Elastic modulus of steel, average linear expansion coefficient
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I would like to ask the teachers: On page P84 of GB150.2, the unit for elastic modulus is E/10m3Mpa. Can this be understood as the elastic modulus of austenite at 20 degrees Celsius being 195/10m3Mpa = 0.195Mpa per square meter? How should the unit of the coefficient of expansion, α/（10 to the power of -6 mm/mm·°C）， be understood?
The linear expansion coefficient: by multiplying the length of the metal by the temperature increase and then by this expansion coefficient, the increase in the metal’s size can be determined; in other words, it refers to the phenomenon of expansion when heated and contraction when cooled
For austenite, at 100 degrees, is it 15.84×0.000001 mm·degree Celsius × length?
I would like to ask, why is it necessary to multiply by 1000 in addition to 103?
Temperature rise! The difference in temperature after heating compared to the original value
For example, a shaft made of 304 material has a length of 1000 mm at 20 degrees Celsius. When it is heated evenly to 120 degrees Celsius, the increase in its length is 1000*100*15.8/1000000 = 1.58 mm, so the total length becomes 1001.58 mm
He meant that the numbers in the table are divided by 1000; when applying the formula, you need to multiply by 1000, which gives 195000 MPa