High tensile strength and good toughness play an important role in improving the mechanical performance of separator films, such as resistance to external force, service life and so on. In the present research, the strain rate effect and microbuckling behavior of two types of anisotropic separators for lithium-ion battery (LIB) under different strain rates are investigated. The results conclude that the anisotropy effect and strain rate effect are displayed obviously along the machine direction (MD), diagonal direction (DD) and transverse direction (TD). The constitutive relationship with a strain rate of anisotropic macromolecular separator for LIB is. The separator has high tensile strength along MD and good toughness along DD and TD. The maximum error of strain rate strengthening coefficient and about the material parameter is less than 15%. Finally, the critical stress σ x,crit =-Ekπ 2 (t/B) 2 /12(1-μ 2) characterizing the micro-buckling behavior of macromolecular separators are proposed and discussed. The critical stress error rates are approximately Error = 2-7% compared with experimental results. This research provides guidance to improve the mechanical property of anisotropic separator and addresses the safety of LIB.
<p>A friction damper is proposed and tested for the use in steel coupling beams in high-rise buildings. Multiple brake pad-to-steel interfaces are jacketed by disc springs and high-strength bolts to yield stable frictional resistance. Damage is only likely to take place on the brake pad-to-steel friction interface. One can easily disassemble the damper and remove the brake pads by loosening the bolts, either for damage inspection or for replacement when necessary. Cyclic loading tests on steel coupling beams with the proposed friction damper were conducted to show the reliable frictional behavior of the chosen material. The inherent high initial stiffness of the friction interface and the well-defined frictional force without much over-strength make it possible to mimic the stiffness and yield strength of conventional RC or steel coupling beam counterparts, but with superior energy dissipating capacity and less variability of the strength demand for adjacent elements and joints.</p>
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