Experimental study on fracture behavior of preloaded CFRC laminate under laser irradiation
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摘要: 针对激光与机械载荷联合作用下碳纤维/环氧树脂增强复合材料（CFRC）层合板失效时间的预测需求，实验研究了不同激光功率密度（70～210 W/cm2）、不同预应力水平（拉伸强度的50%和70%）、不同光斑尺寸（拉伸试件宽度的70%和100%）下2 mm厚层合板的失效机理，获取了不同影响因素对断裂时间的影响规律。结果表明：预加载层合板失效机制为迎光面环氧树脂基底材料热解、纤维氧化断裂，背光面剩余结构偏脆性断裂；在预应力一定条件下，试件断裂时间与辐照激光功率密度成指数规律；预应力水平对断裂时间影响显著。Abstract: To predict the failure time of carbon fiber/ epoxy resin reinforced composite laminates under the combined action of laser and mechanical load, different laser power density (70–210 W/cm2), different pre-stress levels (50% and 70% of tensile strength) were studied experimentally. The failure mechanism of 2 mm laminates under different spot sizes (70% and 100% of the width of tensile specimens) was obtained, and the influence rule of different influencing factors on fracture time was obtained. The results show that the failure mechanism of pre-loaded laminates is the pyrolysis of the substrate material of epoxy resin, the oxidation fracture of the fiber and the brittle fracture of the residual structure of the back surface. Under certain pre-stress conditions, the fracture time and the irradiated laser power density are exponential. The pre-stress level has a significant effect on the fracture time.
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Key words:
- laser /
- preloaded /
- CFRC laminate /
- fracture
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图 1 激光辐照预加载复合材料实验系统示意图
Figure 1. Experimental system of laser irradiation pre-loaded composite materials
图 2 激光光斑分布与辐照区域示意图
Figure 2. A schematic diagram of laser spot distribution and irradiated area
图 3 单纯力学拉伸试件典型损伤形貌
Figure 3. Damage outlines of CFRC laminate after mechanical tensile test
图 6 预应力对断裂时间的影响规律
Figure 6. Relationship between time to fracture and pre-stain under different laser intensity
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