Experiment1tensiontest - Assistant: Gkhan KIDIL MetE 206...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Assistant: Gökhan KIDIL MetE – 206 MATERIALS LABORATORY EXPERIMENT NO. 1 - TENSION TEST Cihan ÇAPCI 1514983
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1. Abstract: Throughout this report the objective of tension test, the system used in the test with its components, the experimental procedure and how it will be held, the comments about the results of a previously made experiment and the comments about the usage and importance of the tension test is covered. 2.1 Objective: The aim of this experiment is to conduct hardness test and tension test together to obtain the stress – strain diagram and by the way determine the tensile properties by this getting valuable information about the mechanical behavior and the engineering performance of the material concerned. 2.2 Specimen type, shape and dimensions: Round specimen with unknown composition which has an initial gage length of 75.5 mm and initial diameter of 12.1 mm is used to demonstrate the process of this experiment. 2.3 Testing System: The testing system consists of four main parts and these are explained below: Testing Machine: Ours was a Universal Testing Machine of hydraulic type of ALŞA company which can apply up to 60 tonnes of force upon the specimen. In the experiment concerned 12 tonnes is used. Besides the tension tests, this universal machine allows compression and bending tests to be done. Load Cell: This part provides an electrical circuit for measuring the instantaneous load along the loading axis. Power Supply: It is connected to the load cell. It feeds the load cell, amplifies the output signal and displays the load. Recorder: It plots the variation of load against time and creates a plot.
Background image of page 2
3. Experimental Procedure: First of all the elongation of the specimen is closely related with not only the composition of the material but also the hardness of it. To obtain the hardness value of the specimen, a Brinell hardness test machine with metal ball of 2.5 is used and operated with 62.5 kgf. Two trials was made: First one left a mark having 0.64 mm diameter and that corresponds to 191 Brinell from the tables. Second one left a slightly smaller mark having 0.62 mm diameter which corresponds to 204 Brinell. After the hardness test, the specimen is loaded and gripped firmly to the Alşa universal testing machine. Load is set to 12 tonnes by the instructor. A graph paper and a pencil is attached to the machine. Afterwards the machine is turned on and the tension test began. Until 7290 kgf read from the machine, the plot on the graph paper which is drawn automatically by the machine continued to increase which means that as the force applied on the specimen increasing the specimen is showing an elongation. After 7290 kgf the force applied began to decrease and this effected the plot on the graph paper to decrease which means as the length of the specimen increasing the force applied is decreasing so the sample will fracture anytime depending on its chemical composition, hardness etc. After the fracture the test ended. The final length of the specimen showed
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 17

Experiment1tensiontest - Assistant: Gkhan KIDIL MetE 206...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online