ABSTRACT
The process involved in the design and fabrication of a creep material testing equipment ranges from carrying out the feasibility studies of the project to the designed and especially of ensuring its functionality. Since it is used in the testing of failure of material under loading, different engineering principles employed in the design and fabrication includes bending moments and deflection of beam etc. the main objective of this project is to design a mechanical structure that can test the failure of substance hence creep s defined as the failure of substance under continuous loading. It also involves the cutting of the specimen that will be used to conducting the test.
After the completion of the different components of the machine, it is assembled and a test turn conducted.
As a result, it was finally observed that creep material testing equipment is used in determining the failure of material under continual loading.
CHAPTER ONE
INTRODUCTION
When a material like steel is plastically deformed at ambient temperature, its strength is increased due to work hardening. This work hardening effectively prevents any further deformation from taking place if the stress remains approximately constant. Annealing the deformed steel at an elevated temperature removes the work hardening and restores the steel to its original condition. However, if the steel is plastically deformed at an elevated temperature, then both work hardening and annealing takes place simultaneously. A consequence of this is that steel under a constant stress at an elevated temperature will continuously deform with time that is it is said to “Creep”.
Creep in steel is important only at elevated temperatures. In general creep becomes significant at temperatures about 0.HTM, where TM is the absolute melting temperature. However, materials having low melting temperature will exhibit creep at ambient temperature, lead and various types of plastic are good examples for example, lead has a melting point at 3260C (5990K), and at 200C (2930K, or about 0.5 TM) it exhibits similar creep characteristics to those of iron at 6500C.
The creep material measuring apparatus is in simple unit designed for demonstrating and investigating the creep characteristics of lead and polyurethane specimen at room temperature. A temperature module is provided to enable investigation of the effects of temperature on creep rate.
