重组竹顺纹冲击力学性能研究

王明涛; 卢玉斌; 蔡雄峰; 姜锡权; 陈林碧

doi:10.11883/bzycj-2021-0260

重组竹顺纹冲击力学性能研究

doi: 10.11883/bzycj-2021-0260

王明涛^{1, 2,},
卢玉斌^1, ,,
蔡雄峰¹,
姜锡权³,
陈林碧⁴

1.
中国科学院福建物质结构研究所泉州装备制造研究所，福建晋江 362000
2.
中北大学，山西太原 030051
3.
合肥姜水动态力学实验技术有限公司，安徽合肥 230031
4.
福建有竹科技有限公司，福建永安 366000

基金项目: 福建省科学院科学技术合作计划（STS）（2020T3018）

详细信息

作者简介:
王明涛（1996－　），男，硕士研究生，s1908091@st.nuc.edu.cn

通讯作者:
卢玉斌（1980－　），男，博士，研究员，luyubin@fjirsm.ac.cn

中图分类号: O347.3; TU531.3
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- 文章访问数: 441
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-28
- 修回日期: 2021-11-09
- 网络出版日期: 2022-02-14
- 刊出日期: 2022-05-09

A study of impact mechanical properties of the bamboo scrimber along the grain

1.
Quanzhou Institute of Equipment Manufacturing, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Jinjiang 362000, Fujian, China
2.
North University of China, Taiyuan 030051, Shanxi, China
3.
Hefei Jiangshui Dynamic Mechanics Experimental Technology Co., Ltd., Hefei 230031, Anhui, China
4.
Fujian Youzhu Technology Co. Ltd., Yong’an 366000, Fujian, China

摘要

摘要: 重组竹是一种新型竹基复合材料，其力学性能优于落叶松等木材。为评价重组竹在动态加载下的顺纹抗冲击力学性能，以密度1.06 g/cm³、含水率8.52%、龄期3～5年的毛竹基重组竹为研究对象，通过准静态单轴压缩和循环加卸载以及动态加载实验，研究了重组竹加载变形过程、各项力学性能指标以及对应变率的敏感性。结果表明：重组竹顺纹压缩过程可以分为弹性变形和弹塑性变形阶段，破坏类型为延性破坏，其各项强度指标随应变率的提高而提高，动态增长因子与应变率之间呈现线性关系，斜率为0.0024；重组竹压缩过程中的应变比能与应变之间呈线性关系，且随应变率的增长而增大，证明其吸能能力随着应变率的增大而提高。实验结果证明，重组竹顺纹具有良好的抗冲击力学性能和显著的应变率效应。
- 重组竹 /
- 冲击力学性能 /
- 动态增长因子 /
- 应变率效应 /
- 应变比能
Abstract: Bamboo scrimber is a new type of bamboo-based composite materials with outstanding mechanical properties which is more effective than some wood such as pine. In order to evaluate the impact mechanical properties of the bamboo scrimber along the grain under impact loading, this study made the samples by commercial bamboo scrimber as the research object with the density about 1.06 g/cm³ and the moisture content about 8.52%, manufactured by Moso bamboo with the age of 3−5 years. The quasi-static uniaxial compression, cyclic loading and unloading, and dynamic loading tests were all carried out to explore its loading deformation process, various mechanical performance parameters, and the strain rate effect under different strain rates, as obtained by the MTS universal material testing machine and the split Hopkinson pressure bar (SHPB) testing system, respectively. The results show that the compression process of the bamboo scrimber along the grain can be divided into an elastic deformation stage and an elastic-plastic deformation stage. The failure type of bamboo scrimber under compression load was ductile failure with much better energy absorption capacity than brittle failure. Its various strength indexes, including elastic ultimate strength, yield strength and failure strength showed high strain rate sensibility, all go up with the increase of the strain rate. A linear relationship exists between the dynamic increase factor (DIF) and strain rate, with a slope of about 0.0024. The strain energy density during the compression process of the bamboo scrimber also exhibits a linear relationship with the strain, and it increases with the increase of strain rate, indicating that the energy absorption capacity of bamboo scrimber increases with the increasing strain rate. In summary, as verified by tests, the impact mechanical properties of the bamboo scrimber along the grain are good and its strain rate effect is significant.
- bamboo scrimber /
- impact mechanical properties /
- dynamic increase factor (DIF) /
- strain rate effect /
- strain energy density

