Finite element analysis of thermal loading laser shearography testing forquartz fiber composite materials
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摘要: 在石英纤维增强树脂基复合材料平板上钻直径和深度不同的盲孔，模拟材料内部的孔洞缺陷。以单个盲孔缺陷为研究对象，建立尺寸为100 mm×100 mm×6 mm（长×宽×厚）的分析模型，采用顺序耦合热应力分析方法，对复合材料热加载激光剪切散斑检测进行有限元分析，研究了加载载荷、加热时间、冷却时间以及盲孔缺陷直径和深度对激光剪切散斑检测信号的影响规律。结果表明，增大加载载荷和增加加热时间能够有效提高缺陷的检测效果；延长冷却时间并不能提高缺陷的检测效果，降低了检测效率。盲孔缺陷直径越大，深度越小，越容易被检测出来；不同深度的φ5 mm盲孔缺陷均无法被有效识别。Abstract: Quartz fiber reinforced resin matrix composites drilled with the blind holes of various diameters and various depths were prepared in order to simulate defects of air voids or delaminations under the surface of the material. Taking the single blind hole as the research object, the analysis model of 100 mm×100 mm is established. Finite element analysis of thermal loading laser shearography testing for composite materials was carried out by sequential coupled thermal stress analysis method. The influence of thermal loading, heating time, cooling time and the diameter and depth of blind holes on the signal of laser shearography testing was studied. The results indicate that increasing thermal loading and heating time can effectively improve defects detection effect; extending the cooling time cannot improve the defects detection effect, but reduces the detection efficiency. The bigger diameter and the smaller depth of blind hole, the easier the defect is to be detected, the blind holes of 5 mm diameter with different depths cannot be effectively identified.
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Keywords:
- composite material /
- laser shearography /
- thermal loading /
- finite element analysis
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