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Civil Engineering - Steel Rebar Tensile Testing - Lab Report - GRADED B
- Module
- Soils & Materials 1
- Institution
- University Of Portsmouth (UoP)
This experimentation aims to evaluate the tensile properties of a steel specimen.
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Steel Rebar Tensile TestingThis experimentation aims to evaluate the tensile properties of a steel specimen.
Introduction
Metals have been very important to us for a significant amount of time. Metals have original
properties such as physical, mechanical, and thermal attributes. Renowned for their hard, tough, and
strong nature, but most importantly is their ductility. This characteristic enables them to endure a
blow and a range of shaping methods.
The mechanical properties of a material can be studied through tensile testing. It provides
characteristics such as tensile strength, yield strength, modulus of elasticity, ductility, resilience, and
toughness. The results that are conducted can be useful for material testing reference.
Experimental Method
Throughout the experiment that was performed, the specimen used was steel rebar for tensile
testing. A Zwick Roell (BS EN ISO 6892-1 2019) universal testing machine was utilised in the
procedure; the steel rebar used for testing has a dimension of 12mm in diameter and 100mm in
length and was mounted in the machine’s grips. An extensometer would be mounted on the
specimen to measure the extension of the strain through elasticity behaviour.
As shown on the graph, the y-axis is the stress which has a unit of MPa; the x-axis shows the amount
of strain, which has a unit of percentage. Notice that as the stress increases so as the strain during
elasticity behaviour. Once the yield point is reached, the stress and strain rise their value until a tab
pops up stating to detach the extensometer; implying that the yield point or yield stress has been
reached. The yield point is the maximum stress throughout the elasticity behaviour stage. Attaining
the maximum stress, the extensometer is not needed.
Continuing the test, the new behaviour will occur, known as plasticity behaviour. The stress rate will
need to be increased from 2mm/sec to 5mm/sec, and the strain will rise as well. Increasing the
speed to 30mm/sec; notice that the rebar has extended its length. The specimen would
progressively experience a stretch and an elongation up until it fractures or breaks.
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