To reduce thermal effects, a good match of coefficient of thermal expansion (CTE) of optics and flexure material is helpful. Most high-strength materials have low fracture toughness. This temperature cycling process was repeated 10 times over the duration of 62 hours, with deflection during peak temperature and shift after the end of each cycle recorded. Flexure toughness determines its resistance to fracture or cracking.
#BEST MATERIAL FOR FLEXTURE ISO#
to DIN 53121, ISO 5628 and DIN 19304, plastic films for example to DIN 53350 and coated textiles. Firstly, flexure hinges with concentrated and distributed compliance are reviewed. It is used to determine the bending stiffness (using the beam method) and bending resistance of paper, board, and cardboard, e.g. After a thermal soaking period to ensure the mount is sufficiently heated through, the mirror mount was returned to its original temperature, completing a cycle. The 2-point flexure test kit is suitable for testing of paper, cardboard, and films. Dont forget that the grain structure of the material will. Then, the mirror mount was subjected to a 10☌ increase in temperature for one hour through convection heating. My recommendation therefore is to bend in T4 condition and then heat treat to T6 if this is possible. After initial alignment adjustments, the mirror mount was left to rest for two hours to allow the internal kinematic forces to reach equilibrium. Our Application Engineers will work with you to choose the best material, incorporate your specific features and attachments, and design a HELI-CAL Flexure. Throughout the test, an independently thermally isolated CONEX-LDS Autocollimator was used to monitor the reflected beam position. Due to its low viscosity, 920 is also used.
This hydrophobic, super low viscosity polyurethane reacts with water and expands to form a closed cell, watertight, rigid foam. Upon fastening to the table, the mirror mount was set to nominal and zeroed to set the initial position. Prime Flex 920 is a single-component polyurethane injection resin used to seal gushing leaks, including wide gaps, in concrete where the structure is not subject to movement. This assembly was then placed inside of a climate-controlled environmental chamber and mounted to a stainless steel optical table. Newport's thermal drift testing of mirror mounts has two purposes: (1) to measure the maximum deflection during a peak temperature shift (after a soaking period) and (2) to measure the shift in position after temperature cycling and return to initial temperature.Ī mirror mount, with mirror installed, was securely fixed to a 1.5"-diameter solid steel pedestal post.
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