-
Design And Fabrication Of A Creep Testing Equipment
CHAPTER ONE -- [Total Page(s) 2]
Page 2 of 2
-
-
-
A creep curve is a plot of the elongation of a tensile specimen versus
time, at a given temperature, under a constant load. The four stages of
creep curve is (1) initial elongation flowing the application at load,
(2) transient or primary creep, (3) steady state or secondary creep, and
(4) tertiary creep.
Below is the creep curve which shows the four stages.
THE PRIMARY CREEP
Fig
1.1: This is the stage of the curve over which the creep
rate, is de/dt, is continuously decreasing as show in the figure above.
This is of interest to a designer since it forms part of the extension
reached in a given time and may affect clearance.
THE SECONDARY CREEP
Fig
1.2: This section is a period of approximately constant
creep rate and is termed secondary creep; the creep rate is at a minimum
over this region.
This secondary stage is the region at
which creep occurs at more or less “STEADY STATEâ€. This is the
important part of the curve for most applications.
THE TERTIARY CREEP
Fig
1.3: This stage represents a continuously increasing creep
rate and terminates in fracture of the specimen as shown in the figure
above. This tends to be the final stage of the creep curve when the
rate of extension accelerates and finally leads to fracture.
CHAPTER ONE -- [Total Page(s) 2]
Page 2 of 2
-
-
ABSRACT - [ Total Page(s): 1 ]The process involves in the design and fabrication of a creep testing equipment ranges from carrying out the feasibility studying of the project to be designed in terms of functionality. Since it is used in the testing of failure of material under loading different engineering materials employed in the design and fabrication includes bending moments and deflection of bean etc. The main purpose of this project is to design mechanical system and electrical system capable of ... Continue reading---
