Q_Give reason(s) for the following: 1_in tensile test of plastic materials the drawn material is much stronger than the original undrawn plastic material. 2- In load-extension curves that are obtained for many plastic materials, it would be very difficult or impossible to obtain a value for young's modulus 3- When a sample of hard material is subjected to three points bending test, the fracture commences at Lower surface.
Q_Give reason(s) for the following: 1_in tensile test of plastic materials the drawn material is much stronger than the original undrawn plastic material. 2- In load-extension curves that are obtained for many plastic materials, it would be very difficult or impossible to obtain a value for young's modulus 3- When a sample of hard material is subjected to three points bending test, the fracture commences at Lower surface.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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![Q Give reason(s) for the following:
1_in tensile test of plastic materials the drawn material is much stronger than
the original undrawn plastic material.
2- In load-extension curves that are obtained for many plastic materials, it
would be very difficult or impossible to obtain a value for young's modulus
3- When a sample of hard material is subjected to three points bending test,
the fracture commences at Lower surface.
4_In compression testing, test-pieces have to be short and the length not be
greater than three times the diameter.
5_In compression test, once plastic deformation occurs the material tends to
deform into a barrel shape
6- In compression test, the shape of plastic portion of stress-strain curve is
different from its tensile test complement in that higher values of engineering
stress are calculated.
7_In cup drawing tests, some drawn cups possess ears
8_We could not use results of tensile tests to predict impact failure behavior.
9- Small test pieces are not recommended for tensile test.
10- It is recommended not to make more than one dynamic hardness test on
the same point on the surface.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F48ea51b2-a0d1-4b1e-ba80-3a9bba32615a%2F287a34e8-3229-4589-8c85-2d4e9aaa8c42%2Fcjv5m5i_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q Give reason(s) for the following:
1_in tensile test of plastic materials the drawn material is much stronger than
the original undrawn plastic material.
2- In load-extension curves that are obtained for many plastic materials, it
would be very difficult or impossible to obtain a value for young's modulus
3- When a sample of hard material is subjected to three points bending test,
the fracture commences at Lower surface.
4_In compression testing, test-pieces have to be short and the length not be
greater than three times the diameter.
5_In compression test, once plastic deformation occurs the material tends to
deform into a barrel shape
6- In compression test, the shape of plastic portion of stress-strain curve is
different from its tensile test complement in that higher values of engineering
stress are calculated.
7_In cup drawing tests, some drawn cups possess ears
8_We could not use results of tensile tests to predict impact failure behavior.
9- Small test pieces are not recommended for tensile test.
10- It is recommended not to make more than one dynamic hardness test on
the same point on the surface.
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