- Category:Engineering and Construction
- Document type:Assignment
The report is exploring the problem that has been existing due to the metals that are being corroded when in the frame structure of steel. The solution to the problem is being solved by replacing the metal with another with performance characteristics that can achieve the desired results. The properties that the metal design needs to meet can include inelasticity due to severe earthquakes that do affect roads and ensure that the metal properties can resist the cyclic applications of roads. Also, the report is trying to explore the properties that can guarantee resistance to deflections that are in high amounts. The report has provided the description of the laboratory techniques and equipment needed for measuring the metal properties. This involved describing the properties of metals that can be useful in determining the performance characteristics that are desirable such as the resistance of deflection and cyclic roads. Also, the treatments and strengthening need in the process of achieving the desired properties of the meats are described. A graph has been sketched to demonstrate the relationship of the stress-strain expected relate to the four metal given to the point of their failure. Lastly, the choice of the meat that as the desired properties is justified regarding its ability to meet the performance characteristics that are desired.
The mechanism that can be used to strengthen the metal can include controlling the size of the grain; strain hardening that is aimed at tangling and creating dislocations. Besides. Allowing can be an important mechanism in the process of hardening the metal. This can entail introducing more grains for pinning the dislocations and point defects (Groover, 2002). The control of the grain size creates a barrier to the dislocations that do lead to slip and movement as the different orientations of the adjacent grains. Strain hardening entails making the metal hard using plastic deformation resulting in the generation of additional dislocations.
The heat treatment can be used in achieving the desired performance characteristics using three processes that can include recovery, recrystallization, and grain growth. The recovery process is essential in adjusting the strain of the metal as atoms can move in the course of recovering the normal position. Crystallization leads to the growth of new grain that helps in replacing the deformed grains (Hashemi, et al. 2006). The composition of the metal can include carbon steels, cast iron, copper, and lead. This metal composition can ensure that the metal can achieve the desired outcome.
The strength of a metal entirely depends on the microstructure where the engineering processes are said to alter this structure. Strengthening mechanisms change the strength of the metals using ways such as solid solution hardening, work hardening, grain boundary hardening, and precipitation hardening. The mechanisms used in making metals strong are based on the fact that some mechanical properties of metals degenerate making the metal stronger (Green, 2008). For instance using grain boundary, the strength of the metal can be maximized by decreasing the size of the grains. Dynamic loading can be critical in considering the strength of material especially in testing the fatigue problem.
Green, D., 2008. An Introduction to the Mechanical Properties of Ceramics, Cambridge Solid State Science Series, Eds.
Groover, Mikell P. 2002. Fundamentals of Modern Manufacturing, 2nd edition. John Wiley & Sons.
Hashemi, Javad and William F. Smith, 2006. Foundations of Materials Science and Engineering, 4th edition. https://www.nde-ed.org/EducationResources/CommunityCollege/Materials/Structure/strengthening.htm