Rafayel Ghasabyan | Searcharxiv

arXiv2025

Real Time Fatigue Crack Growth Monitoring Using High Precision Control and Data Acquisition Systems

Fatigue cracks may initiate and propagate long before a structural component reaches the end of its nominal life. Detecting and quantifying crack growth in real time is critical for avoiding catastrophic failures in aerospace structures, nuclear reactors and civil infrastructure. This research reviews four widely used crack growth monitoring techniques: digital image correlation (DIC), acoustic emission (AE), compliance based methods and direct current potential drop (DCPD). The research evaluates their working principles, instrumentation, detection thresholds, noise sensitivities and suitability under various environmental conditions. Recent advances in high precision control and data acquisition systems (DAQs) that enable multi sensor data fusion are explored. The goal is to guide selection and integration of monitoring methods in modern structural health monitoring architectures.

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arXiv2025

FPGA-Based Material Testing Machine Controller

In the realm of contemporary materials testing, the demand for scalability, adaptability, parallelism, and speed has surged due to the proliferation of diverse materials and testing standards. Traditional controller-based systems often fall short in meeting these requirements, resulting in adaptability and processing speed limitations. Conversely, FPGA-based controllers present a multifaceted, high-performance solution. Key advantages of FPGA-based controllers in materials testing encompass reconfiguration capabilities for cost-effective adaptation to evolving materials and standards. FPGAs also enable the integration of parallel control and data acquisition circuits, vital for multichannel test equipment demanding simultaneous, independent operation of multiple control channels.

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