划痕缺陷对30Ni4CrMoA试样疲劳寿命影响的试验与理论模型

doi:10.7527/S1000-6893.2024.30743

Abstract

Abstract:

The smooth samples of 30Ni4CrMoA high strength structural steel and the test parts with depth scratch defects of different depths were prepared， and the fatigue life of the test parts with scratch defects of different depths and different stress levels were obtained. Based on the theory of continuous damage mechanics and the original high-cycle fatigue damage evolution equation， an expression for influence of scratch coefficient was proposed， which comprehensively considered the influences of scratch depth and stress level， according to the relationship between the maximum stress analysis at scratch root and scratch depth， as well as the change law of sample fatigue life with scratch depth and stress level. A new equivalent fatigue damage evolution equation considering the effects of scratches was established. Based on this equation， the fatigue life of 30Ni4CrMoA sample with scratches can be predicted by the closed solution directly according to the fatigue life expression in the integral form， without establishing the finite element model of scratches. The theoretical prediction results are in good agreement with the experimental results， which verifies the effectiveness and applicability of the proposed method. Finally， the relationship between the scratch influence coefficient and notch fatigue coefficient and the influence of stress gradient at scratch root were discussed.

Key words: scratch defect, fatigue, life prediction, 30Ni4CrMoA high-strength structural steel, continuous damage mechanics

CLC Number:

V215.5

Mengwei ZHANG, Weiping HU, Haibin XU, Zhanqi MA, Zhixin ZHAN, Qingchun MENG. Experimental and theoretical model study on influence of scratch defects on fatigue life of 30Ni4CrMoA sample[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(3): 230743.

Figures/Tables 33

Fig.1

Fig.2

Table 1

Table 2

Shaping constitutive parameter of 30Ni4CrMoA

$C 1$	$C 2$	$C 3$	$γ 1$	$γ 2$	$γ 3$
811 501.2	78 372.9	4 902.37	414 929.4	864.878	95.986

Table 2

Fig.3

Fig.4

Table 3

Table 4

S-N curve parameters of standard smooth parts

S-N曲线	C	A	$α$	疲劳极限/MPa
式（18）	1	0.057 79	0.519 5	715
式（19）	1	0.057 79	0.519 5	322

Table 4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Table 5

Table 6

S-N curve parameters of 0.25 mm scratch defect sample

C	A	$α$	S_∞ /MPa
1	0.000 355 1	2.239	476

Table 6

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

Fig.16

Table 7

Scratch influence coefficient of defects with different scratch depths

h/mm	S_max/MPa	$N 50 / 104$	k
0.25	600	5.413 3	1.49
0.25	550	6.097 8	1.60
0.25	525	8.617 7	1.65
0.1	820	6.817 7	1.07
0.1	785	8.558 2	1.10
0.4	450	8.263 9	1.93
0.4	400	25.189 3	2.0

Table 7

Fig.17

Fig.18

Table 8

Parameters of fatigue damage

$1 α (1 + β) / M P a m$	$n / M P a - 1$	$m$
5.271 1×10⁴⁰	1×10^-5	13.813 387

Table 8

Table 9

Table 10

Fig.19

Table 11

Table 12

Fig.20

Table 13

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划痕深度/mm	疲劳极限/MPa	疲劳缺口系数
0.1	710	1.007 0
0.25	476	1.502
0.4	397	1.801

划痕深度/mm	应力集中系数	疲劳缺口系数	划痕影响系数
0.1	2.29	1.007 0	1.08
0.25	3.03	1.502	1.60
0.4	3.59	1.801	2.0

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Experimental and theoretical model study on influence of scratch defects on fatigue life of 30Ni4CrMoA sample

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划痕深度/mm	S_max/MPa	N/10⁴	N₅₀/10⁴
0.25	600	5.32 8.41 4.41 4.67	5.413 3
	550	4.15 7.31 7.11 6.41	6.097 8
	525	7.59 15.13 5.27 9.75 8.03	8.617 7
0.4	450	8.47 7.65 8.71	8.263 9
0.4	400	8.69 14.29 9.73 89.93 100	25.189 3
0.1	820	6.27 6.53 7.74	6.817 7
0.1	785	8.04 9.11	8.558 2

划痕深度/mm	应力水平/MPa	计算寿命/10⁴	中值寿命/10⁴
0.1	820	7.26	6.817 7
0.1	785	8.2	8.558 2
0.4	450	5.87	8.263 9
0.4	400	27.0	25.189 3