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- 2016
二维C/SiC复合材料准静态和动态拉伸力学性能
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Abstract:
采用分离式Hopkinson拉杆装置和电子万能试验机研究了二维C/SiC复合材料在4种应变率（0.001、0.010、90.000和350.000 s-1）下的拉伸力学性能，计算并验证了动态试验中的应力平衡状态；采用SEM分析了复合材料在不同应变率下的破坏断口和失效机制；建立了复合材料包含损伤和应变率相关的本构方程。结果表明：二维C/SiC复合材料的应力-应变曲线都表现出非线性的特征。随着应变率的增加，二维C/SiC复合材料的拉伸强度从204 MPa增加到270 MPa，增加了33%，这表明复合材料的拉伸强度具有较强的应变率敏感性。复合材料在准静态和动态加载下表现出不同的破坏模式是由材料内部界面行为的应变率效应造成的。 The tensile mechanical properties of two dimensional C/SiC composites at 4 strain rates (0.001, 0.010, 90.000 and 350.000 s-1) were investigated by split Hopkinson tensile bar device and an electronic universal test machine. The stress equilibrium status in the dynamic experiment was calculated and verified. SEM was employed to analyze the damage fracture and failure mechanism of the composites at different strain rates. The damage and strain rate related constitutive equation of the composites was established. The results show that the stress-strain curves of the two dimensional C/SiC composites show non-linearity characteristics. The tensile strength increases from 204 MPa to 270 MPa, up by 33% with the increase of strain rate for two dimensional C/SiC composites, testifying the strong strain rate sensitivity of the tensile strength for the composites. The composites show different failure modes under quasi-static and dynamic loading, which are caused by the strain rate effect on the interface behavior in the material. 国家自然科学基金（11402302）；中国博士后科学基金（2016M592923）；陕西省自然科学基金（2016JQ1031）
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