نتایج جستجو برای: early fatigue destruction

تعداد نتایج: 785789  

2014
Xi-Shu Wang Xing-Wu Guo Xu-Dong Li Dong-Yun Ge

In this paper, rotating bending fatigue tests of 2024-T4 Al alloy with different oxide coatings were carried out. Compared to the uncoated and previously reported oxide coatings of aluminum alloys, the fatigue strength is able to be enhanced by using a novel oxide coating with sealing pore technology. These results indicate that the better the coating surface quality is, the more excellent the ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه محقق اردبیلی - دانشکده علوم کشاورزی 1393

شب پره ی مینوز برگ گوجه فرنگی، tuta absoluta (meyrick)، آفت جدی گوجه فرنگی، lycopersicum esculentum miller می باشد. در این تحقیق ویژگی های زیستی مینوز برگ گوجه فرنگی روی پنج رقم گوجه فرنگی (به نام هایsuper strain b، super chief، early urbana y111، mobil و early urbana y) و نیز تاثیر مقادیر مختلف کود مرغی (شامل شاهد، 5، 10، 15، 20و 25 درصد در گلخانه و شاهد، 100، 200 و 300 کیلوگرم در هکتار در مزر...

2017

Hydrogen diffusion during rolling contact fatigue (RCF) is considered a potential root cause or accelerator of white etching cracks (WECs) in wind turbine gearbox bearing steels. Hydrogen entry into the bearing steel during operation is thought to occur either through the contact surface itself or through cracks that breach the contact surface, in both cases by the decomposition of lubricant th...

2014
Jianping Peng Xiaorong Gao Yu Zhang Zeyong Wang Chaoyong Peng Yu Tan Kai Yang Bo Zhao

The subsurface defect in the wheel tread caused from Rolling Stock Fatigue (RCF) has become more danger in high speed railway. The conventional UT and phased array UT have deficiency to find the subsurface defect from the tread surface because of limitation of ultrasonic near field. In this paper, the subsurface defect is studied by simulation and experimental results with ultrasonic technique....

2013
Qian Zhao Jian Na Hao Liang Yin

Damage on rail increasingly originates from the surface of the rail as a result of for example rolling contact fatigue (RCF). This is a major concern for track operators, who operate test regimes for flaw detection and monitoring. The paper aims to assess the feasibility of applying electromagnetic (EM) simulation techniques to high frequency magnetic induction sensing of flaws in a section of ...

Journal: :Journal of nematology 2008
J A Lamondia

Prompt tillage after crop harvest was investigated as a cultural control for the tobacco cyst nematode, Globodera tabacum tabacum, on stalk-cut broadleaf cigar wrapper tobacco. Stalk stumps and roots remaining after harvest were destroyed by tilling immediately or from 2 to 6 wk after harvest in field experiments over 4 yr. Cyst nematode Pf/Pi ratios ranged from 0.65 to 1.62 when plants were ti...

Journal: :Annals of the rheumatic diseases 1977
H R Schumacher B B Dorwart J Bond A Alavi W Miller

Two patients with sickle cell disease presented with joint pain and early x-ray evidence of articular cartilage loss. Both later developed increasingly destructive arthritis with chronic synovitis identified in synovial biopsies. One patient developed demonstrable aseptic necrosis. Destructive arthropathy is much less common than the frequent transient effusions in sickle cell disease.

2006
Takaya Nozawa Takashi Kozasa

We investigate the destruction of dust grains by sputtering in the high-velocity interstellar shocks driven by supernovae (SNe) in the early universe to reveal the dependence of the time-scale of dust destruction on the gas density nH,0 in the interstellar medium (ISM) as well as on the progenitor mass Mpr and explosion energy E51 of SN. The sputtering yields for the combinations of dust and io...

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