بایگانی برچسب: failure

In this tutorial Simulation fatigue phenomenon of the steel plate in Abaqus by using direct cyclic step has been investigated.Two dimensional part for steel and wire part to define initial crack length has been used . Elastic material couple with traction separation law to consider the fracture and crack growth in ...

Insulated concrete sandwich panels are comprised of two outer concrete wythes and an inner layer of foam insulation. They have been increasingly used because of their advantages of light weight and energy efficiency. Various shear connectors can be used to connect the two outer concrete wythes. More recently, Fiber-Reinforced Polymer ...

Explosions, whether accidental or planned, can cause significant damage to the built infrastructure and result in fatalities to occupants of buildings in close proximity to the center of explosion. The increase in the number of terrorist attacks over the past few decades has led to growing concerns about the performance ...

Sandwich panels are widely used in lightweight construction especially in aerospace industries because of their high specific strengths and stiffnesses. In the service life of a sandwich panel, impacts are expected to arise from a variety of causes. Debris may be propelled at high velocities from the runway during aircraft ...

Honeycomb sandwich structures are broadly used in the aerospace and automotive industries, particularly as energy-absorption materials, and there are limited applications in civil infrastructure, such as highway bridges and building construction. Due to their unique and advantageous properties such as high mechanical performance per unit weight and high energy-absorption capability, ...

Nowadays, a high risk of terrorist attacks is observed. Bombing attacks are the most frequent terrorist activities. Unfortunately, public infrastructure such as airports and railway stations, shopping centres, offices, financial and government institutions are highly exposed to such attacks. There were also several cases of such attacks with thousands of ...

Blast incidents in recent years show that most of the terrorist attacks on public structures were explosions within short stand-off distances. In this context, columns are the most vulnerable structural components and their failure is the primary cause for progressive collapse in framed structures. On the other hand, many of ...

در این ویدئو به شبیه سازی قدم به قدم انفجار روی یک تیر بتنی تقویت شده با میلگرد در نر افزار آباکوس- بررسی پارامتر تخریب- پرداخته ایم.برای مدلسازی تیر بتنی از مدل سالید سه بعدی و برای میلگردها که در ماژول متریال به آنها المان تیر یا بیم نسبت داده شده ...

An understanding of the response of brittle and ductile materials under hyper velocity impact is  required for analysis of the space debris and micro meteoroid impact flux via retrieved spacecraft  surfaces. Brittle material surfaces exposed in Low Earth Orbit include solar arrays and windows.  Laboratory experiments are able to access ...

در این ویدئو به شبیه سازی قدم به قدم برخورد توپ حاوی گاز به شیشه و بررسی شکست آن در نرم افزار آباکوس پرداخته ایم. مدلسازی به صورت سه بعدی بوده و توپ به صورت یک پارت شل و شیشه به صورت سالید مدل شده اند.برای توپ از ماده ای مشابه ...

With the increased world tension, terrorist bombing attacks or accidental explosions are becoming a large threat to infra-structure such as the important economic, military and civilian facilities. The research on the antiknock safety of structures has increasingly attracted people’s attention. In order to meet the ever increasing demand for power, ...

I this tutorial two model of masonry wall has been investigated. The first model without out FRP and the second model with FRP. In the first model Masonry is the oldest structural material still in use for a vast variety of construction. It has been continually employed for differ-ent construction ...

The material constitutive relationship is not only the conclusion of some regulations summarized from experimental data, but also plays an important role in numerical simulations. It reflects the realistic physical and mechanical properties of materials as much as possible to improve the accuracy of numerical results. At present, various kinds ...

Recent terrorist attacks not only targeted on government buildings, but also on some random civilian structures such as hotels, shopping centers and traffic stations. This imposes a great challenge on attack preventions since it is impractical to deny public access to these structures. Once terrorist attack is not success-fully prevented ...

The material constitutive relationship is not only the conclusion of some regulations summarized from experimental data, but also plays an important role in numerical simulations. It reflects the realistic physical and mechanical properties of materials as much as possible to improve the accuracy of numerical results. At present, various kinds ...

در این ویدئو به شبیه سازی برخورد سرعت بالای یک پرتابه به صفحه سنگی(گرانیت) و بررسی آسیب بوجود آمده در  آن در نرم افزار آباکوس پرداخته ایم. سنگ گرانیت از جمله مواد ترد بوده که برای مدلسازی آن ،آباکوس چندین متریال مدل مختلف را در  محیط CAE,INP و در قالب سابروتین ...

Masonry is the oldest structural material still in use for a vast variety of construction. It has been continually employed for differ-ent construction purposes. Old masonry structures were designed and constructed without any complicated mathematics, but through the expert masons with trial and error methods. In the last few decades ...

در این ویدئو به شبیه سازی قدم به قدم انفجار روی یک ستون دو پوسته ای فولادی پر شده با بتن با متریال مدل هلمکوئیست جانسون در نرم افزار آباکوس پرداخته ایم.در این مسئله ستون به صورت دو قوطی داخلی و بیرونی با استفاده از دو پارت سالید مدل و ماده ...

