Research on Explosive Separation of Carbon Fiber Composite Weave Plate

Zhijie He,Hong Su,Zekan He,Meng Wang,Haijun Xuan,Kang Zhao,Amr A Nassr

doi:10.1155/2021/6633595

Abstract

By using the C-shaped metal lead shell and copper shell to wrap the detonating cord, the restraint of the explosion energy is improved, and the simple charge structure is used to achieve the purpose of effectively separating the carbon fiber composite woven plate in a limited and small space. The commercial software AUTODYN was used for numerical simulation, The monitoring points of stress, velocity, and specific internal energy were set up, combined with Tsai-Wu tensor strength criterion, the plate failure and the process of shell metal reflecting and absorbing energy when the plate was separated under the shell constraint were observed, respectively. Through further analysis of the experimental phenomena and calculated data, it is concluded that the main reason for the fracture failure of the plate is the opposing compression of the shock waves on both sides of the plate, and the layer cracks are caused by the tension of the stress wave in the later stage. The charge structure of the detonating cord wrapped by the metal shell can effectively use its inertia to restrain the explosion energy and improve the separation ability during the process of explosively separating the carbon fiber composite woven plate.

Highlights

Separation technology is a key link in aerospace engineering
Ochola et al [7] studied the mechanical properties of the composite plates under compression load under different strain rates. e results showed that the failure modes of the composite plates in the lower layer of the low strain rate were mainly shear failure, while the failure modes of the composite plates at the high strain rate were mainly fiber and matrix debonding, base compression failure, and interlayer delamination
It can be seen from the test phenomenon that the test effect of 1# plate without any inertial constraint is the worst, and the composite plate has the least damage and is not separated; 2# plate and 3# plate are completely separated. e tensile strength of the plate is less than the compressive strength; it can be seen from Figure 12(a) that the side damage effect of 1# plate is significantly layered in the direction of thickness, so the damage mode of 1# plate is mainly tensile failure caused by stress wave

Summary

Introduction

Separation technology is a key link in aerospace engineering. At present, the separation technology mainly includes shaped charge cable [1], cylinder type explosive cable, and expansion pipe [2]. ese separation devices are mainly composed of pyrotechnical components, which do not bear large loads themselves and have the advantages of simple structure, reliability, speediness, good synchronization, and so on. erefore, they are widely used in the stage separation of many spacecraft at home and abroad.

Results

Conclusion