基于近场动力学方法的NEPE推进剂断裂失效

doi:10.12382/bgxb.2024.0613

摘要/Abstract

摘要：

开展了硝酸酯增塑聚醚(Nitrate Ester Plasticized Polyether,NEPE)推进剂在100mm/min拉伸速率下的单边缺口张力实验,研究了NEPE推进剂裂纹扩展过程中的力学响应、裂纹形态和演化路径。基于键型近场动力学理论,模拟了NEPE推进剂的裂纹扩展失效过程,计算了断裂韧性临界应力强度因子,并提出了与应力强度因子相关的考虑推进剂燃速的断裂准则。实验结果表明:NEPE推进剂在裂纹扩展过程中会出现钝化断裂现象;宏观裂纹扩展发生之前,推进剂内部就已出现损伤。键型近场动力学方法可以准确模拟NEPE推进剂的裂纹扩展过程、计算应力强度因子并可视化推进剂内部的损伤情况,说明近场动力学方法能够为NEPE推进剂断裂过程的数值模拟提供新的方法。

关键词: NEPE推进剂, 断裂特性, 近场动力学, 裂纹扩展, 应力强度因子

Abstract:

The mechanical response,crack morphology and evolutionary path of NEPE propellant during the crack propagation are investigated through single-edge notched tension (SENT) experiment at a tensile rate of 100mm/min.Based on the bond-based peridynamic (BBPD) theory,the failure process of crack propagation in NEPE propellant is simulated,the critical stress intensity factor of fracture toughness is calculated,and a fracture criterion considering the burning rate of the propellant is proposed.Experimental results show that a blunting fracture occurs in NEPE propellant during crack propagation.Prior to macroscopic crack propagation,an internal damage takes place in the propellant.The BBPD method can accurately simulate the crack propagation process of NEPE propellant,compute the stress intensity factor,and visualize the internal damage.This suggests that the peridynamic technique provides a new approach to simulate the fracture process of NEPE propellant.

Key words: NEPE propellant, fracture property, peridynamics, crack propagation, stress intensity factor

刘瀚文, 付小龙, 王江宁, 孟赛钦. 基于近场动力学方法的NEPE推进剂断裂失效[J]. 兵工学报, 2025, 46(7): 240613-.

LIU Hanwen, FU Xiaolong, WANG Jiangning, MENG Saiqin. Research on Fracture Failure of NEPE Propellant Based on Peridynamics[J]. Acta Armamentarii, 2025, 46(7): 240613-.

图/表 10

图1 NEPE推进剂试件和实验装置

Fig.1 NEPE propellant specimens and experimental setup

图2 物质点x和近场域Hx

Fig.2 Material point x and horizon Hx

图3 SENT实验载荷-位移曲线

Fig.3 Load-displacement curve of SENT experiment

图4 裂纹扩展过程(裂纹尖端局部区域)

Fig.4 The entire process of crack propagation (local area in crack tip)

图5 NEPE推进剂BBPD模型

Fig.5 BBPD model of NEPE propellant

表1 近场动力学材料参数

Table 1 Material parameters for simulation

密度/(g·cm^-3)	初始模量/MPa	能量释放率/(J·m^-2)
1.82	5.998	2412.11

图6 BBPD模型(局部区域):100mm/min拉伸速率下的计算结果

Fig.6 BBPD model (local area):calculated results at 100mm/min tensile rate

图7 实验曲线与仿真曲线的对比(vy=100mm/min)

Fig.7 Comparisons between experimental and simulation curves (vy=100mm/min)

图8 拉伸过程中的损伤云图

Fig.8 Damage nephogram of crack during tensile process

表2 实验和仿真得到的临界应力强度因子

Table 2 The critical stress intensity factors obtained by experiment and simulation

项目	K_dc/(MPa·mm^0.5)	K_IC/(MPa·mm^0.5)
实验	1.81	2.06
仿真	1.67	1.86

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