Figure 3
Three labeled photographs are arranged in sections. The first section (a) on the left shows a tall vertical drop-weight tower composed of multiple vertical supports, a central guide, and a cylindrical component labeled “Impactor.” A diagonal structure is labeled “Pneumatic Arm.” A smaller labeled section near the center is marked “Optical sensor.” At the bottom, a flat platform is labeled “Rigid Fixture Base.” An inset at the lower left corner shows a cylindrical piece labeled “Impactor tip” with the handwritten number “47” on its surface. The second section (b) on the right side shows a rectangular T P U composite sheet with dimensions marked as “150 millimeters” vertically and “100 millimeters” horizontally, indicated by double-headed arrows. The text “L equals 2.5 millimeters” is written near the top of the sheet. Additional written text on the sheet includes “G 1 P 1” and “1 P U K 8.” A dashed circle highlights a portion of the sheet, leading to a zoomed inset at the right showing horizontal parallel lines. Below the inset is a ruler showing visible numbers “2,” “3,” and “4.” The third section (c) at the lower right side shows a metal assembly labeled “Circular fixture” at the center. Above the fixture, two labeled components are marked “Rubber clamps.” Levers and fasteners are visible around the fixture.(a) Drop-weight impact tower, (b) TPU composite specimen and (c) circular fixture