Crack length growth rate measurements Sample Clauses

Crack length growth rate measurements. The crack length, , =is measured using an automated digital-image based technique that has been developed in [37] for tracking of the crack fronts in translucent materials. The method will be referred to as the crack tracking algorithm in the following. The crack tracking algorithm has been applied in recent studies of fatigue-driven delamination under VA loading in [31, 29]. The basic principle of the method is a correlation between the crack front and the diffuse reflected light in translucent materials such as glass/epoxy laminates. In the very early stages of damage, an increased intensity of diffuse reflected light occurs due to crack face separation and the irregular surface of newly formed cracked area such that damaged and undamaged regions can be visually identified [37]. The method can identify the position of the crack front across the specimen width from digital images and application of a series of image processing operations. The crack length, , =is defined here as the average crack length across the specimen width. The authors would like to highlight that the method identifies the position of the crack front, i.e. i=n Fig. 2-3, and bridging fibres will appear in the wake of the crack front. The methods uses the following hardware: A monochrome FLIR Blackfly CCD type camera with a resolution of 2448x2048 pixels, two cool LED white light sources XXXX Xxxxx Daylight to illuminate the top surface of the DCB specimen, and a computer for image acquisition and storage. Images are acquired at a predefined cycle increment 0à, which controls the temporal resolution of the crack length measurements. The process is fully automated and continuous without interruption of the cyclic test. The camera records the top surface of the DCB specimen. The camera’s field of view (FOV) is illustrated in Fig. 2-12. The FOV includes the region of interest (ROI) with respect to crack length measurements and a checkerboard, which is necessary for the crack tracking algorithm (reference pattern, image transformations etc.). The crack tracking algorithm outputs the average crack length, , =across the specimen width as a function of the number of load cycles, .0The resolution of the average crack length across the specimen width is 0.05 mm in the current test campaign. The crack growth rate, @ / =@ , i0s computed for every data point in the ( ,0 )-=data set by fitting a linear function to all data points within a moving fitting window that has been centred around the data ...
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