应变不变量失效理论是一种新型的基于物理失效模式的复合材料强度理论,广泛应用于复合材料结构失效分析。根据该理论,建立了碳纤维增强树脂基复合材料微观力学模型,获取树脂基体和纤维不同位置的机械应变放大系数和热应变放大系数。对国产复合材料CCF300/5228、CCF300/5428和T700/5428不同铺层角单向层合板进行拉伸试验,并根据试验结果得到对应复合材料的应变不变量性能。分析了增强体纤维和树脂基体对复合材料应变不变量性能的影响;并将应变不变量失效理论应用于国产复合材料失效分析。结果表明碳纤维增强树脂基复合材料应变不变量性能中的第一应变不变量和基体Von-Mises应变临界值取决于树脂,而纤维Von-Mises应变临界值取决于增强体纤维;应变不变量失效理论能够用于国产复合材料失效分析。
Strain invariant failure theory（SIFT） is a novel micromechanics-based failure criteria for composites,which could be applied to all composite failure analysis.The micromechanics model was built to obtain the mechanical and residual thermal strain aplification factors of fiber and resin.Tensile properties of the domestic composites CCF300/5228、 CCF300/5428 and T700/5428 in various unidirectional laminate configurations were measured.Test results were used to obtain SIFT invariant properties.The effect of the component of composites on the SIFT invariant properties was investigated.The results show that the critical first strain invariant and von-mises strain of matrix are dependent on resins,while critical von-mises strain of fiber depends on fibers.SIFT can be used for the failure analysis of domestic composites.
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