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Simple Stresses and Strains
Published in B. Raghu Kumar, Strength of Materials, 2022
Strength of materials is a branch of applied mechanics that deals with the behavior of solid bodies subjected to various types of loading. The main objective of this subject is to determine the stresses, strains and deflections produced by loads. If these quantities can be found for all values of load up to failure load, then we will have a complete picture of the mechanical behavior of the body.
Semi-Submersibles under Impact Loads
Published in Srinivasan Chandrasekaran, Offshore Semi-Submersible Platform Engineering, 2020
Offshore structures face a variety of challenges from the environmental and accidental loads when deployed in the Arctic region. Prevailing low temperatures induce additional threats by affecting the performance of materials. The lowest temperature in the Arctic islands and continental regions during winter has been recorded at –60°C. Structural steel used in the construction of offshore platforms suffers reduced toughness at such a low temperature. It, in turn, affects the performance of the structure. The reduced temperature in the Arctic region affects the material properties significantly. At low temperature, tensile strength and yield strength of materials increases and toughness decreases. The decrease in toughness significantly affects the performance of the structures. Thus, the major problems that arise in steel are brittle fracture and corrosion. The steel material for application in the Arctic environment must satisfy the fracture toughness requirements at temperatures between –40°C to –60°C. The toughness can be increased by decreasing the grain size of steel and the addition of magnesium, copper, chrome, and nickel (Jumppanen, 1984). Thus, the ice environment plays a major role in the design and operation of offshore platforms deployed in the Arctic region.
Introduction to Mechatronic Systems
Published in Bogdan M. Wilamowski, J. David Irwin, Control and Mechatronics, 2018
In material science, strength of materials is one of the branches that studies the relation between applied stress and relative deformation in size and probes into the ability of a material to withstand an applied stress without failure. It provides mechanical engineers with an awareness of various responses exhibited by solid engineering materials when subjected to mechanical and thermal loadings. It is an introduction to the physical mechanisms associated with the design-limiting behavior of engineering materials, especially stiffness, strength, toughness, and durability. It provides an understanding of the basic mechanical properties of engineering materials, testing procedures used to quantify these properties, and ways in which these properties characterize material response. It proposes quantitative skills to deal with materials-limiting problems in engineering design, and suggests a basis for materials selection in mechanical design.
Hydroxyapatite for bone related applications derived from sea shell waste by simpleprecipitation method
Published in Journal of Asian Ceramic Societies, 2020
C. Suresh Kumar, K. Dhanaraj, R.M. Vimalathithan, P. Ilaiyaraja, G. Suresh
While adding the polymers, values of all the structural parameters (ε, δ and SF) are increased (Table 1), especially NHAp/PVP shows high values. Thus, NHAp/PVP exhibits good plastic deformation and hardness. Grain size decreases with increasing strain lead to increases in the dislocation density and strength of materials. The same observations were achieved in the following literature [53]. The increases in structural parameters (ε, δ and SF) confirm the decrease in the crystalline nature (Table 1). According to de Carvalho Almança Lopes et al. [2], the presence of CO32- in the HAp structure could be highly important because it could be the main source of distortion of the crystalline network, creating micro-stresses and defects in its vicinity, greatly influencing its solubility. This is achieved in the present study and hence NHAp/PVP has favorable mechanical property and solubility for biomedical applications.