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?

Explanation:

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.

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