The Strain Gauge. James K Beard, Ph.D. Rowan Hall Auditorium November 2, 2006
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1 The Strain Gauge James K Beard, Ph.D. Rowan Hall Auditorium beard@rowan.edu November 2, 2006
2 What is Strain? Strain is elongation or deformation of a solid body due to forces applied to it Physical units of strain or delta length over length Practical units of strain for stretching or compression stress is microstrains, or parts per million of elongation Compression is denoted by negative strain Slide 2
3 What is a Strain Gauge? Uses resistance of magnet wire Resistance increases as it stretches Resistance of a medium: 2 σ Length σ Length R0 = = Area Volume If the volume stays constant as the wire is stretched an incremental amount δl, the resistance increases Slide 3
4 Resistance vs. Stretching Resistance increases as it stretches σ ( Length + δl) R = Area σ + Area ( 2 Length 2 Length δ L) δ L = 1+ 2 R Length 2 0 Slide 4
5 The Gauge Factor Actual strain gauge resistance is δ L R = 1+ K R Length The factor K is the gauge factor Theoretical value is 2 Actual value can vary due to Physics of stretching Temperature Backing, adhesive Small differences during manufacturing Calibration of the gauge factor is necessary for best accuracy 0 Slide 5
6 Practical Aspects of Strain Gauge Configuration Requirements Must easy to apply to material Must be easy to use Must have minimal effect on the strain being measured Configuration Make very small Physically weak compared to most materials Satisfy ease of application and minimal effect on strain Use folded configuration instead of straight wire Keep total strain gauge size small Measure the strain over a small area Addresses all three requirements Slide 6
7 How Strain Gauges are Used Apply so that strain-measuring wires are in the direction of the strain being measured Connect the strain gauge in a Wheatstone bridge circuit Measure the differential resistance Convert the differential resistance to strain for recording the measurement Slide 7
8 Slide 8
9 The P-3500 Strain Indicator Slide 9
10 Usage of the P-3500 We have two for Sophomore Clinic Use will be under supervision of a faculty member Today we present strain gauges and the P-3500 How a strain indicator works How they are hooked to the P-3500 How the P-3500 is used Slide 10
11 What the Strain Indicator Is Battery-powered Electronics to Put the strain gauge in a Wheatstone bridge Balance the bridge for zero strain Measure the output of the Wheatstone bridge Calibrate a four-digit display to read strain in microstrains Provide a ground-referenced analog output Slide 11
12 Slide 12
13 How a Strain Gauge Indicator Works Provides a Wheatstone bridge Resistance is the nominal resistance of the strain gauge One of the other resistors is varied to balance the bridge for zero strain A differential amplifier captures the output of the Wheatstone bridge A variable gain calibrates the output to microstrains A display provides recordable data in microstrains An analog output provides data for oscilloscopes, data loggers, or other purposes Slide 13
14 Strain Indicator Regulated Voltage Strain Gauge Factor Strain Strain Gauge Wheatstone Bridge Calibrated Amplifier Display Balance Analog Output Slide 14
15 Wheatstone Bridge Regulated Voltage Strain Gauge Zeroing Adjustment Output Slide 15
16 Differential Amplifier e R G + - R R R R R - e + 2 R + Gain = 1+ ( e e ) - + R R G e Out + Slide 16
17 How to Operate Instructions on the inside of the lid We use four buttons Power off Zero amp Gage factor Run Slide 17
18 Slide 18
19 Slide 19
20 Slide 20
21 The Strain Gauge Slide 21
22 Slide 22
23 In Use Slide 23
24 For the Hoistinator Carefully select a spar for instrumentation Carefully select a point on the spar for a strain gauge Attach a strain gauge to the spar Relate measured strain to spar performance Strain versus load Failure strength Failure load Relate measured strain to Hoistinator performance Maximum safe load Failure load REMEMBER ENGINEERING SAFETY MARGINS Slide 24
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