Experimental evaluation of fracture properties of aluminum alloy 1050-H14 by small punch test

Article type: Research Article

Authors: Doan, The Yen^a | Pham, Hang Thi^a; | Le, Khai Quang^b | Nguyen, Thi-Hang-Nga^a | Van Nghiem, Vinh^a

Affiliations: [a] Faculty of Mechanical Engineering, Thuyloi University, Hanoi, Vietnam | [b] Faculty of Civil Engineering, Thuyloi University, Hanoi, Vietnam

Correspondence: [*] Corresponding author: Hang Thi Pham. E-mail: pthang@tlu.edu.vn

Abstract: Although ductile fracture properties of aluminum alloy have been examined by several research works, the effect of strain rate in small punch test is still unclear. An investigation on rate sensitivity of fracture mechanical characteristics of aluminum alloy in small punch test is necessary. In the present study, an experimental investigation of small punch test is performed at different deformation rate in quasi-static test for aluminum alloy 1050-H14. The strain-rate sensitivity of fracture properties are discussed based on the force-deflection curve as well as observation of fracture surface of deformed specimen after testing. The obtained results show that the material possesses a positive rate-sensitivity in the investigated range of displacement rate from 0.48 to 1.26 mm/min. The necking appears in a small region due to inhomogeneous deformation in the direction of cross-section at lower deformation rate. In the case of higher rate of deformation, more uniform deformation in the direction of cross-section and the local ductile fracture with more dimples can be observed.

Keywords: Aluminum alloy, fracture properties, small punch test, strain rate sensitivity

DOI: 10.3233/SFC-230003

Journal: Strength, Fracture and Complexity, vol. 16, no. 1, pp. 61-72, 2023