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本文根据高强度铝合金在力学试验过程中的行为与断口表面形貌讨论了它们的疲劳裂纹扩展特性。在相当宽的疲劳扩展速率的范围内,裂纹的延伸途径有两种:以塑性条纹的形成与显微孔洞的聚集。在应力强度比平面应变断裂韧性低得多的情况下可以看到韧窝,这是因为裂纹尖端附近可能有夹杂物,而塑性条纹的形成过程,可以认为裂纹尖端处的介质促进的脆性断裂和塑性下降同时作用的结果。
In this paper, the fatigue crack propagation characteristics of high strength aluminum alloy are discussed based on the behavior of the high strength aluminum alloy during mechanical testing and the fracture surface morphology. Within a fairly wide range of fatigue propagation rates, there are two ways in which cracks can extend: plastic streak formation and microporosity accumulation. The dimples can be seen where the stress intensity is much lower than the plane strain fracture toughness because inclusions may be present near the crack tip and the formation of plastic streaks may be considered as medium-induced brittle fracture at the crack tip and Plasticity at the same time the result of the decline.