TAILIEUCHUNG - Rules of Thumb for Mechanical Engineers 2010 Part 16

Tham khảo tài liệu 'rules of thumb for mechanical engineers 2010 part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | For 350 Q gauges GF u y Strain in each element 500 pe 1 R R and vin 12 Then R y V and v 2 lt R. V and 2 4 V - v2 mV Figure 11. Wheatstone wiring diagram for beam in bending calculations for beam in Figure 12. Full Wheatstone Bridge Compensation Techniques If the beam in Figure 10 is to be used at elevated or reduced temperatures further compensation for apparent strain Eapp and modulus may be used to optimize the data for the customer. Apparent strain compensation helps account for strain output resulting from no-load temperature excursions. These extraneous readings are caused by 1 temperature coefficient of resistance TCR changes in the gauges and wiring of the bridge and 2 differences in thermal expansion between the component being instrumented and the gauge itself. Modulus compensation attempts to account for additional extraneous strain output at temperature caused by both changes in the strain sensor s gauge factor GF with temperature and changes in component modulus of elasticity E allowing the data to represent only the sừain due to load. This last compensation allows the design engineer to use the data without having to know specific time-temperature history to input varying E and GF values to get true stress. As further clarification of this compensation issue it may be viewed as follows If the part can be taken through a temperature excursion in a no-load condition and the gauge output remains essentially zero then the gauge requires no further eapp compensation. If the part can be taken through a temperature excursion under load and the gauge output represents accurately the load conditions in Instrumentation 365 dependent of temperature then the sensor requires no further modulus compensation. Apparent strain can be corrected by 1 using the coưect STC self temperature compensating gauges 2 compensating with the addition of special wừe segments or trimmable bondable foil patterns within the bridge itself or 3

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