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  Engineering Mechanics and machi

  Strain Gauge Training System

  Strain gauges are used extensively in sensor systems to detect forces, moments and deformations. The FL 100 experimentation system provides a comprehensive introduction to the fundamentals of strain gauges. Three test specimens for tension, bending and torsion are each fitted with three strain gauges. The strain gauges are wired into a full bridge configuration. A defined load is generated with the aid of weights, and the elongations can then be recorded. The specimens under test can be inserted quickly and precisely into the mounting frame. The strain gauge application area is protected by a Plexiglas cover, which also makes it clearly visible for inspection purposes. The measuring amplifier unit delivers the bridge supply voltage, and displays the load-dependent output voltage. The digital display is programmable, to provide readouts conforming to the variables being measured. It also features a tare function to exclude the influence of preloads. All detachable test components are clearly laid-out and well-protected inside a storage box.
  The well-structured instructional material outlines the technological fundamentals and provides a step-by-step guide through the experiments.

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  Engineering Mechanics and machi

  Experimental Set Redundant Truss

  This set for use with the universal test frame enables the distribution of forces in redundant trusses to be investigated. Due to the range of different fixed length members, numerous plane trusses can be assembled. These are made redundant by the insertion of an additional member of variable length. All members are equipped with full bridge strain gauges. The measuring amplifier is required to display the forces in the members and to further process the measured values on a PC. A set of cables to connect strain gauges and the amplifier is included. The trusses can be loaded using a spindle drive with a ring dynamometer and strain gauge.

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  Engineering Mechanics and machi

  Experimental Set Virtual Work

  Using this experimental set the deformation of a loaded bending bar by forces and moments is considered using the principle of virtual work. The set is intended for use with the universal testing frame . The set contains a test bar that can be clamped at both ends. In this way statically defined or undefined cases can be investigated as required. Forces or moments can be applied at any position, this feature permits different load cases to be investigated. For the determination of forces and deformation mech. dial gauges are used. An additional bearing with a dynamometer is used for the direct measurement of forces on the bar.

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  Engineering Mechanics and machi

  Transmitted Light Polariscope

  Using this transmitted light polariscope, photoelastic experiments can be performed. This process exploits the fact that the refractive index of photoelastically sensitive materials changes under mechanical stress. Transmitted polarised light experiences a rotation of its plane of polarisation, this results in lines in the material subject to the same stress being of the same colour. The distribution of the stress in the model can thus be clearly seen. The polariscope can either generate coloured stress diagrams using white light or, using monochromatic light, light-dark diagrams. The filters, which have angular scales, can be rotated in a holder mounted on rollers. On the side is a pointer using which the angular position can be read off. Light sources, polarisation filters and load frames are separate components on this unit. Thus it is possible to realise flexible experimental set-ups also with own models.