Explore chapters and articles related to this topic
Metallic Armour Materials and Structures
Published in Paul J. Hazell, Armour, 2023
Rolled homogeneous armour (RHA) has been used extensively as an armour material for nearly a century. It is usually used in depth-of-penetration testing as the benchmark for testing armour materials. It is also used in describing the performance of armour systems or materials in terms of RHA equivalences, that is, the thickness of RHA required to defeat a given projectile when compared to a specific armour system that is able to defeat the same projectile.
Improving the performance of a multi-layer armored system subjected to shock loading of an underwater explosion
Published in Mechanics of Advanced Materials and Structures, 2022
Mahdi Gerdooei, Mohammad Javad Rezaei, Hasan Ghaforian Nosrati
Rolled homogeneous armor (RHA) steel, is a kind of single-layer armor steel, whose mechanical properties improved through hot rolling. This type of steel is used in the body of tanks, vehicles, and military equipment. Nevertheless, the necessity of protecting the structure against the ballistic impact, explosive shock waves, as well as reducing the structure weight, led to the employing of multi-layered structures instead of single-layer ones. Composite armors, known as multi-layer armored systems, consist of a hard ceramic layer and either a backplate of metal or fiber-reinforced composite. Hard ceramic layer functions as a pressure scattering part, especially against the high impacts. Also, metallic plates are used as a backplate to improve the tensile strength of the structure and to reduce the deformation.
Experimental investigation of Rice Husk Ash on compressive strength, carbonation and corrosion resistance of reinforced concrete
Published in Australian Journal of Civil Engineering, 2021
Nahida Nisar, Javed Ahmad Bhat
Durability of RC is greatly affected by the corrosion of reinforcement, particularly in aggressive environments, thus compromising its service life. The use of corrosion inhibitors can help in preventing the process of corrosion as it cannot be eliminated completely. Being toxic, hazardous to environment and expensive, inorganic inhibitors have been interdicted and discovery of new inhibitors that prove to be cost effective, non-toxic and friendly to environment came into existence. RHA being a waste and agricultural by-product has been proven to be advantageous in increasing strength, reduction in construction costs, environmental friendly and improving other durability properties. This study, therefore, investigates the effect of RHA as a green corrosion inhibitor on the durability of RC.
Modeling and experimental calibration of the corrosion of RHA steel in immersion and salt-fog environments
Published in Corrosion Engineering, Science and Technology, 2019
Lydia A. Jordan, M.A. Tschopp, Todd E. Mlsna, David Wipf, M.F. Horstemeyer
Steel alloys are the most widely used engineering material [1] with extensive applications in marine, transportation, mining, and construction industries, to name a few. Armour steels, which are low-carbon steel alloys, have been used heavily for armoured vehicles and defense purposes as these steels have good ballistic impact resistance [2,3]. In particular, rolled homogeneous armour (RHA) steel is extensively used for a wide range of applications relating to military and defense. However, the corrosion of armour steels and specifically RHA steel has not been well characterised. Corrosion has immense practical importance in terms of both economic impact and safety concerns. Corrosion is a complex process consisting of various interrelated phenomena that vary with the environment of the application. Aqueous and atmospheric, and industrial and military have different environments that must be studied when considering corrosion prevention. Each application may require unique efforts for adequate corrosion prevention. As such, many different aspects of corrosion prevention in iron and various steels in different environments have been used and modified over the years.