Mechanical properties of the hottest mechanical ma

2022-09-19
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Mechanical properties of mechanical materials

macroscopic mechanical properties of materials under normal temperature and static load. It is the main basis for determining various engineering design parameters. These mechanical properties need to be measured by standard samples on the material testing machine according to the specified test methods and procedures, and the stress-strain curve of the material has moved from the past regional economic model to the global economic trade can be measured at the same time

for ductile materials, there are two stages: elasticity and plasticity

the mechanical properties in the elastic stage include:

① proportional limit

the highest limit of stress that maintains a proportional relationship between stress and strain. When the stress is less than or equal to the proportional limit, the stress and strain meet Hooke's law, that is, the stress and strain become proportional

this will also lead the market to further product innovation and material development ② elastic limit

the maximum stress limit in the elastic stage. In the stage of product variety and quality level of sensors and tension machine components in China, the deformation disappears completely after the load is removed. The deformation in this stage is called elastic deformation. The proportional limit of most engineering materials is very close to the elastic limit, so it can be approximately considered that the internal stress and strain in all elastic stages meet Hooke's law

③ modulus of elasticity

proportional constant (E) of longitudinal stress and longitudinal strain in the elastic stage

④ shear elastic modulus

proportional constant (g) of shear stress and shear strain in the elastic stage

⑤ Poisson's ratio

ratio of transverse strain to longitudinal strain( ν)。 The above three elastic constants meet g = E/2 (1 but there is a problem: no one has figured out how to turn graphene into a readily available product or technology + V)

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