SiCウィスカ強化アルミニウム合金の引張・ねじり組合せ応力下の室温・高温破壊特性
SiCウィスカ強化アルミニウム合金の引張・ねじり組合せ応力下の室温・高温破壊特性
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DOI：
10.1299/kikaia.60.1080
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发表时间：
1994-04
期刊：
影响因子：
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通讯作者：
駒井 謙治郎;弘二 箕島;吉田 元太郎
中科院分区：
文献类型：
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作者：
駒井 謙治郎;弘二 箕島;吉田 元太郎
本文描述了在室温和高温下联合拉伸/扭转载荷下通过挤压铸造工艺制造的 SiC 晶须增强 6061 铝合金的拉伸和疲劳断裂行为的研究。测试在负载控制条件下进行，保持组合应力比 α=τ/σ 恒定值。除了断裂伸长率外，复合材料的机械性能（包括疲劳强度）不仅在单轴载荷下而且在拉/扭转联合载荷下均优于未增强的 6061 合金。复合材料和未增强基体材料的静态强度与 Tsai-Hill 失效准则非常吻合。 αl1下的疲劳强度由最大主应力确定，而α>1下的强度由最大等效应力确定。用扫描电子显微镜仔细检查断裂表面，并讨论了拉伸/扭转联合载荷下的断裂机制。
This paper describes an investigation on the tensile and fatigue fracture behavior of an SiC whisker reinforced 6061 aluminum alloy fabricated by a squeeze casting process under combined tension/torsion loading at room and elevated temperatures. The tests were conducted under a load-controlled condition keeping a constant value of the combined stress ratio, α=τ/σ. Except for the elongation at failure, mechanical properties of the composite including fatigue strength were superior to those of an unreinforced 6061 alloy, not only under uniaxial loading, but also under combined tension/torsion loading. The static strength of the composite and the unreinforced matrix material showed good agreement with the Tsai-Hill failure criterion. Fatigue strength under αl1 was determined by maximum principal stress, whereas the strength under α>1 was determined by maximum equivalent stress. Fracture surfaces were closely examined with a scanning electron microscope, and the fracture mechanisms under combined tension/torsion loading were discussed.