Dynamic Mechanical Behavior and Dynamic Constitutive Model of Fused Deposition PLA Materials

doi:10.19491/j.issn.1001-9278.2020.11.011

Abstract

Abstract:

To analyze the static and dynamic mechanical properties of an additive manufacturing fused deposition molding material， poly（lactic acid）（PLA）， at low and high strain rates， MTS material testing machine and split Hopkinson pressure bar （SHPB） device were adopted severally to carried out the static and dynamic mechanical measurements at three printing speeds of 40， 80， and 120 mm/s under low-strain-rate and high?strain?rate loading conditions. The surface morphology of the prepared specimens was also observed. The results indicated that the elastic modulus and yield stress of PLA increased significantly with an increase of strain rate. Microscopic morphological analysis indicated that the PLA material exhibited fewer defects at a printing speed of 80 mm/s. At the same strain rate， the elastic modulus and yield stress of the material obtained at this printing speed were significantly higher than those at the printing speeds of 40 and 120 mm/s. The PLA material presented obvious elasticity and plasticity stages under the static load， and the plastic segment exhibited a strain-softening phenomenon. On the other hand， the PLA material showed significant viscoelastic characteristics under the dynamic load. The ZWT model was used to establish the viscoelastic constitutive model for the PLA material， and the fitting curve obtained from this constitutive model was in good agreement with the experimental curve.

Key words: poly（lactic acid）, strain rate, split Hopkinson pressure bar, fused deposition molding

CLC Number:

TQ321

LEI Jingfa, WEI Zhan, LIU Tao , SUN Hong , DUAN Huantian . Dynamic Mechanical Behavior and Dynamic Constitutive Model of Fused Deposition PLA Materials[J]. China Plastics, 2020, 34(11): 59-65.

Figures/Tables 8

References 19

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类型	E₀/MPa	E₁/MPa	α/MPa	β/MPa	E₂/MPa	θ/μs	R²/%
40 mm/s-1 000 s^-1	-2 677	4 651	-7 389	-67 030	367.1	5.809	99.63
40 mm/s-1 500 s^-1	10 127.5	-7177.8	-27 830	84 235.7	28 328.4	2.3×10^-7	99.5
40 mm/s-2 000 s^-1	-136.19	2 895.77	-25 280	73 633.2	235 717	5.7×10^-8	98.79
80 mm/s-1 000 s^-1	-14 17695	1 421231	-38 099.8	110 105.2	97 472.53	1.93×10^-7	99.65
80 mm/s-1 500 s^-1	1 112.44	2 060.59	-36 138	131 990	64 376.6	3.6×10^-7	98.64
80 mm/s-2 000 s^-1	4 208.89	-905.70	-33 890	106 841	23 9942	7.4×10^-8	98.56
120 mm/s-1 000 s^-1	2 815.57	114.408	-31 586	99 675.4	83 190.1	1.8×10^-7	99.65
120 mm/s-1 500 s^-1	5 557.66	-2 284.71	-34 226.5	11 2313	92 171.7	1.1×10^-7	99.35
120 mm/s-2 000 s^-1	-0.108 99	2967	-28 301.7	84 554.5	49 304.96	2.89×10^-7	98.73

类型	E₀/MPa	E₁/MPa	α/MPa	β/MPa	E₂/MPa	θ/μs	R²/%
40 mm/s-1 000 s^-1	-2 677	4 651	-7 389	-67 030	367.1	5.809	99.63
40 mm/s-1 500 s^-1	10 127.5	-7177.8	-27 830	84 235.7	28 328.4	2.3×10^-7	99.5
40 mm/s-2 000 s^-1	-136.19	2 895.77	-25 280	73 633.2	235 717	5.7×10^-8	98.79
80 mm/s-1 000 s^-1	-14 17695	1 421231	-38 099.8	110 105.2	97 472.53	1.93×10^-7	99.65
80 mm/s-1 500 s^-1	1 112.44	2 060.59	-36 138	131 990	64 376.6	3.6×10^-7	98.64
80 mm/s-2 000 s^-1	4 208.89	-905.70	-33 890	106 841	23 9942	7.4×10^-8	98.56
120 mm/s-1 000 s^-1	2 815.57	114.408	-31 586	99 675.4	83 190.1	1.8×10^-7	99.65
120 mm/s-1 500 s^-1	5 557.66	-2 284.71	-34 226.5	11 2313	92 171.7	1.1×10^-7	99.35
120 mm/s-2 000 s^-1	-0.108 99	2967	-28 301.7	84 554.5	49 304.96	2.89×10^-7	98.73

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