinding Machine
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