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Experimental Stress Analysis NOTEBOOK Issue 13 - April 1990 Contents Thirteen something - Editorial ... Page 1 - Reaffirmation of the purpose for publishing NOTEBOOK; announcement of a reader's survey. (See also Issue 14 for results.) Question & Answer Service - Strain Measurement Technology ... Page 2 - Answers to the six questions about strain gages most commonly asked by our customers. A Four-wire Constant-current Measurement Circuit - Strain Measurement Technology ... Page 3 - Circuit fundamentals of a four-wire constant-current system for making dynamic measurements of strain. Includes discussions of leadwire effects, signal levels, thermal output, and signal nonlinearity. The Real Thing Revisited - Student Exercise ... Page 7 (An online version is also available.) - More advanced version of the beverage can exercise with an experimental analysis of stress based on measurements with strain gage rosettes. Application of the various failure criteria to the results. Details for measuring the elastic modulus of thin can material. (See also Issue 1. ) To request a copy of this issue, contact the Educational Program Coordinator.