× خانه ژورنال ها پست ها ثبت نام ورود

the effect of carbon nanotubes on buckling analysis of embedded oil pipes resting on elastic medium

نویسندگان

hassan rahimipour islamic azad university-khomeinishahr branch, country iran

afshin manouchehrifard islamic azad university-khomeinishahr branch, country iran

چکیده

the theoretical and experimental investigation on the thermo-mechanical properties of carbon nanotube (cnt) as reinforcer for oil and gas pipes has increasingly become a hot research area for many engineers and material scientists in recent years. this is mainly due to the advent of the new composite material systems that exhibit exotic material and mechanical properties as compared to the traditional, carbon fiber-reinforced composite structures. in this study, the effect of carbon nanotube (cnt) on the buckling of the embedded sea lines is investigated. the sea lines are simulated with isotropic cylindrical shell subjected to thermal and mechanical loads. the sea line is reinforced by armchair carbon nanotubes (cnts) where characteristics of the equivalent nanocomposite being determined using mori-tanaka model. the elastic medium is modelled using pasternak foundation. the governing equations are obtained based on strain-displacement, stress-strain and energy relations as well as hamilton's principal. the influences of volume percent of cnts in sea lines, geometrical parameters, elastic medium constants, temperature change and poison ratio on the buckling load of the system are investigated. results indicate that the buckling load of the sea line increases with increasing volume percent of cnts in sea lines. hence, the cnts are very useful as reinforcer for sea lines in order to increase of the buckling load of the system.

جستجوی کلمه کلیدی

buckling
cnts
sea lines
mori
tanaka model.

برای دسترسی به متن کامل این مقاله و 10 میلیون مقاله دیگر ابتدا ثبت نام کنید.


ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

ورود

منابع مشابه

Nonlinear free vibration analysis of double-walled carbon nanotubes (DWCNTs) embedded in an elastic medium is studied in this paper based on classical (local) Euler-Bernoulli beam theory. Using the averaging method, the nonlinear free vibration responses of DWCNTs are obtained. The result is compared with the obtained results from the harmonic balance method for single-walled carbon nanotubes (...

Nano structures such as nanowires, nanobeams and nanoplates have been investigated widely for their innovative properties. In this paper the buckling of nanowires surrounded in a Winkler - Pasternak elastic medium has been examined based on the nonlocal Euler-Bernoully model with considering the surface effects. In the following a parametric study that explores the influence of numerous physica...

در این پایان نامه تاثیر دو نوع تست جزیی نگر و کلی نگر بر به یادسپاری محتوا ارزیابی شده که نتایج نشان دهندهکارایی تستهای کلی نگر بیشتر از سایر آزمونها است

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

abstract in a protocol analysis of second language writing from 20 adult english as a foreign language (efl) iranian students, this research observed how language-switching (l-s), i.e., first language use in l2 writing, was affected by l2 proficiency. switching interactively between first (l1) and second (l2) languages has been recognized as one of the salient characteristics of l2 writing....