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
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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.
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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