Methods of statistical analysis of nondestructive testing results
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 77, Issue 1
Abstract
Nondestructive testing methods of control or crack-detection is a general name for all methods of materials or products control used for finding defects, homogeneity of macrostructure, the chemical composition variations and other uses, that do not require the destruction of samples of material or product as a whole. Widespread use of non-destructive methods of control to avoid heavy losses in time and material costs, provide partial or full automatic operation control while significantly improving the quality and reliability of products and parts. No one technological process for manufacturing product is introduced into the industry without an appropriate system of non-destructive testing. It is needed to choose equipment for testing parts or products of nondestructive testing methods that will meet the task, that is, the devices with sufficient degree of reliability that will identify the most dangerous and characteristic defects in the controlled product or part. The second condition is the task of needed degree of reliability of defects, which are dangerous for operating of part or product. And the third condition is the adjustment of the controlling apparatus, namely, the selection of sensitivity and permitting its capacity so as to satisfy the second condition. The proposed method of statistical analysis of the results processing of nondestructive testing of parts and products involves the defining of medium-sized defects and sizedispersion, distribution of defects by size. The calculating of probability of defectfinding of a given size is proposed taking advantage of the Gaussian function. To find the integrals of errors it is necessary to find mathematical expectation, to calculate the dispersion and set maximum allowed defect sizes, only one defect being missed.
Authors and Affiliations
Dmytro Shmatco, Olena Kochneva
Keywords
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