PBX-1炸药的力学性能和本构关系

孙文旭; 罗智恒; 唐明峰; 李明; 刘彤; 章定国

doi:10.11883/bzycj-2018-0398

PBX-1炸药的力学性能和本构关系

doi: 10.11883/bzycj-2018-0398

孙文旭^{1, 2, 3,},
罗智恒^{2, 3},
唐明峰²,
李明²,
刘彤^{3, 4, ,},
章定国¹

1.
南京理工大学理学院，江苏南京 210094
2.
中国工程物理研究院化工材料研究所，四川绵阳 621999
3.
中国工程物理研究院研究生院，四川绵阳 621999
4.
中国工程物理研究院成都科学技术发展中心，四川成都 610200

详细信息

作者简介:
孙文旭（1986－　），男，博士研究生，助理研究员，664729892@qq.com

通讯作者:
刘　彤（1964－　），男，研究员，Tliu@swust.edu.cn

中图分类号: O381
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- 被引次数: 0
出版历程
- 收稿日期: 2018-10-17
- 修回日期: 2018-12-03
- 刊出日期: 2019-07-01

Compressive mechanical properties and constitutive relations of PBX-1

SUN Wenxu^{1, 2, 3
,},
LUO Zhiheng^{2, 3},
TANG Mingfeng²,
LI Ming²,
LIU Tong^{3, 4
, ,},
ZHANG Dingguo¹

1.
School of Sciences, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China
3.
Graduate School of China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
4.
Chengdu Science Development Center of China Academy of Engineering Physics, Chengdu 610200, Sichuan, China

摘要

摘要: PBX的力学行为对其安全性有重要影响。为研究PBX-1的力学性能，以PBX-1为研究对象，进行准静态力学实验和SHPB（分离式霍普金森压杆）实验研究。结果表明，准静态压缩实验中，试样的裂纹出现在与加载方向大约成45°的最大剪应力方向。SHPB实验中，在应变率100～1 500 s⁻¹范围内，随着应变率的提高，PBX-1炸药的动态屈服强度、动态压缩强度和破坏应变不断提高。动态屈服强度逐渐从静态的2.77 MPa增加至16.1 MPa；压缩强度从7.46 MPa增加至16.1 MPa，破坏应变从6.23%增加到26.4%。同时，基于Z-W-T模型，建立了一种含损伤的动态黏弹性本构模型，在330～1 500 s⁻¹应变率范围内具有较高的精度，可以较好地描述PBX-1炸药在达到破坏前的动态力学行为。
- PBX-1炸药 /
- 动态力学行为 /
- 损伤 /
- Z-W-T模型
Abstract: The mechanical behavior of PBX has an important impact on its safety. In order to study the mechanical properties of PBX-1, the quasi-static mechanical experiments and SHPB (split-Hopkinson pressure bar) experiments were conducted. The results showed that the crack direction was the direction of maximum shear stress, which was about 45° to the loading direction in the quasi static compression tests. In the SHPB tests, the dynamic yield strength, dynamic compression strength and failure strain of PBX-1 explosive were continuously improved with the improvement of strain rate in the range of 100−1 500 s⁻¹.The dynamic yield strength gradually increased from the static 2.77 MPa to 16.1 MPa. The compression strength increased from 7.46 MPa to 16.1 MPa, and the failure strain increased from 6.23% to 26.4%. At the same time, based on the Z-W-T model, a dynamic viscoelastic constitutive model with damage was established. It has a high accuracy in the range of 330−1 500 s⁻¹ strain rate, and could be used to describe the dynamic mechanical behavior of PBX-1 before failure.
- PBX-1 explosive /
- dynamic behavior /
- damage /
- Z-W-T constitutive model

HTML全文

图 1 PBX-1炸药的宏观裂纹形貌

Figure 1. Macro crack feature of PBX-1

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图 2 PBX-1炸药的典型细观形貌

Figure 2. Typical meso-scale features of PBX-1

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图 3 不同速度加载后的试样破坏状态

Figure 3. Damage status under various velocity loading

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图 4 PBX-1炸药不同应变率下的应力(σ)-应变(ε)曲线

Figure 4. Stress-strain relationship of PBX-1 under various strain (σ)-rates (ε)

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图 5 PBX-1炸药强度和失效应变随应变率变化

Figure 5. Relations between strength/failure strain and strain rate

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图 6 Z-W-T非线性黏弹本构模型

Figure 6. Z-W-T non-linear viscoelastic constitutive model

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图 7 实验测试曲线与拟合曲线

Figure 7. Comparison between experimental and fitting curves

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图 8 模型计算曲线与实验测试曲线对比（$\dot \varepsilon $=660 s⁻¹）

Figure 8. Comparison between experimental and calculated curves ($\dot \varepsilon $=660 s⁻¹)

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表 1 本构模型材料参数

Table 1. Parameter values of constitutive models

D₀	D₁	c	a	σ_m/MPa	m	E₂/MPa	θ₂/μs
8.591	−0.484	1.167	5.480	5.480	43.687	101.156	75.482

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