Analysis of influence factors on mechanical properties of epoxy/carbon fiber composite⁃molded products

doi:10.19491/j.issn.1001-9278.2024.02.005

Abstract

Abstract:

The influence of molding process parameters on the mechanical properties of carbon fiber/epoxy sheet⁃molded products was studied through orthogonal experiments， and the influence trend of various process parameters on their tensile strength and flexural strength was analyzed. The influence of process parameters on the tensile strength was obtained by variance analysis in an increasing order of ： clamping speed > molding temperature > molding pressure > holding time， and the influence of process parameters on bending strength was obtained in an increasing order of： clamping speed > molding pressure > molding temperature>holding time. Moreover， the significance factors affecting the tensile strength and flexural strength were also obtained. The tensile failure mode and failure mechanism were studied， and the typical samples were selected for observation using the K⁃mean method. The results indicated that the bonding degree between the matrix and epoxy resin affected the tensile strength of the molding products.

Key words: epoxy/carbon fiber sheet molding compound, molded product, mechanical property, orthogonal experiment, failure mechanism

CLC Number:

TQ323.5

ZHAO Chuantao, JIA Zhixin, LIU Lijun, LI Jiqiang, ZHANG Chenchen, RONG Di, GAO Lizhen, WANG Shaofeng. Analysis of influence factors on mechanical properties of epoxy/carbon fiber composite⁃molded products[J]. China Plastics, 2024, 38(2): 26-32.

Figures/Tables 14

水平	因素
水平	模压温度/ ℃	模压压力/ kN	保压时间/ s	合模速度/ mm∙s^-1	空列
1	130	400	540	1	1
2	140	500	600	5	2
3	150	600	660	10	3
4	160	700	720	15	4

Tab.1. Factor level table of the orthogonal test

Fig.1. Specimen cutting scheme

编号	模压温度/℃	模压压力/kN	保压时间/s	合模速度/mm∙s^-1	$σ t$ /MPa	$σ f$ /MPa	$R t$	$R f$
1	130	400	540	1	182.48	275.61	21.63	22.52
2	130	500	600	5	156.06	387.57	15.64	17.45
3	130	600	660	10	156.28	302.50	16.16	15.89
4	130	700	720	15	158.45	300.35	21.47	16.63
5	140	400	600	10	181.65	299.80	13.54	21.32
6	140	500	540	15	164.06	346.02	14.07	22.03
7	140	600	720	1	189.82	362.57	11.10	19.68
8	140	700	660	5	166.06	404.22	19.32	15.19
9	150	400	660	15	172.23	329.27	21.48	20.36
10	150	500	720	10	175.98	358.85	19.01	19.95
11	150	600	540	5	162.92	382.68	13.46	22.23
12	150	700	600	1	180.00	286.02	15.01	17.59
13	160	400	720	5	175.32	350.53	19.24	16.49
14	160	500	660	1	177.82	362.54	14.32	18.02
15	160	600	600	15	166.23	345.46	21.32	10.03
16	160	700	540	10	162.07	273.78	16.89	17.70

编号	模压温度/℃	模压压力/kN	保压时间/s	合模速度/mm∙s^-1	$σ t$ /MPa	$σ f$ /MPa	$R t$	$R f$
1	130	400	540	1	182.48	275.61	21.63	22.52
2	130	500	600	5	156.06	387.57	15.64	17.45
3	130	600	660	10	156.28	302.50	16.16	15.89
4	130	700	720	15	158.45	300.35	21.47	16.63
5	140	400	600	10	181.65	299.80	13.54	21.32
6	140	500	540	15	164.06	346.02	14.07	22.03
7	140	600	720	1	189.82	362.57	11.10	19.68
8	140	700	660	5	166.06	404.22	19.32	15.19
9	150	400	660	15	172.23	329.27	21.48	20.36
10	150	500	720	10	175.98	358.85	19.01	19.95
11	150	600	540	5	162.92	382.68	13.46	22.23
12	150	700	600	1	180.00	286.02	15.01	17.59
13	160	400	720	5	175.32	350.53	19.24	16.49
14	160	500	660	1	177.82	362.54	14.32	18.02
15	160	600	600	15	166.23	345.46	21.32	10.03
16	160	700	540	10	162.07	273.78	16.89	17.70

Tab.2. Orthogonal experimental protocol and results

因素	偏差平方和	自由度	方差	F	显著性
模压温度/℃	323.029	3	107.676	10.665	0.041
模压压力/kN	307.265	3	102.422	10.144	0.044
保压时间/s	128.619	3	42.873	4.246	0.133
合模速度/mm∙s^-1	815.456	3	271.819	26.922	0.011
误差	30.290	3	10.097	—	—

Tab.3. Analysis of variance of orthogonal experiments on tensile strength

因素	偏差平方和	自由度	方差	F	显著性
模压温度/℃	2 767.279	3	922.426	2.147	0.273
模压压力/kN	7 235.748	3	2 411.916	5.614	0.095
保压时间/s	2 183.195	3	727.732	1.694	0.338
合模速度/mm·s^-1	12 111.106	3	4 037.035	9.396	0.049
误差	1 288.911	3	429.637	—	—

Tab.4. Analysis of variance for orthogonal experiments on flexural strength

工艺参数	水平	个案数	拉伸强度（A）		弯曲强度（B）
工艺参数	水平	个案数	均值	显著性	均值	显著性
模压温度/℃	130	4	163.32	0.052	316.51	0.086
	160	4	170.36	0.052	333.08	0.086
	150	4	172.78	0.111	339.21	0.086
	140	4	175.39	0.111	353.15	0.086
模压压力/kN	700	4	166.65	0.403	316.10	0.100
	500	4	168.48	0.403	363.75	0.369
	600	4	168.81	0.403	348.31	0.100
	400	4	177.92	1.000	313.80	0.100
保压时间/s	540	4	167.88	0.052	319.53	0.129
	660	4	168.10	0.052	349.64	0.129
	600	4	170.98	0.052	329.72	0.129
	720	4	174.89	0.052	343.08	0.129
合模速度/mm·s^-1	5	4	165.09	0.180	381.25	1.000
	15	4	165.24	0.180	330.28	0.237
	10	4	168.99	0.180	308.74	0.237
	1	4	182.53	1.000	321.69	0.237

Tab.5. Duncan multiple comparisons of effects of each process parameter on tensile and flexural strength

Fig.2. Variation of tensile strength and bending strength with each process parameter

Fig.3. Average profile coefficient under different K values

Fig.4. Profile values of the samples under different clusters

Fig.5. Cluster analysis results

簇内样本	模压温度/℃	模压压力/kN	保压时间/s	合模速度/mm·s^-1	A板拉伸强度/MPa	B板拉伸强度/MPa
样本4	130	70	720	15	128.70	188.20
样本10	150	50	720	10	173.13	178.83

Tab.6. Process parameters and tensile strength of the clustered samples

Fig.6. Stress⁃strain curves of the tensile specimens

Fig.7. Typical tensile specimen break section

Fig.8. Comparison of the section topography

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