Damage and fracture behavior of a metal sheet under in-plane compression–shear deformation
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摘要: 相變誘導塑性鋼（TRansformation induced plasticity, TRIP）作為常用的先進高強鋼在汽車等交通工具的輕量化方面有廣泛的應用前景。而對于其復雜零件的成形過程，韌性斷裂是不可忽視的問題之一。本文針對現有實驗裝置不易誘發薄板承受面內壓剪時斷裂失效，從而無法研究板料負應力三軸度區間斷裂行為的問題，以高強鋼TRIP800薄板為研究對象，設計了可在單向試驗機完成壓剪實驗的試樣和夾具。通過調整夾具旋轉角度和試樣裝夾位置可以實現同一種試樣在廣泛的負應力三軸度范圍內進行壓剪斷裂分析。基于ABAQUS/Explicit平臺建立了三個典型加載方向20°、30°和45°對應的壓剪過程有限元模型，分析表明：三種情況的試樣局部變形區域的應力三軸度都小于0且斷裂點的應力三軸度低至?0.485，驗證了設計的裝置可實現負應力三軸度區間的斷裂失效分析，同時基于MMC斷裂準則分析了不同應力狀態的初始損傷情況及損傷擴展路徑。Abstract: Increasing demands for lightweight manufacturing accelerate the application of lightweight materials in the transportation, aviation, and power industries. High-strength steel is a popular candidate among various lightweight materials. Transformation-induced plasticity (TRIP) steel, a high-strength, lightweight steel, is promising for forming processes owing to its high strength and toughness. However, the increase in the flow strength of metals will create big challenges for material formability and fracture issues for manufacturing processes. Ductile fracture is still the main failure form during the forming process of TRIP steel. Sheet metal is subject to complex stress states when it undergoes diverse loading paths. Failure modes in metal forming can be mainly classified into the following: tensile, compression, shear, tensile–shear, and compression–shear. Because the metal sheet is prone to buckling failure when it undergoes in-plane compression–shear deformation, it is difficult to induce fracture during the corresponding negative stress triaxiality range. To solve this issue, a novel experimental setup and a specimen were designed to analyze fracture behaviors of an advanced high-strength steel TRIP800 sheet. For the same specimen, the failure behaviors of diverse stress states could be achieved by adjusting the angles between the loading direction and specimen positions. The parallel numerical simulations of in-plane compression–shear deformations under three typical loading angles of 20°, 30°, and 45° were performed on the ABAQUS/Explicit platform. The predicted stress triaxiality in the local deformation region of the three cases was less than zero, and the lowest was up to ?0.485, which verifies that the fracture failure analysis of negative stress triaxiality range could be realized with the designed device. In addition, the fracture onset information and damage evolution were analyzed based on the modified Mohr–Coulomb (MMC) fracture criterion. Furthermore, the fracture strain at the fracture point decreased with the decrease in stress triaxiality when the stress triaxiality was less than ?1/3.
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Key words:
- TRIP800 /
- in-plane compression–shear /
- stress triaxiality /
- stress state /
- damage evolution
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圖 2 試樣結構和尺寸圖。（a）結構圖；（b）尺寸圖（單位: mm）
Figure 2. Geometrical characteristics and dimensions of the specimen: (a) structure diagram；(b) dimensions diagram (unit: mm)
圖 3 實驗夾具組件與裝配
Figure 3. Experimental setup of the in-plane compression–shear experiment
圖 8 α=45°時試樣局部變形區損傷演化圖。（a）d=3.9 mm；（b）d=4.1 mm；（c）d=4.3 mm；（d）d=4.7 mm
Figure 8. Damage evolution of the local deformation zone of the specimen for α = 45°: (a) d=3.9 mm; (b) d=4.1 mm; (c) d=4.3 mm; (d) d=4.7 mm
圖 9 三種加載角度試樣局部變形區在初始斷裂時刻的應力三軸度
Figure 9. Stress triaxiality in local deformation zones for specimens under different loading angles at fracture onset
圖 10 三種加載角度試樣變形區不同位置η的演化圖
Figure 10. Evolution of η at different positions during the experiment under different loading angles
圖 11 不同加載角度時試樣損傷因子D隨加載位移d的演化圖
Figure 11. Evolution of a damage factor D with loading displacement d for different loading angles
表 1 H13鋼和40Cr的材料屬性
Table 1. Material properties of H13 and 40Cr
Material Density/
(kg?m?3)Young’s
modulus/
MPaPoisson’s
ratioYield strength/
MPaTensile strength/
MPaH13 7850 210000 0.3 1550 1800 40Cr 7900 210000 0.28 785 810 
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表 2 三個方向的厚向異性系數及Hill’48函數的六個各向異性參數
Table 2. Three Lankford ratios and six anisotropic parameters of the Hill’48 function
r0 r45 r90 G K M N P Q 0.87 0.81 1.03 0.452 0.535 0.465 1.5 1.5 1.289
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表 3 不同加載角度試樣的初始斷裂應變和應力三軸度關系
Table 3. Initial fracture strain and stress triaxiality at the fracture onset of specimens under different loading angles
Loading angle, α/(°) Displacement Fracture strain Stress triaxiality, η 20 2.1 0.60 ?0.485 30 2.7 0.75 ?0.424 45 4.1 1.06 ?0.419
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