Measurement of Residual Stresses by the Hole-Drilling Strain Gage Method

EA-XX-062RE-120 This geometry conforms to the early Rendler and Vigness design (Ref. 5 ) and has been used in most reported technical articles (see references). It is available in a range of sizes to accommodate applications requiring different hole diameters or depths.

CEA-XX-062UL-120 This rugged, encapsulated design incorporates all practical advantages of the CEA-Series of strain gages (integral copper soldering tabs, conformability, etc.). Installation time and expense are greatly reduced, and all solder tabs are on one side of the gage to simplify leadwire routing from the gage site. It is compatible with all methods of introducing the hole, and the strain gage grid geometry is identical to the 062RE pattern.

CEA-XX-062UM-120 Another CEA-Series strain gage, the 062UM grid widths have been reduced to facilitate positioning all three grids on one side of the measurement point as shown. With this geometry, and appropriate trimming, it is possible to position the hole closer to welds and other irregularities. The user should be reminded, however that the data reduction equations are theoretically valid only when the holes are well removed from free boundaries, discontinuities, abrupt geometric changes, etc. The UM design is compatible with all methods of introducing the hole.