A significant portion of premature tire failures is attributable to defects existed in the tire. Excessive stress levels developed by stress concentrations induced by flaws usually cause premature failure of tires. Therefore, one avenue to minimize such occurrences is to identify and reject defectiv...
A significant portion of premature tire failures is attributable to defects existed in the tire. Excessive stress levels developed by stress concentrations induced by flaws usually cause premature failure of tires. Therefore, one avenue to minimize such occurrences is to identify and reject defective tire. Practical methods for nondestructive testing (NDT) of tires are still being sought. Existing methods for a nondestructive testing of tires include visual inspection, air needle technique, X-rays, ultrasonic testing, wave inspection, phase analyzer, holography and so on. Each method has one or more limitations such as radioactivity, scanning, contacting and sensitivity to environmental vibration rendering is to be either impractical or ineffective as an industrial inspection tool. In 1972 Hung developed new laser interferometry technique called Shearography, which is remarkably insensitive to environmental vibration and is able to inspect object with whole-field and non-contact. This technique has introduced to the aerospace industry for the inspection of composites and honeycomb structures and also offered important new capabilities for the non-destructive testing of tires. Although, comparing with early Shearography, film based Shearogrpahy provides some improvement, the use of film still has significant disadvantages. It is expensive and difficult to implement as a process control in todays production environment. In addition to, one drawback common to all the method is that it lacks the ability of directly determining the criticality of flaws. This drawback makes the decision of acceptance or rejection very difficult. Many of the images still require considerable training to interpret. Therefore, real time inspection technique and easy quantitative analysis technique are required for industrial application. Digital Shearography based on electronic devices, CCD camera and PC, and image processing technique solve many problems in film based Shearography. In this study, industrial application technique of digital Shearography and quantitative analysis technique of defects inside of tires are described. Separations and actual voids induced by road driving test or abnormal manufacturing processing are inspected and evaluated quantitatively. There are many effect factors, such as amount of shearing, shearing direction, induced load, etc., for the quantitative analysis. These factors depend on inspectors skill positively but also affect in-situ workability. In this paper, these effective factors in Shearography are optimized for quantitative analysis and the size of inside crack is determined. This paper will give a thorough review of major optical method in tire industry.
A significant portion of premature tire failures is attributable to defects existed in the tire. Excessive stress levels developed by stress concentrations induced by flaws usually cause premature failure of tires. Therefore, one avenue to minimize such occurrences is to identify and reject defective tire. Practical methods for nondestructive testing (NDT) of tires are still being sought. Existing methods for a nondestructive testing of tires include visual inspection, air needle technique, X-rays, ultrasonic testing, wave inspection, phase analyzer, holography and so on. Each method has one or more limitations such as radioactivity, scanning, contacting and sensitivity to environmental vibration rendering is to be either impractical or ineffective as an industrial inspection tool. In 1972 Hung developed new laser interferometry technique called Shearography, which is remarkably insensitive to environmental vibration and is able to inspect object with whole-field and non-contact. This technique has introduced to the aerospace industry for the inspection of composites and honeycomb structures and also offered important new capabilities for the non-destructive testing of tires. Although, comparing with early Shearography, film based Shearogrpahy provides some improvement, the use of film still has significant disadvantages. It is expensive and difficult to implement as a process control in todays production environment. In addition to, one drawback common to all the method is that it lacks the ability of directly determining the criticality of flaws. This drawback makes the decision of acceptance or rejection very difficult. Many of the images still require considerable training to interpret. Therefore, real time inspection technique and easy quantitative analysis technique are required for industrial application. Digital Shearography based on electronic devices, CCD camera and PC, and image processing technique solve many problems in film based Shearography. In this study, industrial application technique of digital Shearography and quantitative analysis technique of defects inside of tires are described. Separations and actual voids induced by road driving test or abnormal manufacturing processing are inspected and evaluated quantitatively. There are many effect factors, such as amount of shearing, shearing direction, induced load, etc., for the quantitative analysis. These factors depend on inspectors skill positively but also affect in-situ workability. In this paper, these effective factors in Shearography are optimized for quantitative analysis and the size of inside crack is determined. This paper will give a thorough review of major optical method in tire industry.
주제어
#타이어 Shearography 내부결함 정량평가
※ AI-Helper는 부적절한 답변을 할 수 있습니다.