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TM 262 Hertzian Contact Apparatus
Education / GUNT Hamburg / Engineering Mechanics and Machine Elements / Fundamentals of Engineering Design /

This portable unit demonstrates the characteristics of the contact area in the case of Hertzian contact.


A pressure pad made of rubber is pressed against a transparent plastic plate using a lever. Plate and pressure pad are convex. In this way both circular and also elliptical contact areas can be generated.


The force on the lever is measured with the aid of a spring balance and the contact area is measured. This can be clearly seen as it is illuminated from the side by a halogen lamp.


Learning Objectives / Experiments

- Characteristics of the contact area on point contact with varying contour radii

- Characteristics of the contact area as a function of the contact force

- Influence of an additional transverse component in the contact force


[1] Benctop experiment for demonstrating Hertzian contact
[2] Pressure pad made of silicone rubber
[3] Transparent plastic pressure plate
[4] Dynamometer spring balance

[5] Sliding device for spring balance to allow continuously adjustable contact force

[6] Optimal illumination of the contact area using halogen light from the side
[7] Sturdy metal chassis with rubber feet

Technical Data

Spring balance

- 0...25N, graduations: 0.5N

Pressure pad: 60 Shore

Halogen lamp

- voltage: 12V

- power: 20W


Dimensions and Weight
l x w x h : 400 x 400 x 530 mm
Weight : approx. 16 kg
Required for Operation
230V, 50/60Hz, 1 phase
Scope of Delivery
1 complete experimental apparatus
1 instruction manual
Order Details
040.26200  TM 262  Hertzian Contact Apparatus