Why we 3D-print defects
Defects are hard to learn on real parts because carbon is black on black: a tow on the laminate has almost no contrast. The book's answer is physical models: a curved tool, five oversized tows, one defect, printed in three colours (white tool, black tows, red defect). Then the chapter closes: the five lenses serve four people (designer, planner, operator, inspector), and models plus knowledge of defect effects build real inspection and rework skill.
Predict · at 0:42 in the video
How much contrast is there between a black tow and the black laminate under it, compared with black text on white paper?
Almost none. On screen, black on black comes out at about one point two to one. That's the standard contrast ratio: the brightness of the lighter colour over the darker, with a small offset so pure black doesn't divide by zero.
Automated Fiber Placement: Status, Challenges, and Evolution, Ramy Harik & Alex Brasington.
- Chapter 3, section 3
- Chapter 3, section 3.1
- Chapter 3, section 3.2
- Chapter 3, section 3.3
Simulations in this lesson are our own. Where the numbers are invented to show a mechanism, the video says so on screen.
