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engineering materials - Coursework Example
Finance & Accounting
Pages 3 (753 words)
Engineering Materials Q1. It is the brittle feature that holds together the atoms of a material. As reported in Standard (2005), it has been proved that ceramics are made up of either covalent or ionic bonds; sometime both these bonds are seen in ceramics…
As a result, the negative mobile electrons keep the positive ions close together and thereby make material harder to break. Q2. Glasses generally possess low tensile strength as they are amorphous solid. To illustrate, the molecules of the glass do not constitute any specific internal structure. These molecules are arranged disorderly and do not hold to one another very strongly. In addition, glass is very similar to a slowly moving liquid so that old pieces of glass seem thicker at the bottom than at the top. In order to increase the tensile strength of the glass, the molecules must keep very strong hold with one another. Surface finishing and ion-exchange are two chemical processes that are applied to strengthen glass materials (Chemically strengthened glass, 2011). Q3. The Giffith’s theory reflects the relationship between crack length at fracture and applied nominal stress. It is a comprehensive equation that can be effectively employed for engineering purposes. Giffith’s theory says that steel is a safer engineering material than glass. It is experimentally proved that the stress required to fracture a glass is nearly 100 MPa. It indicates that comparatively a smaller stress is enough to fracture a glass and therefore, this material is not advisable for engineering purposes. ...
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