Double-elastic modulus method when material load-deformation curve initial straight line segment is short
A technology of load deformation and elastic modulus, applied in the analysis of materials, measuring devices, strength characteristics, etc., can solve the problems of large deviation of force and deformation from actual value and low practical value.
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[0074] A kind of double elastic modulus method of the present invention when the initial straight section of material load-deformation curve is very short, this method comprises the following steps:
[0075] (1) After determining the two ends of the initial straight line segment, the elastic modulus E, and the proportional elongation force P p and the scale limit σ p After that; for brittle materials, determine the breaking force P b , for a plastic material in the non-yielding stage, the non-proportional elongation force P is determined p0.2 , referred to as P 0.2 ;
[0076] (2) Find a point P on the curve C , for brittle materials, 0.5P b ≤P c ≤0.55P b , for a plastic material with no yield stage, 0.5P 0.2 ≤P c ≤0.55P 0.2 ;
[0077] (3) Satisfy the condition discriminant P P C The test curve of the initial straight line is considered to be very short, and a supplementary straight line needs to be drawn. The starting point of the supplementary straight line is the...
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