HTML全文

图 1 重组竹试样制备

Figure 1. Manufacturing of bamboo scrimber samples for tests

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图 2 MTS材料试验机和SHPB实验平台

Figure 2. MTS testing machine and SHPB experimental platform

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图 3 佩戴保护套筒空打波形

Figure 3. Wave profiles with protection

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图 4 应力平衡情况

Figure 4. Stress equilibrium situation

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图 5 恒定应变率情况

Figure 5. Constant strain rate situation

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图 6 重组竹在不同应变率下的应力-应变曲线

Figure 6. Stress-strain curves of bamboo scrimber under different strain rates

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图 7 重组竹准静态压缩的3个变形阶段

Figure 7. Three deformation stages of bamboo scrimber under quasi-static compression

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图 8 循环加卸载的应力-应变曲线

Figure 8. Stress-strain curves of cyclic loading and unloading tests

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图 9 重组竹在冲击加载下的破坏形态

Figure 9. Failure morphology of bamboo scrimber under impact loading

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图 10 重组竹在不同应变率下的平台应力

Figure 10. The plateau stress of bamboo scrimber under different strain rates

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图 11 重组竹在不同应变率下的动态增强因子

Figure 11. The dynamic increase factor of bamboo scrimber under different strain rates

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图 12 重组竹在不同应变率下的应变比能

Figure 12. The strain energy densities of bamboo scrimber under different strain rates

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表 1 重组竹在不同应变率下的动态力学参数

Table 1. Dynamic mechanical parameters of bamboo scrimber under different strain rates

编号	应变率/s⁻¹	屈服强度/MPa	压缩破坏强度/MPa	平台应力/MPa	应变比能/（MJ·m⁻³）	应力平衡因子η/%	恒应变率因子κ/%
QX1-10	10⁻⁴	63.19	71.68	68.35	5.72	−	−
变异系数	[0]	[7.05%]	[7.60%]	[7.44%]	[7.69%]	−	−
DX-01	335	116.69	135.03	132.08	8.73	95.91	26.10
DX-02	354	120.03	131.41	129.78	9.83	95.56	25.06
DX-03	356	122.24	134.98	134.60	9.58	97.60	30.00
平均值	348	119.65	133.81	132.15	9.38	−	−
变异系数	[3.33%]	[2.34%]	[1.55%]	[1.82%]	[6.15%]	−	−
DX-04	430	121.61	142.72	141.48	9.34	95.01	26.88
DX-05	450	129.60	135.14	134.42	11.83	95.34	29.55
DX-06	480	126.10	146.22	140.06	12.78	96.56	21.34
平均值	449	125.77	141.36	138.65	11.32	−	−
变异系数	[4.53%]	[2.60%]	[3.27%]	[2.20%]	[12.82%]	−	−
DX-07	502	136.27	143.29	141.82	14.80	95.35	26.45
DX-08	512	136.04	143.43	139.97	14.18	97.28	27.65
DX-09	542	133.05	142.95	140.40	14.88	95.55	28.86
平均值	519	135.12	143.22	140.73	14.62	−	−
变异系数	[3.28%]	[1.09%]	[0.14%]	[0.56%]	[2.14%]	−	−
DX-10	608	164.84	174.16	170.89	21.12	96.87	25.65
DX-11	642	154.72	164.12	160.20	20.46	98.55	23.53
DX-12	654	165.39	174.02	171.66	20.92	95.95	27.68
平均值	635	161.65	170.77	167.58	20.83	−	−
变异系数	[3.07%]	[3.03%]	[2.75%]	[3.12%]	[1.33%]	−	−

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