نتایج جستجو برای: creep analysis

تعداد نتایج: 2832771  

2012
Holger Keitel

The prediction of long-term deformations of concrete and reinforced concrete structures has been a field of extensive research and several different creep models have been developed so far. Most of the models were developed for constant concrete stresses, thus, in case of varying stresses a specific superposition principle or time-integration, respectively, is necessary. Nowadays, when modeling...

A. FARAHNAKY A. R. YOUSEFI M. AZADIAN M. MOOSAVI-NASAB

ABSTRACT- In this study, texture profile analysis and a creep test were used to determine the textural quality attributes of fish protein isolates and conventional surimi. These isolates were made from raw materials obtained from filleting processes of Silver carp (Hypophthalmichthys molitrix) using acid and alkaline aided treatments. Texture profile analysis was performed in order to obtain ha...

Journal: :علوم و تکنولوژی پلیمر 0
سیدجلال نیک رای سعید کاظمی نجفی قنبر ابراهیمی

the creep/recovery behavior of wood flour-polypropylene was compared with medium density fiberboard (mdf) and particleboard. for this purpose, wood flour-polypropylene composites (with and without compatibilizer)were manufactured by using a laboratory twin-screw extruder. the mdf and particleboard panels were obtained from local producers. short term flexural creep tests at 30% of ultimate bend...

Journal: :جنگل و فرآورده های چوب 0
سامان قهری دانشجوی دکتری فرآورده های چندسازة چوب گروه علوم و صنایع چوب و کاغذ دانشکدة منابع طبیعی و علوم دریایی دانشگاه تربیت مدرس، نور، ایران بهبود محبی دانشیار گروه علوم و صنایع چوب و کاغذ دانشکدة منابع طبیعی و علوم دریایی دانشگاه تربیت مدرس، نور، ایران سعید کاظمی نجفی استاد گروه علوم و صنایع چوب و کاغذ دانشکدة منابع طبیعی و علوم دریایی دانشگاه تربیت مدرس، نور، ایران

the effect of impact modifier on creep behavior of wood flour- recycled polypropylene composites has been evaluated in this work. for this purpose, impact modifier (ethylene vinyl acetate) and recycled polypropylene were mixed with wood flour (50/50% w/w) as well as the impact modifier (0, 3%, 6% and 9%) by a counter-rotating twin-screw extruder to manufacture the wood flour- recycled polypropy...

ژورنال: گلجام 2010
بصام, سید جلال الدین, حسینی هاشمی, شاهرخ, شیخ زاده نجار, سعید, مجابی, سید علی,

If a carpet is put under pressure during use or storage, its thickness decreases instantly and continues to decrease slowly as the pressure is not removed. Some part of this loss of thickness is not recoverable. This phenomenon is called creep and is influenced by parameters such as temperature and humidity, and it may cause breakage, burst, crease, bump, and folding line in the carpet. By stud...

Journal: :Journal of Applied Mechanics 1981

2002
Tatsuya Tsubaki

Despite decades of intensive research, an entirely satisfactory constitutive relation for creep in concrete is still unavailable, even for working stress levels [I]. The rate-type creep laws with internal variables [2], although rather effective for numerical creep analysis of large structural systems, seem to be incapable of describing the aging phenomena without at least partially violating s...

2015
Dezheng Liu Qiang Xu Zhongyu Lu Donglai Xu

This paper reports the development of finite element software for creep damage analysis. Creep damage deformation and failure of high temperature structure is a serious problem for power generation and it is even more technically demanding under the current increasing demand of power and economic and sustainability pressure. This paper primarily consists of three parts: 1) the need and the just...

اخوان, محمد, اخوان‌فرشچی, یاسمن, علی‌آبادی, آذر,

We have studied the thermally activated flux creep of a newly fabricated superconductor Y3Ba5Cu8O18 with the superconducting transition temperature 102 K. Analysis of the transition spread from the normal state to superconducting state in the electrical resistivity revealed that the thermally activated flux creep explains the electron share in the vicinity of the transition temperature Tc. The ...

F. Rahmani, R. Kamgar, R. Rahgozar,

The purpose of this study is to evaluate the long-term vertical deformations of segmented pre-tensioned concrete bridges by a new approach. It provides a practical and reliable method for calculating the amount of long-term deformation based on creep and shrinkage in segmented prestress bridges. There are various relationships for estimating the creep and shrinkage of concrete. The analytical r...

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