The American Aerospace Daily reported that Battelle has developed a low-cost method for predicting the fatigue strength of welded structures, which are widely used in military aircraft and ships.
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€
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€
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