Research on Experimental Method for Impact Strength of Large Load FRP Supporting Element of a Shipboard Equipment

doi:10.12382/bgxb.2022.0613

Abstract

Abstract:

The navies of all countries have been attached to the research on the shock characteristics of shipboard equipment’s supporting element. However, the implementation of the impact strength tests for large load supporting element become a problem because of the load requirement going beyond the capacity of the test devices. The test methods for the impact strength of large load FRP support element of a power equipment are presented based on the non-contact underwater explosion and the shock environmental parameters of standard floating shock platform(FSP). The test devices are designed by means of ensuring the shock load, reducing the test load mass and improving the system installatrion frequency under the low speed impact condition. The test conditions are designed by means of calculating the shock factors based on the shock spectrum and the shock load requirement. Furthermore, the reduction factor between the actual test and the design factors is obtained from the influence of the several joint surfaces in the testing system on the shock load transfer. The results show that the deviation between the test load and the required load is less than 5%. The method provides a reference for the similar test in the future.

Key words: shipboard equipment, supporting element, impact strength, floating shock platform, shock environment

CLC Number:

O347

CHEN Hui, LIU Jianhu, CHEN Xuebing, HUANG Yaping, CAI Rongkun. Research on Experimental Method for Impact Strength of Large Load FRP Supporting Element of a Shipboard Equipment[J]. Acta Armamentarii, 2024, 45(3): 957-962.

Figures/Tables 11

Fig.1 Diagrammatic sketch of UNDEX test in the standard floating shock platform

Fig.2 Diagrammatic sketch of impact strength test device of composite material support structure

Fig.3 Diagrammatic sketch of test load structure(upper) and first-order frequency(lower)

Fig.4 Diagrammatic sketch of Haff support structure

Fig.5 Picture 1 of assembling of the impact strength test device of composite material support structure

Fig.6 Picture 2 of assembling of the impact strength test device of composite material support structure

Table 1 Weight list of impact strength test device of composite material support structure

部件名称	质量/t	合计/t
负载框架(含支撑工字钢、铅块放置柜)	17.38
铅板	9.68
支承轴(一对)	2.58	36.36
哈夫支座(一对)	6.08
连接卡块(8只)	0.64

Table 2 Test conditions of impact strength of composite material support structure

爆源/ kgTNT	爆深/ m	水平爆距/ m	冲击因子 SF	攻角/ (°)	备注
28	7.50	11.0	0.252	23.7	1000t试验
28	7.50	5.60	0.420	36.2	1620t试验
28	8.50	3.60	0.502	48.7	2000t试验

Fig.7 Impact acceleration-time curve of test load under 1620t impact load

Table 3 Impact load beared by composite material support structure

试验工况	冲击力/t	平均值/t	要求冲击载荷/t	相对偏差/ %
1000t试验	1021 1068	1045	1000	4.45
1620t试验	1571 1654	1613	1620	-0.46
2000t试验	2018 1985	2002	2000	0.07

Fig.8 Relation between the shock load and impact factor

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