Effects of γ-Ray Irradiation on the Fatigue Strength, Thermal Conductivities and Thermal Stabilities of the Glass Fibres/Epoxy Resins Composites

doi:10.1007/s40195-017-0692-2

Abstract

Abstract:

Glass fibres/epoxy resins composites have been performed as ideal materials to make support instruments for high-energy and nuclear physics experiments. The effects of the γ-ray irradiation on the fatigue strength, thermal conductivities and thermal stabilities of the glass fibres/epoxy resins composites were investigated. And a two-parameter fatigue life model was established to predict the fatigue life of the composites. Results revealed that the γ-ray irradiation could probably result in the degradation of epoxy resins, but hardly damage to the glass fibres. And the γ-ray irradiation treatment could significantly affect the fatigue strength of the composites at a low-cycle fatigue stage, but seldom influence at a high-cycle fatigue stage. Furthermore, the fabricated glass fibres/epoxy resins composites after the γ-ray irradiation still presented excellent fatigue strength, ideal thermal conductivities, remarkable dimensional and thermal stabilities, which can meet the actual requirements of normal operation for supporting instruments under high-energy and nuclear physics experiments.

Key words: Epoxy resins composites, Glass fibres, Fatigue strength, γ-Ray irradiation, Thermal stabilities

Li-Fang Zheng, Lu-Ning Wang, Zhao-Zhong Wang, Li Wang. Effects of γ-Ray Irradiation on the Fatigue Strength, Thermal Conductivities and Thermal Stabilities of the Glass Fibres/Epoxy Resins Composites[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(1): 105-112.

Figures/Tables 9

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Irradiation dose (kGy)	Mean static tensile strength (MPa)	Stress level, r (%)	Mean stress, σ _m(MPa)	Stress amplitude, σ_a (MPa)	Fatigue cycle number, N (cycle)	ln(1 - r)	ln N
0	190.63	80	83.60	68.40	526.75	- 1.6094	6.2667
		60	62.70	51.30	4569	0.9163	8.4271
		55	57.48	47.03	8209	0.7985	9.0130
		40	41.80	34.20	243,162	0.5108	12.4015
20	184.50	80	81.40	66.60	954	- 1.6094	6.8607
		60	61.05	49.95	5852	- 0.9163	8.6745
		55	55.96	45.79	13,188	- 0.7985	9.4871
		40	40.70	33.30	353,245	- 0.5108	12.7749
100	182.99	80	79.20	64.80	1091.25	- 1.6094	6.9951
		60	59.40	48.60	6637	- 0.9163	8.8004
		55	54.45	44.55	14,973	- 0.7985	9.6140
		40	39.60	32.40	467,244	- 0.5108	13.0546
200	176.14	80	77.44	63.36	1166	- 1.6094	7.0613
		60	58.08	47.52	8337	- 0.9163	9.0285
		55	53.24	43.56	16,970	- 0.7985	9.7392
		40	38.72	31.68	600,128	- 0.5108	13.3049

Irradiation dose (kGy)	Mean static tensile strength (MPa)	Stress level, r (%)	Mean stress, σ _m(MPa)	Stress amplitude, σ_a (MPa)	Fatigue cycle number, N (cycle)	ln(1 - r)	ln N
0	190.63	80	83.60	68.40	526.75	- 1.6094	6.2667
		60	62.70	51.30	4569	0.9163	8.4271
		55	57.48	47.03	8209	0.7985	9.0130
		40	41.80	34.20	243,162	0.5108	12.4015
20	184.50	80	81.40	66.60	954	- 1.6094	6.8607
		60	61.05	49.95	5852	- 0.9163	8.6745
		55	55.96	45.79	13,188	- 0.7985	9.4871
		40	40.70	33.30	353,245	- 0.5108	12.7749
100	182.99	80	79.20	64.80	1091.25	- 1.6094	6.9951
		60	59.40	48.60	6637	- 0.9163	8.8004
		55	54.45	44.55	14,973	- 0.7985	9.6140
		40	39.60	32.40	467,244	- 0.5108	13.0546
200	176.14	80	77.44	63.36	1166	- 1.6094	7.0613
		60	58.08	47.52	8337	- 0.9163	9.0285
		55	53.24	43.56	16,970	- 0.7985	9.7392
		40	38.72	31.68	600,128	- 0.5108	13.3049

Irradiation dose (kGy)	c ₁	B ₁	Two-parameter fatigue life model	N (Cycle)
0	0.3022	32.98622	N = [32.98622335(1 - r)]^1/0.30220	< 10⁴
20	0.32103	44.06783	N = [44.06782833(1 - r)]^1/0.32103
100	0.32197	46.29898	N = [46.29898321(1 - r)]^1/0.32197
200	0.31341		N = [44.98998907(1 - r)]^1/0.31341
Irradiation dose (kGy)	c ₂	B ₂	Two-parameter fatigue life model	N (Cycle)
0	0.09025	5.153108	N = [5.153107857(1 - r)]^1/0.09025	≥ 10⁴
20	0.09362	5.513998	N = [5.513998276(1 - r)]^1/0.09362
100	0.09587	5.740292	N = [5.740291540(1 - r)]^1/0.09587
200	0.09801	5.987476	N = [5.987476273(1 - r)]^1/0.09801

Irradiation dose (kGy)	c ₁	B ₁	Two-parameter fatigue life model	N (Cycle)
0	0.3022	32.98622	N = [32.98622335(1 - r)]^1/0.30220	< 10⁴
20	0.32103	44.06783	N = [44.06782833(1 - r)]^1/0.32103
100	0.32197	46.29898	N = [46.29898321(1 - r)]^1/0.32197
200	0.31341		N = [44.98998907(1 - r)]^1/0.31341
Irradiation dose (kGy)	c ₂	B ₂	Two-parameter fatigue life model	N (Cycle)
0	0.09025	5.153108	N = [5.153107857(1 - r)]^1/0.09025	≥ 10⁴
20	0.09362	5.513998	N = [5.513998276(1 - r)]^1/0.09362
100	0.09587	5.740292	N = [5.740291540(1 - r)]^1/0.09587
200	0.09801	5.987476	N = [5.987476273(1 - r)]^1/0.09801