...Nihal Yumak; Kubilay Aslantaş In this study, the fatigue crack propagation behavior of Ti-15V-3Al-3Sn-3Cr alloy, in which aging treatments were applied, was investigated under constant and variable amplitude loading. Single-step and duplex (pre-aging + second-step aging) aging have been conducted...

...Anindito Purnowidodo; Shingo Fukuzato; Akihide Saimoto; Chobin Makabe The purpose of the present study is to evaluate fatigue crack propagation after tensile overloading. A 6-mm long u-shaped notch was cut in the center section of the specimen. Notch root radii of 0.1, 1, and 2 mm were chosen for ρ...

... of required cycles is measured. 03 06 2004 13 10 2005 22 03 2006 stress intensity factor critical crack length inelastic stresses alternative theory of fracture mechanics fatigue crack propagation References Griffith , A. A. , “ The Phenomena of Rupture and Flow...

.... This behavior was examined by direct observation of the cracks. The nal fracture pattern showed the initiation of many shear-mode cracks and their succeeding coalescence. From those observations, we considered the formation of a factory-roof pattern model. KEYWORDS: fatigue crack propagation, factory-roof...

..., the residual fatigue life after overloading became longer or shorter, depending on the overload level and baseline stress conditions. 23 03 2004 10 11 2004 30 03 2005 fatigue crack propagation overload negative stress ratio retardation acceleration crack opening residual stress...

... determined at ambient temperatures in metallic materials can be applied readily to elevated temperature measurements in silicon carbide. KEYWORDS: crack monitoring, electrical-potential method, ceramics, fatigue crack propagation, elevated temperatures been confined to visual and elastic compliance methods...

...C Makabe; H Kaneshiro; S Nishida; H Sakihama The fatigue crack propagation law was investigated for the two cases of crack propagation in a region of welding residual stress and after overloading. In the former case, the crack propagation rate d a /d N was found to depend on the stress ratio R...

... thc avcragd optral crack length and that tnferred from compliance was not observed Pmslbk reawns of thrs discrepancy are dlrusscd. and the crack front Idp rnfrrrrd 13 rxplalned m t e r n of the corntrarnt KEY WOLUIS: compliance. crack front behavmr. crack length mra\uremena. fatigue crack propagation...

...WV Vaidya Near-threshold fatigue crack propagation behavior of a high strength steel was investigated in laboratory air under closurefrec testing conditions at R = 0.7 (= R cff ) and at two different K -gradients. Depending on the criterion assumed, the threshold value differed; the criterion...

...H Masuda; S Matsuoka To predict fatigue crack growth rates under variable loading conditions, a new fatigue test method was developed. Fatigue crack propagation properties were studied for HT80, SM50B, and SUS304 steels. Test results showed that the acceleration of the crack propagation rate...