دانلود رایگان مقاله لاتین آسیب خزش برای لحیم از سایت الزویر
عنوان فارسی مقاله:
تاثیر موقعیت شکاف در آسیب خزش برای لحیم کردن مشترک
عنوان انگلیسی مقاله:
Effect of notch position on creep damage for brazed joint
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Plate fin heat exchangers (PFHEs) are currently developed as compact heat exchanger in high temperature gas reactor (HTGR) [1,2]. At high temperature, the time dependent creep deformation may occur in plate-fin structure. The plate-fin structure is a porous structure with a number of brazed joints [3], and always has geometrical discontinuities like fillets or defects working as notches [4]. Theses notches change the uniaxial stress to multiaxial stress state, leading to the initiation and propagation of creep cracks from these notches [5,6]. For creep damage assessment under multiaxial stress, notched specimens were often employed [7]. Therefore, a study of the notch effect on creep damage taking account of multiaxial stresses is essential for the quality assurance of the brazing joints [8]. To date, the creep damage of the notched specimen has been extensively studied. Goyal et al. [9–11] studied the effect of multiaxial stress on creep rupture behaviors and found that there is a notch strengthening effect under multiaxial stress state because of the reduction of von Mises stress. Jiang et al. [12,13] investigated the effects of notch shape on creep damage development under constant loading, and found that the development of creep damage is clearly affected by applied stress, material parameter and notch shapes. Zhang et al. [14] studied the influence of the notch location on the fatigue behavior in welded high-strength low-alloy and shows that the U-notch in weld metal and parent metal will bring to ductile fracture and brittle fracture, respectively. Turski et al. [15], Zhao et al. [16] and Chen et al. [17] employed in-plane pre-compression method to introduce the residual stress fields into notched specimens and concluded that the residual tensile stress promotes creep damage and crack initiation ahead of notch tips. Yu et al. [18] presented a study of the creep damage development in heat affected zone (HAZ) induced by void growth by a new constitutive model and proved that this model could be used to account for the microstructural changes during the process of creep rupture. Ganesan et al. [19] carried out a creep test on smooth and notched sample of 316LN Stainless steel and found that the ratio of rupture life of smooth to notched specimens decreased with the increase of the nitrogen content.
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کلمات کلیدی:
Creep damage and crack initiation in P92–BNi2 brazed joint (PDF ... https://www.researchgate.net/.../273480554_Creep_damage_and_crack_initiation_in_P9... Nickel-based brazed joints are widely used at high temperatures, and it is very important to ensure the creep strength. Using three-dimensional finite element ... Effect of notch position on creep damage for brazed joint (PDF ... https://www.researchgate.net/.../305829157_Effect_of_notch_position_on_creep_dama... Oct 14, 2016 - The creep failure is the easiest to occur in surface notch, then the base notch, and the last is inside notch. The brazed joint with higher ... Notch effect on creep damage for Hastelloy C276-BNi2 brazing joint ... https://www.researchgate.net/.../282491007_Notch_effect_on_creep_damage_for_Ha... This paper studies the notch effect on creep damage for Hastelloy C276-BNi2 brazed joint, and the effects of notch type, notch radius and notch angle on creep ... Creep of brazed plate-fin structures in high temperature compact heat ... link.springer.com/article/10.1007/s11465-009-0065-2 by S Tu - 2009 - Cited by 7 - Related articles The creep damage evolution inside the brazed joint is studied by coupling the finite element method with a damage constitutive equation. The significant effect of ... Elevated temperature creep and fracture properties of the 62Cu-35Au ... link.springer.com/article/10.1007/BF02647598 by JJ Stephens - 1995 - Cited by 8 - Related articles Jul 20, 1994 - Intergranular creep damage, along with minimum values of strain to ... use of this alloy in high thermal mismatch metal-to-ceramic braze joints. [PDF]Finite element analysis of the creep crack growth of T-type brazed ... www.atlantis-press.com/php/download_paper.php?id=25872309 Keywords: T-type brazed joints; creep; crack growth; finite element method ... FEM to analyze the creep damage of 304 stainless steel brazed joints in the ...
