A high-speed tensile facility ͑HSTF͒ invented by us was applied to interrupting the tests for pure copper specimen bars controlled locally at different levels of elongation. It was realized to isolate and identify the different stages of the dynamic fracture process of the pure copper specimen bar under impact tension. The results of scanning electron microscopical ͑SEM͒ investigation of the recovered pure copper specimens show that the void evolution near the surface of the minimum cross-section of the necking area is more severe than that at the middle of the necking area, which may be connected with the findings discussed by Alves and Jones ͓J. Mech. Phys. Solids 47, 643 ͑1999͔͒. The constitutive models in a certain range of strain determined from the tensile split Hopkinson bar optimized by us were employed and adjusted in numerically simulating the large deformation of the pure copper specimen in the interrupted tensile tests on HSTF. The dependence of the instability strain of thermoviscoplastic materials in simple tension on material parameters delineated by Batra and Wei ͓Int. J. Impact Eng. 34, 448 ͑2007͔͒ was inspected in predicting the diffuse necking of the specimen bar. The axisymmetric necking rod model with a central void under static tension presented by Ragab ͓Eng. Fract. Mech. 71, 1515 ͑2004͔͒ was extended to predicting the local necking and fracture of the specimen bar under impact tension.
Articles you may be interested inEffect of temperature, strain, and strain rate on the flow stress of aluminum under shock-wave compression J. Appl. Phys. 112, 073504 (2012); 10.1063/1.4755792 High strength and high electrical conductivity in bulk nanograined Cu embedded with nanoscale twins Appl. Phys. Lett. 91, 211901 (2007); 10.1063/1.2816126 High-strain rate testing of HMX-based explosive AIP Conf.Shock profile studies on selected silicon carbide ceramics with application to dynamic yield mechanisms AIP Conf.It is indicated that the constitutive relations for shear modulus G as functions of thermodynamic state were not given in the Johnson-Cook model and the Zerilli-Armstrong model while the constitutive relations for yield strength Y as functions of strain and strain rate were not given in the Wallace model and the Straub model. Seven constitutive models are constructed based on Y / G = constant and on G / B = constant ͑B-bulk modulus͒, respectively. The variations of longitudinal stress, transverse stress, and yield strength of oxygen-free high-conductive ͑OFHC͒ copper with time under planar shock loading are obtained using the manganin stress gauges and compared with the predicted results by the constructed seven constitutive models. It seems that the pressure, density, temperature, and plastic strain dependence of the yield strength for OFHC copper subjected to planar shock loading is essential to the constitutive description. Planar spall tests for OFHC copper are also performed and the void coalescence-based spall model presented by the authors are applied to numerical simulations of planar spall tests including tests given by Seaman et al. ͓Phys.Rep. 147, 253 ͑1987͔͒. The Steinberg-Cochran-Guinan constitutive model is proved appropriate to the planar shock loading and is adopted in the numerical simulations of planar spall tests.
A series of tensile tests for pure copper sheets containing drilled holes of multi-configurations are carried out on a tensile split Hopkinson bar (TSHB) at a range of tensile velocities. The dynamic growth and coalescence of drilled voids were recorded by a high-speed camera. The results of scanning electron microscopical (SEM) investigation of microvoid evolution at edges of ruptured zones between drilled voids in recovered sheets show void coalescence mechanisms, which are similar to evolution of visualized drilled voids. The experimentally recovered and high-speed camera recorded evolution of drilled voids in pure copper sheets are compared with the numerical simulations involving different models for void coalescence in order to overcome the difficulty of assessing the validity of available models for void coalescence. The possible application of Thomason model and Brown–Embury model for void coalescence to thermoviscoplastic material was explored under impact tension, and the rapid local straining of intervoid ligament was revealed.
Measurement of Critical Impact Velocity of Copper in Tension* HU Jin-Wei( ), JIN Yang-Hui( ), CHEN Da-Nian( ) * * , WU Shan-Xing( ), WANG Huan-Ran( ), MA Dong-Fang( )
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