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RELATIONSHIP BETWEEN J-INTEGRAL AND FRACTURE SURFACE AVERAGE PROFILE K.Tanaka1,S.F. Xue2,Y.G. Cao2 (1.Department of Mechanical Systems Engineering, Toyama Prefectural University, Toyama 939-0398.... The principle of the fracture-surface topography analysis (FRASTA) was used. In FRASTA, the fracture surfaces were scanned by laser microscope and the elevation data was recorded for analysis......
Fracture criterion for predicting surface cracking of Ti40 alloy in hot forming processes ZHANG Xue-min(张学敏)1, ZENG Wei-dong(曾卫东)1, SHU Ying(舒 滢)1, 2, ZHOU Yi-gang(周义刚)1, ZHAO... rate range of 0.01-10 s-1 to investigate its fracture behavior and critical fracture conditions in hot forming. It was observed that the failure of Ti40 alloy is attributed to longitudinal surface......
that the flexural strength of the treated samples is improved to 10.9%. Fractographic analysis show that the fracture origins move from the surface to subsurface. It is concluded that laser surface processing have significant effects on fracture behavior of flexure Si3N4 ceramic. Key words: Si3N4; silicon nitride ceramic; laser surface processing; surface integrity; flexural strength; fracture origin 1......
measured by compression tests. The structure and thermal characteristics were analyzed by XRD and DSC, and the fracture surface morphology was examined by SEM. The glassy alloy with 4 mm in diameter...Synthesis and compressive fracture behavior of a CuZr-based bulk amorphous alloy with Ti additionCHEN Ding(陈鼎), DONG Jian-feng(董建峰), MA Guo-zhi(马国芝)(College of Materials Science and Engineering......
Towards understanding twinning behavior near fracture surface in magnesiumHao Li1,Qinghui Zeng2,Pengfei Yang3,Qi Sun1,Jianmin Wang4,Jian Tu5,Minhao Zhu11. Key Laboratory of Advanced Technologies... for magnesium and its alloys. Especially, {1011} twin is usually thought to be closely related to the fracture or fatigue process of magnesium alloys. In the present work, the characteristics of microstructure......
results in the loss of KIC. However, the coarsened grains in the thicker plate make cracks deflected and closure effect enhanced due to surface roughness increased. For both of plates, in the fracture surface subjected plain strain, a transition from transgranular dimpled fracture to intergranular dimpled fracture is observed during the fracture process.Key words:7050-T7451 plate; strength......
in axial stress fatigue test were examined in a scanning electron microscope (SEM) to determine the predominant macroscopic fracture mode and to characterize the features on the fatigue fracture surface... accounts for 2/3 of the whole fracture surface, while 1/2 at stress of 400 MPa. Fig.6 Fractographs of fatigue fracture samples at different stresses amplitude: (a) 400 MPa; (b) 250 MPa Fig.7 shows......
whole crack, leading to the fracture surface. Low deformation temperature and too many forging passes during the deformation will promote the nucleation of interfacial microcrack inside the specimens... height, respectively. The fracture surface and metallographic sections perpendicular to the failure surface (vertical sections) of the rupture specimens (Fig.3) and at least 4 different regions......
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increases linearly with Si3N4 volume fraction. At a lower Si3N4 volume fraction, more tearing ridge and dimples with elongation are observed. T6 heat treatment shows minor effect on the fracture surface of composite.Key words:Si3N4/Al composite; microstructure; bending properties; fracture surface......