نتایج جستجو برای: johnson cook model

تعداد نتایج: 2123370  

Journal: :Structures 2021

This paper presents an experimental investigation on the dynamic mechanical performance of S30408 austenitic stainless steel (ASS) under elevated temperatures, which is essential for determining behaviour structures made with this type subjected to coupled fire and impact/explosion. For purpose, quasi-static compression tests using Split Hopkinson Pressure Bar (SHPB) were conducted temperatures...

Journal: :Mechanics of Materials 2021

Compressive response of a novel Fe38·5Mn20Co20Cr15Si5Cu1.5 high entropy alloy with transformation induced plasticity made by laser powder bed fusion was studied at quasi-static, medium and strain rates. Mechanical variation in work hardening rate were correlated ? (f.c.c.) ? ? (h.c.p.) martensitic transformation, subsequent phase evolution adiabatic heating. A strong near basal {0 0 1} texture ...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده علوم پایه 1391

تخصیص منصفانه برای اولین بار طی مقاله ای توسط cook , kress بیان گردید.ایده ی اساسی بیان شده در این مقاله بر دو اصل استوار بود:اصل تغییر ناپذیری واصل حداقل پاراتو ورودی.سپس cook , zhu مقاله cook , kress را توسعه داده و در مقاله خود با عنوان تخصیص منابع و هزینه های مشترک به واحدهای تصمیم گیری (dmu) روشی برای چگونگی این تخصیص ارائه دادند. ولی ruiyue lin در مقاله خود با عنوان تخصیص هزینه و منابع ثا...

Objectives Hypertension is the most common cause of stroke and kidney failure in the elderly and medication adherence is vital in controlling complications. This study aims to determine the effect of the Johnson model-based program on medication adherence among the elderly with hypertension. Methods & Materials The present study was a clinical trial that was performed on the elderly with hyper...

Journal: :World Journal of Engineering and Technology 2022

Non-linear numerical modeling, widely used in research and development to understand many complex processes such as forming or machining, does not guarantee the success of a study be performed. Indeed, simulation uses finite element codes where models already integrated are based on shapes adjustable any type study. In this study, new form non-linear constitutive flow law Modified Zerilli-Armst...

Journal: :Journal of Aerospace Technology and Management 2021

Paraffin wax has been identified as a hybrid rocket motor fuel, which offers enhanced regression rates and improved combustion performance. While various investigations into the performance of this class fuels are being conducted around world, consideration its structural is often overlooked. The research presented here establishes simplified, yet accurate method defining paraffin fuel grain to...

Journal: :Fracture and Structural Integrity 2022

Laser shock peening (LSP) is used to enhance surface quality of the metallic structures by generation compressive residual stresses on it. This work studies effect main LSP parameters stress fields finite-element method. The specimen under investigation a square plate with thickness 3 mm made Ti-6Al-4V. performed analysis enhances understanding application manufactured from this material and in...

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