IG Cullis. Blast Waves and How They Interact With Structures.

نویسنده

  • IG Cullis
چکیده

The paper defines and describes blast waves, their interaction with a structure and its subsequent response. Explosions generate blast waves, which need not be due to explosives. A blast wave consists of two parts: a shock wave and a blast wind. The paper explains how shock waves are formed and their basic properties.The physics of blast waves is non-linear and therefore non-intuitive. To understand how an explosion generates a blast wave a numerical modelling computer code, called a hydrocode has to be employed. This is briefly explained and the cAst Eulerian hydrocode is used to illustrate the formation and propagation of the blast wave generated by a 1 kg sphere of TNT explosive detonated 1 m above the ground. The paper concludes with a discussion of the response of a structure to a blast wave and shows that this response is governed by the structures natural frequency of vibration compared to the duration of the blast wave.The basic concepts introduced are illustrated in a second simulation that introduces two structures into the blast field of theTNT charge. Introduction In both the military and civilian worlds, blast waves and their interactions with a structure need to be understood. Explosions form blast waves. These explosions can be either deliberate or accidental. Deliberate explosions can include demolition charges, weapon systems and improvised explosive devices. Accidental explosions can result from the ignition of gas clouds and inflammable liquids and chemicals due to fire or the failure of pressurised containers. In all cases the effects of the blast waves produced need to be quantified, particularly in respect of injuries to personnel. A blast wave is formed by a sudden release of energy.The source of the energy release is not important. However, for many materials, particularly explosives, the very high rate of the energy release generates a tremendous power source. It is this power source that is responsible for the catastrophic damage often associated with an explosive. The generation, development and propagation of blast waves are governed by the non-linear* physics that describes shock waves. In the case of an explosive, its’ detonation properties define the properties of the blast wave. In the military scenario, blast waves created by explosive charges are the major concern. In this paper, therefore, the detonation of 1kg of TNT is used to illustrate the main features of a blast wave interacting with structures – the ground and

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

IG Cullis. Blast Waves and How They Interact With Structures.

The paper defines and describes blast waves, their interaction with a structure and its subsequent response. Explosions generate blast waves, which need not be due to explosives. A blast wave consists of two parts: a shock wave and a blast wind. The paper explains how shock waves are formed and their basic properties.The physics of blast waves is non-linear and therefore non-intuitive. To under...

متن کامل

Blast waves and how they interact with structures.

The paper defines and describes blast waves, their interaction with a structure and its subsequent response. Explosions generate blast waves, which need not be due to explosives. A blast wave consists of two parts: a shock wave and a blast wind. The paper explains how shock waves are formed and their basic properties. The physics of blast waves is non-linear and therefore non-intuitive. To unde...

متن کامل

Magnitude of vibration triggering component determines safety of structures

Transmission of blast waves is a complex phenomenon and the characteristics vary with blast design parameters and geo-technical properties of medium. Frequency of vibration and triggering component for structural excitation generally quantifies safe vibration magnitude. At closer distance or higher elevations than the blast locations, vertical or transverse component will be the first arrival t...

متن کامل

Significance of Soil Compaction on Blast Resistant Behavior of Underground Structures: A Parametric Study

Dynamic response of underground structures has always been a topic of concern for designers and researchers. The behavior of these complicated systems under blast loading is affected by various factors and parametric studies are required to investigate their significance. The importance of soil density around the underground structure through which, the waves of explosion of a penetrator bomb i...

متن کامل

بررسی عملکرد شمع فولادی در خاک ماسه‌ای سست و متراکم تحت بار انفجاری

In recent years, with the increasing number of terrorist attacks and explosions in structures, extensive studies have been carried out on the performance of structures and their reactions under blast load. Due to the importance of the pile in the load transfer of various structures such as wharves, oil platform and bridges it is essential to study the behavior of this member. In this research, ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2008