Introduction to the characteristics of plastic raw materials

1. Plastic raw materials expand when heated, with a much larger coefficient of linear expansion than metals;

2. The stiffness of general plastic materials is one order of magnitude lower than that of metals;

3. The mechanical properties of plastic raw materials will significantly decrease under long-term heating;

4. Generally, plastic raw materials will undergo permanent deformation when subjected to long-term stress at room temperature and below their yield strength;

5. Plastic raw materials are sensitive to notch damage;

6. The mechanical properties of plastic raw materials are usually much lower than those of metals, but some composite materials have higher specific strength and specific modulus than metals. If the product design is reasonable, it will be more advantageous to play a role;

7. Generally, the mechanical properties of reinforced plastic raw materials are anisotropic;

8. Some plastic materials may absorb moisture and cause changes in size and performance;

9. Some plastics are flammable;

10. The fatigue data of plastic raw materials is still limited and needs to be considered according to usage requirements