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YBB 00162003-2015: Test for Stress
YBB00162003-2015
YBB
Test for Stress
This Standard applies to the test for the stress of medicinal glass containers.
Usually, glass is an isotropic homogeneous material. When there is stress, it
will show anisotropy and produce light birefringence. This Standard specifies
the test of using a polarized light stress meter to measure the optical path
difference of birefringence, and using the numerical value of the optical path
difference of unit thickness to express the magnitude of stress of product.
Instruments and devices The polarized light stress meter shall conform to the
following technical requirements. When using polarized light elements and
protectors to observe, the brightness of the edge of the light field is not less
than 120 cd/m2. The polarization elements used shall ensure that the degree of
polarization at any point in the bright field is not less than 99%. The polarization
field is not less than 85 mm. Between the polarizer and the analyzer, a full-wave
plate (sensitive color plate) of 565 nm and a 1/4 wave plate can be inserted
respectively; and the slow axis of the wave plate is at 90° to the polarization
plane of the polarizer. The analyzer shall be installed to be able to rotate relative
to the polarizer and the full-wave plate or 1/4 wave plate; and shall be equipped
with the measuring equipment of rotation angle (The dial scale value is 1°).
Test method The sample for test shall be a product which has not been