纤维增强大块非晶的各向异性压缩力学行为原位实验研究

doi:10.12382/bgxb.2023.0586

摘要/Abstract

摘要：

钨纤维增强锆基大块非晶复合材料(WF/Zr-based bulk Metallic Glass matrix composite,WF/Zr-MG)由于其高密度、高强度和高绝热剪切敏感性的特点,在动能侵彻领域应用广泛。为了进一步精确表征在正撞和斜撞等穿甲过程中不同穿甲姿态对复合材料穿甲性能的影响,搭建准静态和动态显微原位压缩实验平台。通过对0°、10°、25°、45°、65°以及90°共6种不同纤维排列角度下的试样进行原位力学性能实验测试和显微图像分析,研究6种不同纤维排列角度WF/Zr-MG的压缩力学行为,进而得到复合材料失效强度随纤维排列角度的变化情况。根据实验结果划定考虑应变率与纤维排列角度WF/Zr-MG的失效强度包络线。所得结果为材料在不同穿甲姿态和加载速率下提供了一个安全应力状态范围参考,对于穿甲材料的研制具有重要意义。

关键词: WF/Zr-MG复合材料, 原位实验, 微观分析, 破坏机理

Abstract:

Tungsten fiber reinforced zirconium-based bulk Metallic Glass matrix composite (WF/Zr-MG) is widely used in the field of kinetic energy penetration due to their high density, high strength and high adiabatic shear sensitivity. The static and dynamic micro-in-situ compression test platforms are set up to accurately characterize the influence of different armor-piercing attitudes on the armor-piercing properties of composites during forward and oblique armor-piercing. The compressive mechanical behaviors of WF/Zr-MGs with 6 different fiber arrangement angles of 0°, 10°, 25°, 45°, 65° and 90° are studied by in-situ mechanical properties test and microscopic image analysis. The change of the failure strength of the composite with the arrangement angle of fibers is obtained. According to the test results, the failure strength envelope of WF/Zr-MG considering strain rate and fiber arrangement angle is defined. It provides a reference for a safe stress state range of materials under different armor-piercing attitudes and loading rates, which is of great significance for the development of armor-piercing materials.

Key words: WF/Zr-MG composite, in-situ test, microanalysis, failure mechanism

中图分类号:

TB331

李英杰, 李继承, 李宁, 郭亚洲. 纤维增强大块非晶的各向异性压缩力学行为原位实验研究[J]. 兵工学报, 2024, 45(9): 2982-2992.

LI Yingjie, LI Jicheng, LI Ning, GUO Yazhou. In-situ Test Research on Anisotropic Compressive Mechanical Behavior of Fiber Reinforced Bulk Metallic Glass Matrix Composite[J]. Acta Armamentarii, 2024, 45(9): 2982-2992.

图/表 19

图1 试样纤维排列角度θf设计图

Fig.1 Arrangement angle (θf) of fibers in the specimen

图2 显微镜下的试样抛光面(θf = 10°)

Fig.2 Polishing surface of specimen under microscope (θf =10°)

图3 准静态原位实验系统示意图

Fig.3 Schematic diagram of quasi-static in-situ test system

图4 动态原位实验系统示意图

Fig.4 Schematic diagram of dynamic in-situ test system

表1 6种试样的动态实验应变率设计

Table 1 Dynamic test strain rate design for six specimens

试样角度	动态实验应变率/s^-1
试样角度	500	1 000	2 000	3 000
0°	×	√	√	√
10°	×	√	√	√
25°	√	√	√	×
45°	√	√	√	×
65°	√	√	√	×
90°	√	√	√	×

图5 10-3s-1和10-2s-1应变率下不同纤维角度试样的应力-应变曲线集合

Fig.5 Collection of stress-strain curves for specimens at different angles at 10-3s-1 and 10-2s-1strain rates

图6 1000s-1和2000s-1应变率下不同纤维角度试样的应力-应变曲线集合

Fig.6 Collection of stress-strain curves for specimens at different angles at 1000s-1 and 2000s-1 strain rates

图7 0°试样准静态(10-3s-1)原位实验图

Fig.7 Quasi-static (10-3s-1 strain rate) in-situ test results of 0° specimen

图8 25°试样准静态(10-2s-1应变率)原位观测图

Fig.8 Quasi-static (10-2s-1 strain rate) in-situ observation of 25° specimen

图9 90°试样准静态(10-3s-1应变率)原位观测图

Fig.9 Quasi-static (10-3s-1 strain rate) in-situ observation of 90° specimen

图10 90°试样准静态(10-2s-1应变率)原位观测图

Fig.10 Quasi-static (10-2s-1 strain rate) in-situ observation of 90° specimen

图11 90°试样动态(应变率约103s-1)加载破坏过程原位图

Fig.11 Failure process of 90° specimen under dynamic loading (103s-1 strain rate)

图12 0°试样动态(应变率约103s-1)加载破坏过程原位图

Fig.12 Failure process of 0° specimen under dynamic loading (103s-1 strain rate)

图13 部分试样在动态加载下的断裂瞬间

Fig.13 Fracture of specimens under dynamic loading

图14 10-2s-1应变率下90°试样的DIC处理图

Fig.14 DIC results of 90° specimen at 10-2s-1 strain rate

图15 103s-1应变率下θf =90°试样的DIC处理图

Fig.15 DIC results of 90° specimen at 103s-1 strain rate

图16 WF/Zr-MG失效应力与纤维排列角关系

Fig.16 Relationship between failure stress and fiber arrangement angle of WF/Zr-MG composite

图17 纤维在不同θf下抵抗基体中剪切带传播的机理示意图

Fig.17 Schematic diagram of the mechanism of shear band propagation in the resistance matrix of fibers at differentθf

图18 WF/Zr-MG失效包络线

Fig.18 Failure envelope of WF/Zr-MG composites

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