Inverse Characterization of Material Constitutive Parameters for Dynamic Applications. (2015)

• Record Type: Journal Article
• Authors: Oliveira, Inês; Teixeira, Pedro; Ferreira, Fernando; Reis, Ana
• Is Part Of: Procedia engineering. Volume 114(2015)
• Page Start: 784
• Page End: 791
• Publication Date: 2015
• Subjects: Hopkinson bar -- High strain rate -- Aluminum AA5182 -- Constitutive modeling -- Finite element optimization; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2015.08.027
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: Accurate modelling of mechanical dynamic behavior is a prerequisite for an effective analysis of both manufacturing processes and dynamic load during service life of the components. Consequently, precise and reliable rate dependent constitutive models, and related parameters, are required to represent the plasticbehavior of metals undergoing high-strain rate deformations. However, these parameters are not always directly measurable. This study presents an inverse methodology to identify the dynamic properties of metallic materials by using the Split Hopkinson pressure bar. First, a symmetric finite element model for the simulation of SHPB test was implemented into ABAQUS/Explicitsoftware. An inverse analysis methodology was then established, enabling the determination of the material parameters for the Johnson-Cook constitutive law. A user defined objective function was used to measure the optimality of the parameters, by evaluating the error between numerical and experimental results of SHPB test, namely the elastic strain wave's evolution with time. The minimization of the objective function with respect to the material parameters was accomplished using the Levenberg–Marquardt optimization algorithm.