At the invitation of our college, Associate Professor Qian Xudong from the National University of Singapore (NUS) delivered an academic lecture titled Contactless Approach for J-R Curve Measurement in Monotonic and Dynamic Tests in the Lecture Hall of the Comprehensive Building on Xiaozhai Campus on the morning of November 3, 2023. The lecture was hosted by Associate Professor Liao Fangfang from the School of Civil Engineering, and a number of teachers (including Associate Professor Lei Tuo) as well as more than 20 postgraduate students from the School of Civil Engineering attended the event.
Quantifying the fracture resistance of fractured specimens typically requires measuring two key parameters: the fracture resistance characterized by energy release rate, and crack growth measured via the compliance method. During the lecture, Associate Professor Qian Xudong shared the latest progress in measuring fracture resistance curves through contactless methods—specifically the digital image correlation (DIC) method, which is commonly used for thin specimens. This lecture also introduced approaches to extend the DIC method to thick specimens, side-grooved specimens, and specimens subjected t dynamic loads. By solely utilizing the surface displacement of specimens measured via DIC, this method enables consistent measurements of J-integral and crack growth, facilitating direct comparisons of fracture toughness under different strain rates.
