Accuracy and sensitivity of a hole drilling and digital speckle pattern interferometry combined technique to measure residual stresses

Residual Stress Determination by Hole Drilling Combined with Optical Methods

“…Development of the ESPI-hole drilling method continued with a study [80] showing an ability to determine residual stresses with errors typically less than 10%, while another study [81] found errors less than 8% and a minimum stress resolution of 10% of yield stress. A different study [82], though, had less favorable results, with errors between 4 and 37% and a mean of 19%.…”

Combined implementing the hole-drilling method and reflection hologram interferometry for residual stresses determination in cylindrical shells and tubes

“…The second class of developed research tools includes Moire' interferometry and analogous optical techniques [17][18][19][20][21][22]. Fully automated procedures of initial data acquiring and further processing are founded upon electronic and digital speckle pattern interferometry [23][24][25][26][27][28][29][30][31][32][33]. The third development direction assumes constructing a measurement procedure that is capable of obtaining maximum possible volume of information for further highly accurate deriving residual stress components.…”

General approach to residual stresses determination in thin-walled structures by combining the hole drilling method and reflection hologram interferometry

“…Created approaches of the first type include moire' interferometry or analogous optical techniques [25][26][27][28][29]. Fully automated procedures of initial data acquiring are mainly based on electronic and digital speckle pattern interferometry [30][31][32][33][34][35][36]. Automated measurement system founded upon digital holographic interferometry is also created and implemented [37].…”

“…Three main ways, which are suitable for this purpose, can be recognised. The first of them is initially proposed and realised in work [39] and then is implemented in works [31,36]. Its essence resides in holding uniform actual stress field with known parameters over a large area of the object surface.…”