ANALYTICAL STUDY OF STRAIN’S RANDOM ERROR ON RESIDUAL STRESSES CALCULATED BY HOLE DRILLING METHOD |
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| Caterina Casavola, Carmine Pappalettere, Francesca Tursi |
- Abstract:
- The hole-drilling method is an effective and popular semi-destructive technique for residual stress (RS) measurement. It consists in drilling a very small hole into the specimen; consequently, RS relaxes in the hole and stresses in the surrounding region change causing strains also to change; a strain gage rosette, specifically designed and standardized measures these strains. Using special stress-strain relationships, the RS field is calculated from the measured strains. Stress calculations are extremely sensitive to errors in the measured strain: small strain measurement errors can cause significant variations in calculated stresses, particularly for stresses far from the surface. This error sensitivity occurs because the strains are measured at the specimen surface, but the desired RS are inside the specimen. This paper presents an analysis of the influence of the strain measurement error on the computed stresses. Particular emphasis is placed on influence of both the number of total steps and the type of step increment. Both the Integral and Power series stress calculation methods are investigated, and their different responses to measurement errors are described.
- Download:
- IMEKO-YSESM-2011-ea42.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC15
- Event name:
- TC15 Youth Symposium 2011
- Title:
10th Youth Symposium on Experimental Solid Mechanics (TC15)
- Place:
- Chemnitz, GERMANY
- Time:
- 25 May 2011 - 28 May 2011