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A Novel Method for Measuring Crack Propagation Speed and Shape Using Light Measurement Techniques
Introduction
Cracks in materials can cause catastrophic failures in engineered structures, which can lead to loss of life and property damage. Therefore, the measurement of crack propagation speed and shape is critical in determining the lifetime and safety of structures. Traditional methods for measuring crack propagation include strain gauges, crack-opening displacement (COD) measurements, and acoustic emission (AE). However, these methods are time-consuming, expensive, and complex. In this article, we propose a novel method to measure crack propagation using optical measurement techniques.
Method
The proposed method of measuring crack propagation speed and shape involves the use of a high-resolution camera equipped with an appropriate lens and optical filters to capture images at high frame rates. A laser is used to illuminate the crack surface, and images are captured simultaneously. The image data is converted into a numerical form that can be analyzed using software.
The experimental setup consists of a sample specimen in an environment controlled chamber. The sample is loaded until the initiation of a crack, and the loading is continued until the crack propagates to a predetermined length. The camera captures images of the crack from a distance, and the images are analyzed to determine the crack shape and propagation speed.
Results
The proposed method was used to measure the propagation speed and shape of a crack in a polycarbonate sample. The results show that the crack propagation speed can be accurately measured using the proposed method, and the crack shape can be modeled in three dimensions.
A comparison of the proposed method's results to COD indicated a high level of agreement, indicating that the proposed method could be used as a reliable alternative to traditional methods for measuring crack propagation.
Conclusion
In conclusion, we have proposed a novel method for measuring crack propagation speed and shape using optical measurement techniques. The results demonstrate that the method is accurate, non-destructive, and able to provide detailed information on crack propagation.
Future work will involve testing the proposed method in different materials, different loading conditions, and various environmental conditions to determine its robustness and reliability. The proposed method has the potential to be used in a range of applications, including the evaluation of the structural integrity of aerospace components, automotive components, and civil engineering structures.