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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Assessment of back stress and load transfer approaches for rationalizing creep of short fiber reinforced aluminum alloys
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Assessment of back stress and load transfer approaches for rationalizing creep of short fiber reinforced aluminum alloys

机译：评估背应力和载荷传递方法，以合理化短纤维增强铝合金的蠕变

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Creep data from a model Al-Zn alloy reinforced with Saffil short fibers were evaluated following the threshold stress and the load transfer approaches usually employed in the creep data analysis of metal matrix composites. Experiments indicate that the short fiber reinforced material creeps with a stress exponent of 10 while the matrix stress exponent is 5. Procedures published in the literature which yield natural stress exponents and threshold stresses which decrease with increasing temperature were reproduced; however, threshold values corresponding to natural stress exponents cannot be physically justified. The procedures considered in this paper yielded no precise results. Several combinations of stress exponents/threshold values and activation energies are shown to satisfy the procedural requirements. Therefore load transfer and threshold approaches should always be combined with microstructural investigations before an attempt is made to rationalize creep behavior of MMCs.
机译：根据阈值应力和通常用于金属基复合材料蠕变数据分析的载荷传递方法，评估了用Saffil短纤维增强的模型Al-Zn合金的蠕变数据。实验表明，短纤维增强材料的蠕变应力指数为10，而基体应力指数为5。文献中公开了产生自然应力指数和随温度升高而降低的阈值应力的程序；但是，与自然应力指数相对应的阈值在物理上无法证明是正确的。本文所考虑的程序未产生精确的结果。显示了应力指数/阈值和激活能的几种组合，以满足程序要求。因此，在尝试合理化MMC的蠕变行为之前，应始终将载荷传递和阈值方法与微结构研究结合起来。

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