Biomechnics -1
Stress-Strain
Equipment
Included:
1
Stress-Strain Apparatus
AP-8214A
1
Force Sensor
PS-2104
1
Rotary Motion Sensor
PS-2120
1
Calipers
SF-8711
Required but Not Included:
1
850 Universal Interface
UI-5000
1
PASCO Capstone Software
UI-5400
Introduction
The objective of this lab is to find the relationship between tensile stress and strain for various materials. The Stress-Strain Apparatus stretches (and in some cases breaks) a test coupon while it measures the amount of stretch and force experienced by the test coupon. Software is used to generate a plot of stress versus strain, which allows Young's Modulus, the elastic region, the plastic region, the yield point, and the break point to be ascertained.
Theory
The ratio of the force (F) applied to the cross-sectional area (A) of a material is called the stress: (1)
The ratio of the change in length (L) to the original length (Lo) of a material is called the strain: (2)
In the elastic region, the stress is proportional to the strain and the proportionality constant is called Young’s Modulus, Y. (3)
Set-Up
Figure . Stress/Strain Apparatus Assembly
1. Open the PASCO Capstone software on the computer.
2. Connect the Stress/Strain apparatus to the computer using USB cable and the PASCO Capstone software will automatically recognize the device.
3. Make a calculation for the stretch. For every 360o turn of the Rotary Motion Sensor, the screw moves 1 mm, so the stretch, x, in mm is given by
x = [position in radian]/ 2*π (4)
Calibration (Not required)
During the experiment, as the crank turns, force will be applied to the test coupon, causing it to stretch. However, this force will also cause the apparatus platform and the Force Sensor to bend. The displacement registered by the Rotary Motion Sensor will be the combination of the coupon stretching and the rest of the apparatus bending. Regardless of how much the coupon stretches, the
Equipment
Included:
1
Stress-Strain Apparatus
AP-8214A
1
Force Sensor
PS-2104
1
Rotary Motion Sensor
PS-2120
1
Calipers
SF-8711
Required but Not Included:
1
850 Universal Interface
UI-5000
1
PASCO Capstone Software
UI-5400
Introduction
The objective of this lab is to find the relationship between tensile stress and strain for various materials. The Stress-Strain Apparatus stretches (and in some cases breaks) a test coupon while it measures the amount of stretch and force experienced by the test coupon. Software is used to generate a plot of stress versus strain, which allows Young's Modulus, the elastic region, the plastic region, the yield point, and the break point to be ascertained.
Theory
The ratio of the force (F) applied to the cross-sectional area (A) of a material is called the stress: (1)
The ratio of the change in length (L) to the original length (Lo) of a material is called the strain: (2)
In the elastic region, the stress is proportional to the strain and the proportionality constant is called Young’s Modulus, Y. (3)
Set-Up
Figure . Stress/Strain Apparatus Assembly
1. Open the PASCO Capstone software on the computer.
2. Connect the Stress/Strain apparatus to the computer using USB cable and the PASCO Capstone software will automatically recognize the device.
3. Make a calculation for the stretch. For every 360o turn of the Rotary Motion Sensor, the screw moves 1 mm, so the stretch, x, in mm is given by
x = [position in radian]/ 2*π (4)
Calibration (Not required)
During the experiment, as the crank turns, force will be applied to the test coupon, causing it to stretch. However, this force will also cause the apparatus platform and the Force Sensor to bend. The displacement registered by the Rotary Motion Sensor will be the combination of the coupon stretching and the rest of the apparatus bending. Regardless of how much the coupon stretches, the