超高韧性水泥基复合材料—纤维混凝土组合靶体抗两次打击试验研究

吴平; 周飞; 李庆华; 徐世烺; 陈柏锟

doi:10.11883/bzycj-2021-0178

超高韧性水泥基复合材料—纤维混凝土组合靶体抗两次打击试验研究

doi: 10.11883/bzycj-2021-0178

浙江大学高性能结构研究所，浙江杭州 310058

基金项目: 国家自然科学基金（51678522, 51622811）

详细信息

作者简介:
吴　平（1993－　），男，博士研究生，21712038@zju.edu.cn

通讯作者:
李庆华（1981－　），女，博士，教授，liqinghua@zju.edu.cn

中图分类号: O383
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- 文章访问数: 453
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-08
- 修回日期: 2021-07-08
- 网络出版日期: 2022-03-08
- 刊出日期: 2022-04-07

Experimental study on the resistance of the ultra high toughness cementitious composites material-fiber concrete composite targets subjected to twice projectiles impact

Institute of Advanced Engineering Structures, Zhejing University, Hangzhou 310058, Zhejiang, China

摘要

摘要: 超高韧性水泥基复合材料（ultra high toughness cementitious composites, UHTCC）具有超高的韧性、良好的耐久性和优异的耗能效果，这些特性使得UHTCC在防护工程中具有广阔的应用前景。为了更好地研究UHTCC与纤维混凝土组合结构在二次打击条件下的抗侵彻性能，首先测量了UHTCC和聚乙烯醇纤维增强混凝土（polyvinl alcohol fiber reinforced concrete, FRC）的基本力学参数。然后采用25 mm口径的弹道滑膛炮对直径为750 mm、高为600 mm的圆柱形UHTCC靶体、FRC靶体、UHTCC-FRC组合靶体（UHTCC-FRC composite target）进行了弹体速度为550 m/s的二次侵彻试验，得到了弹体和三类靶体的破坏数据，包括弹体的侵彻深度、弹体的磨蚀、靶体迎弹面的开坑直径和面积、弹坑深度、迎弹面的裂纹数量以及裂纹最大宽度。在此基础上分析了骨料、结构形式和两次打击的间距对UHTCC-FRC组合靶体抗侵彻性能的影响。结果表明：相同试验条件下，与普通混凝土和超高性能混凝土相比，UHTCC能够有效的减小迎弹面的开坑直径，但会增加弹体侵彻深度；将50 mm的UHTCC置于组合靶的迎弹面可以有效地减少迎弹面的开坑直径；弹体二次侵彻深度大于弹体一次侵彻深度，靶体在二次冲击下的开坑面积小于靶体初次冲击下的开坑面积。
- 超高韧性水泥基复合材料 /
- 聚乙烯醇纤维增强混凝土 /
- UHTCC与FRC组合靶体 /
- 二次侵彻试验 /
- 开坑面积
Abstract: Ultra high toughness cementitious composites (UHTCC) have ultra-high toughness, good durability and excellent energy consumption effect. These characteristics make UHTCC have broad applications in protection engineering. To better investigate the penetration resistance of UHTCC composite structure subjected to second strike conditions, the basic mechanical parameters of the UHTCC and polyvinl alcohol fiber reinforced concrete (FRC) were measured first. Then, a 25 mm caliber ballistic smoothbore gun was used against a cylindrical UHTCC, FRC and UHTCC-FRC composite targets with a diameter of 750 mm and a height of 600 mm. The targets were subjected to two-time penetration tests of 550 m/s. The damage data of the projectile and the three types of targets were obtained, including the penetration depth of the projectile, the abrasion of the projectile, the crater diameter and area of the target’s strike surface, the crater depth, the number of cracks and the maximum crack width on the strike surface. On this basis, the influence of aggregate, structure type and distance between two strikes on the penetration resistance of UHTCC composite targets was analyzed. The results show that under the same test conditions, compared with the normal concrete and ultra-high performance concrete, the UHTCC can effectively reduce the crater diameter of the strike surface, but the penetration depth of the projectile increases; the 50mm UHTCC placing on the front surface of the functionally graded target can effectively reduce the cratering diameter of the strike surface; the secondary penetration depth of the projectile is greater than the primary penetration depth of the projectile, and the crater area of the target under the secondary impact is smaller than the crater area of the target under the first impact.
- ultra high toughness cementitious composites /
- polyvinl alcohol fiber reinforced concrete /
- UHTCC FRC composite targets /
- second penetration test /
- crater area

