The advantages of plastics as compared to ceramics, glasses and metals are to be stated. Concept Introduction: Plastics are materials which are synthesized from a variety of organic polymers like PVC, polyethylene, etc., which can be molded into different shapes while they are soft and then are set into a rigid or slightly elastic material. Ceramics are the materials that contains inorganic component of metals, non-metal or metalloid atoms which are held in ionic and covalent bonds. Glasses are non-crystalline material and an amorphous solid which is mostly transparent with widespread practical, technological, and decorative uses. Metals are materials which shows lustrous appearance when prepared fresh, polished, or fractured. They conduct electricity and heat very well and are malleable and ductile.

Question

1.3 (A). Define the terms shear stress and shear strain, illustrating your answer by means of a simple sketch. Two circular bars, one of brass and the other of steel, are to be loaded by a shear load of 30 kN. Determine the necessary diameter of the bars (a) in single shear, (b) in double shear, if the shear stress in the two materials must not exceed 50 MN/m2 and 100 MN/ mZ respectively. C27.6, 19.5, 19.5, 13.8mm.l 11

Answer 1

Question

Chapter 16, Problem 16.4P

Interpretation Introduction

Interpretation:

The advantages of plastics as compared to ceramics, glasses and metals are to be stated.

Concept Introduction:

Plastics are materials which are synthesized from a variety of organic polymers like PVC, polyethylene, etc., which can be molded into different shapes while they are soft and then are set into a rigid or slightly elastic material.

Ceramics are the materials that contains inorganic component of metals, non-metal or metalloid atoms which are held in ionic and covalent bonds.

Glasses are non-crystalline material and an amorphous solid which is mostly transparent with widespread practical, technological, and decorative uses.

Metals are materials which shows lustrous appearance when prepared fresh, polished, or fractured. They conduct electricity and heat very well and are malleable and ductile.

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