The critical mechanical characteristics governing the usability of concrete containing wood shavings as aggregates are mechanical strength and durability.There is a renewed interest in the use of wood-based composite materials because of their ability to regulate indoor climate. Numerous studies have shown that the hygroscopic behavior of materials of vegetable ...

In this video Simulation air blast explosion over sandwich plate(steel-Epoxy glass) in Abaqus has been investigated.In this example two steel plates as solid part with four epoxy glass layers as continuum shell part are used . Composite section is placed inside two steel plates. You can see a schematic and position ...

The use of composite materials in critical aerospace structures is still limited by their relatively weak mechanical response to impact events. In addition, composite laminates subjected to low velocity impact such as dropped tools or vehicle impact, exhibit significant internal damage and delamination, with little indication on the impact surface ...

در این ویدئو به شبیه سازی برخورد جسم صلب به صفحات کامپوزیتی CFRP در نرم افزار آباکوس پرداخته ایم.الیاف کربن نخستین بار در سال ۱۸۷۹ میلادی زمانی که ادیسون از این ماده به عنوان رشته پر مقاومت در ایجاد روشنایی الکتریکی استفاده کرد، پای به عرصه علم گذاشت. در آغاز دهه ...

One of the major problems confronted by the designer of submersibles is to minimize the weight of the pressure hull for increasing the payload of a crew and necessary equipment and to simultaneously enhance the strength of the pressure hull for withstanding hydrostatical pressure, underwater explosive loading and other environmental ...

در این ویدئو به شبیه سازی انفجار در هوا روی یک پنل ساندویچی متشکل از جی اف آر پی و فوم در نرم افزار آباکوس پرداخته ایم. مدلسازی به صورت سه بعدی انجام شده که مجموعه به صورت چهار لایه GFRP ، لایه میانی فوم ضخیم و دو لایه GFRP ...

This paper presents the response of pile foundations to ground shocks induced by surface explosion using fully coupled and non-linear dynamic computer simulation techniques.Significant increase of terrorist attacks against significant and iconic buildings and other infrastructure components high-light the need for the blast resistant design of the structures. Blast loads ...

In this video Simulation high-velocity impact of a ceramic target with Johnson–Holmquist material model has been studied.Ceramic materials are commonly used in armor protection applications. In recent years Johnson, Holmquist, and their coworkers have developed a series of constitutive relations to simulate the response of ceramic materials under large strain, high-strain ...

در ای ویدئو به شبیه سازی قدم به قدم  برخورد  یک پرتابه سرعت بالا به هدف سرامیکی در آباکوس با استفاده از مدل جانسون هلمکوئیست پرداخته ایم. اجزا به صورت سه بعدی بوده و برای پرتابه متریال طلا و برای سرامیک نیز از متریال مدل جانسون هلمکوئیست که در نرم افزار ...

In this tutorial Simulation air blast load over reinforced concrete wall with Johnson-Holmquist behavior in Abaqus has been investigated. Dynamic explicit step with conwep air blast procedure are appropriate for this analysis.The JH-2 model is a constitutive model suitable to predict the behaviour of brittle materials subjected to extreme loading. The ...

در این ویدئو به شبیه سازی قدم به قدم  انفجار به روش کانوپ روی دیوار بتنی مسلح به میلگرد با متریال مدل جانسون هلمکوئیست در  نرم افزار آباکوس پرداخته ایم. میلگردها به صورت وایر و با المان بیم مدل شده اند. برای بتن با توجه به اینکه متریال مدل های موجود ...

Concrete is a widely used material in the construction of strategic and important structures such as nuclear containments, bridges, storage structures and military bunkers. In the present study perforation experiments and simulations on finite element code ABAQUS/Explicit have been carried out to understand the behavior of concrete against projectile impact.The ...

در این ویدئو به شبیه سازی برخورد پرتابه صلب به هدف بتنی با مدل ماده JH2 در نرم افزار آباکوس پرداخته ایم. پرتابه به صورت صلب مدل شده و هدف بتنی به صورت تغییر شکل پذیر در نظر گرفته شده است. آباکوس متریال مدلهای مختلفی را برای بتن ارائه می دهد ...

The work presented in this paper deals with application of explicit finite element analyses in order to predict bird strike induced impact damage on A very common example of foreign object impact in air trans-port is bird strike. Due to increased density of the air transport and changing migration routes ...

In this video Simulation block joist analysis under bending load in Abaqus has been studied. Concrete slab is modeled as three dimensional part with elasticity and concrete damage plasticity as property.To view tensile damage during analysis Tensile Damage behavior has used. Beads are modeled as three dimensional wire part with elastic ...

