Analysis of a Strain Gage Rosette Union College（分析应变计玫瑰联合学院）.pdfVIP

Calculating Principal Strains using a Rectangular Strain Gage Rosette Strain gage rosettes are used often in engineering practice to determine strain states at specific points on a structure. Figure 1 illustrates three commonly used strain gage rosette configurations. Each of these configurations is designed with a specific task in mind. The far right rosette in Figure 1 is referred to as a tee rosette. Tee rosettes are two Figure 1: Examples of common element rosettes and should only be used when the Strain gage Rosettes encountered in principal strain directions are known in engineering practice. advance from other considerations. The middle rosette in Figure 1 is referred to as a c 45° rectangular rosette and the far left as a delta rosette. These three element rosettes are used b in applications where the principal strains are unknown. There are many other parameters that need to be taken into consideration when 45° choosing a strain gage. Literature from manufacturers of strain gages provides some guidance in choosing the proper strain gage for a given application. loop The primary focus of this treatise is the a rectangular rosette. Figure 2 illustrates the numbering sequence and geometry that will Figure 2: Illustration of the orientation of the be used in the following discussion. Figure rectangular strain gage rosette being evaluated in 3 shows an actual rectangular strain gage this example. rosette installed on a structure with the lead wires soldered onto the terminal tabs.