PSI - Issue 32

A.V. Churkin et al. / Procedia Structural Integrity 32 (2021) 273–276 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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The hardware configuration of the measurement modules is configured individually for each module in the ZETLAB software package [3]. When constructing the control circuit and the driver of the HBS 57 stepper motor (Fig. 2), the following values were taken: the refresh rate - 50 Hz, the unit of measurement – “step”, the number of pulses per step – 1, the number of steps per revolution – 800. The storage of such primary information in the memory of the control module reduces the number of parameters used by the software developer of the automated workplace of the stand operator.

Fig. 2. Functional circuit of test bench

The data acquisition system is based on the digital module ZET 7160-e for recording changes in the linear dimensions of the test sample and the digital module ZET 7111 for dynamic strain measurement of loading parameters. At the output of the primary converter E6B2-CWZ6C, a signal proportional to the deformation parameter of the test sample is generated, which is processed by the digital meter ZET 7160-E and transmitted via the CAN bus via the interface module ZET 7176 to the control program of the diagnostic stand. A strain gauge CM ( DACELL ) sensor with a nominal measuring range of 3 t.s. was used as the primary load force converter for assessing the strength characteristics of metal samples with a diameter of 2-3 mm and a length of 4-6 mm. The digital module ZET 7111 provides power to the sensor, registration of its primary signal, processing of the latter and transmission of the processed data through the interface module to the installation control program. The replacement of the primary CM load force converter (DACELL) with a similar strain gauge with a nominal range of 1 t.s. made it possible to implement a method for testing composite materials and polymer reinforcement [5] without additional software modification. Thus, the functionality of the installation allows you to analyze the strength characteristics of materials in two nominal measurement ranges up to 3 t. s. and up to 1 t. s. without losing the accuracy and quality of measurements. 3. Conclusions The diagnostic stand for uniaxial compression of small samples is built using the ZETLAB and ZETView hardware and software complex, modular architecture and digital devices of the ZETSENSOR series. The functional capabilities of the unit allow analyzing the strength characteristics of materials in two nominal measurement ranges up to 3 t. s. and up to 1 t. s. without losing the accuracy and quality of measurements. The advantage of the developed installation is the autonomous configuration of the modules when connecting the primary converters, their easy installation and disassembly, light indication of their current state, which facilitates the diagnosis of measurement and control subsystems at the control object. The modular architecture of the diagnostic stand allows you to expand the functional content of subsystems to solve new measurement problems.