内压、弯扭耦合载荷下连续管疲劳寿命评估

周浩; 刘少胡; 管锋

doi:10.11858/gywlxb.20180611

内压、弯扭耦合载荷下连续管疲劳寿命评估

doi: 10.11858/gywlxb.20180611

长江大学机械工程学院，湖北荆州　434023

基金项目: 国家自然科学基金（51604039）；长江大学长江青年科技创新团队基金（2016CQT01）；长江大学青年基金（2015CQN44）

详细信息

作者简介:
周　浩（1995－），男，硕士研究生，主要从事连续管装备研究. E-mail：zhjs0210@126.com

通讯作者:
刘少胡（1984－），男，博士，副教授，主要从事连续管疲劳寿命评估研究. E-mail：liushaoh@126.com

中图分类号: TE925
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出版历程
- 收稿日期: 2018-08-08
- 修回日期: 2018-08-21

Fatigue Life Evaluation of Coiled Tube under Coupled Load of Internal Pressure, Bending and Torsion

School of Mechanical Engineering, Yangtze University, Jingzhou 434023, China

摘要

摘要: 针对连续管在作业中易出现疲劳失效等问题，进行了连续管在内压、弯扭耦合加载下疲劳寿命评估。首先分析了耦合加载下连续管低周疲劳失效机理，基于Brown-Miller疲劳寿命模型建立了连续管疲劳寿命数值计算模型，开展了内压和弯曲加载下连续管疲劳实验，实验结果证实该数值模型是可行的。计算了内压和弯曲耦合加载下连续管低周疲劳寿命，以及内压和弯扭耦合加载下连续管低周疲劳寿命。计算结果表明，连续管最大塑性应变和疲劳敏感区出现在轴向拉伸面和压缩面，与现场连续管失效情况是一致的。通过计算得到了连续管安全服役的临界扭矩值和内压值。
- 连续管 /
- 扭矩 /
- 塑性变形 /
- 疲劳寿命 /
- 耦合载荷
Abstract: It is necessary to evaluate the fatigue life of coiled tube (CT) under the coupled load of internal pressure, bending load and torsion. First, the failure mechanism of low cycle fatigue of CT under coupling loading is analyzed. Based on Brown-Miller fatigue life model, a numerical calculation model of CT fatigue life is established. The low cycle fatigue life of CT under the coupling load of internal pressure and bending load is calculated. And also the low cycle fatigue life of CT under the load of internal pressure, bending load and torsion is calculated. The calculation results show that the maximum plastic strain and fatigue sensitive areas of CT appear on the axial tensile surface and compression surface, which is consistent with the failure of CT on oil field. The critical torque value and internal pressure of CT are obtained by calculation for CT safety service.
- coiled tube /
- torsion /
- plastic deformation /
- fatigue life /
- coupling load

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图 1 连续管作业示意图

Figure 1. Operation diagram of coiled tube

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图 2 疲劳寿命计算流程

Figure 2. Fatigue life calculation flow chart

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图 3 连续管有限元模型

Figure 3. Finite element model of coiled tube

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图 4 连续管疲劳寿命云图

Figure 4. Fatigue life distribution map on coiled tube

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图 5 连续管低周疲劳塑性应变云图

Figure 5. Low-cycle fatigue plastic strain distribution map on coiled tube

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图 6 弯曲和内压对疲劳寿命的影响

Figure 6. Effects of bending and internal pressure on fatigue life

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图 7 连续管疲劳测试装置示意图

Figure 7. Schematic diagram of coiled tube fatigue test device

1. Straight mode; 2. Flexing mode; 3. Sample; 4. Fixtures; 5. Base; 6. Accumulator; 7. Check valve; 8. Supercharger; 9. Liquid pool; 10. Air valve; 11. Micro air compressor; 12. Valve; 13. Connecting pipe; 14. Cylinder;15. Support; 16. Active connector; 17. Pressure relief valve

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图 8 实验结果与数值计算结果对比

Figure 8. Comparison of experimental results with numerical simulation results

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图 9 弯扭内压耦合载荷下扭矩对疲劳循环次数的影响

Figure 9. Effect of torque on fatigue cycle number under the coupled load of moment, torque and internal pressure

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表 1 连续管材料属性和参数^[16–17]

Table 1. Material properties and coiled tube parameters^[16–17]

Material type	Outer diameter/mm	Wall thickness/mm	Elastic modulus/MPa	Poisson’s ratio
CT-800	60.325	4.775	210 000	0.3

Yield stress/MPa	Cyclic strain hardening coefficient/MPa	Cyclic strain hardening index	Section shrinkage/%
552	785	0.1	58.18

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表 2 有限元模拟值与实验值对比

Table 2. Comparison of finite element simulation results and experimental results

Internal pressure/MPa	Experimental value/N	Finite element value/N	Error/%
65	50	45	10
65	49	45	8
65	52	45	13

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表 3 内压、扭矩对连续管疲劳寿命的影响

Table 3. Influence of internal pressure and torque on fatigue life of coiled tube

Torque/（N·m）	Fatigue life			Torque/（N·m）	Fatigue life
Torque/（N·m）	0 MPa	30 MPa	60 MPa	Torque/（N·m）	0 MPa	30 MPa	60 MPa
1000	>10⁷	>10⁷	>10⁷	7300	8650	352
4000	>10⁷	>10⁷	>10⁷	7400	2090	280
5500	>10⁷	>10⁷	>10⁷	7420	745	234
5800	>10⁷	≥10⁷	≥10⁷	7450	349	196
6000	>10⁷	1331	111	7480	238	145
6200	>10⁷	856	38	7500	179	122
6400	≥10⁷	623	1	7700	18
6800	36 890	408

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