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图 1 试验布置示意图

Figure 1. Schematic diagram of test layout

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图 2 试验靶体的结构形式

Figure 2. Structure types of test target

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图 3 UHTCC直接拉伸测试

Figure 3. UHTCC uniaxial tensile test

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图 4 FRC直接拉伸测试

Figure 4. FRC uniaxial tensile test

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图 5 弹体尺寸

Figure 5. The size of projectile

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图 6 高速摄影记录弹体撞击靶体过程

Figure 6. Process of the projectile impacting the target recorded by high-speed photography

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图 7 靶体的迎弹面损伤

Figure 7. Target impact surface damage

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图 8 初次和二次打击下不同靶体的破坏形貌

Figure 8. Destruction morphology of different targets subjected to the first and second strike

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图 9 试验后回收的弹体

Figure 9. Recovered projectiles after the test

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图 10 骨料对弹坑直径和侵彻深度的影响

Figure 10. Influences of the coarse aggregate on crater diameter and depth of penetration

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图 11 侵彻深度与弹体的冲击速度^[36-38]

Figure 11. Depth of penetration versus striking velocity of projectile^[36-38]

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图 12 弹坑直径与弹体冲击速度^[36-40]

Figure 12. Crater diameter versus striking velocity of projectile^[36-40]

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图 13 骨料强度（硬度）对弹坑直径和侵彻深度的影响

Figure 13. Influences of the coarse aggregate strength (hardness) on crater diameter and depth of penetration

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图 14 UHTCC位于表面层对组合靶的抗侵彻性能的影响

Figure 14. Influence of UHTCC in the top layer on the penetration resistance of composite targets

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图 15 UHTCC位于中间层对组合靶的抗侵彻性能的影响

Figure 15. Influence of UHTCC in the middle layer on the penetration resistance of composite targets

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图 16 重复打击对弹坑面积和侵彻深度的影响

Figure 16. Influences of repeated impacts on craters areas and depth of penetration

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图 17 弹着点相对偏差距离与二次侵彻深度比之间的关系

Figure 17. Relationship between the relative deviation distance of the impact point and the second penetration depth ratio

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表 1 UHTCC和FRC各组分的质量浓度（kg/m³）

Table 1. Mass concentrations of components (kg/m³) in UHTCC and FRC

材料	胶凝材料	砂子	减水剂	玄武岩骨料	刚玉骨料	水	PVA
UHTCC	1 405	281	2	0	0	390	26
FRC-BA	1 405	281	2	1 056	0	390	14.3
FRC-CA	1 405	281	2	0	1 103	390	14.3

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表 2 UHTCC和FRC的力学参数

Table 2. Mechanical parameters of UHTCC and FRC

材料编号	抗压强度/MPa	抗拉强度/MPa
UHTCC	30.0	3.5
FRC-BA	41.2	3.1
FRC-CA	42.7	3.0

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表 3 错位打击下不同靶体的侵彻试验结果

Table 3. Penetration test results of different targets subjected to dislocation impact

试验编号	m/g	v/(m/s)	r/mm	H/mm	D_c/mm	D/mm	S₁/cm²	S/cm²	N	w_max/mm
T1-P2-1	353.1	542.3	172	367	43	103	83.3	78.4	0	0.1
T1-P2-2	354.2	581.4	172	448	46	101	80.1	77.2	0	0.1
T2-P1-1	353.2	582.0	147	285	89	178	248.8	250.7	9	1.1
T2-P1-2	353.0	566.0	147	344	58	167	219.0	238.1	11	2.5
T2-P2-1	353.8	574.4	158	311	51	90	63.6	56.2	4	0.7
T2-P2-2	353.2	600.7	158	419	30	72	40.7	38.9	7	2.0
T3-P2-1	352.8	579.1	174	293	71	169	224.3	257.2	8	1.2
T3-P2-2	352.4	579.0	174	329	67	127	126.7	129.5	9	1.2
T4-P2-1	354.0	580.0	192	335	46	113	100.2	110.5	3	1.0
T4-P2-2	353.2	581.0	192	329	48	139	151.7	160.7	3	1.0
T5-P1-1	352.3	582.5	122	312	48	108	91.6	99.7	2	0.1
T5-P1-2	352.4	587.0	122	361	39	89	62.2	47.8	3	0.1
T5-P2-1	351.0	570.0	144	230	44	106	116	116.6	0	0.15
T5-P2-2	354.0	581.0	144	294	30	84	55.4	49.4	0	0.15

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