The DELTALAB EX150 tensile-deflection bench is the basis for a series of material resistance experiments. In its standard configuration, this bench allows the study of traction and simple bending with conventional measuring instruments: comparators. Two comparators are used for lengthening and deformation measurements of the specimens; a third to the determination of the force applied to the test pieces during the tests. To complete these global observations, tensile and flexural specimens equipped with strain gauges are proposed to check the distribution of deformations according to the section and the length of these simple structures. The experiments are directly feasible and exploitable with the DELTALAB EI616 6-channel extensometric bridge The use of these instrumented specimens led us to the design and development of displacement sensors with strain gauges to replace the comparators. These elements have enabled the realization of a computerized data acquisition and processing system EX151 which, beyond the purpose of these experiments designed to give students the physical sense of elasticity of materials and resistance mechanical structures, introduces the use of computers in the experiment. This tool brings flexibility and speed while waiting to bring theory and manipulation closer together.
The user can easily interchange the displacement sensors and comparators to change his bench to the instrumented version or return to the basic version knowing that there is no consequence on the observed physical phenomena. data acquisition and processing EX151 was designed for pc, from the fully instrumented EX150 bench.
It consists of a material part :
The software allows as before the following studies
Configuration 1 : the study of the stiffness of specimens.
Configuration 2 : the study of the distribution of the deformations according to the force applied.