Dynamic behavior of geometrically complex hybrid composite samples in a Split-Hopkinson Pressure Bar system

20th Chemnitz Seminar on Materials Engineering - 20. Werkstofftechnisches Kolloquium

Pouya, M.^1 ; Balasubramaniam, S.^1,2 ; S., Sharafiev ; M.F.-X., Wagner

Technische Universität Chemnitz, Institute of Materials Science and Engineering, Chemnitz

09125, Germany^1

Technische Universität Chemnitz, Department of Electrical Engineering and Information Technology, Chemnitz

09126, Germany^2

关键词: Explicit finite elements;    Geometry effects;    High strain rate deformation;    Interfacial failures;    Material variation;    Mechanical behavior;    Split hopkinson pressure bar techniques;    Split Hopkinson pressure bars;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/373/1/012025/pdf
DOI  :  10.1088/1757-899X/373/1/012025

来源: IOP

【 摘 要 】

The interfaces between layered materials play an important role for the overall mechanical behavior of hybrid composites, particularly during dynamic loading. Moreover, in complex-shaped composites, interfacial failure is strongly affected by the geometry and size of these contact interfaces. As preliminary work for the design of a novel sample geometry that allows to analyze wave reflection phenomena at the interfaces of such materials, a series of experiments using a Split-Hopkinson Pressure Bar technique was performed on five different sample geometries made of a monomaterial steel. A complementary explicit finite element model of the Split-Hopkinson Pressure Bar system was developed and the same sample geometries were studied numerically. The simulated input, reflected and transmitted elastic wave pulses were analyzed for the different sample geometries and were found to agree well with the experimental results. Additional simulations using different composite layers of steel and aluminum (with the same sample geometries) were performed to investigate the effect of material variation on the propagated wave pulses. The numerical results show that the reflected and transmitted wave pulses systematically depend on the sample geometry, and that elastic wave pulse propagation is affected by the properties of individual material layers.