Multi-Axial Fatigue Properties under Tension-Torsion Loading for Short-Glass-Fiber-Reinforced Phenolic-Resin Matrix Composite
Multi-Axial Fatigue Properties under Tension-Torsion Loading for Short-Glass-Fiber-Reinforced Phenolic-Resin Matrix Composite
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短玻纤增强酚醛树脂基复合材料拉扭转载荷下的多轴疲劳性能
DOI：
10.2472/jsms.60.1116
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
H. Aoyama
中科院分区：
文献类型：
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作者：
Takahiko Sawada;H. Aoyama
对注射成型（S系列）和传递成型（P系列）工艺制备的短玻璃纤维增强酚醛树脂基复合材料（GF/Phenol）进行了室温下不同拉扭载荷比下的静态和疲劳试验。我们研究了短纤维含量（V_∞ = 0%、20%和50%）和应力比α = τ/σ对静态和疲劳性能的影响。单轴加载条件下的静态强度和弹性模量随短纤维含量的增加而增加。此外，注射成型工艺对短纤维含量的敏感性高于传递成型工艺。静强度与Tsai-Hill准则吻合较好。在整个疲劳寿命范围内，最大主应力σp1，max与失效循环次数Nf近似呈线性关系。用静强度的主应力σ p1，0归一化σp1，max，得到了与V_∞，α和成型工艺有关的S-N曲线。为了统一评估GF/Phenol的多轴疲劳寿命，应用了Tsai-Hill准则的无量纲有效应力σ*。在双对数图上，σ ~* 与N的关系符合Basquin指数律，与成型工艺、V~*和α无关。Basquin定律中的材料常数n表明，S系列（n = 26.3）和P系列（n = 27.0）的σ ~*-N曲线斜率相当。结果表明，用具有独特S-N曲线的σ* 可以预测GF/Phenol复合材料的多轴疲劳寿命。
Static and fatigue tests under varying load ratio of tension and torsion at room temperature were carried out with short-glass-fiber-reinforced phenolic-resin matrix composites (GF/Phenol) made by injection-molded (S-series) and transfer-molded (P-series) processes. We investigated the short fiber content (V = 0%, 20%, and 50%) and stress ratio α = τ/σ effect on static and fatigue properties. Static strength and elastic modulus in uniaxial loading conditions were higher with increasing short fiber content. Furthermore, sensitivity for short fiber content of the injection-molded process was higher than that of the transfer-molded one. Static strength showed good agreement with the Tsai-Hill criterion. Relationships between the maximum principal stress σp1, max and number of cycles to failure Nf were approximately linear in the whole range of fatigue life. Normalizing σp1, max with the principal stress of static strength σp1, 0 gave S-N curves that depended on V, α and the molding processes. For unified evaluation of multi-axial fatigue life for GF/Phenol, non-dimensional effective stress σ* by the Tsai-Hill criterion was applied. Relationships between the σ* and N onto a double logarithmic chart was presented in the form of Basquin's exponential law without dependence on molding-process, V and α. The material constant n in Basquin's law showed a slope of σ*-N curves of S-series (n = 26.3) was equivalent to P-series (n = 27.0). It has been confirmed the multi-axial fatigue life of GF/Phenol could be predicted by using σ* with unique S-N curve.