Compare the ten values of strain obtained while loading the beam to those obtained during unloading. Discuss why differences may have occurred. Are these differences acceptable?

The design of components for many engineering systems is based on the application of

theoretical models. The accuracy of these models can be verified through testing. One way of

validating a math model is to use a strain Gage measurement system to measure the strain at the

surface of a structure. The sensor used to transfer a mechanical strain to a quantifiable output is

the strain Gage. The strain Gage has a resistance which changes as a function of mechanical

strain. Although the change in resistance can be quantified using an ohm meter, signal

conditioning is used to convert the change in resistance to a voltage. The voltage may then be

amplified, thus reducing quantization errors. The relationship between the input strain and the

output voltage may be determined using the system sensitivity.