No abstract

Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.002 Å R factor = 0.040 wR factor = 0.120 Data-to-parameter ratio = 14.5For details of how these key indicators were automatically derived from the article, see A packing diagram for the title compound. Dashed lines represent hydrogen bonds.

The stress-strain curves of 2A16 under different strain rate range (10-3s-1-103s-1) and different temperature range (293K-673K) were obtained through the quasi-static compression test and SHPB test by experimental method. The parameters were determined based on Johnson-Cook model and the strain rate hardening term in them was modified. The results show that 2A16 is a kind of strain rate and sensitive temperature materials. The flow stress increases with strain rate increasing, while that decreases with temperature increasing. The deviation is large between the unamended Johnson-Cook constitutive model and test data, while the modified constitutive model is a good agreement with experimental results. And the study is a preparation for the numerical simulation of 2A16 rivet electromagnetic riveting.

Electromagnetic riveting is a kind of energy conversion technology and forming coil is the key component of energy conversion. Coil parameters include the turns and wire cross section size. The effects of coil parameters on discharge current, riveting force, rivet deformation degree and energy conversion rate were investigated by experimental method in low voltage electromagnetic riveting. The results show that with the coil turns increasing, coil inductance increases, discharge current amplitude decreases, cycle increases, rivet deformation degree increases and the energy conversion rate improves when the coil wire cross section size is the same. And with the coil wire width increasing, the coil resistance decreases, discharge current amplitude increases, rivet deformation degree increases and the energy conversion rate improves when the coil turns is same. By rational design of coil turns and wire section size, low voltage electromagnetic riveting is an effective way to realize deformation of strain rate sensitive material TA1 rivets.

The analysis of charge circuit and discharge circuit is a key part in the theoretical study of electromagnetic riveting electromagnetic field. Numerical simulation was used to establish the charge circuit model and the discharge circuit model which was an electric circuit-magnetic circuit coupling process by ANSYS. The simulation of charge circuit shows that the development of the charge current over time is an exponential descending change and that of the charge voltage over time is an exponential ascending change. And, the simulation of discharge circuit indicates that the driver is mainly subjected to axial magnetic force, whose distribution is non-uniform along the radial direction of driver, and the maximum value of axial magnetic force locates in about half of the driver radius.