A Dynamics Model of PVC Foam Sandwich Panels under Close-in Blast Loading

doi:10.12382/bgxb.2022.0729

Abstract

Abstract:

Threedeformation stages of PVC foam sandwich panel are analyzed to study the dynamic response of polyvinyl chloride (PVC) foam sandwich panels under close-in blast loading. The deflection surface function is derived, which can reflect the localization characteristics of the panels under close-in blast loading. A single-degree-of-freedom rigid-plastic dynamics model is established, considering the effects of bending moment and membrane force on deformation of panels and core. The dynamic responses of PVC foam sandwich panels with different panel and core thicknesses under close-in blast loading are calculated using the nonlinear numerical calculation software, and the panel deformation and velocity variation are analyzed to verify the force and motion of the panels and core in each stage of the dynamic model. The result shows that the established deflection surface function can reflect the localization characteristics of panel under close-in blast loading, and the localization of panel decreases constinuously during the deformation process. The panel midpoint deflection and velocity-time curves based on the dynamics model fit well with the numerically calculated results, and the difference between the panel midpoint deflection and the experimental result is small. The dynamics model can be used to effectively predict the dynamic response of PVC foam sandwich panels under close-in blast loading.

Key words: PVC foam sandwich panel, close-in blast loading, dynamic response, dynamic model, numerical calculation

CLC Number:

O383

ZHAO Meng, DAI Kaida, XIANG Zhao, JIANG Tao, ZHAO Xiaosong, XU Yuxin. A Dynamics Model of PVC Foam Sandwich Panels under Close-in Blast Loading[J]. Acta Armamentarii, 2023, 44(12): 3884-3896.

Figures/Tables 19

Fig.1 Fully-clamped PVC foam sandwich panel calculation model

Fig.2 Three stages of the deformation of sandwich panel

Fig.3 Deformation data and fitted curves of panels

Fig.4 Coordinate systems

Fig.5 Schematic diagram of the dynamics model of PVC foam sandwich panel

Fig.6 Procedure of mapping from 2D model to 3D model

Table 1 Johnson-Cook parameters of 304 stainless steel[22]

Johnson-Cook参数	数值	Johnson-Cook参数	数值
ρ/(kg·m^-3)	7900	c	0.07
K/GPa	166.7	m	1
G/GPa	77.0	T_r/K	293
A/MPa	310	T_m/K	1673
B/MPa	1000	ε/s^-1	1
n/	0.65

Table 2 Material properties of PVC foam (H250)[13]

参数	数值	参数	数值
密度/(kg·m^-3)	250	拉伸模量/MPa	320
压缩强度/MPa	7.2	剪切强度/MPa	4.5
压缩模量/MPa	400	剪切模量/MPa	97
拉伸强度/MPa	9.2

Fig.7 Stress-strain curves of PVC foam(H250) under uniaxial compression at different strain rates[13]

Table 3 Finite element modelling conditons[14]

工况	前面板厚度/mm	后面板厚度/mm	夹芯	夹芯厚度/ mm	面板尺寸/ mm	面密度/ (kg·m^-2)
USP-1	1.38	1.38	H250	14	300 × 288	25.17
USP-2	0.9	1.38	H250	14	300 × 288	21.40
USP-3	1.8	1.38	H250	14	300 × 288	28.46
USP-4	1.38	0.9	H250	14	300 × 288	21.40
USP-5	1.38	1.8	H250	14	300 × 288	28.46
USP-6	1.38	1.38	H250	9	300 × 288	23.92
USP-7	1.38	1.38	H250	20	300 × 288	26.67

Fig.8 Comparison between the experimental and numerical deformation/failure patterns of sandwich panel USP-3

Fig.9 Comparisons between the experimental and numerical midpoint deflections of panel

Fig.10 Typical processes of explosion product-structure interaction and panel deformation

Fig.11 Deformation data and fitted curve of USP-1’s front panel at 200μs

Table 4 Fitted results of deformation data

时间/μs	24	42	80	140	200	280
θ	716.0	189.6	57.9	30	17.7	12.1

Fig.12 Velocity-time curve atf the midpoint of USP-1 panel

Fig.13 Velocity-time curve at the midpoint of panel

Fig.14 Comparison of calculated results and finite element simulated results of USP-1

Table 5 Comparison of theoretically calculated and experimental results

况	前面板中点挠度/mm			后面板中点挠度/mm
况	实验结果	计算结果	相对误差/%	实验结果	计算结果	相对误差/%
USP-1	21.74	21.64	0.46	24.56	22.30	9.20
USP-2	26.06	29.14	11.82	26.89	25.60	4.80
USP-3	17.74	18.01	1.52	18.38	20.04	9.03
USP-4	23.52	24.26	3.15	24.62	27.70	12.51
USP-5	21.20	20.09	5.24	20.64	18.88	8.53
USP-6	20.70	22.50	8.70	24.18	24.74	2.32
USP-7	24.00	20.68	13.83	19.08	19.18	0.52

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