Influence of stacking direction on the local cyclic plastic behavior of selective laser melted TC4 alloy notched parts
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摘要: 通过数字图像相关技术从宏观塑性变形方面研究了堆积方向对激光选区熔化（SLM）TC4合金缺口件局部循环塑性行为的影响。结果表明：缺口附近的塑性变形受堆积方向和缺口半径的影响，进而影响缺口件的疲劳寿命。缺口根部的棘轮应变及其应变率随堆积方向改变(0°至90°)而降低，同时也随缺口半径的增加而降低。与缺口半径相比，棘轮应变及应变率和疲劳寿命对堆积方向敏感性更低。研究结果为SLM构件的疲劳设计提供了一定的理论参考。Abstract: In this paper the influence of stacking direction on the local cyclic plastic behavior of selective laser melted (SLM) TC4 alloy notched parts had been investigated through digital image correlation technology. The results indicate that the plastic deformation near the root of the notched parts can be influenced by the stacking direction and notch radius, thereby affecting the fatigue life of the notched parts. The ratcheting strain and strain rate near the root of the notch decrease with the change of stacking direction (from 0° to 90°), and also decrease with the change of the notch radius. Compared with effect by notch radius, stacking direction cause less influence on the ratchet strain, strain rate and fatigue life. The research results will provide a certain theoretical reference for the fatigue design of SLM parts.
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Key words:
- TC4 /
- selective laser melted /
- stacking direction /
- notch /
- cyclic plasticity /
- ratcheting strain /
- fatigue life /
- DIC
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图 2 U型缺口试样示意(r=0.2、1.2 mm)
Figure 2. Schematic diagram of U-shaped notch specimen (r=0.2, 1.2 mm)
图 3 疲劳试验装置及试件应变云图
(a)疲劳试验设备； (b)DIC测试散斑试样； (c)应变云图
Figure 3. Experimental setup and strain cloud diagram of specimens
图 4 缺口半径r=0.2 mm，D1、D2、D3堆积方向的棘轮应变(εr)及应变幅值(εa)随循环周次(N)变化曲线
Figure 4. The curves of ratcheting strain(εr) and strain amplitude(εa) in D1, D2, and D3 stacking directions variation with cycle number (N) under notch radius r=0.2 mm
(a)D1； (b)D2； (c)D3
图 5 缺口半径r=1.2 mm，D1、D2、D3堆积方向的棘轮应变(εr)及应变幅值(εa)随循环周次(N)变化曲线
Figure 5. The curves of ratcheting strain(εr) and strain amplitude(εa) in D1, D2 and D3 stacking directions variation with cycle number (N) under notch radius r=1.2 mm
(a)D1； (b)D2 ；(c)D3
图 6 N=200次时，两种缺口半径不同堆积方向的棘轮应变(εr)和应变幅值(εa)
Figure 6. Ratcheting strain(εr) and strain amplitude(εa) of two different notch radii with different stacking directions at N=200 cycles
(a)r=0.2 mm ；(b)r=1.2 mm
图 7 N=200次时，三种堆积方向不同缺口半径的棘轮应变(εr)和应变幅值(εa)
Figure 7. Ratcheting strain(εr) and strain amplitude(εa) of different notch radii in three stacking directions with N=200 cycles
(a)D1； (b)D2； (c)D3
图 8 N=200次时，两种缺口半径D1、D2、D3堆积方向的应变云图
Figure 8. Strain cloud maps of stacking direction for D1, D2, and D3 with N=200 cycles
(a)D1 ；(b)D2； (c)D3
图 9 距离缺口根部d=0.6 mm处(A点)不同堆积方向棘轮应变(εy)随循环周次(N)的变化
Figure 9. Ratcheting strain(εy) in different stacking directions at a distance of d=0.6 mm from the root of the notch (point A) Changes with cycle number (N)
(a)r=0.2 mm ；(b)r=1.2 mm
图 10 距离缺口根部d=0.6 mm处(A点)不同缺口半径棘轮应变(εy)随循环周次(N)的变化
Figure 10. Ratcheting strain(εy) at different notch radii at d=0.6 mm from the root of the notch (point A) changes with cycle number (N)
(a)D1；(b)D2； (c)D3
表 1 3D打印钛合金化学成分
Table 1. Chemical composition of 3D printed titanium alloy
% Ti Al V Fe Si C N O H 余量 5.86 4.18 0.04 0.03 0.013 0.0054 0.099 0.0011 
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表 2 两种缺口半径不同堆积方向试样的疲劳寿命
Table 2. Fatigue life of two different notch radii with different stacking directions
缺口半径r/mm 堆积方向/(°) 寿命N/周次 0.2 D1 0° 538 D2 45° 290 D3 90° 215 1.2 D1 0° 1790 D2 45° 1650 D3 90° 1040
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