This compact Stress/Strain Apparatus shows the stress and strain during the entire process of stretching and breaking a material. PASCO has scaled-down the typically expensive engineering devices so that this apparatus is able to do all the physics without the high cost of a materials testing machine.
Since the Stress/Strain Apparatus shows the entire stress versus strain curve, it is possible to measure a wide range of material properties including Young's Modulus, the yield strength, tensile strength, ductility and toughness of the material. In addition, the different curve shapes for different materials can be compared.
PASCO Capstone software allows students to determine Young's Modulus by measuring the slope of the initial straight line (the elastic region) and to determine the toughness by integrating under the curve.
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 PASPORT 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 DataStudio 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 using DataStudio by dividing the change in length by the original length.
This apparatus requires an interface in order to connect the two sensors simultaneously.
|Stress Strain Apparatus Coupons - Plastic||AP-8222||
|Stress Strain Apparatus Coupons - Metal||AP-8223||
This product requires or recommends PASCO Capstone for data collection and analysis.