FATIGUE PROPERTIESOF WOOD PLASTIC COMPOSITES
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摘要: 研究了杨木和桦木两种不同结构的木材与木塑复合材料(WPC)的疲劳性能和疲劳裂纹的扩展机理。研究结果表明,WPC的最大应力与循环寿命的对数呈线性关系;木材的疲劳载荷随树脂含量的增加呈线性增大,杨木的S-N曲线斜率受树脂含量的影响,疲劳裂纹沿木纤维方向扩展。桦木塑料复合材料(PC>30wt.%)疲劳裂纹以"Z"字型方式扩展。Abstract: The fatigue properties of two types of wood (P. Ussurensis and B. Platyphylla) and wood plastic composites were analyzed by three-point bend fracture testing, and fatigue crack propagation models were investigated. Test results show that the maximum stress of wood plastic composites presents a linear relationship with logarithmic fatigue life. Fatigue load increases linearly with enhanced polymer content. For P. Ussurensis, the slope of S-N fatigue curve is influenced by polymer content in wood, and fatigue crack grows along wood fibre. For B. Platyphylla plastic composites (PC>30 wt.%), fatigue crack grows in the shape of 'Z’ along the height of the specimen.
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Key words:
- wood plastic composites /
- fatigue properties /
- crack propagation
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