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Small coupon testing was performed to assess the selected joining processes.
The investigations are achieved on a small coupon and full scale specimens extracted from a COPV.
Laminates with more axial reinforcement had a clearly higher bearing stiffness for the small coupon width (w/D=2).
Items with applicable coupons are properly identified with a small coupon box right underneath the item price.
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Tests were first carried out on small-scale (coupon) specimens, in order to determine the most relevant material mechanical properties.
The joint ultimate loads could be accurately predicted based on stress concentration factors from FEA and FRP through-thickness tensile strength values obtained from small-scale coupon tests.
The evolution of material properties was also characterised by measuring local hardness and conducting tensile tests on small coupons that were extracted from the same welded specimens.
It is important to consider the effect of specimen size on strength when carrying out tests on composites, and to take account of it when using strength data from small coupons in the design of large structures.
With these coating and test conditions, there was no statistically-significant effect of substrate alloy on the average lifetime of the air plasma sprayed (APS) yttria-stabilized zirconia (YSZ) top coatings on small coupons.
Small-scale coupons obtained from both types of GFRP profiles were exposed to a Mediterranean range of thermal variations (−5 °C to 40 °C) for up to 190 cycles in a dry condition.
For the analysis of low-velocity impact, this work provides an analytic scaling approach, permitting to analyze structural impact scenarios on a small reference coupon.
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CEO of Professional Science Editing for Scientists @ prosciediting.com