demonstration of the contact area under Hertzian pressure
- When two bodies with a convex surface are pressed against each other, ideally, these bodies only come into contact linearly or at one or more points.
- In the real world, as the two bodies approach each other, an elliptical contact area occurs at the contact point due to deformation.
- In this case, the compressive stresses (compression) are proportionally distributed to the deformations.
- Heinrich Hertz, a physicist, developed a theory to calculate the largest pressure, also known as Hertzian pressure.
- The size and shape of the contact areas and the extent and distribution of the mechanical stresses under the contact areas can also be calculated.
- The TM 262experimental unit demonstrates the shape of the occurring contact area under Hertzian pressure as an example.
- A rubber pressure pad is pressed against a transparent plastic plate via a lever.
- The plate and pressure pad are curved.
- Both circular and elliptical contact areas can be generated.
- Using a spring balance, the force is measured at the lever and the contact force is determined.
- A halogen lamp at one side perfectly illuminates the contact area.
- Grid lines on the plastic plate make it easier to measure the contact area.
- demonstration of Hertzian pressure
- silicone rubber pressure pad
- transparent plastic plate with grid lines makes it easier to measure the contact area
- spring scale to measure force
- movable device for the spring balance to generate a continuously adjustable contact force
- optimum illumination of the contact area by side-mounted halogen lamp
- Spring balance:
- graduation: 0,5N
- Pressure pad:
- 60 Shore
- Halogen lamp:
- voltage: 12V
- power: 20W
- 230V, 50Hz, 1 phase
- 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
- L/CSA optional
Dimensions & Weight:
- L x W x H: 400x400x530mm
- Weight: approx. 16kg
- resulting shape of the contact area under point contact with different radii of curvature
- shape of the contact area as a function of the contact force
- influence of an additional transverse component of the contact force
Scope of delivery:
- 1 experimental unit
- 1 spring balance
- 1 halogen lamp
- 1 set of instructional material
- demonstration of the contact area under Hertzian pressure
- generation of circular or elliptical contact areas
- especially clear results due to pairing transparent plastic with silicone rubber
- Optional: WP 300.09 Laboratory trolley
Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.