Fatigue failure is almost considered as the predominant problem affecting automotive parts under dynamic loading condition. Thus, more understanding of crack behavior during fatigue can strongly help in finding the proper mechanism to avoid the final fracture and extent the service life of components. The main goal of this paper is to study the fracture behavior of low carbon steel which is used mostly in automotive industry. For this purpose, the fractography of samples subjected to high and low stress levels in fatigue test then was evaluated and analyzed. Hardness and tensile tests were carried out to determine the properties of used steel. Also, the samples were characterized by microstructure test and XRD analysis to examine the constitute phases. The fatigue test (S-N curve) was done at stress ratio (R= -1), and the fracture examination was perform using Scanning Electron Microscope (SEM). The results of microstructure and XRD analysis were indicating that the Ferrite and a little amount of pearlite are the dominant phases of this steel. Whereas, the fractography observations reveal that the void coalescence ductile fracture is the main failure mode in samples with high stress level, while the ductile fracture (void coalescence) with Transgranular Cleavage fracture was noticed in low stress fatigue mode for this alloy.
اشكالية النظرية في العلوم السياسية : مساهمة اولية
تناول هذا البحث الدور الحيوي الذي تؤديه المراكز البحثية في دعم القضايا الاجتماعية، مع التركيز على مركز دراسات المرأة في جامعة بغداد كنموذج تطبيقي. يوضح الباحث أن هذه المراكز لا تقتصر على إنتاج المعرفة النظرية، بل تسهم بشكل مباشر في معالجة التحديات المجتمعية، من خلال تقديم رؤى تحليلية ومقترحات عملية لصناع القرار. كما ويسلط الضوء على مساهمة مركز دراسات المرأة في تعزيز المشاركة السياسية للمرأة العراقية، خاصة
... Show MoreHumans have considerations of gender male and female, and many of them have preferential male versus female, and became such considerations solid in the minds of some of the intellectuals, public and most of the people; as a fact for granted, and that's what get them to prefer of boys over females.
The line is among a nation of civilized nations did not attain what Muslims took care
Affected by agricultural products in the Levant to a lot of factors that led to the rise in prices which as a result of natural factors, the most important and most notably the earthquakes that occurred in the dates of sporadic in the Levant,
الرؤية السايكلوجية وتطبيقاتها في مسرحية الشيخ والغانية
Appearance of the Kurdish press in the Kurdish literature was affected by as set of both external and internal factors. The former was realized in the spreading of press and publications especially at the neighboring countries in the second half of the 19th century. The latter factors, external ones ,were concerned the political situations undergone by the Kurdish people who severely suffered injustice practiced by the Othman authority .All these reasons had driven the educated to migrate to search for more safe places to practice their cultural actions with absolute freedom. Consequently, the first newspaper was issued on 22/4/1898 in Cairo which pointed the birth of the Kurdish press inside and outside Kurdistan region which
... Show MoreThe Fatimids were arguing with the Abbasids in everything, even in the causes of civilization, and the Islamic moderization had matured,
The research aims at showing the media awareness for Students, especially for the students of the preparatory schools through their following the mass media in forming the cultural, educational and political database. It also aims at building a content and prospectives that make them a wide awake stratum that safeguard the society which has faced huge effects of terrorist actions.
Furthermore, it aims at knowing to what extent that students have been acquainted with the printed and electronic newspapers. Finally, it aims at knowing to what extent that they are content with the mass media in covering and
... Show Moreالسياسة الامريكية وحركة الاصلاح السياسي في السودان