0 引言
1 有限元分析
1.1 深脱粘一体药柱装药结构
1.2 有限元模型
dζ
lg αT=-
0.12439 +0.07746 +0.03229 +
0.04262 +0.01)
表1 材料性能参数Table 1 The parameters of materials |
| Part | ρ/(kg/m3) | E/MPa | μ | α/K-1 | λ/(W/(m·K)) | C/(J/(kg·K)) |
|---|---|---|---|---|---|---|
| Propellant | 1 800 | In table 2 | 0.494 | 8.99×10-5 | 0.40 | 1 433 |
| Insulated structure | 1 200 | 10.8 | 0.496 | 3.16×10-5 | 0.23 | 2 261 |
| Coated structure | 1 400 | 37.0 | 0.496 | 2.91×10-4 | 0.26 | 1 520 |
| Case | 1 650 | 2.4×105 | 0.330 | 5.6×10-5 | 1.35 | 780 |
表2 推进剂快速拉伸力学性能参数Table 2 The parameters of propellant |
| Temperature/℃ | Extension rate/ (mm/min) | E/MPa | εb/% |
|---|---|---|---|
| +20 | 2 | 3.83 | 49.1 |
| +20 | 2 000 | 6.70 | 52.2 |
| -30 | 2 | 9.89 | 52.4 |
| -30 | 2 000 | 29.02 | 41.7 |
1.3 载荷分析
表3 无损检测药柱上侧间隙值Table 3 Non-destructive testing value of upper gap |
| Temperature/℃ | Head of gap/mm | Middle of gap/mm | Tail of gap/mm |
|---|---|---|---|
| +20 | 0.4 | 0.9 | 2.6 |
| -30 | 0.5 | 1.4 | 4.1 |
2 计算结果及分析
2.1 固化降温载荷应力应变分析
2.2 点火内压载荷应力应变分析
3 试验验证分析
3.1 模拟发动机试验
3.2 发动机低温点火试验
fT=
fP=
f=
表5 安全系数计算汇总表Table 5 Prameters of the calculation of safety factor |
| Parameter | Value |
|---|---|
| Temperature/℃ | -30 |
| Max stain under temperature decreased/% | 4.91 |
| Max stain under ignition pressurization/% | 19.7 |
| Breaking extensibility of propellant (2 mm/min,-30 ℃)/% | 52.4 |
| Breaking extensibility of propellant (2 000 mm/min,-30 ℃)/% | 41.7 |
| Safety factor under temperature decreased | 10.67 |
| Safety factor under ignition pressurization | 2.11 |
| Comprehensive safety factor | 1.76 |