Study on static and dynamic mechanical properties and constitutive model of PVC/TPU blends

doi:10.19491/j.issn.1001-9278.2024.05.001

Abstract

Abstract:

In this study， both universal material testing and high⁃speed tensile testing machines were used to measure the static and dynamic tensile mechanical properties of the poly（vinyl chloride）（PVC）/thermoplastic polyurethane （TPU） blends by using two molding methods and six blending ratios. The molding methods and blending ratios were optimized according to the fracture elongation and Shore hardness of the blends. The stress⁃strain data were obtained in a wide strain⁃rate range of 0.001~700 s^-1， and microscopic characterization was carried out up on the cross⁃section of the tensile samples. The results indicated that the molded material obtained higher fracture elongation， and it achieved maximum fracture elongation at a PVC/TPU mass ratio of 90/10. The Shore hardness meets the hardness range of the soft tissue material of the test dummy （Shore 40~70 A）. The PVC/TPU （90/10） blends exhibited a significant strain⁃rate effect under both static and dynamic loads. The Zhu⁃Wang⁃Tang′s and Sherwood Frost′s equations were employed to construct a constitutive model for the blends， and a comparative investigation indicated that the Sherwood Frost′s equation had better fitting effect. The topography analysis indicated that under static and dynamic loads， the blends exhibited a typical brittle fracture without significant phase separation. As the strain rate increased， the cross⁃section became rough gradually and produced voids and small cracks.

Key words: poly（vinyl chloride）, thermoplastic polyurethane, strain rate, constitutive model

CLC Number:

TQ325.3

LEI Jingfa, HU Jibo, LIU Tao, WU Wenqi, Shen Zhaoyang. Study on static and dynamic mechanical properties and constitutive model of PVC/TPU blends[J]. China Plastics, 2024, 38(5): 1-6.

Figures/Tables 13

References 22

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应变率/s^-1	E₀/MPa	E₁或E₂/MPa	α/MPa	β/MPa	θ₁或θ₂/s	R²/%
0.001	0.047 8	0.778 0	-1.623 2×10^-4	3.654 6×10^-7	6.149	99.83
0.01	0.063 5	5.486 3	-2.393 8×10^-4	5.138 4×10^-7	7.613	99.78
0.1	0.083 3	12.897 6	-3.761 2×10^-4	8.055 2×10^-7	51.485	99.74
100	0.044 2	5 268.966 1	-6.481 4×10^-5	3.405 4×10^-8	1×10^-6	99.12
400	0.057 0	8 117.692 4	-1.025 7×10^-4	5.827 5×10^-8	1.233 9×10^-6	94.58
700	0.134 8	32 744.138 8	-4.314 6×10^-4	4.386 7×10^-7	1.010 2×10^-6	98.18

应变率/s^-1	E₀/MPa	E₁或E₂/MPa	α/MPa	β/MPa	θ₁或θ₂/s	R²/%
0.001	0.047 8	0.778 0	-1.623 2×10^-4	3.654 6×10^-7	6.149	99.83
0.01	0.063 5	5.486 3	-2.393 8×10^-4	5.138 4×10^-7	7.613	99.78
0.1	0.083 3	12.897 6	-3.761 2×10^-4	8.055 2×10^-7	51.485	99.74
100	0.044 2	5 268.966 1	-6.481 4×10^-5	3.405 4×10^-8	1×10^-6	99.12
400	0.057 0	8 117.692 4	-1.025 7×10^-4	5.827 5×10^-8	1.233 9×10^-6	94.58
700	0.134 8	32 744.138 8	-4.314 6×10^-4	4.386 7×10^-7	1.010 2×10^-6	98.18

应变率/s^-1	A₁	A₂	A₃	C	R²/%
0.001	0.294 0	-5.049 6×10^-4	5.009 3×10^-6	-0.173 0	99.95
0.01	0.278 3	-4.079 2×10^-4	3.216 8×10^-6	-0.204 7	99.98
0.1	0.307 7	-7.978 7×10^-4	3.916 7×10^-6	-0.259 1	99.99
100	0.088 0	-1.041 6×10^-4	1.286 2×10^-7	-0.863 0	98.57
400	0.050 1	-7.414 1×10^-5	8.378 7×10^-8	-1.993 0	99.44
700	0.040 3	-9.126 4×10^-5	1.121 3×10^-7	-3.761 1	99.70

应变率/s^-1	A₁	A₂	A₃	C	R²/%
0.001	0.294 0	-5.049 6×10^-4	5.009 3×10^-6	-0.173 0	99.95
0.01	0.278 3	-4.079 2×10^-4	3.216 8×10^-6	-0.204 7	99.98
0.1	0.307 7	-7.978 7×10^-4	3.916 7×10^-6	-0.259 1	99.99
100	0.088 0	-1.041 6×10^-4	1.286 2×10^-7	-0.863 0	98.57
400	0.050 1	-7.414 1×10^-5	8.378 7×10^-8	-1.993 0	99.44
700	0.040 3	-9.126 4×10^-5	1.121 3×10^-7	-3.761 1	99.70

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