Prediction of mechanical properties of polyethylene based on punch tests

doi:10.19491/j.issn.1001-9278.2022.01.004

Abstract

Abstract:

In this paper， monotonic tensile tests were first conducted using five high?density polyethylene （PE?HD） round bar specimens with different notch radii to study the effects of notch radius on the curves of engineering stress?displacement curves. Moreover， punch tests were also conducted on the PE?HD plate specimens to investigate the load?displacement curves with an indenter diameter and a punch speed. Finally， three empirical equations for the prediction of yield stress of PE?HD materials based on characteristic punch load were proposed. The results indicated that the yield stress obtained from the monotonic tensile tests increased with a decrease in notch radius at the same loading speed. Additionally， the maximum punch load increased with an increase in the indenter diameter or punch speed. The predicted yield stress based on the empirical equation is closest to the tensile test result when using the indenter diameter as variable.

Key words: high density polyethylene, punch test, uniaxial tensile test, yield strength, maximum punch load

CLC Number:

TQ325.1⁺2

CHANG Pin, ZHANG Yi, SUN Feng, QIAO Liang, FAN Junming. Prediction of mechanical properties of polyethylene based on punch tests[J]. China Plastics, 2022, 36(1): 25-31.

Figures/Tables 11

Fig.1. PE?HD round bar specimens

Fig.2. Schematic diagram of punch test device

Fig.3. Engineering stress?displacement curves of notched round bar specimens

圆棒试样类型	中心处直径/mm	屈服强度/MPa
光滑圆棒	6.00	21.67
R20	5.97	24.84
R5	5.77	26.67
R2	5.80	30.54
R0.5	5.84	33.34

Tab.1. Mechanical parameters of uniaxial tensile test

Fig.4. Load?displacement curves from punch tests with different indenter diameters

Fig.5. Load?displacement curves from punch tests at different punch speeds

压头直径/mm	最大冲压载荷/N	最大冲压载荷下的位移/mm
4	616.57	2.37
6	948.03	2.99
8	1 257.47	3.20
10	1 621.43	3.09

Tab.2. Mechanical parameters of punch test

Fig.6. Curves of the relationship between the maximum punch load and different variables

试样类型	$σ y = F p - B 1 / A 1 d$		$σ y = F p - B 2 / A 2 d 2$		$σ y = F p - B 3 / A 3 d δ$
试样类型	A₁	B₁	A₂	B₂	A₃	B₃
光滑圆棒	7.67	-52.53	0.54	478.35	2.11	153.47
R20	6.69	-52.53	0.47	478.35	1.84	153.47
R5	6.23	-52.53	0.44	478.35	1.71	153.47
R2	5.44	-52.53	0.38	478.35	1.49	153.47
R0.5	4.99	-52.53	0.35	478.35	1.37	153.47

试样类型	$σ y = F p - B 1 / A 1 d$		$σ y = F p - B 2 / A 2 d 2$		$σ y = F p - B 3 / A 3 d δ$
试样类型	A₁	B₁	A₂	B₂	A₃	B₃
光滑圆棒	7.67	-52.53	0.54	478.35	2.11	153.47
R20	6.69	-52.53	0.47	478.35	1.84	153.47
R5	6.23	-52.53	0.44	478.35	1.71	153.47
R2	5.44	-52.53	0.38	478.35	1.49	153.47
R0.5	4.99	-52.53	0.35	478.35	1.37	153.47

Tab.3. Undetermined coefficients of three empirical formulas

Fig.7. Yield strength of PE?HD at different notch radii obtained from the three empirical formulas

PE?HD类型	关联式（2）的标准差	关联式（6）的标准差	关联式（7）的标准差
光滑圆棒	0.22	3.62	1.28
R20	0.25	4.15	1.46
R5	0.28	4.47	1.59
R2	0.32	5.09	1.83
R0.5	0.34	5.57	1.97

Tab.4. Standard deviation of yield strength for different types of PE?HD

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