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鉴于传统的断裂力学无法用于受损复合材料层板,本文探索了损伤力学在复合材料层板中的应用。文内介绍了复合材料层板损伤试验的概况及损伤测试方法,文中三种层板单向拉伸损伤试验结果的分析表明在单向拉伸载荷下基于J.Lemaitre应变等效性假设的损伤能释放率Y_2可用于描述受损复合材料层板的力学状态,它的演变方程通常可用Y_2=α(σ/σ_c)β的简单函数形式来描述。对特定的层板,α、β是与初始缺陷无关的常数,可由层板损伤试验确定。试验数据表明在单向拉伸载荷下,临界损伤能释放率对特定的层板也是与初始缺陷无关的常数,反应了材料抗损伤扩展的能力。所有这些结论都为进一步建立完整损伤破坏判据奠定了基础。
In view of the traditional fracture mechanics can not be used for damaged composite laminates, this paper explores the application of damage mechanics in composite laminates. The paper introduces the general situation of damage test of composite laminates and the method of damage test. The results of the uniaxial tensile damage test of the three laminates show that under the uniaxial tensile load, the damage based on the Equivalence assumption of strain at J. Lemaitre The release rate Y_2 can be used to describe the mechanical behavior of the damaged composite laminates. Its evolution equation can usually be described by a simple function of Y_2 = α (σ / σ_c) β. For a particular laminate, α, β are constants that are independent of the initial defect and can be determined by a laminate damage test. Experimental data show that under a uniaxial tensile load, the critical damage release rate is also a constant unrelated to the initial defect for a given laminate, reflecting the ability of the material to resist damage propagation. All these conclusions lay the foundation for further establishing the criterion of complete damage damage.