An extension of the contour method is presented which allows the measurement of multiple stress components bymaking multiple cuts. In the contour method, a body is carefully cut in two using wire electric discharge machining(EDM). The contours, or shapes, of the cut surfaces are then measured and used to calculate the original residualstress normal to the cut plane using a simple finite element calculation. In the extension presented here, the twopieces from the original body can be cut again in a transverse direction, and the contours of the new cut surfacesare measured. The stresses calculated on the planes of these second cuts have been affected by the first cut.Then a simple inverse reconstruction using information already provided by the calculation for the first cut givesthe original stresses on the plane of the subsequent cuts, removing the effect of the first cut. The method isdemonstrated first by means of 3D FE simulations, and possible errors are explored. In order to validate themethod, an experimental test on a quenched plate of HSLA-100 steel was carried out.
|Numero di pagine||13|
|Stato di pubblicazione||Published - 2007|
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