蠕变-疲劳耦合作用下推力室内壁结构损伤分析

王红建; 王超; 施蔚; 杜大华

doi:10.13224/j.cnki.jasp.20220481

蠕变-疲劳耦合作用下推力室内壁结构损伤分析

doi: 10.13224/j.cnki.jasp.20220481

王红建¹,
王超^1,*, ,,
施蔚¹,
杜大华²

1.
西北工业大学航空学院，西安 710072
2.
中国航天科技集团有限公司西安航天动力研究所，西安 710100

详细信息

作者简介:
王红建（1968-），男，副教授、硕士生导师，博士，主要从事结构失效与抗疲劳设计技术研究

通讯作者:
王超（1998-），男，硕士生，主要从事结构失效与抗疲劳设计技术研究。E-mail：wangc_@mail.nwpu.edu.cn

中图分类号: V434⁺.24
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出版历程
- 收稿日期: 2022-07-04
- 网络出版日期: 2023-09-27

Damage analysis of thrust chamber wall structure under the creep-fatigue interaction

WANG Hongjian¹,
WANG Chao^{1,*
, ,},
SHI Wei¹,
DU Dahua²

1.
School of Aeronautics，Northwestern Polytechnical University，Xi’an 710072，China
2.
Xi’an Aerospace Propulsion Institute，China Aerospace Science and Technology Corporation，Xi’an 710100，China

摘要

摘要:
可重复使用液体火箭发动机能大幅降低航天运输成本，其中推力室内壁结构的循环使用寿命是影响可重复使用性能的关键因素。基于Chaboche随动强化模型和Norton蠕变模型建立推力室内壁材料的本构方程；采用瞬态热-力耦合分析方法，获得推力室各工况下的温度场与应力-应变分布；通过Lagneborg累积损伤法建立损伤模型，其中考虑了蠕变-疲劳的耦合作用，以预测内壁结构损伤及循环寿命。研究结果表明：推力室内壁结构损伤形式以低周疲劳损伤和蠕变-疲劳耦合损伤为主，其中低周疲劳损伤占比65.8%，蠕变-疲劳交互作用损伤占比29.8%，因此为了准确预测推力室内壁结构的循环使用寿命，需考虑结构在蠕变-疲劳耦合损伤作用下的影响因素。
- 推力室 /
- 低周疲劳 /
- 高温蠕变 /
- 交互损伤 /
- 寿命预测
Abstract:
The reusable liquid rocket engine can greatly reduce the cost of space transportation. One of the key factors for the reusable performances is cyclic life of inner wall structures of thrust chamber. The constitutive equations of wall materials of the thrust chamber were established based on Chaboche kinematic hardening model and Norton creep model. The temperature fields and stress-strain distributions of the thrust chamber under various working conditions were obtained by employing the analysis of transient thermo-mechanical coupling; the damages and cyclic life of the inner wall structure were investigated by Lagneborg cumulative damage model by considering the coupling effects of creep and fatigue. The investigation showed that the key patterns of damage in wall structures of thrust chamber were low-cyclic fatigue and creep-fatigue interaction damage with low-cycle fatigue damage ratio 65.8%, and creep-fatigue interaction damage ratio 29.8%. Therefore, in order to accurately predict the cycle life of thrust inner wall structures, the influencing factors of structures under the action of creep-fatigue interaction damage should be considered.
- thrust chamber /
- low-cyclic fatigue /
- high temperature creep /
- interactive damage /
- life prediction

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图 1 单通道喉部扇区几何模型

Figure 1. Single channel throat sector geometry

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图 2 喉部扇区有限元模型

Figure 2. Throat sector finite element model

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图 3 一个循环下冷却剂壁面压力载荷变化

Figure 3. Variation of coolant wall pressure load under one cycle

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图 4 瞬态热分析结果

Figure 4. Transient thermal analysis results

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图 5 各阶段环向应变分布图

Figure 5. Circumferential strain distribution at each stage

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图 6 选取截面示意图

Figure 6. Select cross-section schematic

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图 7 截面1 不同阶段环向应变分布

Figure 7. Section 1 circumferential strain distribution at different stages

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图 8 截面1上P₄点单循环各应变分量变化

Figure 8. Variation of each strain component in a single cycle at point P₄ on section 1

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表 1 不同温度下Chaboche模型参数

Table 1. Chaboche model parameters at different temperatures

温度/K	${C_{ {{\rm{C}},1 } } } $/MPa	${C_{ {{\rm{C}},2 } } } $/MPa	${C_{ {{\rm{C}},3 } } } $/MPa	$ {\gamma _1} $	$ {\gamma _2} $	$ {\gamma _3} $
27.15	5762.8	13657	18812	137	596	2085.8
295.15	21326	4041	15118	1884	118	393.2
533.15	19970	86348	18219	354	12290	1617.3
811.15	20940	2629.7	20941	1091	123	1090.9

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表 2 Norton蠕变模型参数

Table 2. Norton creep model parameters

温度/K	${C_{ {{\rm{N}},1 } } }$	${C_{ {{\rm{N}},2 } } }$	${C_{ {{\rm{N}},3 } } }$
293～773	0.97426	1.7639	11529
773～923	2.745×10¹⁵	0.8713	11579
923～1073	1.098×10¹⁷	0.9043	11593

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表 3 交互作用系数计算表

Table 3. Interaction coefficient calculation table

总应变范围/%	蠕变-疲劳失效循环数	蠕变-疲劳失效保载时间/s	疲劳损伤	蠕变损伤	交互作用系数$H$	蠕变-疲劳交互损伤
2.6	102	30600	0.4032	0.1547	1.7712	0.4424
2.6	75	22500	0.2964	0.1137	3.2134	0.5899
0.9	262	78600	0.2241	0.3342	1.6142	0.4418
0.9	317	95100	0.2712	0.4044	0.9801	0.3246

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表 4 各考察点损伤计算

Table 4. Damage calculation for each inspection point

考察点	等效应变范围/%	单次循环疲劳损伤/10⁻⁴	单次循环蠕变损伤/10⁻⁴	交互乘积项	单次循环交互损伤/10⁻⁴
1-P₃	0.742	3.5323	1.3211	1.2206	2.7115
1-P₄	1.673	25.510	1.7066	1.7453	11.516
2-P₃	0.746	3.6219	1.3668	1.2225	2.7200
2-P₄	1.617	24.213	1.7469	1.7077	11.106
3-P₃	0.697	3.0084	1.1868	1.1998	2.2671
3-P₄	1.330	14.925	1.7241	1.5300	7.7612

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表 5 各考察点寿命预测值

Table 5. Life expectancy at each inspection point

考察点	等效应变范围/%	单次循环总损伤/10⁻³	N	疲劳损伤占比/%	蠕变损伤占比/%	交互损伤占比/%
1-P₃	0.742	3.0260	330	46.7	17.4	35.9
1-P₄	1.673	15.493	64	65.8	4.4	29.8
2-P₃	0.746	3.0835	324	47.0	17.7	35.3
2-P₄	1.617	14.826	67	65.3	4.7	30.0
3-P₃	0.697	2.5849	386	46.5	18.4	35.1
3-P₄	1.330	9.7640	102	61.1	7.1	31.8

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