PASCO's compact Stress/Strain Apparatus shows the stress and strain during the entire process of stretching and breaking a material. The sample is stretched by turning the knob by hand until the sample breaks. The force used to stretch the sample is measured using a Force sensor. Calculate both the stress and the change in length of the sample using a both PASCO Interface and Software.
Three forms of the Stress/Strain Apparatus are available:
PASPORT sensors connect directly to all current PASCO interfaces.
ScienceWorkshop sensors connect directly to the 550 and 850 Universal Interfaces as well as legacy ScienceWorkshop interfaces. They can connect to other PASCO interfaces with the use of an adapter. More info.
Stress/Strain Apparatus (PASPORT)
Stress/Strain Apparatus (ScienceWorkshop)
Stress/Strain Apparatus (without sensors)
|Rotary Motion Sensor|
|Economy Force Sensor|
|PASPORT Rotary Motion Sensor|
|PASPORT Force Sensor|
|Stress Strain Apparatus Coupons - Plastic|
|Stress Strain Apparatus Coupons - Metal|
At the heart of the Stress/Strain Apparatus is a high quality hand crank that allows the user to generate the force needed to stretch and ultimately break the provided test coupons of different materials.
In order to accurately measure the forces involved a force sensor is used. However, it's limit is 50 N, a number easily surpassed by the forces needed to break some of the materials. That's why the Stress/Strain Apparatus employs a metal bar with a 5:1 mechanical advantage, increasing the maximum force that the sensor can read to 250 N.
A drive belt connects the hand crank to a rotary motion sensor which translates the turn of the crank into the corresponding change in length of the sample. Either PASPORT or Science Workshop sensors may be used with the Stress/Strain Apparatus.
Tension is applied to the sample by turning the knob by hand until the sample breaks. The force used to stretch the sample is measured using a Force Sensor connected to a PASCO Interface. A metal lever provides a five-to-one mechanical advantage, increasing the maximum force that the sensor can read to 250 N.
The stress is calculated using Capstone or SPARKvue software by taking the force over the cross-sectional area. No adjustment is made for any change in the cross-sectional area during stretching.
The change in length of the sample is measured using a Rotary Motion Sensor. The resolution is 0.007 mm. The strain is calculated by dividing the change in length by the original length.
The software automatically calculates stress by dividing the applied force by the cross-sectional area and the strain by dividing the change in length by the original length. Data points are taken continuously creating a graph in real time. A linear curve fit of the initial straight line provides Young's Modulus while integrating under the curve determines the material's toughness.
The Stress/Strain Apparatus is mounted on a rugged aluminum plate.
|Product Name||Part Number||Price||Qty.||Select|
|Stress Strain Apparatus Coupons - Plastic||AP-8222||
|Stress Strain Apparatus Coupons - Metal||AP-8223||
|Replacement Test Coupons (Full Set)||AP-8217A||
This apparatus requires an interface in order to connect the two sensors simultaneously.
This apparatus requires a Universal Interface in order to connect the two sensors simultaneously.
U.S. Educator Pricing Only