در این ویدئو به شبیه سازی بارگذاری استاتیکی تیرچه بتنی به همراه میلگرد در نرم افزار آباکوس پرداخته ایم.مدل از دو هندسه مجزا تشکیل شده است. پارت بتنی به صورت سه بعدی و برای میلگرد از وایر استفاده شده که برای متریال میلگردها از خاصیت الاستیک و پلاستیک و برای بتن ...

Far-Field UNDEX models must typically treat two UNDEX phenomena: shock loading and cavitation. Shock loading occurs as a result of the incident explosive shock wave impinging on the wet-surface of the ship structure. Cavitation occurs because the pressure in the surrounding water drops below its vapor pressure due to the ...

Buried pipelines are among the most important elements of lifelines used for distribution of water, gas, oil, etc. Buried pres-surized gas pipelines are likely to be endangered by accidental explosions in process industries, explosives factories, open pit mines, quarries, public works or even intentional explosions near a pipeline Multiple explosions ...

در این ویدئو به شبیه سازی انفجار درون خاک در نزدیکی لوله مدفون به روش اویلری لاگرانژی در نرم افزار آباکوس پرداخته ایم. برای ایجاد جریان مواد درون خاک و هوا از تکنیک مدلسازی اویلری و برای لوله از مدل لاگرانژی استفاده شده است. برای خاک از مدل پلاستیسیته کلمب موهر، ...

This Tutorial presents the results of the numerical investigation into the effects of welded blast loaded stiffened plates.The blast response of stiffened plates has been studied in the past. In this video CONWEP explosion over the steel plate with stiffener and welded zone has been studied. Johnson Cook plasticity for plate ...

In this example we consider an analysis of the Koyna dam, which was subjected to an earthquake of magnitude 6.5 on the Richter scale on December 11, 1967. The example illustrates a typical application of the concrete damage base on traction separation laws. Dam is modeled as two dimensional part ...

در این ویدئو به شبیه سازی رشد ترک در سد بتنی کوینا در نرم افزار آباکوس تحت بار زلزله پرداخته ایم. در این مثال که نتایج آن در هلپ آباکوس برای شکست کششی موجود می باشد، از متریال مدل مناسب برای رشد فیزیکی ترک بهره برده شده است. مدل به صورت ...

This paper focuses on the mechanical behavior of aluminium alloy under impact loading. This study has been carried out numerical techniques.The impact-protective capacity of structural components has be-come a relevant requirement for the automotive and aerospace industries. Both energy absorption and crash worthiness concepts are essential for the development of new ...

در این ویدئو به شبیه سازی برخورد پرتابه سرعت بالا به ورق آلومینیومی و بررسی آسیب آن در نرم افزار آباکوس پرداخته ایم. ورق به صورت سه بعدی بوده و برای آن از معیار پلاستیسیته و آسیب جانسون کوک استفاده شده است.پرتابه به صورت صلب در نظر گرفته شده است. در ...

In this tutorial simulation composite three points bending in Abaqus has been done. Composite parts are modeled as three dimensional part with continuum shell element . Epoxy-Glass material with Hashin’s damage criterion to model composite behavior under bending load has been implanted.This simulation normally is done by static solver but in ...

A growing number of terror attacks all over the world have become a threat to the human civilization.In the last two decades, bomb blasts in crowded business areas, underground railway stations, and busy roads have taken numerous lives and destroyed properties in different parts of the world. However, blast response ...

در این ویدئو به شبیه سازی مرحله به مرحله  انفجار در نزدیکی ستون بتنی کاور شده با ورق فولادی در آباکوس پرداخته ایم. برای مدلسازی انفجار از روش انفجار در هوا یا همان روش کانوپ بهره برده شده است. مدلسازی به صورت سه بعدی بوده و ورق استیل به منظور ایجاد ...

In this video simulation steel can under compression load in Abaqus has been studied. To model can geometry with details import capability was used. In the below figures schematic of all geometry has been showed The steel can is modeled as elastic plastic material model and Johnson-Cook plasticity is appropriate for ...

An explosion on the ground surface can cause significant damage to a tunnel located at a shallow depth below groundA comprehensive approach to simulate the effects of an explosion occurring inside a buried infrastructure tunnel on the soil surface and on nearby tunnels is presented. The approach considers all the ...

The progressive collapse of structures under blast loading has attracted great attention all over theworld. Some guidelines give specific procedures to analyse the progressive collapse of building structures.Progressive collapse refers to the failure of one or a group of key structure load-carrying members that gives rise to a more widespread ...

In this tutorial air blast explosion inside reinforcement concrete room in Abaqus has been investigated. The concrete room is modeled as three dimensional part with CDP material to predict compressive  and tensile damage. Reinforcement is used as beam part by wire element ans steel material. Dynamic explicit procedure is appropriate for ...

In this video Simulation high velocity bullet impact to three layers plate in Abaqus has been investigated. To model all part three dimensional space was used. Ductile and Shear damage with evolution for modeling steel behavior, Johnson-Cook damage and plasticity for modeling aluminium behavior and Ductile damage couple with Drucker-Prager plasticity for ...