Stress cracking is an important threat to steel industries. When certain conditions are created in the environment of steel, the loading of this defect leads to intergranular cracks in the radial-axial plane. These cracks can grow under continuous adverse loading and ev More
Stress cracking is an important threat to steel industries. When certain conditions are created in the environment of steel, the loading of this defect leads to intergranular cracks in the radial-axial plane. These cracks can grow under continuous adverse loading and eventually lead to rupture. A lot of research and experiments have been done in this regard. This article is a review of the combination of conditions governing steels that lead to the growth of stress cracking. Failures caused by stress cracking occur in a long period during several stages such as germination, crack growth and final failure. On the other hand, we know that stress cracking depends on environmental, metallurgical and mechanical conditions. Therefore, in this article, the purpose of investigating the loading conditions at each stage of stress cracking and the effects of repetitive stress on steels will be discussed. Also, the synergistic effects of different parameters during the entire life cycle of steels will also be discussed. The main focus of this review is to relate the loading conditions at each stage of crack propagation, which plays an important role in estimating the remaining life of steels susceptible to stress cracking. This discussion will include how cyclic loading conditions can change steel properties and contribute to the initiation of intergranular cracking. Finally, the modeling of stress crack growth will be discussed and suggestions such as failure analysis due to stress crack growth on sheets were given.
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Glass Laminate Aluminum Reinforced Epoxy consist of three or more layers of Al alloy and fibers alternatively. Fatigue crack growth rates in notched fiber-metal laminates under constant amplitude fatigue loading were studied numerically and were compared with them in mo More
Glass Laminate Aluminum Reinforced Epoxy consist of three or more layers of Al alloy and fibers alternatively. Fatigue crack growth rates in notched fiber-metal laminates under constant amplitude fatigue loading were studied numerically and were compared with them in monolithic 2024-t3 Al alloy plates, it’s shown that the fatigue life of Glare is more longer than monolithic 2024-t3 Al alloy plate and crack growth rate in Glare panel remain constant mostly even when crack is long. stress intensity factor for given crack tip position is determined by a finite element method in ABAQUSE system.
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Creation and propagation of crack is unwanted. It occurred because of a lot of things for example periodic force on specimen, elongation due welding, defect and hole due casting, thermal stress and so on. Although changing a part of structure is time consuming and need More
Creation and propagation of crack is unwanted. It occurred because of a lot of things for example periodic force on specimen, elongation due welding, defect and hole due casting, thermal stress and so on. Although changing a part of structure is time consuming and need more money, finding a method to repair is very useful. For example in aerospace engineering and metal structure study repair of crack is very important that it has been studied for long time with kind of method.In this first represent kind of prevent of crack and restoration crack. After that report best method for each category (metal, plastics and …).
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In the present paper, the main purpose is estimated path of crack growth under multi-axial loading. So, used plate with a center rectangular notch that has an initial crack with 5 mm length and 〖-55〗^°angle. At the First, has been obtained stress intensity factors o More
In the present paper, the main purpose is estimated path of crack growth under multi-axial loading. So, used plate with a center rectangular notch that has an initial crack with 5 mm length and 〖-55〗^°angle. At the First, has been obtained stress intensity factors of failure mode I and II by using ABAQUS software. Next has been calculated equivalent stress intensity factor and estimated path of crack growth by using the maximum environmental stress method. This trend has been continued to finish failure.
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مدل کردن انتشار ترک به روش اجزا محدود تحت شرایط مختلف بارگذاری از اهمیت فوق‎‎‎العاده‎ای در مکانیک شکست برخوردار است. در این مقاله، با استفاده از علم مکانیک شکست الاستیک خطی، فرآیند رشد ترک بر اساس معیار حداکثر تنش اصلی که توسط ضرایب شدت تنش بیان می‎& More
مدل کردن انتشار ترک به روش اجزا محدود تحت شرایط مختلف بارگذاری از اهمیت فوق‎‎‎العاده‎ای در مکانیک شکست برخوردار است. در این مقاله، با استفاده از علم مکانیک شکست الاستیک خطی، فرآیند رشد ترک بر اساس معیار حداکثر تنش اصلی که توسط ضرایب شدت تنش بیان می‎‎شود، تحلیل می‎گردد. همچنین، روشی برای تصحیح جهت انتشار ترک در آنالیز اجزا محدود بیان شده تا بتوان در تحلیل‎های مختلف یک مسئله با در نظر گرفتن پیشروی‎های متفاوت ترک، در نهایت مسیر ترک واحدی به‌دست آورد. در هر مرحله از پیشروی ترک، جهت تحلیل ناحیه‎ی تنش منفرد نوک ترک از المان‎‎های منفرد در روش اجزا محدود استفاده می‎شود. نتایج چنین تحلیلی برای چندین مدل با هندسه‎های مختلف آورده شده است.
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