Investigation of Mechanical Properties and Fracture Simulation of Solution-Treated AA 5754
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JMEPEG DOI: 10.1007/s11665-017-2802-8
Investigation of Mechanical Properties and Fracture Simulation of Solution-Treated AA 5754 Pankaj Kumar and Akhilendra Singh (Submitted November 14, 2016; in revised form May 14, 2017) In this work, mechanical properties and fracture toughness of as-received and solution-treated aluminum alloy 5754 (AA 5754) are experimentally evaluated. Solution heat treatment of the alloy is performed at 530 °C for 2 h, and then, quenching is done in water. Yield strength, ultimate tensile strength, impact toughness, hardness, fatigue life, brittle fracture toughness ðKIc Þ and ductile fracture toughness ðJIc Þ are evaluated for as-received and solution-treated alloy. Extended finite element method has been used for the simulation of tensile and fracture behavior of material. Heaviside function and asymptotic crack tip enrichment functions are used for modelling of the crack in the geometry. Ramberg-Osgood material model coupled with fracture energy is used to simulate the crack propagation. Fracture surfaces obtained from various mechanical tests are characterized by scanning electron microscopy. Keywords
aluminum alloy 5754, failure analysis, solution heat treatment, XFEM modeling
1. Introduction The non-heat treatable Al-Mg alloys are commonly used in components of aircrafts, ship buildings, automobile, propeller fans and many more. Al-Mg alloys are light weight, moderate strength alloys and possess excellent corrosion resistance, weldability and ductility. These properties are useful for applications in automobiles, cryogenics and structural members. The presence of Mg in the aluminum makes these alloys highly resistive to corrosion; therefore, Al-Mg alloys can be an appropriate choice for marine and cryogenic applications. In marine and cryogenic applications, the components are subjected to dynamic loading. Therefore, it is important to study the mechanical and fracture behavior of the materials used in these applications. The components subjected to cyclic loading eventually fail due to crack initiation near inclusions or secondphase particles. In this work, a relatively new aluminum alloy (AA 5754) has been selected to investigate its mechanical and fracture behavior. Solution heat treatment is widely used to improve the mechanical properties of Al alloys. The strengthening mechanism in Al-Mg alloys by solution heat treatment process (SHT) is carried out below the melting point of the alloy (Ref 1, 2). Various studies related to solution treatment of Al-Mg alloys have been reported in the literature. Authors performed annealing on AA 5052 alloy at 300 °C for 90 min followed by rolling and cryorolling (Ref 3). On similar pattern, the effect of annealing and rolling process on the mechanical properties of Al 5083 was also studied (Ref 4). Prior to rolling, annealing is performed at 540 °C for 2 h. Singh et al. Pankaj Kumar and Akhilendra Singh, Department of Mechanical Engineering, Indian Institute of Technology, Patna, India. Contact e-mail: [email protected].
Journal of Materials Eng
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