Dynamic Mechanical Property Test of Melt Deposited PLA Based on Digital Image Correlation Method

doi:10.19491/j.issn.1001-9278.2021.10.008

Abstract

Abstract:

To study the dynamic mechanical properties of melt deposited poly（lactic acid）（PLA） materials， their dynamic compression experiments were carried out using a split Hopkinson pressure bar （SHPB） experimental device with loading strain rates of 880， 1 230， 1 650 and 2 230 s^-1. The deformation images of PLA materials were obtained under different strain rates using a high frame rate image acquisition instrument. A digital image correlation （DIC） method was adopted to analyze the strain field along the loading direction， and the strain rate analysis was carried out. The results indicated that the melt deposited PLA present elastic， plastic and unloading stages in the deformation process under a dynamic loading. With an increase in strain rate， a significant plastic flow region appears in the plastic stage of PLA， and the compressive strength and maximum strain also tended to increase. The strain distribution in the sample was almost uniform over the whole dynamic impact experiment， and the strain range increased with an increase in strain rate. The strain rate kept almost a constant value during the whole loading process. According to the SHPB experiment， the strain rate error measured by the DIC method was less than 3 %. This indicates that the DIC method can be applied to the SHPB experiment.

Key words: poly（lactic acid）, digital image correlation, split Hopkinson pressure bar, mechanical property

CLC Number:

TQ320.77⁺4

LEI Jingfa, DUAN Huantian, LIU Tao, WEI Zhan, SUN Hong. Dynamic Mechanical Property Test of Melt Deposited PLA Based on Digital Image Correlation Method[J]. China Plastics, 2021, 35(10): 45-50.

Figures/Tables 13

Fig.1. Improved PLA sample shape

Fig.2. Artificial pattern on specimen surface

Fig.3. Experimental system

Fig.4. Stress equilibrium diagram of PLA at strain rate of 880 s-1

Fig.5. Dynamic compressive stress?strain curves of PLA

应变率/s^-1	最大应变	压缩强度/MPa
880	0.069	103.43
1 230	0.099	108.69
1 650	0.130	114.24
2 230	0.176	119.03

Tab.1. Compressive strength and maximum strain of PLA

Fig.6. Strain nephogram of PLA loading direction at strain rate of 880 s-1

Fig.7. Strain?time diagram of PLA at 880 s-1 measured by DIC method

Fig.8. Strain nephogram of PLA in loading direction

Fig.9. Strain?time curves of PLA obtained by DIC method

拟合直线斜率	$R 12$
892	0.995 27
1 208	0.998 87
1 665	0.999 52
2 293	0.998 64

拟合直线斜率	$R 12$
892	0.995 27
1 208	0.998 87
1 665	0.999 52
2 293	0.998 64

Tab.2. Linear fitting data

Fig.10. Strain?time curves measured by the two method

SHPB实验应变率/s^-1	$R 22$	DIC法应变率/s^-1	相对误差/%
880	0.995 12	892	1.36
1 230	0.996 47	1 208	1.79
1 650	0.999 38	1 665	0.91
2 230	0.999 89	2 293	2.83

SHPB实验应变率/s^-1	$R 22$	DIC法应变率/s^-1	相对误差/%
880	0.995 12	892	1.36
1 230	0.996 47	1 208	1.79
1 650	0.999 38	1 665	0.91
2 230	0.999 89	2 293	2.83

Tab.3. Comparison of strain rate measured by the two methods

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