爆炸/冲击动力学学习研究中的若干疑惑

王礼立

doi:10.11883/bzycj-2020-0415

爆炸/冲击动力学学习研究中的若干疑惑

doi: 10.11883/bzycj-2020-0415

王礼立

宁波大学冲击与安全工程教育部重点实验室，浙江宁波 315211

详细信息

作者简介:
王礼立（1934－　），男，教授，博士生导师，wanglili@nbu.edu.cn

中图分类号: O347
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出版历程
- 收稿日期: 2020-11-11
- 网络出版日期: 2020-12-25
- 刊出日期: 2021-01-05

Some doubts in studying explosion/impact dynamics

WANG Lili

Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University,Ningbo 315211, Zhejiang, China

摘要

摘要: 在爆炸/冲击动力学的学习研究过程中，“疑惑”是创新的前奏。本文中，与大家分享了我所经历的若干实例，包括：静力学平衡条件可以用于波传播分析吗？满足屈服条件（σ_eff=Y）就一定进入塑性了吗？ZWT方程的黏弹性松弛时间θ₁和θ₂为什么互相无关？有质量就有惯性吗？材料动态本构响应要考虑惯性效应吗？层裂是材料动态响应问题还是结构动态响应？塑性铰分析与波传播分析有相通的内在联系吗？
- 爆炸/冲击动力学 /
- 应力波 /
- 材料本构关系 /
- 疑惑 /
- 创新
Abstract: In the learning and research process of explosion/impact dynamics, “doubt” is the prelude of innovation. Several examples of my experiences are shared here, including as follows. Can statics equilibrium conditions be used for wave propagation analysis? Must satisfy the yield condition (σ_eff = Y) be in plastic state? Why are the viscoelastic relaxation times θ₁ and θ₂ in the ZWT equation independent of each other? Is there inertia where there is mass? Should inertial effect be considered in the dynamic constitutive response of materials? Is spalling a problem of material dynamic response or structural dynamic response? Is there any inherent relation between plastic hinge analysis and wave propagation analysis?
- explosion/impact dynamics /
- stress wave /
- material constitutive relation /
- doubt /
- innovation

HTML全文

图 1 强间断横波在弦中的传播

Figure 1. A strong discontinuous transverse wave propagating in a string

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图 2 无限长直弦的突加恒速斜向点冲击

Figure 2. An infinite straight string subjected to abrupt constant-velocity oblique point-impact

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图 3 杆中一维弹塑性加载波的传播

Figure 3. One-dimensional elastic-plastic wave propagating in a bar

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图 4 松弛时间的有效影响阈

Figure 4. The effect influence domain of a relaxation time

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图 5 层裂的平板撞击实验示意图

Figure 5. Schematic of the plate impact experiment for spalling

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图 6 简支梁在冲击加载下的横向速度剖面、剪力分布、横向位移剖面、剪切应变分布和、弯矩分布

Figure 6. Simply supported beam subjected to impulsive loading: transverse velocity profile, shear force distribution, transverse displacement profile, shear strain distribution, bending moment distribution

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