Explanation

A materials constant is the materials under the action of uniformly distributed axial stress. For isotropic materials, there is a relationship between tensile modulus E, shear modulus G, Poisson's ratio and bulk modulus B. This value is a constant in the limit range of elastic deformation ratio of materials. When it exceeds this range, this value changes with the average stress and the stress range used, and is no longer called Poisson's ratio. For anisotropic materials, there are multiple Poisson's ratios. In addition to industrial, instrument and military applications, permanence luminescent materials can be applied in civilian applications, such as light switches, plugs, telephone number plates, keyholes, door handles, stair steps, door plates, theater seat numbers, etc. It can also be used as a special sign, such as entrance protection engineering, emergency exit, fire alarm, ship lifebuoy, mining passage, mining tail sign, etc.

Classification