两种方法评价管材力学性能的研究

doi:10.15541/jim20150410

无机材料学报 ›› 2016, Vol. 31 ›› Issue (2): 213-219.DOI: 10.15541/jim20150410

两种方法评价管材力学性能的研究

刘钊¹, 包亦望¹, 万德田¹, 胡春林², 马德隆¹, 田远¹

(1. 中国建筑材料科学研究总院绿色建材国家重点实验室, 北京 100024; 2. 武汉理工大学土木工程与建筑学院, 武汉 430070)

收稿日期:2015-08-31 修回日期:2015-09-25 出版日期:2016-02-20 网络出版日期:2016-01-15
作者简介:刘钊. E-mail: liuzhao7945@163.com

Investigation on Two Methods for Evaluating Mechanical Properties of Tube Materials

LIU Zhao¹, BAO Yi-Wang¹, WAN De-Tian¹, HU Chun-Lin², MA De-Long¹, TIAN Yuan¹

(1. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China; 2. Department of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China)

Received:2015-08-31 Revised:2015-09-25 Published:2016-02-20 Online:2016-01-15
About author:LIU Zhao (1989–), male, candidate of Master degree. E-mail: liuzhao7945@163.com
Supported by:
National Natural Science Foundation of China (51172221, 51472227);Major Program of Scientific Instrument and Equipment Development of China (2011YQ140145);National High Technology Research and Development Program of China (863 Program, 2015AA034204)

摘要/Abstract

摘要：

通过挤压一个缺口环或闭口环样品来评价不同管材的弹性模量和弯曲强度。在弹性范围内, 弹性模量可由载荷—位移关系和样品尺寸获到; 而弯曲强度则由断裂临界载荷决定。在本研究中, 四种管材被分为两组来研究这两种方法的适用范围。结果表明: 缺口环适合评价刚度较大、极限应变较小的材料, 而闭口环则更倾向于评价低刚度的材料。此外, 三点弯曲的数据也验证了这两种方法的有效性、便捷性及其各自的适用范围。

关键词: 弹性模量, 弯曲强度, 缺口环, 闭口环, 管材

Abstract:

Elastic modulus and bending strength of tube materials were evaluated via compressing a split ring sample or a closed ring sample for different materials. Elastic modulus was estimated from the load-displacement relationship and sample dimensions in the range of elasticity, while bending strength was derived through the critical load at fracture. In this work, four tube materials were divided in two groups to research the applicable scopes of two methods. The results indicate that the split ring is suitable for materials with high brittleness and low limit strain, while the closed ring is available for low-stiffness materials. Comparison with the three-point bending data demonstrated the validity and convenience of two methods with the respective applicable range.

Key words: elastic modulus, bending strength, split ring, closed ring, tube materials

中图分类号:

TQ174

刘钊, 包亦望, 万德田, 胡春林, 马德隆, 田远. 两种方法评价管材力学性能的研究[J]. 无机材料学报, 2016, 31(2): 213-219.

LIU Zhao, BAO Yi-Wang, WAN De-Tian, HU Chun-Lin, MA De-Long, TIAN Yuan. Investigation on Two Methods for Evaluating Mechanical Properties of Tube Materials[J]. Journal of Inorganic Materials, 2016, 31(2): 213-219.

图/表 13

Fig. 1 Schematic of the split ring before and during loading

Fig. 2 Schematic of the closed ring before and during loading

Fig. 3 Schematic of the longitudinal symmetry section at stress point B

Table 1 Components, physical properties and dimensions of four testing tube materials

Sample	Gradients & Contents /%	Density /(g·cm^-3)	Thermal expansion coefficient /(×10^-6, K^-1)	Thermal conductivity /(W·m^-1·K^-1)	Size/mm
Sample	Gradients & Contents /%	Density /(g·cm^-3)	Thermal expansion coefficient /(×10^-6, K^-1)	Thermal conductivity /(W·m^-1·K^-1)	R	r
Alumina	Al₂O₃: 99.70	3.67	8.60	25.00	15	12
Quartz glass	SiO₂: 99.95	2.26	0.55	41.00	24	21
Graphite	C: 99.92	1.83	4.30	106.00	15	12
PMMA	PMMA: 100.00	1.18	85.00	0.19	18	15

Fig. 4 Photograph of testing samples used in this work

Table 2 Loading speeds for modulus test and strength test

Loading speed /(mm·min^-1)	Alumina		Quartz glass		Graphite		PMMA
Loading speed /(mm·min^-1)	E	σ	E	σ	E	σ	E	σ
Split ring test (C)	0.10	0.5	0.10	0.5	0.2	1.0	0.5	2.5
Closed ring test (O)	0.02	0.1	0.04	0.2	0.1	0.5	0.4	2.0
Three-point bending test (3)	0.02	0.1	0.04	0.2	0.1	0.5	0.4	2.0

Fig. 5 Elastic modulus of high-stiffness group measured by three methods

Table 3 The ratio of modulus for four tube materials

Sample	Alumina	Quartz glass	Graphite	PMMA
E_c/E₃	1.003	1.007	1.024	1.095
E_o/E₃	0.898	0.956	1.014	1.007

Fig. 6 Elastic modulus of low-stiffness group measured by three methods

Fig. 7 Bending strength of high-stiffness group measured by three methods

Table 4 The ratio of the ultimate strain for four tube materials

Sample	Alumina	Quartz glass	Graphite	PMMA
ε_bc/ε_b3	0.955	0.996	0.910	-
ε_bo/ε_b3	1.027	1.012	0.992	0.843

Fig. 8 Bending strength of low-stiffness group measured by three methods

Fig. 9 The relationship between εb3 and εb/εb3 for both methods

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两种方法评价管材力学性能的研究

Investigation on Two Methods for Evaluating Mechanical Properties of Tube Materials

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