Other Factors Affecting Properties

In addition to temperature, there are several other factor that affect the impact toughness. One important factor is the machine itself. Each machine will absorb some energy when the specimen is struck by pendulum and this amount though very small will vary from machine to machine and thus the impact toughness will be affected. The notch root radius is starndarised and any deviation from it will influence the result. A sharper radius will tend to reduce the impact toughness while a coarser radius will increase the amount of energy absorbed during fracture.