Its Easy to understand about tensile Strength .

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3. Introduction
 One of the fundamental methods
in material science.
 Sample is subjected to controlled
tension until failure.
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4. What is Tensile Testing
Tensile testing is a way of determining how something will
react when it is pulled apart - when a force is applied to it
in tension.
Tensile testing is one of the simplest and most widely used
mechanical tests. By measuring the force required to elongate
a specimen to breaking point, material properties can be
determined that will allow designers and quality managers to
predict how materials and products will behave in their
intended applications.
Along the tensile profile there are many points of interest,
chief among them the elastic limit and force to break or
failure point.
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5. Advantages Of Tensile Testing
 Tensile testing provides data on the integrity and safety of
materials, components and products, helping manufacturers
ensure that their finished products are fit-for-purpose and
manufactured to the highest quality.
The data produced in a tensile test can be used in
many ways including:
 To determine batch quality
 To determine consistency in manufacture
 To aid in the design process
 To reduce material costs and achieve lean manufacturing goals
 To ensure compliance with international and industry standards
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6. Basic Approach
 Step 1: Original shape and size
of the specimen with no load.
 Step 2: Specimen undergoing
uniform elongation.
 Step 3: Point of maximum
load and ultimate tensile
strength.
 Step 4: The onset of necking
(plastic instability).
 Step 5: Specimen fractures.
 Step 6: Final length.
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8. Factors Influencing Tensile Strength
The effect of additives and impurities
Temperature
Geometric size and shape
Orientation and Morphology
Surface Condition
Energy and speed of loading
The environment- Humidity.
Strains in the article due to external loads
Gauge Length
Jaw Slippage, deformation due to jaw pressure higher strain
at the neck of the specimen contribute to the error.
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9. Stress-strain graphs of two plastics
A rigid polymer at a temperature below Tg- High tensile strength but
less area under sress
strain graph
 An amorphous polymer greater than Tg –low tensile strength but
more area under stress strain curves 9

10. Effect of Additives
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12. References:
 The Effect of Tensile strength and Factors on Polymer.
 Effect of Tensile properties.
 Fundamentals of Material Science and Engineering
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Gulam Waris Sir Notes

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