Residual Stresses from Incremental Hole Drilling Using Directly Deposited Thin Film Strain Gauges

• DOI: 10.1007/s11340-022-00822-0
• Publication Date: 2022-01-14T17:10:57Z
• Authors: S. Heikebrügge; R. Ottermann; B. Breidenstein; M.C. Wurz; F. Dencker
• Keywords: Strain gauge; GLUE; Hole drilling method; Deep hole drilling

Abstract Background Commonly, polymer foil-based strain gauges are used for the incremental hole drilling method to obtain residual stress depth profiles. These prone errors due application by glue. For example zero setting is thus often erroneous necessary removal of foil and This resulting in wrong use calibration coefficients resolution leading calculations obtained Additionally common sensors limited their regarding e.g. exposure high temperatures. Objective paper aims at a first step into qualification directly deposited thin film with method. With sensors, uncertainties determination absence glue can be reduced minimum. Additionally, new areas interest such as investigation thermally sprayed metallic layers addressed higher temperature resilience component inherent minimal thickness. Methods time, different layouts measurements were manufactured on stainless steel specimen. Strain during using bespoke device conducted. Residual profiles calculated Integral ASTM E837 standard. Afterwards, conventional conducted accordingly. Finally compared characteristic values. Results The from generally match ones based gauges. novel gauges, simplified foil. direct deposition, wide variety rosette designs possible, enabling more detailed evaluation field around drilled hole. Conclusions comparative analysis shows general feasibility measurements. Detailed investigations uncertainty sources still necessary.