圆片小冲杆试验新方法与航空材料力学性能互换

doi:10.7527/S1000-6893.2023.28708

Abstract

Abstract:

For the small punch test with the advantage of slightly damaged sampling， a theoretical model was derived based on the energy density equivalence principle to describe the relationships among the load， displacement， geometric size， and uniaxial mechanical law parameters. A novel small punch test method was then proposed for aerospace materials to convert mechanical properties between uniaxial tensile test results and small punch test results. Small punch tests and uniaxial tensile tests were carried out on five aerospace materials. The results show that the stress-strain curves obtained by the new method were in close agreement with those obtained by uniaxial tensile tests； the relative errors of the elastic moduli obtained by the new method results and the uniaxial tensile test results were within 10%； and the relative errors of the yield strengths and tensile strengths obtained by the two methods were mostly within 5%. The proposed method is expected to promote the application of SPT for the safety evaluation of in-service structures.

Key words: small punch test, energy density equivalence, stress-strain relationship, strength, testing method

CLC Number:

V219

Jitao LI, Guangzhao HAN, Jun XIONG, Tian ZHOU, Lixun CAI. Novel small punch testing method and its application to conversion of mechanical properties for aerospace materials[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(3): 428708.

Figures/Tables 13

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Table 1

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材料	k₁	k₂	k₃	k₄
铝合金	4.952	0.690 1	0.222 9	0.749 1
钢材	3.344	0.353 8	0.313 5	0.968 2

材料	c₀₀	c₀₁	c₁₀	c₁₁	c₂₀	c₂₁
铝合金	-1.032	139.4	3.566	-341.6	-1.786	234.6
钢材	-0.247 9	63.92	1.785	-152.1	-0.661 0	96.84

材料	弹性模量 E/GPa	塑性延伸强度R_p0.2/MPa	抗拉强度 R_m/MPa
2124-T851	71.1	444	485
7050-T7451	71.1	490	551
30CrMnSi	203.4	333	655
R30CrMnSi	197.7	1 033	1 137
A100	184.2	912	1 216

材料	试样	强化系数K/MPa	硬化指数n	弹性模量		塑性延伸强度		抗拉强度
材料	试样	强化系数K/MPa	硬化指数n	E/GPa	误差/%	R_p0.2/MPa	误差/%	R_m/MPa	误差/%
2124-T851	#1	665.1	0.090 4	74.5	3.8	451.6	1.7	494.6	2.0
	#2	675.8	0.092 8	77.7	8.3	439.3	1.1	515.6	6.3
	#3	691.0	0.105	76.9	7.0	435.2	2.0	502.7	3.7

7050-T7451	#1	769.3	0.109	70.6	1.8	501.3	2.5	553.2	1.0
	#2	743.4	0.086 8	73.3	2.0	492.6	0.7	557.1	1.7
	#3	754.4	0.091 4	73.5	2.2	482.1	1.4	555.2	1.4

30CrMnSi	#1	1204	0.233	186.7	8.2	331.0	0.7	661.8	1.8
	#2	1244	0.247	186.2	8.4	326.8	2.0	679.0	4.5
	#3	1181	0.224	198.0	2.6	322.6	3.3	683.5	5.2

R30CrMnSi	#1	1505	0.073 4	199.6	1.0	1 049	2.1	1 155	2.3
	#2	1542	0.086 7	187.3	5.2	1 002	2.5	1 138	0.7
	#3	1575	0.085 3	192.0	2.9	1 067	3.8	1 145	1.3

A100	#1	1903	0.136	172.9	6.1	974.2	0.1	1 257	2.6
	#2	1861	0.129	178.1	3.3	985.0	1.2	1 250	2.0
	#3	1884	0.128	179.5	2.5	1 005	3.4	1 270	3.7

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Novel small punch testing method and its application to conversion of mechanical properties for aerospace materials

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