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of Mechanical Strength, 2007, 29(2): 251-255. (in Chinese) [19] FISHER J W. Fatigue and fracture in steel bridges [M]. New York: John Willey and Sons, 1984. [20] CONNOR R J, HODGSON I C, MAHMOUD H N, Bowman C...), 2005. [21] CRUDELE B B, YEN B T. Analytical examination of S-N curves below constant amplitude fatigue limit [C]// Proc 1st Int Conf on Fatigue and Fracture in the Infrastructure. Bethlehem, PA......
to the impact fatigue load besides high temperature, wear and tear[2]. In other words, the ZL108 alloy as the piston alloy should be superior in its fracture toughness. It is well known that a little... length 12.0 mm. 2.4 Test method The plane-strain fracture toughness KIC of SE(B) specimens were tested on MTS 810 material testing system. All specimens should be precracked in fatigue method before......
Effects of pitting corrosion on fatigue life of aluminum alloy Y12CZ based on initial discontinuity state YU Da-zhao(郁大照) 1, CHEN Yue-liang(陈跃良)2, HU Jia-lin(胡家林)1, YANG Mao-sheng(杨茂胜)1 1. Naval...: Based on initial discontinuity state (IDS) of material, a preliminary analytical model was presented to evaluate the effect of interaction of pitting corrosion and fatigue loading on the residual......
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treatment (493 ℃/20 min and 503 ℃/20 min) on fatigue fracture and room mechanical properties of 2E12 aluminum alloy were investigated. Observation of microstructure and fatigue fracture was presented... for macro-crack propagation to reduce the fatigue properties. Key word: 2E12 aluminum alloy; solution treatment; microstructure; fatigue fracture Al-Cu-Mg系铝合金以其较高的强度及较好的抗疲劳损伤性能,长期以来被广泛应用于航天,航空工业及民用工业等领域,尤其是......
were measured by fatigue tests, decrease gradually prior to final fracture. Corrosion fracture first occurs in the range of notch with a higher tensile bending stress, and exhibits clear evidence... reliability in various micro-system devices, it is necessary to understand the mechanical properties of thin films, including their fracture, fatigue, elastic and plastic properties. Fatigue......
microstructure(BM)(b) of alloy 图2 疲劳试验示意图 Fig. 2 Illustration of fatigue specimens (Unit: mm) 2 结果与讨论 2.1 裂纹萌生区断口形貌分析 图3 片层和双态的疲劳断口宏观形貌 Fig. 3 Macroscopic fracture.... 5 SEM images of primary crack initiation region on HCF fracture surface of BM 表1 不同应力幅下两种组织的疲劳裂纹萌生源位置和疲劳寿命 Table 1 Initiation site of fatigue primary crack and fatigue life for LM......
defects is near to the upper limit of the fatigue life data. The fatigue fracture surface of the samples with minor defects possesses the mixed characteristics of quasi-cleavage, lacerated ridge and dimple and it is brittle fracture mode as a whole. Key words: magnesium alloy; die casting; high cycle fatigue; rare earths; fractography ......
. By analyzing the fatigue fracture of the samples, larger area of fatigue striations and cleavage fracture in samples are also observed, as well as the shallower dimples. The twin laminae are likely... on the fatigue deformation of magnesium alloys nowadays is just the behavior of macroscopic cyclic deformation and fatigue fracture [14], ignoring that the induced fatigue deformation in essence......
and observed on a TECNAI G2 F20 electron microscope, with an acceleration voltage of 200 kV. The fatigue fracture surfaces and crack propagation paths were analyzed on FEI QUANTA- 200 and Helios scanning... and 4.1257 μm, respectively. WANG et al [26] and WEI et al [28] studied the mechanical properties and fatigue fracture behavior of Al–5.67Zn–1.92Mg–1.89Cu alloy with different heat treatments, and its......
