Shenzhen University

Northwestern Polytechnical University

Yulong Li

Tao Suo

Zhongbin Tang

Heping Xie

Tao Zhou

Jianbo Zhu

Jun Liu

Zhiyi Liao

Liangdao Zhou

Guangrong Zhu

Hao Cong

Zhengli Zhang

Jian Zhao

Hailiang Nie

Jun Lv

The present disclosure provides a dynamic true triaxial electromagnetic Hopkinson bar system, including a central cubic box, a horizontal cruciform support platform, and a central support platform, wherein the central cubic box is disposed in the center of the upper surface of the central support platform; the central cubic box and the horizontal cruciform support platform form an orthogonal coordinate system for precisely positioning and centering the dynamic true triaxial electromagnetic Hopkinson bar system; the confining-pressure loading systems, electromagnetic pulse generators, circular bulges, square bars, and self-lubricating square bar fixation and support frames in the directions X, Y, and Z are respectively symmetrically arranged by taking the central cubic box as a symmetric center; and the systems in the directions X, Y, and Z together construct the dynamic true triaxial electromagnetic Hopkinson bar system.

Dynamic true triaxial electromagnetic Hopkinson bar system

The present disclosure provides a dynamic true triaxial electromagnetic Hopkinson bar system and testing method, the method including: firstly, before applying a static prestress and an impact load, recording and storing complete ultrasonic signals in the directions X, Y, and Z without application of the static prestress and the impact load; secondly, applying the static prestress; thirdly, recording and storing complete ultrasonic signals in the directions X, Y, and Z under the static prestress; fourthly, applying the impact load, and utilizing an triaxial and six-directional synchronous-coordinated-control electromagnetic loading system to apply a dynamic impact load to a test specimen; and fifthly, after completing the dynamic impact loading test, recording and storing once again complete ultrasonic signals in the directions X, Y, and Z without releasing the static prestress after application of the static prestress and the dynamic impact load.

Dynamic true triaxial electromagnetic Hopkinson bar system and testing method

An electromagnetic induction type Hopkinson pressure/tension bar loading device and experiment method therefor. The device not only can generate compression stress waves but also can generate tension stress waves through the electromagnetic induction principle, and is applied to the loading of a Hopkinson tension bar and a pressure bar. Thus, the loading systems for a Hopkinson tension bar and a pressure bar can simultaneously achieve the strain rate and strain range, which the traditional split Hopkinson bar experiment cannot reach, on the same device, so that the Hopkinson bar experiment technology is standardized, and the experiment devices for a tension bar and a pressure bar are integrated, thereby reducing complexity and floor space of equipment.

Electromagnetic induction type hopkinson tension-compression bar loading device and experiment method

The present invention relates to a tail for improving anti-bird strike performance of an aircraft. A leading edge reinforcement having a shape of an isosceles triangle is located inside a tail leading edge. The leading edge reinforcement is spanwisely fixed in sections between respective spans formed by the wing rib inside the tail leading edge along the tail of the aircraft. An apex angle of the leading edge reinforcement is the same as an apex angle or arc transition of the tail leading edge skin. The leading edge reinforcement is fixedly connected with the small front beam by a leading edge reinforcement fixed surface. The present invention additionally installs a leading edge reinforcement in the original tail of the aircraft.

Tail capable of improving anti-bird strike performance of aircraft

Growing community of inventors

Shaanxi, China

Yulong Li