Experimental Study on the Size Effect of Dynamic Compression Properties of Steel-PE Hybrid Fiber Cement-based Composites
ZHAO Bo1, LI Liang1,*, WANG Zichen1, WU Jun2, DU Xiuli1
1 Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Ministry of Education, Beijing 100124, China; 2 School of Civil Engineering, Shanghai Normal University, Shanghai 201418, China
Abstract: Dynamic compression tests on steel-polyethylene hybrid fiber cement-based composites(S/PE-ECC) were performed using a split Hopkinson pressure bar(SHPB). And then compared the test results of two specimen sizes, Ф50 mm×25 mm and Ф70 mm×35 mm, focusing on failure modes, dynamic compressive strength, peak strain, and pre-peak stress toughness to investigate the size effect on S/PE-ECC. The results reveal that, under similar strain rates, the failure modes and failure severity in both sizes of S/PE-ECC specimens are generally comparable, with no significant size effect observed. The Ф50 mm×25 mm specimens exhibit higher peak stress and toughness compared to the Ф70 mm×35 mm specimens, demonstrating a noticeable size effect. The inclusion of fibers reduces the size effect on the dynamic peak strength and toughness of cement-based materials. Although the size effect on dynamic peak strain does not follow a clear pattern, reducing the specimen size amplifies the strain rate effect on strain.
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2026, Vol. 40 
